./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/dll2c_append_unequal.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/dll2c_append_unequal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 9aabbeff87ba819b44dc608a3105d0ba81b71cd88693ecf2e6bf3860a7863e64 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-13 18:47:19,844 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-13 18:47:19,847 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-13 18:47:19,884 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-13 18:47:19,885 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-13 18:47:19,887 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-13 18:47:19,889 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-13 18:47:19,892 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-13 18:47:19,895 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-13 18:47:19,897 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-13 18:47:19,898 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-13 18:47:19,900 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-13 18:47:19,901 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-13 18:47:19,902 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-13 18:47:19,904 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-13 18:47:19,907 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-13 18:47:19,908 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-13 18:47:19,910 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-13 18:47:19,913 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-13 18:47:19,916 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-13 18:47:19,918 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-13 18:47:19,920 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-13 18:47:19,925 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-13 18:47:19,926 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-13 18:47:19,931 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-13 18:47:19,935 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-13 18:47:19,936 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-13 18:47:19,937 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-13 18:47:19,942 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-13 18:47:19,943 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-13 18:47:19,945 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-13 18:47:19,946 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-13 18:47:19,948 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-13 18:47:19,949 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-13 18:47:19,951 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-13 18:47:19,952 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-13 18:47:19,953 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-13 18:47:19,953 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-13 18:47:19,954 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-13 18:47:19,955 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-13 18:47:19,956 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-13 18:47:19,957 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-11-13 18:47:20,005 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-13 18:47:20,006 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-13 18:47:20,007 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-13 18:47:20,007 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-13 18:47:20,014 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-13 18:47:20,014 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-13 18:47:20,015 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-13 18:47:20,015 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-13 18:47:20,015 INFO L138 SettingsManager]: * Use SBE=true [2021-11-13 18:47:20,015 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-13 18:47:20,016 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-13 18:47:20,016 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-13 18:47:20,016 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-13 18:47:20,016 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-13 18:47:20,016 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-13 18:47:20,016 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-13 18:47:20,017 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-13 18:47:20,017 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-13 18:47:20,017 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-13 18:47:20,017 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-13 18:47:20,018 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-13 18:47:20,018 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-13 18:47:20,018 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-13 18:47:20,018 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-13 18:47:20,018 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-13 18:47:20,019 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 18:47:20,019 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-13 18:47:20,019 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-13 18:47:20,019 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-13 18:47:20,019 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-13 18:47:20,020 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-13 18:47:20,020 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_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9aabbeff87ba819b44dc608a3105d0ba81b71cd88693ecf2e6bf3860a7863e64 [2021-11-13 18:47:20,326 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-13 18:47:20,364 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-13 18:47:20,367 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-13 18:47:20,368 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-13 18:47:20,369 INFO L275 PluginConnector]: CDTParser initialized [2021-11-13 18:47:20,371 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/../../sv-benchmarks/c/list-simple/dll2c_append_unequal.i [2021-11-13 18:47:20,470 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/data/d018ae612/bc079e7235b34ebdac53bdf48ae89fe6/FLAG6241b23c4 [2021-11-13 18:47:21,160 INFO L306 CDTParser]: Found 1 translation units. [2021-11-13 18:47:21,161 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/sv-benchmarks/c/list-simple/dll2c_append_unequal.i [2021-11-13 18:47:21,193 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/data/d018ae612/bc079e7235b34ebdac53bdf48ae89fe6/FLAG6241b23c4 [2021-11-13 18:47:21,388 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/data/d018ae612/bc079e7235b34ebdac53bdf48ae89fe6 [2021-11-13 18:47:21,397 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-13 18:47:21,399 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-13 18:47:21,401 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-13 18:47:21,401 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-13 18:47:21,405 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-13 18:47:21,405 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 06:47:21" (1/1) ... [2021-11-13 18:47:21,407 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@701fce2a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:47:21, skipping insertion in model container [2021-11-13 18:47:21,407 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 06:47:21" (1/1) ... [2021-11-13 18:47:21,416 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-13 18:47:21,468 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-13 18:47:21,967 