./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU --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 4d5c55d9a4a2ded389ff7ce077afdc88fb2d2855921e5fd1e3b93fbba7e140e8 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-02 22:53:04,431 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-02 22:53:04,434 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-02 22:53:04,485 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-02 22:53:04,485 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-02 22:53:04,487 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-02 22:53:04,489 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-02 22:53:04,491 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-02 22:53:04,494 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-02 22:53:04,495 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-02 22:53:04,496 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-02 22:53:04,498 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-02 22:53:04,498 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-02 22:53:04,500 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-02 22:53:04,502 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-02 22:53:04,504 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-02 22:53:04,505 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-02 22:53:04,506 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-02 22:53:04,509 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-02 22:53:04,512 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-02 22:53:04,515 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-02 22:53:04,516 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-02 22:53:04,518 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-02 22:53:04,519 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-02 22:53:04,523 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-02 22:53:04,524 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-02 22:53:04,524 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-02 22:53:04,526 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-02 22:53:04,526 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-02 22:53:04,528 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-02 22:53:04,528 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-02 22:53:04,529 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-02 22:53:04,530 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-02 22:53:04,531 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-02 22:53:04,533 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-02 22:53:04,533 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-02 22:53:04,534 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-02 22:53:04,535 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-02 22:53:04,535 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-02 22:53:04,536 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-02 22:53:04,537 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-02 22:53:04,538 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-11-02 22:53:04,562 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-02 22:53:04,563 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-02 22:53:04,563 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-02 22:53:04,563 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-02 22:53:04,565 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-02 22:53:04,565 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-02 22:53:04,565 INFO L138 SettingsManager]: * Use SBE=true [2021-11-02 22:53:04,566 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-02 22:53:04,566 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-02 22:53:04,566 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-02 22:53:04,566 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-02 22:53:04,567 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-02 22:53:04,567 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-02 22:53:04,567 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-02 22:53:04,567 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-02 22:53:04,568 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-02 22:53:04,568 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-02 22:53:04,568 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-02 22:53:04,568 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-02 22:53:04,568 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-02 22:53:04,569 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-02 22:53:04,569 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-02 22:53:04,569 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-02 22:53:04,570 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:53:04,570 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-02 22:53:04,570 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-02 22:53:04,570 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-02 22:53:04,571 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-02 22:53:04,571 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-02 22:53:04,571 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_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4d5c55d9a4a2ded389ff7ce077afdc88fb2d2855921e5fd1e3b93fbba7e140e8 [2021-11-02 22:53:04,815 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-02 22:53:04,848 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-02 22:53:04,851 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-02 22:53:04,857 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-02 22:53:04,859 INFO L275 PluginConnector]: CDTParser initialized [2021-11-02 22:53:04,859 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/../../sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i [2021-11-02 22:53:04,972 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/data/3d9989906/6eafc50758974943b3a895dccc6a287a/FLAGcd193ac91 [2021-11-02 22:53:05,463 INFO L306 CDTParser]: Found 1 translation units. [2021-11-02 22:53:05,464 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i [2021-11-02 22:53:05,490 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/data/3d9989906/6eafc50758974943b3a895dccc6a287a/FLAGcd193ac91 [2021-11-02 22:53:05,903 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/data/3d9989906/6eafc50758974943b3a895dccc6a287a [2021-11-02 22:53:05,905 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-02 22:53:05,906 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-02 22:53:05,922 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-02 22:53:05,922 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-02 22:53:05,926 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-02 22:53:05,929 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:53:05" (1/1) ... [2021-11-02 22:53:05,930 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@31c99d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:53:05, skipping insertion in model container [2021-11-02 22:53:05,930 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:53:05" (1/1) ... [2021-11-02 22:53:05,937 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-02 22:53:05,986 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-02 22:53:06,305 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_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i[24275,24288] [2021-11-02 22:53:06,307 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:53:06,315 INFO L203 MainTranslator]: Completed pre-run [2021-11-02 22:53:06,354 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_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i[24275,24288] [2021-11-02 22:53:06,355 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:53:06,386 INFO L208 MainTranslator]: Completed translation [2021-11-02 22:53:06,386 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:53:06 WrapperNode [2021-11-02 22:53:06,387 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-02 22:53:06,388 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-02 22:53:06,388 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-02 22:53:06,388 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-02 22:53:06,399 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:53:06" (1/1) ... [2021-11-02 22:53:06,400 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:53:06" (1/1) ... [2021-11-02 22:53:06,414 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:53:06" (1/1) ... [2021-11-02 22:53:06,414 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:53:06" (1/1) ... [2021-11-02 22:53:06,433 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:53:06" (1/1) ... [2021-11-02 22:53:06,438 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:53:06" (1/1) ... [2021-11-02 22:53:06,442 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:53:06" (1/1) ... [2021-11-02 22:53:06,448 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-02 22:53:06,449 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-02 22:53:06,450 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-02 22:53:06,450 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-02 22:53:06,451 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:53:06" (1/1) ... [2021-11-02 22:53:06,458 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:53:06,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:06,483 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-02 22:53:06,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-02 22:53:06,542 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-02 22:53:06,542 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-02 22:53:06,542 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-11-02 22:53:06,543 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-02 22:53:06,543 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-02 22:53:06,544 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2021-11-02 22:53:06,544 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-11-02 22:53:06,544 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_create [2021-11-02 22:53:06,544 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_remove_last [2021-11-02 22:53:06,545 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-02 22:53:06,545 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-02 22:53:06,545 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-11-02 22:53:06,546 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-11-02 22:53:06,546 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-11-02 22:53:06,546 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-11-02 22:53:06,546 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-02 22:53:06,546 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-02 22:53:06,546 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-02 22:53:06,547 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-02 22:53:06,547 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-02 22:53:06,547 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-02 22:53:06,547 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-02 22:53:06,547 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-02 22:53:06,547 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-02 22:53:06,548 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-02 22:53:06,548 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-02 22:53:06,548 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-02 22:53:06,548 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-02 22:53:06,548 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-02 22:53:06,548 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-02 22:53:06,549 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-02 22:53:06,549 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-02 22:53:06,549 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-02 22:53:06,549 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-02 22:53:06,549 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-02 22:53:06,549 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-02 22:53:06,550 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-02 22:53:06,550 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-02 22:53:06,550 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-02 22:53:06,550 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-02 22:53:06,550 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-02 22:53:06,550 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-02 22:53:06,551 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-02 22:53:06,551 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-02 22:53:06,551 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-02 22:53:06,551 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-02 22:53:06,552 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-02 22:53:06,552 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-02 22:53:06,553 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-02 22:53:06,553 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-02 22:53:06,553 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-02 22:53:06,553 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-02 22:53:06,553 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-02 22:53:06,554 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-02 22:53:06,554 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-02 22:53:06,554 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-02 22:53:06,554 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-02 22:53:06,554 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-02 22:53:06,555 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-02 22:53:06,555 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-02 22:53:06,555 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-02 22:53:06,555 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-02 22:53:06,555 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-02 22:53:06,556 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-02 22:53:06,556 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-02 22:53:06,556 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-02 22:53:06,557 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-02 22:53:06,557 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-02 22:53:06,558 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-02 22:53:06,558 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-02 22:53:06,558 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-02 22:53:06,559 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-02 22:53:06,559 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2021-11-02 22:53:06,559 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-02 22:53:06,559 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-02 22:53:06,559 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-02 22:53:06,560 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-11-02 22:53:06,560 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-02 22:53:06,560 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-11-02 22:53:06,560 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-02 22:53:06,560 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-02 22:53:06,560 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-11-02 22:53:06,561 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-02 22:53:06,561 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-02 22:53:06,562 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-02 22:53:06,562 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-02 22:53:06,562 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-02 22:53:06,562 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-02 22:53:06,562 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-02 22:53:06,562 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-02 22:53:06,563 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-02 22:53:06,563 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-02 22:53:06,563 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-02 22:53:06,563 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-02 22:53:06,563 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-02 22:53:06,563 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-02 22:53:06,563 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-02 22:53:06,564 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-02 22:53:06,564 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-02 22:53:06,564 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-02 22:53:06,564 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-02 22:53:06,564 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-02 22:53:06,564 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-02 22:53:06,565 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-02 22:53:06,565 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-02 22:53:06,565 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-02 22:53:06,565 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-02 22:53:06,566 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-02 22:53:06,566 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-02 22:53:06,567 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-02 22:53:06,567 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-02 22:53:06,567 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-02 22:53:06,567 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-02 22:53:06,567 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-02 22:53:06,567 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-02 22:53:06,567 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-02 22:53:06,568 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-02 22:53:06,568 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-02 22:53:06,568 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-02 22:53:06,568 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-02 22:53:06,568 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2021-11-02 22:53:06,569 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-11-02 22:53:06,569 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-02 22:53:06,569 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-02 22:53:06,569 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-02 22:53:06,570 INFO L130 BoogieDeclarations]: Found specification of procedure dll_create [2021-11-02 22:53:06,570 INFO L130 BoogieDeclarations]: Found specification of procedure dll_remove_last [2021-11-02 22:53:06,571 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-02 22:53:06,573 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-02 22:53:06,574 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-02 22:53:06,574 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-02 22:53:06,575 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-02 22:53:06,577 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-02 22:53:06,577 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-02 22:53:06,577 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-02 22:53:06,930 INFO L758 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2021-11-02 22:53:07,223 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-02 22:53:07,224 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-02 22:53:07,226 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:53:07 BoogieIcfgContainer [2021-11-02 22:53:07,226 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-02 22:53:07,228 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-02 22:53:07,228 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-02 22:53:07,231 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-02 22:53:07,231 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 10:53:05" (1/3) ... [2021-11-02 22:53:07,232 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19bb6e68 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:53:07, skipping insertion in model container [2021-11-02 22:53:07,232 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:53:06" (2/3) ... [2021-11-02 22:53:07,233 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19bb6e68 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:53:07, skipping insertion in model container [2021-11-02 22:53:07,233 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:53:07" (3/3) ... [2021-11-02 22:53:07,234 INFO L111 eAbstractionObserver]: Analyzing ICFG dll2n_remove_all_reverse.i [2021-11-02 22:53:07,240 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-02 22:53:07,240 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 40 error locations. [2021-11-02 22:53:07,284 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-02 22:53:07,290 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 [2021-11-02 22:53:07,291 INFO L340 AbstractCegarLoop]: Starting to check reachability of 40 error locations. [2021-11-02 22:53:07,307 INFO L276 IsEmpty]: Start isEmpty. Operand has 88 states, 44 states have (on average 2.0) internal successors, (88), 78 states have internal predecessors, (88), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:53:07,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-02 22:53:07,314 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:07,315 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:07,315 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting dll_createErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:07,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:07,320 INFO L85 PathProgramCache]: Analyzing trace with hash -961704470, now seen corresponding path program 1 times [2021-11-02 22:53:07,329 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:07,330 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933023089] [2021-11-02 22:53:07,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:07,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:07,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:07,605 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:07,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:07,625 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:07,626 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:07,626 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933023089] [2021-11-02 22:53:07,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [933023089] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:53:07,627 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:53:07,627 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:53:07,629 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22223870] [2021-11-02 22:53:07,634 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:53:07,634 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:07,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:53:07,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:53:07,651 INFO L87 Difference]: Start difference. First operand has 88 states, 44 states have (on average 2.0) internal successors, (88), 78 states have internal predecessors, (88), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) 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, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:53:07,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:07,893 INFO L93 Difference]: Finished difference Result 89 states and 95 transitions. [2021-11-02 22:53:07,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:53:07,895 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, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-11-02 22:53:07,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:07,906 INFO L225 Difference]: With dead ends: 89 [2021-11-02 22:53:07,906 INFO L226 Difference]: Without dead ends: 83 [2021-11-02 22:53:07,910 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 [2021-11-02 22:53:07,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-02 22:53:07,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 79. [2021-11-02 22:53:07,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 41 states have (on average 1.853658536585366) internal successors, (76), 71 states have internal predecessors, (76), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:53:07,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 83 transitions. [2021-11-02 22:53:07,961 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 83 transitions. Word has length 11 [2021-11-02 22:53:07,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:07,962 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 83 transitions. [2021-11-02 22:53:07,962 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, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:53:07,962 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 83 transitions. [2021-11-02 22:53:07,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-02 22:53:07,963 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:07,963 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:07,964 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-02 22:53:07,964 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting dll_createErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:07,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:07,966 INFO L85 PathProgramCache]: Analyzing trace with hash -961704469, now seen corresponding path program 1 times [2021-11-02 22:53:07,967 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:07,967 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136663220] [2021-11-02 22:53:07,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:07,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:08,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:08,088 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:08,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:08,115 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:08,115 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:08,116 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136663220] [2021-11-02 22:53:08,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136663220] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:53:08,116 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:53:08,116 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:53:08,117 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441119225] [2021-11-02 22:53:08,118 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:53:08,127 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:08,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:53:08,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:53:08,129 INFO L87 Difference]: Start difference. First operand 79 states and 83 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, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:53:08,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:08,315 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2021-11-02 22:53:08,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:53:08,316 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, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-11-02 22:53:08,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:08,319 INFO L225 Difference]: With dead ends: 80 [2021-11-02 22:53:08,320 INFO L226 Difference]: Without dead ends: 80 [2021-11-02 22:53:08,321 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 [2021-11-02 22:53:08,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-02 22:53:08,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 76. [2021-11-02 22:53:08,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 68 states have internal predecessors, (73), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:53:08,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2021-11-02 22:53:08,345 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 11 [2021-11-02 22:53:08,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:08,347 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2021-11-02 22:53:08,347 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, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:53:08,347 