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_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/sv-benchmarks/c/list-simple/dll2c_append_unequal.i[24672,24685] [2021-11-13 18:47:21,974 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 18:47:21,992 INFO L203 MainTranslator]: Completed pre-run [2021-11-13 18:47:22,087 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_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/sv-benchmarks/c/list-simple/dll2c_append_unequal.i[24672,24685] [2021-11-13 18:47:22,088 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 18:47:22,132 INFO L208 MainTranslator]: Completed translation [2021-11-13 18:47:22,135 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:47:22 WrapperNode [2021-11-13 18:47:22,135 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-13 18:47:22,137 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-13 18:47:22,137 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-13 18:47:22,137 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-13 18:47:22,151 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:47:22" (1/1) ... [2021-11-13 18:47:22,151 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:47:22" (1/1) ... [2021-11-13 18:47:22,168 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:47:22" (1/1) ... [2021-11-13 18:47:22,169 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:47:22" (1/1) ... [2021-11-13 18:47:22,193 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:47:22" (1/1) ... [2021-11-13 18:47:22,209 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:47:22" (1/1) ... [2021-11-13 18:47:22,223 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:47:22" (1/1) ... [2021-11-13 18:47:22,240 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-13 18:47:22,252 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-13 18:47:22,253 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-13 18:47:22,253 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-13 18:47:22,254 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:47:22" (1/1) ... [2021-11-13 18:47:22,263 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 18:47:22,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:47:22,295 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-13 18:47:22,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-13 18:47:22,346 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-13 18:47:22,347 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-13 18:47:22,347 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-11-13 18:47:22,349 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-13 18:47:22,349 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-13 18:47:22,349 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2021-11-13 18:47:22,349 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-11-13 18:47:22,350 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_circular_create [2021-11-13 18:47:22,350 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_circular_destroy [2021-11-13 18:47:22,351 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_circular_append [2021-11-13 18:47:22,351 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-13 18:47:22,351 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-13 18:47:22,351 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-11-13 18:47:22,351 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-11-13 18:47:22,352 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-11-13 18:47:22,352 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-11-13 18:47:22,352 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-13 18:47:22,352 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-13 18:47:22,352 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-13 18:47:22,352 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-13 18:47:22,353 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-13 18:47:22,353 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-13 18:47:22,353 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-13 18:47:22,353 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-13 18:47:22,353 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-13 18:47:22,354 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-13 18:47:22,354 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-13 18:47:22,354 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-13 18:47:22,354 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-13 18:47:22,354 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-13 18:47:22,354 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-13 18:47:22,355 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-13 18:47:22,355 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-13 18:47:22,355 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-13 18:47:22,355 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-13 18:47:22,355 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-13 18:47:22,355 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-13 18:47:22,356 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-13 18:47:22,356 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-13 18:47:22,356 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-13 18:47:22,356 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-13 18:47:22,356 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-13 18:47:22,356 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-13 18:47:22,357 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-13 18:47:22,357 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-13 18:47:22,357 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-13 18:47:22,357 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-13 18:47:22,358 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-13 18:47:22,359 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-13 18:47:22,359 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-13 18:47:22,359 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-13 18:47:22,359 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-13 18:47:22,360 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-13 18:47:22,360 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-13 18:47:22,360 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-13 18:47:22,360 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-13 18:47:22,360 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-13 18:47:22,361 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-13 18:47:22,361 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-13 18:47:22,361 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-13 18:47:22,362 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-13 18:47:22,362 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-13 18:47:22,362 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-13 18:47:22,362 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-13 18:47:22,364 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-13 18:47:22,364 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-13 18:47:22,365 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-13 18:47:22,366 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-13 18:47:22,366 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-13 18:47:22,366 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-13 18:47:22,366 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-13 18:47:22,366 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-13 18:47:22,367 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-13 