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2021-11-02 22:53:08,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-02 22:53:08,348 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:08,349 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:08,349 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-02 22:53:08,349 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:08,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:08,350 INFO L85 PathProgramCache]: Analyzing trace with hash 950899493, now seen corresponding path program 1 times [2021-11-02 22:53:08,351 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:08,351 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [76915346] [2021-11-02 22:53:08,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:08,352 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:08,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:08,462 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:08,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:08,496 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:08,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:08,540 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:08,541 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:08,541 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [76915346] [2021-11-02 22:53:08,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [76915346] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:53:08,541 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:53:08,541 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:53:08,542 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525451239] [2021-11-02 22:53:08,542 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:53:08,542 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:08,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:53:08,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:53:08,543 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:53:08,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:08,842 INFO L93 Difference]: Finished difference Result 89 states and 94 transitions. [2021-11-02 22:53:08,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:53:08,843 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 15 [2021-11-02 22:53:08,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:08,846 INFO L225 Difference]: With dead ends: 89 [2021-11-02 22:53:08,846 INFO L226 Difference]: Without dead ends: 86 [2021-11-02 22:53:08,846 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:53:08,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-02 22:53:08,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 77. [2021-11-02 22:53:08,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 42 states have (on average 1.7619047619047619) internal successors, (74), 69 states have internal predecessors, (74), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:53:08,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 81 transitions. [2021-11-02 22:53:08,858 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 81 transitions. Word has length 15 [2021-11-02 22:53:08,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:08,858 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 81 transitions. [2021-11-02 22:53:08,859 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:53:08,859 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 81 transitions. [2021-11-02 22:53:08,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-02 22:53:08,860 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:08,860 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:08,860 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-02 22:53:08,860 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting dll_createErr6REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:08,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:08,861 INFO L85 PathProgramCache]: Analyzing trace with hash 2016813486, now seen corresponding path program 1 times [2021-11-02 22:53:08,861 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:08,861 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [309878891] [2021-11-02 22:53:08,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:08,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:08,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:09,007 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:09,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:09,023 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:09,023 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:09,023 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [309878891] [2021-11-02 22:53:09,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [309878891] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:53:09,024 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:53:09,024 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:53:09,024 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222631216] [2021-11-02 22:53:09,024 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:53:09,025 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:09,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:53:09,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:53:09,026 INFO L87 Difference]: Start difference. First operand 77 states and 81 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:53:09,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:09,181 INFO L93 Difference]: Finished difference Result 83 states and 87 transitions. [2021-11-02 22:53:09,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:53:09,184 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-11-02 22:53:09,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:09,187 INFO L225 Difference]: With dead ends: 83 [2021-11-02 22:53:09,187 INFO L226 Difference]: Without dead ends: 83 [2021-11-02 22:53:09,188 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:53:09,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-02 22:53:09,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2021-11-02 22:53:09,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 47 states have (on average 1.6808510638297873) internal successors, (79), 74 states have internal predecessors, (79), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:53:09,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 86 transitions. [2021-11-02 22:53:09,200 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 86 transitions. Word has length 15 [2021-11-02 22:53:09,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:09,201 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 86 transitions. [2021-11-02 22:53:09,201 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:53:09,201 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 86 transitions. [2021-11-02 22:53:09,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-02 22:53:09,202 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:09,202 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, 1, 1] [2021-11-02 22:53:09,202 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-02 22:53:09,202 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:09,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:09,203 INFO L85 PathProgramCache]: Analyzing trace with hash -1092107051, now seen corresponding path program 1 times [2021-11-02 22:53:09,203 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:09,203 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1828807060] [2021-11-02 22:53:09,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:09,204 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:09,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:09,276 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:09,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:09,303 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:09,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:09,359 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:09,359 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:09,359 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1828807060] [2021-11-02 22:53:09,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1828807060] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:09,360 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1356477716] [2021-11-02 22:53:09,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:09,360 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:09,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:09,362 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:09,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-02 22:53:09,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:09,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-02 22:53:09,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:09,671 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:09,672 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1356477716] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:09,672 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:53:09,672 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 10 [2021-11-02 22:53:09,673 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507463942] [2021-11-02 22:53:09,673 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:53:09,674 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:09,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:53:09,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:53:09,675 INFO L87 Difference]: Start difference. First operand 82 states and 86 transitions. Second operand has 10 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:53:09,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:09,995 INFO L93 Difference]: Finished difference Result 96 states and 101 transitions. [2021-11-02 22:53:09,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:53:09,995 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2021-11-02 22:53:09,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:09,996 INFO L225 Difference]: With dead ends: 96 [2021-11-02 22:53:09,996 INFO L226 Difference]: Without dead ends: 93 [2021-11-02 22:53:09,997 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:53:09,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-02 22:53:10,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 84. [2021-11-02 22:53:10,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 49 states have (on average 1.653061224489796) internal successors, (81), 76 states have internal predecessors, (81), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:53:10,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 88 transitions. [2021-11-02 22:53:10,002 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 88 transitions. Word has length 22 [2021-11-02 22:53:10,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:10,002 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 88 transitions. [2021-11-02 22:53:10,005 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:53:10,007 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 88 transitions. [2021-11-02 22:53:10,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-02 22:53:10,007 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:10,007 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:10,046 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:10,230 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:10,230 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting dll_createErr6REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:10,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:10,231 INFO L85 PathProgramCache]: Analyzing trace with hash -26193058, now seen corresponding path program 1 times [2021-11-02 22:53:10,231 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:10,231 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1984612329] [2021-11-02 22:53:10,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:10,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:10,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:10,359 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:10,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:10,368 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:10,368 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:10,369 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1984612329] [2021-11-02 22:53:10,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1984612329] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:10,369 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [517894399] [2021-11-02 22:53:10,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:10,369 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:10,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:10,378 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:10,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-02 22:53:10,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:10,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-02 22:53:10,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:10,585 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 [2021-11-02 22:53:10,657 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-02 22:53:10,659 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 [2021-11-02 22:53:10,839 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:10,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [517894399] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:10,840 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:53:10,840 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-11-02 22:53:10,840 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978205043] [2021-11-02 22:53:10,841 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:53:10,841 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:10,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:53:10,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:53:10,843 INFO L87 Difference]: Start difference. First operand 84 states and 88 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 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) [2021-11-02 22:53:11,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:11,039 INFO L93 Difference]: Finished difference Result 83 states and 87 transitions. [2021-11-02 22:53:11,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:53:11,040 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 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 22 [2021-11-02 22:53:11,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:11,041 INFO L225 Difference]: With dead ends: 83 [2021-11-02 22:53:11,041 INFO L226 Difference]: Without dead ends: 83 [2021-11-02 22:53:11,041 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:53:11,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-02 22:53:11,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-11-02 22:53:11,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 49 states have (on average 1.6326530612244898) internal successors, (80), 75 states have internal predecessors, (80), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:53:11,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 87 transitions. [2021-11-02 22:53:11,046 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 87 transitions. Word has length 22 [2021-11-02 22:53:11,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:11,046 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 87 transitions. [2021-11-02 22:53:11,047 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 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) [2021-11-02 22:53:11,047 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 87 transitions. [2021-11-02 22:53:11,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-02 22:53:11,047 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:11,048 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:11,092 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:11,274 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-02 22:53:11,274 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting dll_createErr7REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:11,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:11,274 INFO L85 PathProgramCache]: Analyzing trace with hash -26193057, now seen corresponding path program 1 times [2021-11-02 22:53:11,275 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:11,275 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1318939823] [2021-11-02 22:53:11,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:11,275 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:11,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:11,398 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:11,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:11,407 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:11,408 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:11,408 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1318939823] [2021-11-02 22:53:11,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1318939823] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:11,408 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [19916695] [2021-11-02 22:53:11,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:11,408 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:11,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:11,409 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:11,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-02 22:53:11,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:11,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-02 22:53:11,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:11,571 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 [2021-11-02 22:53:11,692 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:53:11,692 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 [2021-11-02 22:53:11,700 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-02 22:53:11,700 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 [2021-11-02 22:53:11,814 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:11,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [19916695] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:11,814 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:53:11,815 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2021-11-02 22:53:11,815 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294035325] [2021-11-02 22:53:11,815 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:53:11,815 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:11,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:53:11,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:53:11,816 INFO L87 Difference]: Start difference. First operand 83 states and 87 transitions. Second operand has 9 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 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) [2021-11-02 22:53:12,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:12,177 INFO L93 Difference]: Finished difference Result 82 states and 86 transitions. [2021-11-02 22:53:12,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:53:12,177 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 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 22 [2021-11-02 22:53:12,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:12,178 INFO L225 Difference]: With dead ends: 82 [2021-11-02 22:53:12,178 INFO L226 Difference]: Without dead ends: 82 [2021-11-02 22:53:12,179 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:53:12,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-02 22:53:12,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-11-02 22:53:12,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 49 states have (on average 1.6122448979591837) internal successors, (79), 74 states have internal predecessors, (79), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:53:12,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 86 transitions. [2021-11-02 22:53:12,184 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 86 transitions. Word has length 22 [2021-11-02 22:53:12,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:12,184 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 86 transitions. [2021-11-02 22:53:12,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 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) [2021-11-02 22:53:12,185 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 86 transitions. [2021-11-02 22:53:12,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-02 22:53:12,186 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:12,186 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] [2021-11-02 22:53:12,214 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:12,398 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-02 22:53:12,398 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:12,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:12,398 INFO L85 PathProgramCache]: Analyzing trace with hash 668159269, now seen corresponding path program 2 times [2021-11-02 22:53:12,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:12,399 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582895761] [2021-11-02 22:53:12,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:12,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:12,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:12,464 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:12,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:12,477 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:12,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:12,523 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:12,524 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:12,526 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [582895761] [2021-11-02 22:53:12,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [582895761] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:12,528 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1894964140] [2021-11-02 22:53:12,528 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:53:12,528 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:12,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:12,529 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:12,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-02 22:53:12,679 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-02 22:53:12,679 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:53:12,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-02 22:53:12,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:12,769 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-02 22:53:12,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1894964140] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:53:12,769 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:53:12,769 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-02 22:53:12,770 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389628965] [2021-11-02 22:53:12,770 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:53:12,770 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:12,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:53:12,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:53:12,771 INFO L87 Difference]: Start difference. First operand 82 states and 86 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:53:12,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:12,788 INFO L93 Difference]: Finished difference Result 85 states and 90 transitions. [2021-11-02 22:53:12,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:53:12,788 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2021-11-02 22:53:12,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:12,790 INFO L225 Difference]: With dead ends: 85 [2021-11-02 22:53:12,790 INFO L226 Difference]: Without dead ends: 85 [2021-11-02 22:53:12,791 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:53:12,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-02 22:53:12,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2021-11-02 22:53:12,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 50 states have (on average 1.6) internal successors, (80), 75 states have internal predecessors, (80), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:53:12,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 87 transitions. [2021-11-02 22:53:12,798 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 87 transitions. Word has length 29 [2021-11-02 22:53:12,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:12,799 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 87 transitions. [2021-11-02 22:53:12,799 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:53:12,799 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 87 transitions. [2021-11-02 22:53:12,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-02 22:53:12,800 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:12,800 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] [2021-11-02 22:53:12,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:13,026 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:13,026 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting dll_remove_lastErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:13,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:13,026 INFO L85 PathProgramCache]: Analyzing trace with hash -2143918591, now seen corresponding path program 1 times [2021-11-02 22:53:13,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:13,026 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320267128] [2021-11-02 22:53:13,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:13,027 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:13,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:13,066 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:13,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:13,082 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:13,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:13,116 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:13,117 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:13,117 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320267128] [2021-11-02 22:53:13,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [320267128] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:13,117 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1872280759] [2021-11-02 22:53:13,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:13,118 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:13,118 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:13,122 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:13,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-02 22:53:13,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:13,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-02 22:53:13,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:13,380 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:13,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1872280759] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:13,380 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:53:13,381 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4] total 6 [2021-11-02 22:53:13,383 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437104292] [2021-11-02 22:53:13,385 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:53:13,385 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:13,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:53:13,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-02 22:53:13,386 INFO L87 Difference]: Start difference. First operand 83 states and 87 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:13,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:13,582 INFO L93 Difference]: Finished difference Result 83 states and 86 transitions. [2021-11-02 22:53:13,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:53:13,582 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 31 [2021-11-02 22:53:13,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:13,583 INFO L225 Difference]: With dead ends: 83 [2021-11-02 22:53:13,583 INFO L226 Difference]: Without dead ends: 83 [2021-11-02 22:53:13,583 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:53:13,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-02 22:53:13,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-11-02 22:53:13,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 50 states have (on average 1.58) internal successors, (79), 75 states have internal predecessors, (79), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:53:13,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2021-11-02 22:53:13,588 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 31 [2021-11-02 22:53:13,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:13,588 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2021-11-02 22:53:13,588 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:13,588 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2021-11-02 22:53:13,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-02 22:53:13,589 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:13,589 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-02 22:53:13,619 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:13,795 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:13,796 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting dll_remove_lastErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:13,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:13,796 INFO L85 PathProgramCache]: Analyzing trace with hash -1187913315, now seen corresponding path program 1 times [2021-11-02 22:53:13,796 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:13,796 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831536989] [2021-11-02 22:53:13,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:13,797 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:13,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:13,864 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:13,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:13,881 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:13,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:14,155 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:14,156 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:14,156 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831536989] [2021-11-02 22:53:14,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [831536989] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:14,156 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1426661909] [2021-11-02 22:53:14,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:14,156 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:14,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:14,157 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:14,184 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-02 22:53:14,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:14,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-02 22:53:14,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:14,373 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 [2021-11-02 22:53:14,400 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 [2021-11-02 22:53:14,743 INFO L354 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2021-11-02 22:53:14,743 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 20 treesize of output 24 [2021-11-02 22:53:14,926 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:14,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1426661909] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:14,927 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:53:14,927 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 18 [2021-11-02 22:53:14,927 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915766128] [2021-11-02 22:53:14,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-02 22:53:14,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:14,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-02 22:53:14,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:53:14,929 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand has 19 states, 17 states have (on average 3.0) internal successors, (51), 15 states have internal predecessors, (51), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:53:16,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:16,166 INFO L93 Difference]: Finished difference Result 132 states and 140 transitions. [2021-11-02 22:53:16,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-02 22:53:16,167 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 3.0) internal successors, (51), 15 states have internal predecessors, (51), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 32 [2021-11-02 22:53:16,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:16,168 INFO L225 Difference]: With dead ends: 132 [2021-11-02 22:53:16,168 INFO L226 Difference]: Without dead ends: 132 [2021-11-02 22:53:16,169 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=155, Invalid=657, Unknown=0, NotChecked=0, Total=812 [2021-11-02 22:53:16,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-02 22:53:16,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 97. [2021-11-02 22:53:16,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 64 states have (on average 1.453125) internal successors, (93), 87 states have internal predecessors, (93), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 22:53:16,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 103 transitions. [2021-11-02 22:53:16,174 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 103 transitions. Word has length 32 [2021-11-02 22:53:16,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:16,175 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 103 transitions. [2021-11-02 22:53:16,175 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 3.0) internal successors, (51), 15 states have internal predecessors, (51), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:53:16,175 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 103 transitions. [2021-11-02 22:53:16,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-02 22:53:16,176 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:16,176 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-02 22:53:16,212 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:16,376 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:16,377 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting dll_remove_lastErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:16,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:16,377 INFO L85 PathProgramCache]: Analyzing trace with hash -1187913314, now seen corresponding path program 1 times [2021-11-02 22:53:16,377 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:16,377 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [766086661] [2021-11-02 22:53:16,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:16,378 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:16,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:16,519 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:16,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:16,540 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:16,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:16,796 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:16,796 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:16,797 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [766086661] [2021-11-02 22:53:16,797 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [766086661] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:16,797 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1479599565] [2021-11-02 22:53:16,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:16,797 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:16,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:16,802 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:16,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-02 22:53:16,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:16,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-02 22:53:16,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:17,017 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 [2021-11-02 22:53:17,032 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 [2021-11-02 22:53:17,486 INFO L354 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2021-11-02 22:53:17,487 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 29 [2021-11-02 22:53:17,657 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:17,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1479599565] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:17,657 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:53:17,657 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 17 [2021-11-02 22:53:17,658 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887849070] [2021-11-02 22:53:17,659 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-02 22:53:17,659 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:17,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-02 22:53:17,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:53:17,660 INFO L87 Difference]: Start difference. First operand 97 states and 103 transitions. Second operand has 18 states, 16 states have (on average 3.125) internal successors, (50), 14 states have internal predecessors, (50), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:53:18,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:18,650 INFO L93 Difference]: Finished difference Result 142 states and 150 transitions. [2021-11-02 22:53:18,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 22:53:18,650 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 3.125) internal successors, (50), 14 states have internal predecessors, (50), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 32 [2021-11-02 22:53:18,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:18,652 INFO L225 Difference]: With dead ends: 142 [2021-11-02 22:53:18,652 INFO L226 Difference]: Without dead ends: 142 [2021-11-02 22:53:18,652 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2021-11-02 22:53:18,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-11-02 22:53:18,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 122. [2021-11-02 22:53:18,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 87 states have (on average 1.5517241379310345) internal successors, (135), 110 states have internal predecessors, (135), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-02 22:53:18,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 147 transitions. [2021-11-02 22:53:18,670 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 147 transitions. Word has length 32 [2021-11-02 22:53:18,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:18,671 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 147 transitions. [2021-11-02 22:53:18,671 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 3.125) internal successors, (50), 14 states have internal predecessors, (50), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:53:18,671 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 147 transitions. [2021-11-02 22:53:18,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-02 22:53:18,672 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:18,672 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-02 22:53:18,713 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:18,886 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-02 22:53:18,886 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting dll_remove_lastErr2REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:18,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:18,886 INFO L85 PathProgramCache]: Analyzing trace with hash 1829392906, now seen corresponding path program 1 times [2021-11-02 22:53:18,886 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:18,887 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1312152210] [2021-11-02 22:53:18,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:18,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:18,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:18,976 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:18,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:18,993 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:19,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:19,039 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 22:53:19,039 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:19,039 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1312152210] [2021-11-02 22:53:19,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1312152210] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:53:19,039 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:53:19,040 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 22:53:19,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504591250] [2021-11-02 22:53:19,040 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:53:19,040 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:19,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:53:19,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:53:19,041 INFO L87 Difference]: Start difference. First operand 122 states and 147 transitions. Second operand has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:19,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:19,594 INFO L93 Difference]: Finished difference Result 165 states and 205 transitions. [2021-11-02 22:53:19,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 22:53:19,595 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 33 [2021-11-02 22:53:19,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:19,596 INFO L225 Difference]: With dead ends: 165 [2021-11-02 22:53:19,597 INFO L226 Difference]: Without dead ends: 165 [2021-11-02 22:53:19,597 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:53:19,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-11-02 22:53:19,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 127. [2021-11-02 22:53:19,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 91 states have (on average 1.5714285714285714) internal successors, (143), 114 states have internal predecessors, (143), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-02 22:53:19,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 157 transitions. [2021-11-02 22:53:19,603 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 157 transitions. Word has length 33 [2021-11-02 22:53:19,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:19,603 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 157 transitions. [2021-11-02 22:53:19,604 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:19,604 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 157 transitions. [2021-11-02 22:53:19,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-02 22:53:19,605 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:19,605 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-02 22:53:19,605 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-02 22:53:19,605 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting dll_remove_lastErr3REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:19,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:19,606 INFO L85 PathProgramCache]: Analyzing trace with hash 1829392907, now seen corresponding path program 1 times [2021-11-02 22:53:19,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:19,606 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185262135] [2021-11-02 22:53:19,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:19,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:19,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:19,704 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:19,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:19,722 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:19,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:19,782 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:53:19,782 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:19,782 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185262135] [2021-11-02 22:53:19,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1185262135] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:53:19,783 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:53:19,783 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 22:53:19,783 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979772788] [2021-11-02 22:53:19,783 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:53:19,783 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:19,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:53:19,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:53:19,784 INFO L87 Difference]: Start difference. First operand 127 states and 157 transitions. Second operand has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:20,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:20,375 INFO L93 Difference]: Finished difference Result 168 states and 208 transitions. [2021-11-02 22:53:20,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 22:53:20,376 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 33 [2021-11-02 22:53:20,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:20,377 INFO L225 Difference]: With dead ends: 168 [2021-11-02 22:53:20,378 INFO L226 Difference]: Without dead ends: 168 [2021-11-02 22:53:20,378 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:53:20,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-02 22:53:20,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 127. [2021-11-02 22:53:20,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 91 states have (on average 1.5494505494505495) internal successors, (141), 114 states have internal predecessors, (141), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-02 22:53:20,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 155 transitions. [2021-11-02 22:53:20,384 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 155 transitions. Word has length 33 [2021-11-02 22:53:20,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:20,384 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 155 transitions. [2021-11-02 22:53:20,384 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:20,384 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 155 transitions. [2021-11-02 22:53:20,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-02 22:53:20,385 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:20,385 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:20,386 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-02 22:53:20,386 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting dll_remove_lastErr6ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:20,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:20,387 INFO L85 PathProgramCache]: Analyzing trace with hash 604055652, now seen corresponding path program 1 times [2021-11-02 22:53:20,387 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:20,387 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681303857] [2021-11-02 22:53:20,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:20,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:20,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:20,463 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:20,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:20,482 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:20,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:20,532 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:53:20,533 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:20,533 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681303857] [2021-11-02 22:53:20,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1681303857] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:53:20,533 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:53:20,533 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 22:53:20,533 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140537169] [2021-11-02 22:53:20,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:53:20,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:20,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:53:20,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:53:20,535 INFO L87 Difference]: Start difference. First operand 127 states and 155 transitions. Second operand has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 8 states have internal predecessors, (30), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:20,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:20,960 INFO L93 Difference]: Finished difference Result 126 states and 153 transitions. [2021-11-02 22:53:20,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 22:53:20,961 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 8 states have internal predecessors, (30), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 36 [2021-11-02 22:53:20,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:20,962 INFO L225 Difference]: With dead ends: 126 [2021-11-02 22:53:20,962 INFO L226 Difference]: Without dead ends: 126 [2021-11-02 22:53:20,963 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2021-11-02 22:53:20,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-02 22:53:20,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2021-11-02 22:53:20,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 91 states have (on average 1.5274725274725274) internal successors, (139), 113 states have internal predecessors, (139), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-02 22:53:20,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 153 transitions. [2021-11-02 22:53:20,969 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 153 transitions. Word has length 36 [2021-11-02 22:53:20,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:20,970 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 153 transitions. [2021-11-02 22:53:20,970 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 8 states have internal predecessors, (30), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:20,970 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 153 transitions. [2021-11-02 22:53:20,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-02 22:53:20,971 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:20,971 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:20,972 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-02 22:53:20,972 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting dll_remove_lastErr13REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:20,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:20,973 INFO L85 PathProgramCache]: Analyzing trace with hash 1546287056, now seen corresponding path program 1 times [2021-11-02 22:53:20,973 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:20,973 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1798891234] [2021-11-02 22:53:20,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:20,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:20,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:21,055 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:21,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:21,072 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:21,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:21,084 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-02 22:53:21,084 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:21,084 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1798891234] [2021-11-02 22:53:21,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1798891234] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:53:21,085 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:53:21,085 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:53:21,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951174187] [2021-11-02 22:53:21,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:53:21,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:21,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:53:21,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:53:21,087 INFO L87 Difference]: Start difference. First operand 126 states and 153 transitions. Second operand has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:21,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:21,419 INFO L93 Difference]: Finished difference Result 127 states and 153 transitions. [2021-11-02 22:53:21,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:53:21,419 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 37 [2021-11-02 22:53:21,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:21,420 INFO L225 Difference]: With dead ends: 127 [2021-11-02 22:53:21,420 INFO L226 Difference]: Without dead ends: 127 [2021-11-02 22:53:21,421 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:53:21,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-02 22:53:21,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2021-11-02 22:53:21,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 93 states have (on average 1.4946236559139785) internal successors, (139), 113 states have internal predecessors, (139), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-02 22:53:21,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 153 transitions. [2021-11-02 22:53:21,426 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 153 transitions. Word has length 37 [2021-11-02 22:53:21,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:21,426 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 153 transitions. [2021-11-02 22:53:21,426 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:21,427 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 153 transitions. [2021-11-02 22:53:21,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-02 22:53:21,427 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:21,427 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:21,428 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-02 22:53:21,428 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting dll_remove_lastErr14REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:21,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:21,428 INFO L85 PathProgramCache]: Analyzing trace with hash 1546287057, now seen corresponding path program 1 times [2021-11-02 22:53:21,428 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:21,428 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [343304014] [2021-11-02 22:53:21,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:21,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:21,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:21,586 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:21,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:21,607 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:21,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:21,685 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:53:21,686 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:21,686 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [343304014] [2021-11-02 22:53:21,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [343304014] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:53:21,686 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:53:21,686 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-11-02 22:53:21,686 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499584213] [2021-11-02 22:53:21,687 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-02 22:53:21,687 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:21,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-02 