18:47:22,367 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2021-11-13 18:47:22,367 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-13 18:47:22,367 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-13 18:47:22,367 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-13 18:47:22,368 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-11-13 18:47:22,368 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-13 18:47:22,368 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-11-13 18:47:22,369 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-13 18:47:22,369 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-13 18:47:22,369 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-11-13 18:47:22,370 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-13 18:47:22,370 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-13 18:47:22,370 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-13 18:47:22,370 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-13 18:47:22,370 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-13 18:47:22,370 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-13 18:47:22,371 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-13 18:47:22,371 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-13 18:47:22,371 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-13 18:47:22,371 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-13 18:47:22,371 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-13 18:47:22,371 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-13 18:47:22,372 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-13 18:47:22,372 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-13 18:47:22,372 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-13 18:47:22,372 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-13 18:47:22,372 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-13 18:47:22,372 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-13 18:47:22,372 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-13 18:47:22,373 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-13 18:47:22,373 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-13 18:47:22,373 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-13 18:47:22,374 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-13 18:47:22,374 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-13 18:47:22,375 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-13 18:47:22,375 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-13 18:47:22,375 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-13 18:47:22,375 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-13 18:47:22,375 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-13 18:47:22,376 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-13 18:47:22,376 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-13 18:47:22,376 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-13 18:47:22,376 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-13 18:47:22,376 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-13 18:47:22,376 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-13 18:47:22,376 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-13 18:47:22,377 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-13 18:47:22,377 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-13 18:47:22,377 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2021-11-13 18:47:22,377 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-11-13 18:47:22,378 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-13 18:47:22,379 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-13 18:47:22,379 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-13 18:47:22,383 INFO L130 BoogieDeclarations]: Found specification of procedure dll_circular_create [2021-11-13 18:47:22,383 INFO L130 BoogieDeclarations]: Found specification of procedure dll_circular_destroy [2021-11-13 18:47:22,383 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-13 18:47:22,383 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-13 18:47:22,384 INFO L130 BoogieDeclarations]: Found specification of procedure dll_circular_append [2021-11-13 18:47:22,385 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-13 18:47:22,385 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-13 18:47:22,386 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-13 18:47:22,386 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-13 18:47:22,391 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-13 18:47:22,392 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-13 18:47:22,962 INFO L766 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2021-11-13 18:47:23,282 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-13 18:47:23,282 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-13 18:47:23,285 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 06:47:23 BoogieIcfgContainer [2021-11-13 18:47:23,285 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-13 18:47:23,287 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-13 18:47:23,287 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-13 18:47:23,292 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-13 18:47:23,292 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.11 06:47:21" (1/3) ... [2021-11-13 18:47:23,293 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3863c1b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 06:47:23, skipping insertion in model container [2021-11-13 18:47:23,293 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:47:22" (2/3) ... [2021-11-13 18:47:23,294 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3863c1b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 06:47:23, skipping insertion in model container [2021-11-13 18:47:23,294 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 06:47:23" (3/3) ... [2021-11-13 18:47:23,295 INFO L111 eAbstractionObserver]: Analyzing ICFG dll2c_append_unequal.i [2021-11-13 18:47:23,302 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-13 18:47:23,302 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 64 error locations. [2021-11-13 18:47:23,360 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-13 18:47:23,368 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 [2021-11-13 18:47:23,369 INFO L340 AbstractCegarLoop]: Starting to check reachability of 64 error locations. [2021-11-13 18:47:23,390 INFO L276 IsEmpty]: Start isEmpty. Operand has 155 states, 75 states have (on average 2.026666666666667) internal successors, (152), 139 states have internal predecessors, (152), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-13 18:47:23,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-13 18:47:23,400 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:23,401 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:23,402 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:23,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:23,408 INFO L85 PathProgramCache]: Analyzing trace with hash -1806807735, now seen corresponding path program 1 times [2021-11-13 18:47:23,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:23,419 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [98207479] [2021-11-13 18:47:23,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:23,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:23,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:23,654 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:23,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:23,672 