22:53:21,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:53:21,688 INFO L87 Difference]: Start difference. First operand 126 states and 153 transitions. Second operand has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:22,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:22,391 INFO L93 Difference]: Finished difference Result 188 states and 230 transitions. [2021-11-02 22:53:22,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-02 22:53:22,391 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 37 [2021-11-02 22:53:22,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:22,393 INFO L225 Difference]: With dead ends: 188 [2021-11-02 22:53:22,393 INFO L226 Difference]: Without dead ends: 188 [2021-11-02 22:53:22,394 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=97, Invalid=455, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:53:22,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-11-02 22:53:22,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 150. [2021-11-02 22:53:22,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 115 states have (on average 1.4956521739130435) internal successors, (172), 137 states have internal predecessors, (172), 7 states have call successors, (7), 7 states have call predecessors, (7), 7 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-02 22:53:22,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 188 transitions. [2021-11-02 22:53:22,401 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 188 transitions. Word has length 37 [2021-11-02 22:53:22,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:22,401 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 188 transitions. [2021-11-02 22:53:22,402 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:22,402 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 188 transitions. [2021-11-02 22:53:22,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-02 22:53:22,402 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:22,403 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:22,403 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-02 22:53:22,403 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting dll_remove_lastErr7ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:22,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:22,404 INFO L85 PathProgramCache]: Analyzing trace with hash 1545856107, now seen corresponding path program 1 times [2021-11-02 22:53:22,404 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:22,404 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546895482] [2021-11-02 22:53:22,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:22,404 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:22,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:22,486 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:22,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:22,504 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:22,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:22,563 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:53:22,564 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:22,564 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1546895482] [2021-11-02 22:53:22,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1546895482] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:53:22,564 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:53:22,564 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 22:53:22,564 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89012916] [2021-11-02 22:53:22,564 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:53:22,564 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:22,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:53:22,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:53:22,565 INFO L87 Difference]: Start difference. First operand 150 states and 188 transitions. Second operand has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 8 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:23,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:23,130 INFO L93 Difference]: Finished difference Result 182 states and 226 transitions. [2021-11-02 22:53:23,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-02 22:53:23,131 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 8 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 37 [2021-11-02 22:53:23,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:23,132 INFO L225 Difference]: With dead ends: 182 [2021-11-02 22:53:23,133 INFO L226 Difference]: Without dead ends: 182 [2021-11-02 22:53:23,133 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2021-11-02 22:53:23,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-11-02 22:53:23,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 156. [2021-11-02 22:53:23,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 121 states have (on average 1.4793388429752066) internal successors, (179), 143 states have internal predecessors, (179), 7 states have call successors, (7), 7 states have call predecessors, (7), 7 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-02 22:53:23,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 195 transitions. [2021-11-02 22:53:23,139 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 195 transitions. Word has length 37 [2021-11-02 22:53:23,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:23,140 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 195 transitions. [2021-11-02 22:53:23,140 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 8 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:23,140 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 195 transitions. [2021-11-02 22:53:23,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-02 22:53:23,141 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:23,141 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:23,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-02 22:53:23,141 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting dll_remove_lastErr8ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:23,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:23,142 INFO L85 PathProgramCache]: Analyzing trace with hash 676899142, now seen corresponding path program 1 times [2021-11-02 22:53:23,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:23,142 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1121109205] [2021-11-02 22:53:23,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:23,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:23,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:23,204 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:23,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:23,221 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:23,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:23,230 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-02 22:53:23,230 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:23,231 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1121109205] [2021-11-02 22:53:23,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1121109205] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:53:23,231 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:53:23,231 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-02 22:53:23,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956630625] [2021-11-02 22:53:23,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:53:23,232 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:23,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:53:23,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:53:23,233 INFO L87 Difference]: Start difference. First operand 156 states and 195 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:23,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:23,476 INFO L93 Difference]: Finished difference Result 155 states and 193 transitions. [2021-11-02 22:53:23,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:53:23,477 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), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 38 [2021-11-02 22:53:23,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:23,478 INFO L225 Difference]: With dead ends: 155 [2021-11-02 22:53:23,478 INFO L226 Difference]: Without dead ends: 155 [2021-11-02 22:53:23,478 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:53:23,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-11-02 22:53:23,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 155. [2021-11-02 22:53:23,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 121 states have (on average 1.462809917355372) internal successors, (177), 142 states have internal predecessors, (177), 7 states have call successors, (7), 7 states have call predecessors, (7), 7 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-02 22:53:23,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 193 transitions. [2021-11-02 22:53:23,484 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 193 transitions. Word has length 38 [2021-11-02 22:53:23,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:23,485 INFO L470 AbstractCegarLoop]: Abstraction has 155 states and 193 transitions. [2021-11-02 22:53:23,485 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), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:23,485 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 193 transitions. [2021-11-02 22:53:23,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-02 22:53:23,486 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:23,486 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:23,486 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-02 22:53:23,486 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting dll_remove_lastErr17REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:23,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:23,487 INFO L85 PathProgramCache]: Analyzing trace with hash -76822310, now seen corresponding path program 1 times [2021-11-02 22:53:23,487 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:23,487 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2017387367] [2021-11-02 22:53:23,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:23,487 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:23,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:23,673 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:23,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:23,696 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:23,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:23,751 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:53:23,751 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:23,752 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2017387367] [2021-11-02 22:53:23,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2017387367] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:53:23,752 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:53:23,752 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-11-02 22:53:23,752 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505023416] [2021-11-02 22:53:23,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-02 22:53:23,753 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:23,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-02 22:53:23,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=238, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:53:23,754 INFO L87 Difference]: Start difference. First operand 155 states and 193 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:24,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:24,590 INFO L93 Difference]: Finished difference Result 151 states and 181 transitions. [2021-11-02 22:53:24,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-02 22:53:24,590 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 39 [2021-11-02 22:53:24,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:24,592 INFO L225 Difference]: With dead ends: 151 [2021-11-02 22:53:24,592 INFO L226 Difference]: Without dead ends: 151 [2021-11-02 22:53:24,593 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=162, Invalid=768, Unknown=0, NotChecked=0, Total=930 [2021-11-02 22:53:24,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-11-02 22:53:24,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 145. [2021-11-02 22:53:24,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 113 states have (on average 1.424778761061947) internal successors, (161), 132 states have internal predecessors, (161), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-02 22:53:24,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 175 transitions. [2021-11-02 22:53:24,598 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 175 transitions. Word has length 39 [2021-11-02 22:53:24,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:24,598 INFO L470 AbstractCegarLoop]: Abstraction has 145 states and 175 transitions. [2021-11-02 22:53:24,599 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:24,599 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 175 transitions. [2021-11-02 22:53:24,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-02 22:53:24,599 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:24,599 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:24,599 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-02 22:53:24,600 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting dll_remove_lastErr9REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:24,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:24,600 INFO L85 PathProgramCache]: Analyzing trace with hash -490962994, now seen corresponding path program 1 times [2021-11-02 22:53:24,600 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:24,600 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702634407] [2021-11-02 22:53:24,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:24,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:24,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:24,708 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:24,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:24,729 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:24,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:24,785 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:53:24,786 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:24,786 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1702634407] [2021-11-02 22:53:24,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1702634407] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:53:24,786 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:53:24,787 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-11-02 22:53:24,787 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807649916] [2021-11-02 22:53:24,787 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-02 22:53:24,787 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:24,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-02 22:53:24,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:53:24,788 INFO L87 Difference]: Start difference. First operand 145 states and 175 transitions. Second operand has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:53:25,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:25,469 INFO L93 Difference]: Finished difference Result 173 states and 208 transitions. [2021-11-02 22:53:25,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-02 22:53:25,470 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 39 [2021-11-02 22:53:25,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:25,471 INFO L225 Difference]: With dead ends: 173 [2021-11-02 22:53:25,472 INFO L226 Difference]: Without dead ends: 173 [2021-11-02 22:53:25,472 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=113, Invalid=589, Unknown=0, NotChecked=0, Total=702 [2021-11-02 22:53:25,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-11-02 22:53:25,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 149. [2021-11-02 22:53:25,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 117 states have (on average 1.4188034188034189) internal successors, (166), 136 states have internal predecessors, (166), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-02 22:53:25,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 180 transitions. [2021-11-02 22:53:25,478 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 180 transitions. Word has length 39 [2021-11-02 22:53:25,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:25,479 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 180 transitions. [2021-11-02 22:53:25,479 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:53:25,479 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 180 transitions. [2021-11-02 22:53:25,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-02 22:53:25,480 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:25,480 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:25,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-02 22:53:25,480 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting dll_remove_lastErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:25,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:25,481 INFO L85 PathProgramCache]: Analyzing trace with hash -2016451191, now seen corresponding path program 2 times [2021-11-02 22:53:25,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:25,481 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [122931565] [2021-11-02 22:53:25,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:25,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:25,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:25,521 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:25,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:25,534 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:25,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:25,583 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 1 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:25,583 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:25,583 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [122931565] [2021-11-02 22:53:25,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [122931565] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:25,583 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1718011006] [2021-11-02 22:53:25,584 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:53:25,584 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:25,584 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:25,586 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:25,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-02 22:53:25,837 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:53:25,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:53:25,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-02 22:53:25,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:25,968 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:25,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1718011006] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:25,969 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:53:25,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 11 [2021-11-02 22:53:25,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115271484] [2021-11-02 22:53:25,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-02 22:53:25,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:25,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-02 22:53:25,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:53:25,970 INFO L87 Difference]: Start difference. First operand 149 states and 180 transitions. Second operand has 11 states, 9 states have (on average 4.888888888888889) internal successors, (44), 9 states have internal predecessors, (44), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:53:26,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:26,221 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2021-11-02 22:53:26,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:53:26,221 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 4.888888888888889) internal successors, (44), 9 states have internal predecessors, (44), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 40 [2021-11-02 22:53:26,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:26,222 INFO L225 Difference]: With dead ends: 100 [2021-11-02 22:53:26,222 INFO L226 Difference]: Without dead ends: 89 [2021-11-02 22:53:26,222 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:53:26,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-02 22:53:26,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-11-02 22:53:26,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 66 states have (on average 1.2878787878787878) internal successors, (85), 80 states have internal predecessors, (85), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:53:26,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 94 transitions. [2021-11-02 22:53:26,225 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 94 transitions. Word has length 40 [2021-11-02 22:53:26,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:26,226 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 94 transitions. [2021-11-02 22:53:26,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 4.888888888888889) internal successors, (44), 9 states have internal predecessors, (44), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:53:26,226 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 94 transitions. [2021-11-02 22:53:26,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-02 22:53:26,227 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:26,227 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:26,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:26,438 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:26,438 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting dll_remove_lastErr13REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:26,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:26,439 INFO L85 PathProgramCache]: Analyzing trace with hash -811741562, now seen corresponding path program 1 times [2021-11-02 22:53:26,439 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:26,439 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657717753] [2021-11-02 22:53:26,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:26,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:26,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:26,606 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:26,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:26,628 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:26,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:26,821 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:26,821 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:26,821 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657717753] [2021-11-02 22:53:26,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657717753] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:26,821 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1479837941] [2021-11-02 22:53:26,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:26,822 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:26,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:26,826 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:26,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-02 22:53:27,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:27,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-02 22:53:27,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:27,155 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 [2021-11-02 22:53:27,193 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-02 22:53:27,194 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-11-02 22:53:27,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-02 22:53:27,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 23 [2021-11-02 22:53:27,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:53:27,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:53:27,281 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 18 treesize of output 22 [2021-11-02 22:53:27,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:53:27,370 INFO L354 Elim1Store]: treesize reduction 68, result has 21.8 percent of original size [2021-11-02 22:53:27,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 56 treesize of output 43 [2021-11-02 22:53:27,430 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [dll_create_~head~0.offset] [2021-11-02 22:53:27,430 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:53:27,430 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2021-11-02 22:53:27,430 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570315170] [2021-11-02 22:53:27,431 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-02 22:53:27,431 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:27,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-02 22:53:27,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=458, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:53:27,432 INFO L87 Difference]: Start difference. First operand 89 states and 94 transitions. Second operand has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 16 states have internal predecessors, (35), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:28,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:28,410 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2021-11-02 22:53:28,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-02 22:53:28,412 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 16 states have internal predecessors, (35), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 41 [2021-11-02 22:53:28,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:28,413 INFO L225 Difference]: With dead ends: 102 [2021-11-02 22:53:28,413 INFO L226 Difference]: Without dead ends: 102 [2021-11-02 22:53:28,414 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=186, Invalid=1296, Unknown=0, NotChecked=0, Total=1482 [2021-11-02 22:53:28,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-11-02 22:53:28,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 91. [2021-11-02 22:53:28,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 68 states have (on average 1.2941176470588236) internal successors, (88), 82 states have internal predecessors, (88), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:53:28,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 97 transitions. [2021-11-02 22:53:28,418 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 97 transitions. Word has length 41 [2021-11-02 22:53:28,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:28,418 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 97 transitions. [2021-11-02 22:53:28,418 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 16 states have internal predecessors, (35), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:28,419 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 97 transitions. [2021-11-02 22:53:28,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-02 22:53:28,423 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:28,423 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:28,447 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:28,630 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-02 22:53:28,630 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting dll_remove_lastErr14REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:28,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:28,630 INFO L85 PathProgramCache]: Analyzing trace with hash -811741561, now seen corresponding path program 1 times [2021-11-02 22:53:28,630 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:28,630 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [350900937] [2021-11-02 