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:47:23,673 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:23,673 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [98207479] [2021-11-13 18:47:23,674 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [98207479] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:47:23,675 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:47:23,675 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-13 18:47:23,677 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528362058] [2021-11-13 18:47:23,678 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:47:23,684 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-13 18:47:23,684 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:23,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-13 18:47:23,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-13 18:47:23,747 INFO L87 Difference]: Start difference. First operand has 155 states, 75 states have (on average 2.026666666666667) internal successors, (152), 139 states have internal predecessors, (152), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 18:47:24,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:47:24,192 INFO L93 Difference]: Finished difference Result 171 states and 182 transitions. [2021-11-13 18:47:24,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-13 18:47:24,195 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-13 18:47:24,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:47:24,209 INFO L225 Difference]: With dead ends: 171 [2021-11-13 18:47:24,209 INFO L226 Difference]: Without dead ends: 165 [2021-11-13 18:47:24,211 INFO L932 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 [2021-11-13 18:47:24,216 INFO L933 BasicCegarLoop]: 140 mSDtfsCounter, 37 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 309.62ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 12.01ms SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 376.12ms IncrementalHoareTripleChecker+Time [2021-11-13 18:47:24,218 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 209 Invalid, 256 Unknown, 0 Unchecked, 12.01ms Time], IncrementalHoareTripleChecker [10 Valid, 246 Invalid, 0 Unknown, 0 Unchecked, 376.12ms Time] [2021-11-13 18:47:24,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-11-13 18:47:24,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 146. [2021-11-13 18:47:24,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 72 states have (on average 1.9444444444444444) internal successors, (140), 132 states have internal predecessors, (140), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:47:24,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 155 transitions. [2021-11-13 18:47:24,276 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 155 transitions. Word has length 12 [2021-11-13 18:47:24,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:47:24,277 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 155 transitions. [2021-11-13 18:47:24,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 18:47:24,277 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 155 transitions. [2021-11-13 18:47:24,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-13 18:47:24,278 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:24,279 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:24,279 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-13 18:47:24,279 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:24,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:24,281 INFO L85 PathProgramCache]: Analyzing trace with hash -1806807734, now seen corresponding path program 1 times [2021-11-13 18:47:24,281 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:24,281 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [883896721] [2021-11-13 18:47:24,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:24,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:24,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:24,436 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:24,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:24,475 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:47:24,475 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:24,475 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [883896721] [2021-11-13 18:47:24,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [883896721] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:47:24,477 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:47:24,477 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-13 18:47:24,477 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632071689] [2021-11-13 18:47:24,477 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:47:24,479 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-13 18:47:24,480 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:24,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-13 18:47:24,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-13 18:47:24,482 INFO L87 Difference]: Start difference. First operand 146 states and 155 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 18:47:24,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:47:24,860 INFO L93 Difference]: Finished difference Result 162 states and 172 transitions. [2021-11-13 18:47:24,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-13 18:47:24,861 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-13 18:47:24,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:47:24,864 INFO L225 Difference]: With dead ends: 162 [2021-11-13 18:47:24,864 INFO L226 Difference]: Without dead ends: 162 [2021-11-13 18:47:24,864 INFO L932 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 [2021-11-13 18:47:24,866 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 31 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 264.67ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.00ms SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 329.05ms IncrementalHoareTripleChecker+Time [2021-11-13 18:47:24,867 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 201 Invalid, 240 Unknown, 0 Unchecked, 8.00ms Time], IncrementalHoareTripleChecker [9 Valid, 231 Invalid, 0 Unknown, 0 Unchecked, 329.05ms Time] [2021-11-13 18:47:24,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-11-13 18:47:24,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 143. [2021-11-13 18:47:24,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 72 states have (on average 1.9027777777777777) internal successors, (137), 129 states have internal predecessors, (137), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:47:24,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 152 transitions. [2021-11-13 18:47:24,881 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 152 transitions. Word has length 12 [2021-11-13 18:47:24,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:47:24,882 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 152 transitions. [2021-11-13 18:47:24,882 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 18:47:24,883 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 152 transitions. [2021-11-13 18:47:24,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-13 18:47:24,884 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:24,884 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:24,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-13 18:47:24,884 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting dll_circular_createErr4REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:24,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:24,885 INFO L85 PathProgramCache]: Analyzing trace with hash 1555459975, now seen corresponding path program 1 times [2021-11-13 18:47:24,886 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:24,886 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [185301861] [2021-11-13 18:47:24,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:24,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:24,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:24,979 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:24,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:25,006 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-13 18:47:25,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:25,027 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:47:25,027 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:25,027 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [185301861] [2021-11-13 18:47:25,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [185301861] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:47:25,028 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:47:25,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-13 18:47:25,029 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658112014] [2021-11-13 18:47:25,029 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:47:25,030 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-13 18:47:25,030 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:25,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-13 18:47:25,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-13 18:47:25,031 INFO L87 Difference]: Start difference. First operand 143 states and 152 transitions. Second operand has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 3 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 18:47:25,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:47:25,566 INFO L93 Difference]: Finished difference Result 173 states and 185 transitions. [2021-11-13 18:47:25,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-13 18:47:25,567 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 3 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-11-13 18:47:25,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:47:25,569 INFO L225 Difference]: With dead ends: 173 [2021-11-13 18:47:25,569 INFO L226 Difference]: Without dead ends: 173 [2021-11-13 18:47:25,570 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-11-13 18:47:25,571 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 129 mSDsluCounter, 324 mSDsCounter, 0 mSdLazyCounter, 357 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 300.20ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 458 SdHoareTripleChecker+Invalid, 377 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.61ms SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 375.63ms IncrementalHoareTripleChecker+Time [2021-11-13 18:47:25,572 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [134 Valid, 458 Invalid, 377 Unknown, 0 Unchecked, 9.61ms Time], IncrementalHoareTripleChecker [20 Valid, 357 Invalid, 0 Unknown, 0 Unchecked, 375.63ms Time] [2021-11-13 18:47:25,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-11-13 18:47:25,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 144. [2021-11-13 18:47:25,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 73 states have (on average 1.8904109589041096) internal successors, (138), 130 states have internal predecessors, (138), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:47:25,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 153 transitions. [2021-11-13 18:47:25,613 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 153 transitions. Word has length 20 [2021-11-13 18:47:25,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:47:25,614 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 153 transitions. [2021-11-13 18:47:25,614 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 3 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 18:47:25,615 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 153 transitions. [2021-11-13 18:47:25,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-13 18:47:25,616 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:25,617 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:25,617 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-13 18:47:25,618 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting dll_circular_createErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:25,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:25,619 INFO L85 PathProgramCache]: Analyzing trace with hash 1304508402, now seen corresponding path program 1 times [2021-11-13 18:47:25,619 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:25,620 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805404592] [2021-11-13 18:47:25,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:25,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:25,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:25,756 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:25,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:25,777 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-13 18:47:25,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:25,788 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-13 18:47:25,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:25,849 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-13 18:47:25,849 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:25,850 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [805404592] [2021-11-13 18:47:25,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [805404592] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:47:25,850 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:47:25,851 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-13 18:47:25,851 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560966366] [2021-11-13 18:47:25,851 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:47:25,852 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-13 18:47:25,852 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:25,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-13 18:47:25,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-13 18:47:25,853 INFO L87 Difference]: Start difference. First operand 144 states and 153 transitions. Second operand has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-13 18:47:26,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:47:26,384 INFO L93 Difference]: Finished difference Result 163 states and 174 transitions. [2021-11-13 18:47:26,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-13 18:47:26,385 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 30 [2021-11-13 18:47:26,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:47:26,388 INFO L225 Difference]: With dead ends: 163 [2021-11-13 18:47:26,388 INFO L226 Difference]: Without dead ends: 163 [2021-11-13 18:47:26,389 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-13 18:47:26,402 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 73 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 629 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 384.60ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 383 SdHoareTripleChecker+Invalid, 643 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.09ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 629 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 459.87ms IncrementalHoareTripleChecker+Time [2021-11-13 18:47:26,404 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 383 Invalid, 643 Unknown, 0 Unchecked, 9.09ms Time], IncrementalHoareTripleChecker [14 Valid, 629 Invalid, 0 Unknown, 0 Unchecked, 459.87ms Time] [2021-11-13 18:47:26,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-11-13 18:47:26,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 143. [2021-11-13 18:47:26,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 73 states have (on average 1.8767123287671232) internal successors, (137), 129 states have internal predecessors, (137), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:47:26,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 152 transitions. [2021-11-13 18:47:26,424 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 152 transitions. Word has length 30 [2021-11-13 18:47:26,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:47:26,424 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 152 transitions. [2021-11-13 18:47:26,425 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-13 18:47:26,425 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 152 transitions. [2021-11-13 18:47:26,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-13 18:47:26,427 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:26,427 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:26,428 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-13 18:47:26,428 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting dll_circular_createErr1REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:26,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:26,429 INFO L85 PathProgramCache]: Analyzing trace with hash 1304508403, now seen corresponding path program 1 times [2021-11-13 18:47:26,429 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:26,429 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [635918427] [2021-11-13 18:47:26,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:26,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:26,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:26,583 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:26,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:26,611 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-13 18:47:26,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:26,637 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-13 18:47:26,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:26,699 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 18:47:26,700 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:26,700 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [635918427] [2021-11-13 18:47:26,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [635918427] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:47:26,700 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:47:26,701 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-13 18:47:26,701 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030382988] [2021-11-13 18:47:26,701 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:47:26,701 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-13 18:47:26,702 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:26,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-13 18:47:26,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-13 18:47:26,703 INFO L87 Difference]: Start difference. First operand 143 states and 152 transitions. Second operand has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-13 18:47:27,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:47:27,276 INFO L93 Difference]: Finished difference Result 162 states and 173 transitions. [2021-11-13 18:47:27,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-13 18:47:27,276 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 30 [2021-11-13 18:47:27,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:47:27,278 INFO L225 Difference]: With dead ends: 162 [2021-11-13 18:47:27,279 INFO L226 Difference]: Without dead ends: 162 [2021-11-13 18:47:27,279 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-13 18:47:27,281 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 71 mSDsluCounter, 265 mSDsCounter, 0 mSdLazyCounter, 615 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 387.13ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 391 SdHoareTripleChecker+Invalid, 628 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.95ms SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 615 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 505.81ms IncrementalHoareTripleChecker+Time [2021-11-13 18:47:27,281 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 391 Invalid, 628 Unknown, 0 Unchecked, 8.95ms Time], IncrementalHoareTripleChecker [13 Valid, 615 Invalid, 0 Unknown, 0 Unchecked, 505.81ms Time] [2021-11-13 18:47:27,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-11-13 18:47:27,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 142. [2021-11-13 18:47:27,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 73 states have (on average 1.8630136986301369) internal successors, (136), 128 states have internal predecessors, (136), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:47:27,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 151 transitions. [2021-11-13 18:47:27,295 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 151 transitions. Word has length 30 [2021-11-13 18:47:27,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:47:27,296 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 151 transitions. [2021-11-13 18:47:27,296 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-13 18:47:27,297 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 151 transitions. [2021-11-13 18:47:27,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-13 18:47:27,298 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:27,298 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:27,298 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-13 18:47:27,299 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting dll_circular_createErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:27,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:27,299 INFO L85 PathProgramCache]: Analyzing trace with hash -497876237, now seen corresponding path program 1 times [2021-11-13 18:47:27,300 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:27,300 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712547280] [2021-11-13 18:47:27,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:27,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:27,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:27,383 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:27,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:27,402 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-13 18:47:27,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:27,454 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-13 18:47:27,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:27,559 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 18:47:27,559 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:27,560 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1712547280] [2021-11-13 18:47:27,560 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1712547280] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:47:27,560 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [212672493] [2021-11-13 18:47:27,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:27,561 