22:53:28,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:28,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:28,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:28,870 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:28,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:28,895 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:28,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:29,216 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:29,216 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:29,216 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [350900937] [2021-11-02 22:53:29,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [350900937] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:29,216 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1000307620] [2021-11-02 22:53:29,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:29,216 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:29,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:29,218 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:29,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-02 22:53:29,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:29,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 76 conjunts are in the unsatisfiable core [2021-11-02 22:53:29,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:29,522 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 [2021-11-02 22:53:29,637 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-02 22:53:29,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-11-02 22:53:29,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-02 22:53:29,713 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-02 22:53:29,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:53:29,778 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-02 22:53:29,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:53:29,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-02 22:53:29,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:53:29,901 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 22:53:29,910 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-11-02 22:53:29,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 95 treesize of output 70 [2021-11-02 22:53:29,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:53:29,920 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 22:53:29,930 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-02 22:53:29,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 85 treesize of output 81 [2021-11-02 22:53:31,379 INFO L354 Elim1Store]: treesize reduction 65, result has 11.0 percent of original size [2021-11-02 22:53:31,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 10 case distinctions, treesize of input 140 treesize of output 73 [2021-11-02 22:53:31,399 INFO L354 Elim1Store]: treesize reduction 46, result has 6.1 percent of original size [2021-11-02 22:53:31,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 55 treesize of output 37 [2021-11-02 22:53:31,520 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:31,520 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1000307620] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:31,521 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:53:31,521 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 41 [2021-11-02 22:53:31,521 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156772000] [2021-11-02 22:53:31,521 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-02 22:53:31,521 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:31,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-02 22:53:31,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1626, Unknown=0, NotChecked=0, Total=1722 [2021-11-02 22:53:31,523 INFO L87 Difference]: Start difference. First operand 91 states and 97 transitions. Second operand has 42 states, 40 states have (on average 1.725) internal successors, (69), 36 states have internal predecessors, (69), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:53:35,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:35,395 INFO L93 Difference]: Finished difference Result 113 states and 120 transitions. [2021-11-02 22:53:35,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-02 22:53:35,396 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 40 states have (on average 1.725) internal successors, (69), 36 states have internal predecessors, (69), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2021-11-02 22:53:35,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:35,397 INFO L225 Difference]: With dead ends: 113 [2021-11-02 22:53:35,397 INFO L226 Difference]: Without dead ends: 113 [2021-11-02 22:53:35,399 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 592 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=346, Invalid=3686, Unknown=0, NotChecked=0, Total=4032 [2021-11-02 22:53:35,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-02 22:53:35,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 99. [2021-11-02 22:53:35,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 75 states have (on average 1.3066666666666666) internal successors, (98), 90 states have internal predecessors, (98), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 22:53:35,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 108 transitions. [2021-11-02 22:53:35,402 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 108 transitions. Word has length 41 [2021-11-02 22:53:35,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:35,403 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 108 transitions. [2021-11-02 22:53:35,403 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 40 states have (on average 1.725) internal successors, (69), 36 states have internal predecessors, (69), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:53:35,403 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 108 transitions. [2021-11-02 22:53:35,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-02 22:53:35,404 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:35,404 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:35,434 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:35,604 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-02 22:53:35,604 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting dll_remove_lastErr17REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:35,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:35,605 INFO L85 PathProgramCache]: Analyzing trace with hash 1600408080, now seen corresponding path program 1 times [2021-11-02 22:53:35,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:35,605 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [16255760] [2021-11-02 22:53:35,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:35,605 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:35,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:35,671 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:35,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:35,686 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:35,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:35,695 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-02 22:53:35,695 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:35,695 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [16255760] [2021-11-02 22:53:35,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [16255760] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:35,696 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1972935747] [2021-11-02 22:53:35,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:35,697 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:35,698 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:35,699 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:35,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-02 22:53:36,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:36,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-02 22:53:36,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:36,103 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 7 treesize of output 3 [2021-11-02 22:53:36,122 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-02 22:53:36,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1972935747] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:36,122 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:53:36,122 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 3] total 8 [2021-11-02 22:53:36,122 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386123598] [2021-11-02 22:53:36,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:53:36,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:36,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:53:36,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:53:36,123 INFO L87 Difference]: Start difference. First operand 99 states and 108 transitions. Second operand has 9 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:36,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:36,493 INFO L93 Difference]: Finished difference Result 99 states and 106 transitions. [2021-11-02 22:53:36,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:53:36,494 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 43 [2021-11-02 22:53:36,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:36,495 INFO L225 Difference]: With dead ends: 99 [2021-11-02 22:53:36,495 INFO L226 Difference]: Without dead ends: 99 [2021-11-02 22:53:36,495 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=81, Invalid=225, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:53:36,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-02 22:53:36,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2021-11-02 22:53:36,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 75 states have (on average 1.28) internal successors, (96), 89 states have internal predecessors, (96), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 22:53:36,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 106 transitions. [2021-11-02 22:53:36,501 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 106 transitions. Word has length 43 [2021-11-02 22:53:36,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:36,501 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 106 transitions. [2021-11-02 22:53:36,501 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:36,501 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 106 transitions. [2021-11-02 22:53:36,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-02 22:53:36,502 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:36,502 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:36,536 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:36,730 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-02 22:53:36,730 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting dll_remove_lastErr18REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:36,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:36,730 INFO L85 PathProgramCache]: Analyzing trace with hash 1600408081, now seen corresponding path program 1 times [2021-11-02 22:53:36,730 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:36,730 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615435435] [2021-11-02 22:53:36,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:36,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:36,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:36,948 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:36,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:36,978 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:36,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:37,056 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:53:37,056 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:37,056 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615435435] [2021-11-02 22:53:37,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1615435435] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:37,057 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [415243504] [2021-11-02 22:53:37,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:37,057 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:37,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:37,058 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:37,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-02 22:53:37,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:37,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-02 22:53:37,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:37,454 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 7 treesize of output 3 [2021-11-02 22:53:37,546 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-02 22:53:37,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [415243504] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:37,547 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:53:37,547 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 3] total 17 [2021-11-02 22:53:37,547 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138490571] [2021-11-02 22:53:37,547 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-02 22:53:37,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:37,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-02 22:53:37,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=268, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:53:37,549 INFO L87 Difference]: Start difference. First operand 98 states and 106 transitions. Second operand has 18 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 14 states have internal predecessors, (59), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-02 22:53:38,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:38,582 INFO L93 Difference]: Finished difference Result 107 states and 114 transitions. [2021-11-02 22:53:38,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-02 22:53:38,582 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 14 states have internal predecessors, (59), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 43 [2021-11-02 22:53:38,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:38,583 INFO L225 Difference]: With dead ends: 107 [2021-11-02 22:53:38,583 INFO L226 Difference]: Without dead ends: 107 [2021-11-02 22:53:38,584 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=248, Invalid=1234, Unknown=0, NotChecked=0, Total=1482 [2021-11-02 22:53:38,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-02 22:53:38,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 95. [2021-11-02 22:53:38,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 74 states have (on average 1.2432432432432432) internal successors, (92), 86 states have internal predecessors, (92), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 22:53:38,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 102 transitions. [2021-11-02 22:53:38,587 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 102 transitions. Word has length 43 [2021-11-02 22:53:38,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:38,588 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 102 transitions. [2021-11-02 22:53:38,588 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 14 states have internal predecessors, (59), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-02 22:53:38,588 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 102 transitions. [2021-11-02 22:53:38,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-02 22:53:38,589 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:38,589 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:38,610 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:38,794 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-02 22:53:38,794 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting mainErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:38,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:38,794 INFO L85 PathProgramCache]: Analyzing trace with hash -1924081036, now seen corresponding path program 1 times [2021-11-02 22:53:38,794 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:38,794 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343138638] [2021-11-02 22:53:38,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:38,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:38,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:38,836 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:38,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:38,848 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:38,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:38,866 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-11-02 22:53:38,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:38,908 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-02 22:53:38,908 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:38,908 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343138638] [2021-11-02 22:53:38,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343138638] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:53:38,909 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:53:38,909 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:53:38,909 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119558829] [2021-11-02 22:53:38,909 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:53:38,909 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:38,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:53:38,910 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:53:38,910 INFO L87 Difference]: Start difference. First operand 95 states and 102 transitions. Second operand has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 5 states have internal predecessors, (31), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-02 22:53:39,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:39,165 INFO L93 Difference]: Finished difference Result 103 states and 114 transitions. [2021-11-02 22:53:39,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:53:39,165 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 5 states have internal predecessors, (31), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 44 [2021-11-02 22:53:39,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:39,166 INFO L225 Difference]: With dead ends: 103 [2021-11-02 22:53:39,166 INFO L226 Difference]: Without dead ends: 103 [2021-11-02 22:53:39,167 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:53:39,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-02 22:53:39,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-02 22:53:39,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 80 states have (on average 1.2375) internal successors, (99), 92 states have internal predecessors, (99), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-02 22:53:39,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 114 transitions. [2021-11-02 22:53:39,171 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 114 transitions. Word has length 44 [2021-11-02 22:53:39,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:39,171 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 114 transitions. [2021-11-02 22:53:39,171 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 5 states have internal predecessors, (31), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-02 22:53:39,172 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 114 transitions. [2021-11-02 22:53:39,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-02 22:53:39,172 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:39,172 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:39,173 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-02 22:53:39,173 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting dll_remove_lastErr20ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:39,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:39,173 INFO L85 PathProgramCache]: Analyzing trace with hash 393874640, now seen corresponding path program 1 times [2021-11-02 22:53:39,173 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:39,174 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1270367954] [2021-11-02 22:53:39,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:39,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:39,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:39,344 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:39,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:39,367 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:39,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:39,628 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:39,628 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:39,628 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1270367954] [2021-11-02 22:53:39,628 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1270367954] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:39,628 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2015836853] [2021-11-02 22:53:39,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:39,629 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:39,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:39,630 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:39,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-02 22:53:39,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:39,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-02 22:53:40,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:40,058 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 [2021-11-02 22:53:40,131 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-02 22:53:40,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-11-02 22:53:40,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-02 22:53:40,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:53:40,228 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-02 22:53:40,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:53:40,319 INFO L354 Elim1Store]: treesize reduction 68, result has 21.8 percent of original size [2021-11-02 22:53:40,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 56 treesize of output 43 [2021-11-02 22:53:40,390 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [dll_create_~head~0.offset] [2021-11-02 22:53:40,391 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:53:40,391 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2021-11-02 22:53:40,391 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834285879] [2021-11-02 22:53:40,391 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-02 22:53:40,391 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:40,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-02 22:53:40,392 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=542, Unknown=0, NotChecked=0, Total=600 [2021-11-02 22:53:40,392 INFO L87 Difference]: Start difference. First operand 103 states and 114 transitions. Second operand has 21 states, 20 states have (on average 1.95) internal successors, (39), 17 states have internal predecessors, (39), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:41,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:41,380 INFO L93 Difference]: Finished difference Result 112 states and 123 transitions. [2021-11-02 22:53:41,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-02 22:53:41,381 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.95) internal successors, (39), 17 states have internal predecessors, (39), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 45 [2021-11-02 22:53:41,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:41,382 INFO L225 Difference]: With dead ends: 112 [2021-11-02 22:53:41,382 INFO L226 Difference]: Without dead ends: 112 [2021-11-02 22:53:41,382 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=183, Invalid=1377, Unknown=0, NotChecked=0, Total=1560 [2021-11-02 22:53:41,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-02 22:53:41,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 103. [2021-11-02 22:53:41,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 80 states have (on average 1.225) internal successors, (98), 92 states have internal predecessors, (98), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-02 22:53:41,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 113 transitions. [2021-11-02 22:53:41,386 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 113 transitions. Word has length 45 [2021-11-02 22:53:41,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:41,386 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 113 transitions. [2021-11-02 22:53:41,386 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.95) internal successors, (39), 17 states have internal predecessors, (39), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:53:41,387 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 113 transitions. [2021-11-02 22:53:41,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-02 22:53:41,387 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:41,387 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:41,415 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:41,606 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:41,606 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting dll_remove_lastErr13REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:41,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:41,606 INFO L85 PathProgramCache]: Analyzing trace with hash 393927228, now seen corresponding path program 2 times [2021-11-02 22:53:41,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:41,606 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970772712] [2021-11-02 22:53:41,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:41,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:41,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:41,937 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:41,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:41,986 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:41,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:42,572 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:42,572 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:42,572 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970772712] [2021-11-02 22:53:42,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1970772712] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:42,572 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [898727121] [2021-11-02 22:53:42,573 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:53:42,573 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:42,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:42,574 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:42,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-02 22:53:42,941 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:53:42,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:53:42,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 87 conjunts are in the unsatisfiable core [2021-11-02 22:53:42,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:42,996 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 [2021-11-02 22:53:43,032 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 [2021-11-02 22:53:43,039 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 [2021-11-02 22:53:43,074 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 0 case distinctions, treesize of input 28 treesize of output 23 [2021-11-02 22:53:43,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:53:43,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:53:43,078 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 18 treesize of output 22 [2021-11-02 22:53:43,087 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 0 case distinctions, treesize of input 28 treesize of output 23 [2021-11-02 22:53:43,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:53:43,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:53:43,092 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 18 treesize of output 22 [2021-11-02 22:53:43,252 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-02 22:53:43,253 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-11-02 22:53:43,359 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2021-11-02 22:53:43,366 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2021-11-02 22:53:43,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2021-11-02 22:53:43,403 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2021-11-02 22:53:43,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:53:43,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2021-11-02 22:53:43,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:53:43,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2021-11-02 22:53:43,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:53:43,632 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 22:53:43,632 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 22:53:43,642 INFO L354 Elim1Store]: treesize reduction 35, result has 20.5 percent of original size [2021-11-02 22:53:43,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 136 treesize of output 92 [2021-11-02 22:53:43,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:53:43,648 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 22:53:43,649 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 22:53:43,658 INFO L354 Elim1Store]: treesize reduction 59, result has 13.2 percent of original size [2021-11-02 22:53:43,659 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 113 treesize of output 102 [2021-11-02 22:53:45,303 INFO L354 Elim1Store]: treesize reduction 166, result has 6.2 percent of original size [2021-11-02 22:53:45,303 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 3 disjoint index pairs (out of 21 index pairs), introduced 11 new quantified variables, introduced 21 case distinctions, treesize of input 197 treesize of output 105 [2021-11-02 22:53:45,336 INFO L354 Elim1Store]: treesize reduction 126, result has 5.3 percent of original size [2021-11-02 22:53:45,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 3 disjoint index pairs (out of 21 index pairs), introduced 9 new quantified variables, introduced 21 case distinctions, treesize of input 66 treesize of output 46 [2021-11-02 22:53:45,381 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:45,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [898727121] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:45,382 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:53:45,382 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 46 [2021-11-02 22:53:45,382 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8226883] [2021-11-02 22:53:45,382 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-02 22:53:45,382 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:45,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-02 22:53:45,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1941, Unknown=0, NotChecked=0, Total=2070 [2021-11-02 22:53:45,385 INFO L87 Difference]: Start difference. First operand 103 states and 113 transitions. Second operand has 46 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 40 states have internal predecessors, (73), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:53:50,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:50,353 INFO L93 Difference]: Finished difference Result 103 states and 111 transitions. [2021-11-02 22:53:50,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-02 22:53:50,354 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 40 states have internal predecessors, (73), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 45 [2021-11-02 22:53:50,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:50,355 INFO L225 Difference]: With dead ends: 103 [2021-11-02 22:53:50,355 INFO L226 Difference]: Without dead ends: 103 [2021-11-02 22:53:50,356 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 28 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1002 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=366, Invalid=4326, Unknown=0, NotChecked=0, Total=4692 [2021-11-02 22:53:50,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-02 22:53:50,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-02 22:53:50,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 80 states have (on average 1.2125) internal successors, (97), 92 states have internal predecessors, (97), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (8), 4 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-02 22:53:50,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 111 transitions. [2021-11-02 22:53:50,360 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 111 transitions. Word has length 45 [2021-11-02 22:53:50,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:50,360 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 111 transitions. [2021-11-02 22:53:50,360 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 40 states have internal predecessors, (73), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:53:50,360 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 111 transitions. [2021-11-02 22:53:50,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-02 22:53:50,361 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:50,361 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:50,383 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:50,566 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-02 22:53:50,566 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting mainErr2ASSERT_VIOLATIONMEMORY_LEAK === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:50,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:50,566 INFO L85 PathProgramCache]: Analyzing trace with hash 2089031702, now seen corresponding path program 1 times [2021-11-02 22:53:50,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:50,567 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1563169570] [2021-11-02 22:53:50,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:50,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:50,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:50,616 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:50,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:50,630 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:50,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:50,651 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-11-02 22:53:50,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:50,657 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-02 22:53:50,657 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:50,657 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1563169570] [2021-11-02 22:53:50,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1563169570] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:50,659 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1246443530] [2021-11-02 22:53:50,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:50,659 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:50,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:50,662 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:50,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-02 22:53:51,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:51,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-02 22:53:51,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:51,201 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-02 22:53:51,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1246443530] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:51,201 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:53:51,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 9 [2021-11-02 22:53:51,201 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341582557] [2021-11-02 22:53:51,202 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:53:51,202 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:51,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:53:51,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:53:51,203 INFO L87 Difference]: Start difference. First operand 103 states and 111 transitions. Second operand has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 6 states have internal predecessors, (38), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:53:51,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:51,366 INFO L93 Difference]: Finished difference Result 107 states and 115 transitions. [2021-11-02 22:53:51,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:53:51,366 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 6 states have internal predecessors, (38), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 46 [2021-11-02 22:53:51,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:51,367 INFO L225 Difference]: With dead ends: 107 [2021-11-02 22:53:51,368 INFO L226 Difference]: Without dead ends: 107 [2021-11-02 22:53:51,368 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:53:51,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-02 22:53:51,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2021-11-02 22:53:51,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 84 states have (on average 1.2023809523809523) internal successors, (101), 94 states have internal predecessors, (101), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-02 22:53:51,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 115 transitions. [2021-11-02 22:53:51,372 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 115 transitions. Word has length 46 [2021-11-02 22:53:51,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:51,372 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 115 transitions. [2021-11-02 22:53:51,372 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 6 states have internal predecessors, (38), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:53:51,372 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 115 transitions. [2021-11-02 22:53:51,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-02 22:53:51,373 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:51,373 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:51,405 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:51,573 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-02 22:53:51,573 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting dll_remove_lastErr2REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:51,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:51,574 INFO L85 PathProgramCache]: Analyzing trace with hash 339086038, now seen corresponding path program 1 times [2021-11-02 22:53:51,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:51,574 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1314576018] [2021-11-02 22:53:51,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:51,574 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:51,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:51,662 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:51,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:51,679 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:51,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:51,842 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-11-02 22:53:51,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:52,083 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 9 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:52,083 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:52,083 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1314576018] [2021-11-02 22:53:52,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1314576018] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:52,083 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1036153138] [2021-11-02 22:53:52,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:52,084 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:52,084 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:52,090 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:52,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-02 22:53:52,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:52,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-02 22:53:52,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:52,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:53:52,675 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-02 22:53:52,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-11-02 22:53:52,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 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 [2021-11-02 22:53:52,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-02 22:53:52,836 INFO L354 Elim1Store]: treesize reduction 56, result has 21.1 percent of original size [2021-11-02 22:53:52,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 45 treesize of output 38 [2021-11-02 22:53:53,410 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 17 [2021-11-02 22:53:53,467 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:53:53,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1036153138] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:53,467 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:53:53,467 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 20] total 39 [2021-11-02 22:53:53,467 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912287954] [2021-11-02 22:53:53,468 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-02 22:53:53,468 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:53,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-02 22:53:53,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1377, Unknown=0, NotChecked=0, Total=1482 [2021-11-02 22:53:53,469 INFO L87 Difference]: Start difference. First operand 107 states and 115 transitions. Second operand has 39 states, 38 states have (on average 1.868421052631579) internal successors, (71), 33 states have internal predecessors, (71), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 22:53:55,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:55,112 INFO L93 Difference]: Finished difference Result 105 states and 112 transitions. [2021-11-02 22:53:55,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-02 22:53:55,112 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.868421052631579) internal successors, (71), 33 states have internal predecessors, (71), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 47 [2021-11-02 22:53:55,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:55,113 INFO L225 Difference]: With dead ends: 105 [2021-11-02 22:53:55,113 INFO L226 Difference]: Without dead ends: 100 [2021-11-02 22:53:55,115 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=331, Invalid=3091, Unknown=0, NotChecked=0, Total=3422 [2021-11-02 22:53:55,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-02 22:53:55,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-11-02 22:53:55,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 77 states have (on average 1.2077922077922079) internal successors, (93), 88 states have internal predecessors, (93), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-02 22:53:55,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 106 transitions. [2021-11-02 22:53:55,119 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 106 transitions. Word has length 47 [2021-11-02 22:53:55,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:55,119 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 106 transitions. [2021-11-02 22:53:55,119 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 1.868421052631579) internal successors, (71), 33 states have internal predecessors, (71), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 22:53:55,120 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 106 transitions. [2021-11-02 22:53:55,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-02 22:53:55,120 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:55,120 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:55,171 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:55,334 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:55,334 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting dll_remove_lastErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:55,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:55,334 INFO L85 PathProgramCache]: Analyzing trace with hash -1172150217, now seen corresponding path program 1 times [2021-11-02 22:53:55,334 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:55,334 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1225147301] [2021-11-02 22:53:55,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:55,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:55,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:55,424 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:55,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:55,440 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:55,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:55,467 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-11-02 22:53:55,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:55,554 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-02 22:53:55,554 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:55,554 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1225147301] [2021-11-02 22:53:55,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1225147301] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:55,555 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [36658263] [2021-11-02 22:53:55,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:55,555 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:55,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:55,558 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:55,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-02 22:53:56,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:56,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-02 22:53:56,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:56,104 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 [2021-11-02 22:53:56,126 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 [2021-11-02 22:53:56,332 INFO L354 Elim1Store]: treesize reduction 50, result has 9.1 percent of original size [2021-11-02 22:53:56,333 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 20 treesize of output 19 [2021-11-02 22:53:56,379 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 [2021-11-02 22:53:56,500 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:53:56,500 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 17 treesize of output 19 [2021-11-02 22:53:56,656 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-02 22:53:56,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [36658263] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:56,657 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:53:56,657 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 24 [2021-11-02 22:53:56,657 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434606309] [2021-11-02 22:53:56,657 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-02 22:53:56,657 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:56,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-02 22:53:56,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=528, Unknown=0, NotChecked=0, Total=600 [2021-11-02 22:53:56,658 INFO L87 Difference]: Start difference. First operand 100 states and 106 transitions. Second operand has 25 states, 24 states have (on average 3.4166666666666665) internal successors, (82), 21 states have internal predecessors, (82), 5 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-02 22:53:58,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:58,114 INFO L93 Difference]: Finished difference Result 128 states and 136 transitions. [2021-11-02 22:53:58,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-02 22:53:58,115 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 3.4166666666666665) internal successors, (82), 21 states have internal predecessors, (82), 5 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 53 [2021-11-02 22:53:58,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:58,116 INFO L225 Difference]: With dead ends: 128 [2021-11-02 22:53:58,116 INFO L226 Difference]: Without dead ends: 128 [2021-11-02 22:53:58,117 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=253, Invalid=1387, Unknown=0, NotChecked=0, Total=1640 [2021-11-02 22:53:58,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-02 22:53:58,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 90. [2021-11-02 22:53:58,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 71 states have (on average 1.1830985915492958) internal successors, (84), 80 states have internal predecessors, (84), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:53:58,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 93 transitions. [2021-11-02 22:53:58,120 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 93 transitions. Word has length 53 [2021-11-02 22:53:58,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:58,120 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 93 transitions. [2021-11-02 22:53:58,121 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 3.4166666666666665) internal successors, (82), 21 states have internal predecessors, (82), 5 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-02 22:53:58,121 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 93 transitions. [2021-11-02 22:53:58,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-02 22:53:58,121 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:58,125 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:58,163 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:58,334 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:58,334 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting dll_remove_lastErr2REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:53:58,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:58,334 INFO L85 PathProgramCache]: Analyzing trace with hash -1976918352, now seen corresponding path program 1 times [2021-11-02 22:53:58,334 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:58,334 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026499801] [2021-11-02 22:53:58,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:58,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:58,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:58,463 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:58,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:58,487 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:53:58,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:58,571 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-11-02 22:53:58,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:59,400 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:53:59,400 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:59,400 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026499801] [2021-11-02 22:53:59,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2026499801] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:59,400 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [548373692] [2021-11-02 22:53:59,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:59,400 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:59,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:59,406 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:59,442 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-02 22:53:59,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:59,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-02 22:53:59,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:59,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:54:00,094 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-02 22:54:00,094 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-11-02 22:54:00,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 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 [2021-11-02 22:54:00,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-02 22:54:00,374 INFO L354 Elim1Store]: treesize reduction 56, result has 21.1 percent of original size [2021-11-02 22:54:00,374 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 54 treesize of output 43 [2021-11-02 22:54:05,600 INFO L354 Elim1Store]: treesize reduction 186, result has 19.8 percent of original size [2021-11-02 22:54:05,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 126 treesize of output 99 [2021-11-02 22:54:05,628 INFO L354 Elim1Store]: treesize reduction 48, result has 28.4 percent of original size [2021-11-02 22:54:05,629 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 109 treesize of output 118 [2021-11-02 22:54:07,782 INFO L354 Elim1Store]: treesize reduction 106, result has 17.8 percent of original size [2021-11-02 22:54:07,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 3 disjoint index pairs (out of 15 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 111 treesize of output 80 [2021-11-02 22:54:07,994 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:54:07,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [548373692] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:54:07,995 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:54:07,995 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 52 [2021-11-02 22:54:07,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364454011] [2021-11-02 22:54:07,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-02 22:54:07,995 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:54:07,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-02 22:54:07,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2617, Unknown=1, NotChecked=0, Total=2756 [2021-11-02 22:54:07,997 INFO L87 Difference]: Start difference. First operand 90 states and 93 transitions. Second operand has 53 states, 50 states have (on average 1.82) internal successors, (91), 45 states have internal predecessors, (91), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-02 22:55:36,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:55:36,631 INFO L93 Difference]: Finished difference Result 140 states and 148 transitions. [2021-11-02 22:55:36,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-02 22:55:36,632 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 50 states have (on average 1.82) internal successors, (91), 45 states have internal predecessors, (91), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 54 [2021-11-02 22:55:36,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:55:36,633 INFO L225 Difference]: With dead ends: 140 [2021-11-02 22:55:36,633 INFO L226 Difference]: Without dead ends: 140 [2021-11-02 22:55:36,637 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2529 ImplicationChecksByTransitivity, 59.7s TimeCoverageRelationStatistics Valid=1228, Invalid=10955, Unknown=27, NotChecked=0, Total=12210 [2021-11-02 22:55:36,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-02 22:55:36,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 94. [2021-11-02 22:55:36,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 74 states have (on average 1.1891891891891893) internal successors, (88), 83 states have internal predecessors, (88), 6 states have call successors, (6), 6 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-02 22:55:36,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 99 transitions. [2021-11-02 22:55:36,641 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 99 transitions. Word has length 54 [2021-11-02 22:55:36,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:55:36,643 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 99 transitions. [2021-11-02 22:55:36,643 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 50 states have (on average 1.82) internal successors, (91), 45 states have internal