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:47:27,561 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:47:27,563 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:47:27,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-13 18:47:27,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:27,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-13 18:47:27,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:47:27,857 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 [2021-11-13 18:47:28,268 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-13 18:47:28,269 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 [2021-11-13 18:47:28,429 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:47:28,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:47:28,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [212672493] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:47:28,521 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:47:28,521 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2021-11-13 18:47:28,521 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317872878] [2021-11-13 18:47:28,522 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:47:28,522 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-13 18:47:28,522 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:28,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-13 18:47:28,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-11-13 18:47:28,523 INFO L87 Difference]: Start difference. First operand 142 states and 151 transitions. Second operand has 13 states, 12 states have (on average 3.25) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-13 18:47:29,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:47:29,441 INFO L93 Difference]: Finished difference Result 166 states and 179 transitions. [2021-11-13 18:47:29,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-13 18:47:29,442 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 3.25) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2021-11-13 18:47:29,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:47:29,444 INFO L225 Difference]: With dead ends: 166 [2021-11-13 18:47:29,444 INFO L226 Difference]: Without dead ends: 166 [2021-11-13 18:47:29,445 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2021-11-13 18:47:29,446 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 106 mSDsluCounter, 361 mSDsCounter, 0 mSdLazyCounter, 803 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 584.56ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 460 SdHoareTripleChecker+Invalid, 896 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 11.50ms SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 803 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 72 IncrementalHoareTripleChecker+Unchecked, 724.80ms IncrementalHoareTripleChecker+Time [2021-11-13 18:47:29,446 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 460 Invalid, 896 Unknown, 0 Unchecked, 11.50ms Time], IncrementalHoareTripleChecker [21 Valid, 803 Invalid, 0 Unknown, 72 Unchecked, 724.80ms Time] [2021-11-13 18:47:29,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-11-13 18:47:29,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 147. [2021-11-13 18:47:29,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 77 states have (on average 1.844155844155844) internal successors, (142), 132 states have internal predecessors, (142), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-13 18:47:29,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 159 transitions. [2021-11-13 18:47:29,456 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 159 transitions. Word has length 32 [2021-11-13 18:47:29,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:47:29,457 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 159 transitions. [2021-11-13 18:47:29,457 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 3.25) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-13 18:47:29,457 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 159 transitions. [2021-11-13 18:47:29,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-13 18:47:29,458 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:29,459 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:29,498 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-13 18:47:29,685 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:47:29,685 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting dll_circular_createErr3REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:29,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:29,686 INFO L85 PathProgramCache]: Analyzing trace with hash -497876236, now seen corresponding path program 1 times [2021-11-13 18:47:29,686 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:29,686 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962494316] [2021-11-13 18:47:29,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:29,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:29,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:29,846 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:29,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:29,871 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-13 18:47:29,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:29,966 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-13 18:47:29,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:30,060 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 18:47:30,060 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:30,060 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [962494316] [2021-11-13 18:47:30,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [962494316] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:47:30,061 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1864879410] [2021-11-13 18:47:30,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:30,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:47:30,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:47:30,065 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:47:30,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-13 18:47:30,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:30,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-13 18:47:30,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:47:30,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-13 18:47:30,250 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 [2021-11-13 18:47:30,579 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-13 18:47:30,579 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 [2021-11-13 18:47:30,588 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-13 18:47:30,589 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 [2021-11-13 18:47:30,695 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:47:30,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:47:30,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1864879410] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:47:30,845 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:47:30,845 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 14 [2021-11-13 18:47:30,846 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080475247] [2021-11-13 18:47:30,846 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:47:30,846 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-13 18:47:30,847 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:30,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-13 18:47:30,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2021-11-13 18:47:30,850 INFO L87 Difference]: Start difference. First operand 147 states and 159 transitions. Second operand has 15 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 11 states have internal predecessors, (39), 2 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-13 18:47:31,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:47:31,840 INFO L93 Difference]: Finished difference Result 166 states and 178 transitions. [2021-11-13 18:47:31,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-13 18:47:31,840 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 11 states have internal predecessors, (39), 2 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2021-11-13 18:47:31,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:47:31,842 INFO L225 Difference]: With dead ends: 166 [2021-11-13 18:47:31,843 INFO L226 Difference]: Without dead ends: 166 [2021-11-13 18:47:31,843 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2021-11-13 18:47:31,844 INFO L933 BasicCegarLoop]: 101 mSDtfsCounter, 129 mSDsluCounter, 306 mSDsCounter, 0 mSdLazyCounter, 794 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 626.73ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 407 SdHoareTripleChecker+Invalid, 908 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 13.96ms SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 794 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 90 IncrementalHoareTripleChecker+Unchecked, 750.48ms IncrementalHoareTripleChecker+Time [2021-11-13 18:47:31,844 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 407 Invalid, 908 Unknown, 0 Unchecked, 13.96ms Time], IncrementalHoareTripleChecker [24 Valid, 794 Invalid, 0 Unknown, 90 Unchecked, 750.48ms Time] [2021-11-13 18:47:31,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-11-13 18:47:31,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 147. [2021-11-13 18:47:31,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 77 states have (on average 1.8311688311688312) internal successors, (141), 132 states have internal predecessors, (141), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-13 18:47:31,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 158 transitions. [2021-11-13 18:47:31,853 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 158 transitions. Word has length 32 [2021-11-13 18:47:31,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:47:31,853 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 158 transitions. [2021-11-13 18:47:31,853 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 11 states have internal predecessors, (39), 2 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-13 18:47:31,854 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 158 transitions. [2021-11-13 18:47:31,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-13 18:47:31,855 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:31,855 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:31,904 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-13 18:47:32,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-13 18:47:32,072 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting dll_circular_createErr4REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:32,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:32,073 INFO L85 PathProgramCache]: Analyzing trace with hash -1717539607, now seen corresponding path program 1 times [2021-11-13 18:47:32,073 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:32,073 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165593167] [2021-11-13 18:47:32,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:32,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:32,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:32,145 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:32,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:32,166 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-13 18:47:32,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:32,218 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-13 18:47:32,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:32,231 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 18:47:32,231 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:32,231 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165593167] [2021-11-13 18:47:32,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [165593167] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:47:32,231 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [740196726] [2021-11-13 18:47:32,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:32,232 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:47:32,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:47:32,233 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:47:32,246 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-13 18:47:32,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:32,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-13 18:47:32,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:47:32,546 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 18:47:32,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:47:32,715 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 18:47:32,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [740196726] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:47:32,716 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 18:47:32,716 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6] total 8 [2021-11-13 18:47:32,716 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565660886] [2021-11-13 18:47:32,716 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 18:47:32,718 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-13 18:47:32,718 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:32,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-13 18:47:32,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-13 18:47:32,719 INFO L87 Difference]: Start difference. First operand 147 states and 158 transitions. Second operand has 8 states, 8 states have (on average 3.625) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-13 18:47:33,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:47:33,198 INFO L93 Difference]: Finished difference Result 167 states and 178 transitions. [2021-11-13 18:47:33,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-13 18:47:33,199 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 34 [2021-11-13 18:47:33,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:47:33,200 INFO L225 Difference]: With dead ends: 167 [2021-11-13 18:47:33,200 INFO L226 Difference]: Without dead ends: 167 [2021-11-13 18:47:33,201 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 68 SyntacticMatches, 5 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-13 18:47:33,201 INFO L933 BasicCegarLoop]: 129 mSDtfsCounter, 56 mSDsluCounter, 468 mSDsCounter, 0 mSdLazyCounter, 414 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 334.17ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 597 SdHoareTripleChecker+Invalid, 429 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.08ms SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 405.96ms IncrementalHoareTripleChecker+Time [2021-11-13 18:47:33,202 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 597 Invalid, 429 Unknown, 0 Unchecked, 8.08ms Time], IncrementalHoareTripleChecker [15 Valid, 414 Invalid, 0 Unknown, 0 Unchecked, 405.96ms Time] [2021-11