predecessors, (91), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-02 22:55:36,644 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 99 transitions. [2021-11-02 22:55:36,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-02 22:55:36,644 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:55:36,644 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:55:36,684 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-11-02 22:55:36,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:55:36,870 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting dll_remove_lastErr3REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:55:36,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:55:36,870 INFO L85 PathProgramCache]: Analyzing trace with hash -1976918351, now seen corresponding path program 1 times [2021-11-02 22:55:36,870 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:55:36,870 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271564699] [2021-11-02 22:55:36,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:55:36,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:55:36,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:55:37,020 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:55:37,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:55:37,041 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:55:37,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:55:37,148 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-11-02 22:55:37,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:55:37,336 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:55:37,336 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:55:37,337 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271564699] [2021-11-02 22:55:37,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [271564699] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:55:37,337 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1822069880] [2021-11-02 22:55:37,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:55:37,337 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:55:37,337 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:55:37,338 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:55:37,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-02 22:55:37,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:55:37,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-02 22:55:37,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:55:38,604 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-02 22:55:38,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 67 treesize of output 72 [2021-11-02 22:55:38,985 INFO L354 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2021-11-02 22:55:38,986 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-02 22:55:39,267 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-02 22:55:39,267 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 74 treesize of output 51 [2021-11-02 22:55:39,271 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-02 22:55:39,271 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 24 [2021-11-02 22:55:39,308 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:55:39,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1822069880] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:55:39,308 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:55:39,308 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 37 [2021-11-02 22:55:39,308 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158940207] [2021-11-02 22:55:39,309 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-02 22:55:39,309 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:55:39,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-02 22:55:39,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1304, Unknown=0, NotChecked=0, Total=1406 [2021-11-02 22:55:39,310 INFO L87 Difference]: Start difference. First operand 94 states and 99 transitions. Second operand has 38 states, 35 states have (on average 2.4) internal successors, (84), 30 states have internal predecessors, (84), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-02 22:55:47,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:55:47,176 INFO L93 Difference]: Finished difference Result 154 states and 164 transitions. [2021-11-02 22:55:47,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-02 22:55:47,177 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 35 states have (on average 2.4) internal successors, (84), 30 states have internal predecessors, (84), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 54 [2021-11-02 22:55:47,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:55:47,178 INFO L225 Difference]: With dead ends: 154 [2021-11-02 22:55:47,178 INFO L226 Difference]: Without dead ends: 154 [2021-11-02 22:55:47,180 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 936 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=718, Invalid=4831, Unknown=1, NotChecked=0, Total=5550 [2021-11-02 22:55:47,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-11-02 22:55:47,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 125. [2021-11-02 22:55:47,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 102 states have (on average 1.2647058823529411) internal successors, (129), 112 states have internal predecessors, (129), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-02 22:55:47,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 145 transitions. [2021-11-02 22:55:47,187 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 145 transitions. Word has length 54 [2021-11-02 22:55:47,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:55:47,188 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 145 transitions. [2021-11-02 22:55:47,188 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 35 states have (on average 2.4) internal successors, (84), 30 states have internal predecessors, (84), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-02 22:55:47,188 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 145 transitions. [2021-11-02 22:55:47,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-02 22:55:47,189 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:55:47,189 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:55:47,220 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-02 22:55:47,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-02 22:55:47,410 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting dll_remove_lastErr14REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:55:47,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:55:47,410 INFO L85 PathProgramCache]: Analyzing trace with hash 560464247, now seen corresponding path program 1 times [2021-11-02 22:55:47,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:55:47,410 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1400586641] [2021-11-02 22:55:47,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:55:47,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:55:47,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:55:47,628 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:55:47,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:55:47,655 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:55:47,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:55:47,810 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-11-02 22:55:47,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:55:48,011 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:55:48,012 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:55:48,012 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1400586641] [2021-11-02 22:55:48,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1400586641] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:55:48,012 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [581333666] [2021-11-02 22:55:48,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:55:48,012 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:55:48,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:55:48,013 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:55:48,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-02 22:55:48,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:55:48,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-02 22:55:48,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:55:48,806 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 39 treesize of output 31 [2021-11-02 22:55:48,810 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 28 treesize of output 16 [2021-11-02 22:55:48,878 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:55:48,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [581333666] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:55:48,879 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:55:48,879 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [21] total 25 [2021-11-02 22:55:48,879 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402604717] [2021-11-02 22:55:48,879 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:55:48,879 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:55:48,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:55:48,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=588, Unknown=0, NotChecked=0, Total=650 [2021-11-02 22:55:48,880 INFO L87 Difference]: Start difference. First operand 125 states and 145 transitions. Second operand has 6 states, 5 states have (on average 8.2) internal successors, (41), 6 states have internal predecessors, (41), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-02 22:55:49,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:55:49,011 INFO L93 Difference]: Finished difference Result 127 states and 147 transitions. [2021-11-02 22:55:49,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:55:49,011 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 8.2) internal successors, (41), 6 states have internal predecessors, (41), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 58 [2021-11-02 22:55:49,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:55:49,012 INFO L225 Difference]: With dead ends: 127 [2021-11-02 22:55:49,012 INFO L226 Difference]: Without dead ends: 127 [2021-11-02 22:55:49,013 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=74, Invalid=738, Unknown=0, NotChecked=0, Total=812 [2021-11-02 22:55:49,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-02 22:55:49,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 125. [2021-11-02 22:55:49,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 102 states have (on average 1.2450980392156863) internal successors, (127), 112 states have internal predecessors, (127), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-02 22:55:49,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 143 transitions. [2021-11-02 22:55:49,019 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 143 transitions. Word has length 58 [2021-11-02 22:55:49,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:55:49,020 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 143 transitions. [2021-11-02 22:55:49,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 8.2) internal successors, (41), 6 states have internal predecessors, (41), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-02 22:55:49,020 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 143 transitions. [2021-11-02 22:55:49,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-02 22:55:49,021 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:55:49,021 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:55:49,053 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-02 22:55:49,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:55:49,246 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting dll_remove_lastErr7ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:55:49,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:55:49,246 INFO L85 PathProgramCache]: Analyzing trace with hash 560033297, now seen corresponding path program 1 times [2021-11-02 22:55:49,246 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:55:49,246 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [441590834] [2021-11-02 22:55:49,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:55:49,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:55:49,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:55:49,386 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:55:49,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:55:49,402 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:55:49,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:55:49,477 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-11-02 22:55:49,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:55:49,627 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:55:49,627 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:55:49,627 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [441590834] [2021-11-02 22:55:49,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [441590834] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:55:49,627 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [31051564] [2021-11-02 22:55:49,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:55:49,628 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:55:49,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:55:49,634 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:55:49,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-02 22:55:50,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:55:50,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-02 22:55:50,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:55:50,669 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 [2021-11-02 22:55:51,707 WARN L860 $PredicateComparison]: unable to prove that (exists ((dll_remove_last_~snd_to_last~0.offset Int)) (= (let ((.cse0 (select (select |c_old(#memory_$Pointer$.base)| |c_dll_remove_last_#in~head.base|) |c_dll_remove_last_#in~head.offset|))) (store |c_old(#memory_$Pointer$.base)| .cse0 (store (select |c_old(#memory_$Pointer$.base)| .cse0) (+ dll_remove_last_~snd_to_last~0.offset 4) 0))) |c_#memory_$Pointer$.base|)) is different from true [2021-11-02 22:55:51,760 INFO L354 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2021-11-02 22:55:51,760 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 25 [2021-11-02 22:55:52,053 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-02 22:55:52,054 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 33 treesize of output 18 [2021-11-02 22:55:52,061 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:55:52,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [31051564] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:55:52,062 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:55:52,062 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17] total 28 [2021-11-02 22:55:52,064 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465482728] [2021-11-02 22:55:52,065 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-02 22:55:52,065 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:55:52,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-02 22:55:52,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=671, Unknown=1, NotChecked=52, Total=812 [2021-11-02 22:55:52,066 INFO L87 Difference]: Start difference. First operand 125 states and 143 transitions. Second operand has 29 states, 26 states have (on average 2.8076923076923075) internal successors, (73), 21 states have internal predecessors, (73), 7 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-02 22:56:52,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:56:52,184 INFO L93 Difference]: Finished difference Result 151 states and 161 transitions. [2021-11-02 22:56:52,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-02 22:56:52,185 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 26 states have (on average 2.8076923076923075) internal successors, (73), 21 states have internal predecessors, (73), 7 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 58 [2021-11-02 22:56:52,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:56:52,187 INFO L225 Difference]: With dead ends: 151 [2021-11-02 22:56:52,187 INFO L226 Difference]: Without dead ends: 151 [2021-11-02 22:56:52,188 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 666 ImplicationChecksByTransitivity, 60.5s TimeCoverageRelationStatistics Valid=503, Invalid=2851, Unknown=72, NotChecked=114, Total=3540 [2021-11-02 22:56:52,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-11-02 22:56:52,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 128. [2021-11-02 22:56:52,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 105 states have (on average 1.2380952380952381) internal successors, (130), 115 states have internal predecessors, (130), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-02 22:56:52,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 146 transitions. [2021-11-02 22:56:52,194 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 146 transitions. Word has length 58 [2021-11-02 22:56:52,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:56:52,194 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 146 transitions. [2021-11-02 22:56:52,194 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 26 states have (on average 2.8076923076923075) internal successors, (73), 21 states have internal predecessors, (73), 7 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-02 22:56:52,195 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 146 transitions. [2021-11-02 22:56:52,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-02 22:56:52,195 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:56:52,196 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:56:52,230 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-02 22:56:52,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:56:52,410 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting dll_remove_lastErr9REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:56:52,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:56:52,410 INFO L85 PathProgramCache]: Analyzing trace with hash 1321089012, now seen corresponding path program 1 times [2021-11-02 22:56:52,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:56:52,411 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618450676] [2021-11-02 22:56:52,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:56:52,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:56:52,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:56:52,547 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:56:52,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:56:52,570 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:56:52,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:56:52,627 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-11-02 22:56:52,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:56:52,639 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-02 22:56:52,640 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:56:52,640 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618450676] [2021-11-02 22:56:52,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [618450676] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:56:52,640 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [828592224] [2021-11-02 22:56:52,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:56:52,641 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:56:52,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:56:52,643 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:56:52,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-02 22:56:53,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:56:53,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-02 22:56:53,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:56:53,941 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:56:53,941 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 17 treesize of output 19 [2021-11-02 22:56:53,966 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-02 22:56:53,966 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [828592224] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:56:53,966 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:56:53,966 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [11] total 13 [2021-11-02 22:56:53,966 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115782296] [2021-11-02 22:56:53,966 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:56:53,967 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:56:53,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:56:53,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:56:53,967 INFO L87 Difference]: Start difference. First operand 128 states and 146 transitions. Second operand has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:56:54,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:56:54,136 INFO L93 Difference]: Finished difference Result 129 states and 149 transitions. [2021-11-02 22:56:54,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:56:54,137 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 60 [2021-11-02 22:56:54,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:56:54,138 INFO L225 Difference]: With dead ends: 129 [2021-11-02 22:56:54,138 INFO L226 Difference]: Without dead ends: 129 [2021-11-02 22:56:54,139 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:56:54,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-02 22:56:54,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 127. [2021-11-02 22:56:54,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 105 states have (on average 1.2285714285714286) internal successors, (129), 114 states have internal predecessors, (129), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-02 22:56:54,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 145 transitions. [2021-11-02 22:56:54,144 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 145 transitions. Word has length 60 [2021-11-02 22:56:54,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:56:54,144 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 145 transitions. [2021-11-02 22:56:54,145 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:56:54,145 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 145 transitions. [2021-11-02 22:56:54,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-02 22:56:54,146 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:56:54,146 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:56:54,194 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-02 22:56:54,347 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:56:54,347 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting dll_remove_lastErr13REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:56:54,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:56:54,347 INFO L85 PathProgramCache]: Analyzing trace with hash 1108481324, now seen corresponding path program 1 times [2021-11-02 22:56:54,348 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:56:54,348 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [745851583] [2021-11-02 22:56:54,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:56:54,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:56:54,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:56:54,627 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:56:54,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:56:54,660 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:56:54,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:56:54,787 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-11-02 22:56:54,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:56:55,070 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 13 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:56:55,070 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:56:55,070 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [745851583] [2021-11-02 22:56:55,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [745851583] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:56:55,070 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2012092381] [2021-11-02 22:56:55,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:56:55,071 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:56:55,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:56:55,071 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:56:55,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-02 22:56:55,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:56:55,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-02 22:56:55,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:56:56,501 INFO L354 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-11-02 22:56:56,502 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 68 treesize of output 70 [2021-11-02 22:56:56,719 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 117 treesize of output 116 [2021-11-02 22:56:56,899 INFO L354 Elim1Store]: treesize reduction 55, result has 11.3 percent of original size [2021-11-02 22:56:56,900 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 2 case distinctions, treesize of input 71 treesize of output 47 [2021-11-02 22:56:57,205 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-02 22:56:57,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-11-02 22:56:57,520 INFO L354 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2021-11-02 22:56:57,520 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 78 treesize of output 41 [2021-11-02 22:56:57,525 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-02 22:56:57,525 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 35 treesize of output 20 [2021-11-02 22:56:57,576 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:56:57,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2012092381] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:56:57,576 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:56:57,576 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 24] total 44 [2021-11-02 22:56:57,576 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294274948] [2021-11-02 22:56:57,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-02 22:56:57,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:56:57,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-02 22:56:57,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1784, Unknown=0, NotChecked=0, Total=1892 [2021-11-02 22:56:57,578 INFO L87 Difference]: Start difference. First operand 127 states and 145 transitions. Second operand has 44 states, 42 states have (on average 2.3095238095238093) internal successors, (97), 36 states have internal predecessors, (97), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-02 22:57:02,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:57:02,292 INFO L93 Difference]: Finished difference Result 117 states and 121 transitions. [2021-11-02 22:57:02,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-02 22:57:02,293 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 42 states have (on average 2.3095238095238093) internal successors, (97), 36 states have internal predecessors, (97), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 62 [2021-11-02 22:57:02,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:57:02,294 INFO L225 Difference]: With dead ends: 117 [2021-11-02 22:57:02,294 INFO L226 Difference]: Without dead ends: 113 [2021-11-02 22:57:02,295 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 511 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=361, Invalid=3929, Unknown=0, NotChecked=0, Total=4290 [2021-11-02 22:57:02,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-02 22:57:02,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 107. [2021-11-02 22:57:02,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 87 states have (on average 1.1839080459770115) internal successors, (103), 96 states have internal predecessors, (103), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-02 22:57:02,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 115 transitions. [2021-11-02 22:57:02,299 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 115 transitions. Word has length 62 [2021-11-02 22:57:02,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:57:02,300 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 115 transitions. [2021-11-02 22:57:02,300 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 42 states have (on average 2.3095238095238093) internal successors, (97), 36 states have internal predecessors, (97), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-02 22:57:02,300 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 115 transitions. [2021-11-02 22:57:02,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-02 22:57:02,301 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:57:02,301 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:57:02,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-02 22:57:02,510 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-02 22:57:02,510 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting mainErr2ASSERT_VIOLATIONMEMORY_LEAK === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:57:02,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:57:02,510 INFO L85 PathProgramCache]: Analyzing trace with hash 17828144, now seen corresponding path program 1 times [2021-11-02 22:57:02,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:57:02,511 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559579126] [2021-11-02 22:57:02,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:57:02,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:57:02,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:02,585 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:57:02,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:02,601 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:57:02,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:02,623 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-11-02 22:57:02,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:02,630 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-11-02 22:57:02,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:02,666 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-02 22:57:02,667 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:57:02,667 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559579126] [2021-11-02 22:57:02,667 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [559579126] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:57:02,667 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:57:02,668 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-02 22:57:02,668 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302041121] [2021-11-02 22:57:02,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:57:02,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:57:02,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:57:02,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:57:02,672 INFO L87 Difference]: Start difference. First operand 107 states and 115 transitions. Second operand has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 6 states have internal predecessors, (50), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-02 22:57:03,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:57:03,178 INFO L93 Difference]: Finished difference Result 107 states and 115 transitions. [2021-11-02 22:57:03,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:57:03,179 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 6 states have internal predecessors, (50), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 67 [2021-11-02 22:57:03,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:57:03,180 INFO L225 Difference]: With dead ends: 107 [2021-11-02 22:57:03,180 INFO L226 Difference]: Without dead ends: 107 [2021-11-02 22:57:03,180 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:57:03,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-02 22:57:03,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 105. [2021-11-02 22:57:03,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 86 states have (on average 1.1744186046511629) internal successors, (101), 94 states have internal predecessors, (101), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-02 22:57:03,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 113 transitions. [2021-11-02 22:57:03,185 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 113 transitions. Word has length 67 [2021-11-02 22:57:03,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:57:03,185 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 113 transitions. [2021-11-02 22:57:03,186 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 6 states have internal predecessors, (50), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-02 22:57:03,186 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 113 transitions. [2021-11-02 22:57:03,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-02 22:57:03,187 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:57:03,187 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:57:03,187 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-11-02 22:57:03,187 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting mainErr3ENSURES_VIOLATIONMEMORY_LEAK === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:57:03,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:57:03,188 INFO L85 PathProgramCache]: Analyzing trace with hash 17828209, now seen corresponding path program 1 times [2021-11-02 22:57:03,188 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:57:03,188 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [801553921] [2021-11-02 22:57:03,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:57:03,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:57:03,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:03,537 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:57:03,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:03,563 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:57:03,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:04,135 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-11-02 22:57:04,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:04,763 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-11-02 22:57:04,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:05,057 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:57:05,057 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:57:05,057 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [801553921] [2021-11-02 22:57:05,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [801553921] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:57:05,057 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1229768905] [2021-11-02 22:57:05,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:57:05,058 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:57:05,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:57:05,059 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:57:05,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-02 22:57:06,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:06,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 105 conjunts are in the unsatisfiable core [2021-11-02 22:57:06,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:57:06,210 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 [2021-11-02 22:57:06,446 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 [2021-11-02 22:57:06,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:57:06,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-02 22:57:06,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:57:06,661 INFO L354 Elim1Store]: treesize reduction 68, result has 21.8 percent of original size [2021-11-02 22:57:06,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 75 treesize of output 56 [2021-11-02 22:57:06,757 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [dll_create_~head~0.offset] [2021-11-02 22:57:06,758 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:57:06,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2021-11-02 22:57:06,758 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964796524] [2021-11-02 22:57:06,758 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-02 22:57:06,758 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:57:06,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-02 22:57:06,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=1460, Unknown=0, NotChecked=0, Total=1560 [2021-11-02 22:57:06,760 INFO L87 Difference]: Start difference. First operand 105 states and 113 transitions. Second operand has 33 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 29 states have internal predecessors, (58), 4 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:57:09,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:57:09,261 INFO L93 Difference]: Finished difference Result 119 states and 126 transitions. [2021-11-02 22:57:09,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-02 22:57:09,262 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 29 states have internal predecessors, (58), 4 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 67 [2021-11-02 22:57:09,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:57:09,264 INFO L225 Difference]: With dead ends: 119 [2021-11-02 22:57:09,264 INFO L226 Difference]: Without dead ends: 116 [2021-11-02 22:57:09,265 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 481 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=248, Invalid=2722, Unknown=0, NotChecked=0, Total=2970 [2021-11-02 22:57:09,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-02 22:57:09,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 99. [2021-11-02 22:57:09,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 80 states have (on average 1.125) internal successors, (90), 87 states have internal predecessors, (90), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-02 22:57:09,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2021-11-02 22:57:09,270 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 67 [2021-11-02 22:57:09,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:57:09,271 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2021-11-02 22:57:09,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 29 states have internal predecessors, (58), 4 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:57:09,271 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2021-11-02 22:57:09,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-02 22:57:09,272 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:57:09,272 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:57:09,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-02 22:57:09,492 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-02 22:57:09,492 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting dll_remove_lastErr2REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-11-02 22:57:09,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:57:09,493 INFO L85 PathProgramCache]: Analyzing trace with hash 556285180, now seen corresponding path program 1 times [2021-11-02 22:57:09,493 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:57:09,493 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [770157801] [2021-11-02 22:57:09,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:57:09,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:57:09,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:09,569 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:57:09,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:09,587 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:57:09,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:09,612 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-11-02 22:57:09,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:09,621 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-11-02 22:57:09,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:09,630 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:57:09,630 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:57:09,630 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [770157801] [2021-11-02 22:57:09,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [770157801] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:57:09,631 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:57:09,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-02 22:57:09,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653283250] [2021-11-02 22:57:09,632 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:57:09,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:57:09,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:57:09,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:57:09,633 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand has 9 states, 9 states have (on average 5.222222222222222) internal successors, (47), 6 states have internal predecessors, (47), 5 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:57:09,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:57:09,828 INFO L93 Difference]: Finished difference Result 64 states and 63 transitions. [2021-11-02 22:57:09,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:57:09,828 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.222222222222222) internal successors, (47), 6 states have internal predecessors, (47), 5 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 68 [2021-11-02 22:57:09,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:57:09,829 INFO L225 Difference]: With dead ends: 64 [2021-11-02 22:57:09,829 INFO L226 Difference]: Without dead ends: 0 [2021-11-02 22:57:09,829 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:57:09,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-11-02 22:57:09,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-11-02 22:57:09,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:57:09,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-11-02 22:57:09,830 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 68 [2021-11-02 22:57:09,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:57:09,830 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-11-02 22:57:09,830 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.222222222222222) internal successors, (47), 6 states have internal predecessors, (47), 5 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:57:09,831 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-11-02 22:57:09,831 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-11-02 22:57:09,835 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr0REQUIRES_VIOLATION [2021-11-02 22:57:09,836 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr1REQUIRES_VIOLATION [2021-11-02 22:57:09,836 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr2REQUIRES_VIOLATION [2021-11-02 22:57:09,837 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr3REQUIRES_VIOLATION [2021-11-02 22:57:09,837 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr4REQUIRES_VIOLATION [2021-11-02 22:57:09,837 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr5REQUIRES_VIOLATION [2021-11-02 22:57:09,837 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr0REQUIRES_VIOLATION [2021-11-02 22:57:09,837 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr1REQUIRES_VIOLATION [2021-11-02 22:57:09,838 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr2REQUIRES_VIOLATION [2021-11-02 22:57:09,838 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr3REQUIRES_VIOLATION [2021-11-02 22:57:09,838 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr4REQUIRES_VIOLATION [2021-11-02 22:57:09,838 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr5REQUIRES_VIOLATION [2021-11-02 22:57:09,839 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr6ASSERT_VIOLATIONMEMORY_FREE [2021-11-02 22:57:09,839 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr7ASSERT_VIOLATIONMEMORY_FREE [2021-11-02 22:57:09,839 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr8ASSERT_VIOLATIONMEMORY_FREE [2021-11-02 22:57:09,839 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr9REQUIRES_VIOLATION [2021-11-02 22:57:09,840 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr10REQUIRES_VIOLATION [2021-11-02 22:57:09,840 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr11REQUIRES_VIOLATION [2021-11-02 22:57:09,840 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr12REQUIRES_VIOLATION [2021-11-02 22:57:09,840 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr13REQUIRES_VIOLATION [2021-11-02 22:57:09,840 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr14REQUIRES_VIOLATION [2021-11-02 22:57:09,841 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr15REQUIRES_VIOLATION [2021-11-02 22:57:09,841 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr16REQUIRES_VIOLATION [2021-11-02 22:57:09,841 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr17REQUIRES_VIOLATION [2021-11-02 22:57:09,841 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr18REQUIRES_VIOLATION [2021-11-02 22:57:09,842 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr19ASSERT_VIOLATIONMEMORY_FREE [2021-11-02 22:57:09,842 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr20ASSERT_VIOLATIONMEMORY_FREE [2021-11-02 22:57:09,842 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr21ASSERT_VIOLATIONMEMORY_FREE [2021-11-02 22:57:09,842 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr0REQUIRES_VIOLATION [2021-11-02 22:57:09,842 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr1REQUIRES_VIOLATION [2021-11-02 22:57:09,843 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr2ASSERT_VIOLATIONMEMORY_LEAK [2021-11-02 22:57:09,843 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr3ENSURES_VIOLATIONMEMORY_LEAK [2021-11-02 22:57:09,843 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr0REQUIRES_VIOLATION [2021-11-02 22:57:09,843 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr1REQUIRES_VIOLATION [2021-11-02 22:57:09,844 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr2REQUIRES_VIOLATION [2021-11-02 22:57:09,844 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr3REQUIRES_VIOLATION [2021-11-02 22:57:09,844 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr4REQUIRES_VIOLATION [2021-11-02 22:57:09,844 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr5REQUIRES_VIOLATION [2021-11-02 22:57:09,844 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr6REQUIRES_VIOLATION [2021-11-02 22:57:09,845 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr7REQUIRES_VIOLATION [2021-11-02 22:57:09,845 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-11-02 22:57:09,849 INFO L731 BasicCegarLoop]: Path program histogram: [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:57:09,852 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-02 22:57:09,857 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.11 10:57:09 BoogieIcfgContainer [2021-11-02 22:57:09,857 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-02 22:57:09,858 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-02 22:57:09,858 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-02 22:57:09,858 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-02 22:57:09,860 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:53:07" (3/4) ... [2021-11-02 22:57:09,863 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-11-02 22:57:09,875 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure reach_error [2021-11-02 22:57:09,876 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure dll_remove_last [2021-11-02 22:57:09,876 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2021-11-02 22:57:09,876 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure myexit [2021-11-02 22:57:09,876 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure dll_create [2021-11-02 22:57:09,876 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_32 [2021-11-02 22:57:09,877 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_64 [2021-11-02 22:57:09,877 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2021-11-02 22:57:09,877 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure node_create [2021-11-02 22:57:09,888 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 15 nodes and edges [2021-11-02 22:57:09,889 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2021-11-02 22:57:09,889 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2021-11-02 22:57:09,890 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-11-02 22:57:09,958 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/witness.graphml [2021-11-02 22:57:09,959 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-02 22:57:09,961 INFO L168 Benchmark]: Toolchain (without parser) took 244053.06 ms. Allocated memory was 96.5 MB in the beginning and 220.2 MB in the end (delta: 123.7 MB). Free memory was 61.6 MB in the beginning and 51.2 MB in the end (delta: 10.4 MB). Peak memory consumption was 134.4 MB. Max. memory is 16.1 GB. [2021-11-02 22:57:09,962 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 96.5 MB. Free memory is still 49.0 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-11-02 22:57:09,962 INFO L168 Benchmark]: CACSL2BoogieTranslator took 465.05 ms. Allocated memory was 96.5 MB in the beginning and 125.8 MB in the end (delta: 29.4 MB). Free memory was 61.6 MB in the beginning and 92.2 MB in the end (delta: -30.6 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2021-11-02 22:57:09,963 INFO L168 Benchmark]: Boogie Preprocessor took 60.86 ms. Allocated memory is still 125.8 MB. Free memory was 92.2 MB in the beginning and 89.4 MB in the end (delta: 2.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-02 22:57:09,963 INFO L168 Benchmark]: RCFGBuilder took 776.83 ms. Allocated memory is still 125.8 MB. Free memory was 89.4 MB in the beginning and 64.3 MB in the end (delta: 25.2 MB). Peak memory consumption was 25.2 MB. Max. memory is 16.1 GB. [2021-11-02 22:57:09,964 INFO L168 Benchmark]: TraceAbstraction took 242629.21 ms. Allocated memory was 125.8 MB in the beginning and 220.2 MB in the end (delta: 94.4 MB). Free memory was 64.3 MB in the beginning and 55.4 MB in the end (delta: 8.9 MB). Peak memory consumption was 105.7 MB. Max. memory is 16.1 GB. [2021-11-02 22:57:09,964 INFO L168 Benchmark]: Witness Printer took 101.10 ms. Allocated memory is still 220.2 MB. Free memory was 55.4 MB in the beginning and 51.2 MB in the end (delta: 4.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-11-02 22:57:09,967 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 96.5 MB. Free memory is still 49.0 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 465.05 ms. Allocated memory was 96.5 MB in the beginning and 125.8 MB in the end (delta: 29.4 MB). Free memory was 61.6 MB in the beginning and 92.2 MB in the end (delta: -30.6 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 60.86 ms. Allocated memory is still 125.8 MB. Free memory was 92.2 MB in the beginning and 89.4 MB in the end (delta: 2.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 776.83 ms. Allocated memory is still 125.8 MB. Free memory was 89.4 MB in the beginning and 64.3 MB in the end (delta: 25.2 MB). Peak memory consumption was 25.2 MB. Max. memory is 16.1 GB. * TraceAbstraction took 242629.21 ms. Allocated memory was 125.8 MB in the beginning and 220.2 MB in the end (delta: 94.4 MB). Free memory was 64.3 MB in the beginning and 55.4 MB in the end (delta: 8.9 MB). Peak memory consumption was 105.7 MB. Max. memory is 16.1 GB. * Witness Printer took 101.10 ms. Allocated memory is still 220.2 MB. Free memory was 55.4 MB in the beginning and 51.2 MB in the end (delta: 4.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 580]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 580]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 581]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 581]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 582]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 582]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 604]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 604]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 604]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 604]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 605]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 605]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 605]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 605]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 605]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 606]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 606]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 609]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 609]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 610]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 610]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 612]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 612]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 614]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 614]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 615]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 615]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 615]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 626]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 626]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 630]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 618]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 592]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 592]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 593]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 593]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 594]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 594]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 596]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 596]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 10 procedures, 113 locations, 40 error locations. Started 1 CEGAR loops. OverallTime: 242.5s, OverallIterations: 40, TraceHistogramMax: 3, PathProgramHistogramMax: 2, EmptinessCheckTime: 0.0s, AutomataDifference: 190.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 1628 SDtfs, 6629 SDslu, 7662 SDs, 0 SdLazy, 27849 SolverSat, 1130 SolverUnsat, 46 SolverUnknown, 0 SolverNotchecked, 53.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2052 GetRequests, 944 SyntacticMatches, 18 SemanticMatches, 1090 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 8899 ImplicationChecksByTransitivity, 151.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=156occurred in iteration=17, InterpolantAutomatonStates: 657, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 40 MinimizatonAttempts, 470 StatesRemovedByMinimization, 29 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.3s SsaConstructionTime, 1.3s SatisfiabilityAnalysisTime, 33.9s InterpolantComputationTime, 2501 NumberOfCodeBlocks, 2487 NumberOfCodeBlocksAsserted, 63 NumberOfCheckSat, 2440 ConstructedInterpolants, 144 QuantifiedInterpolants, 29419 SizeOfPredicates, 178 NumberOfNonLiveVariables, 5722 ConjunctsInSsa, 582 ConjunctsInUnsatCore, 61 InterpolantComputations, 19 PerfectInterpolantSequences, 424/736 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 40 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2021-11-02 22:57:10,216 WARN L435 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forcibly destroying the process [2021-11-02 22:57:10,276 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f55ba01-bdd6-45c9-8b2c-dec0538ed7be/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 137 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE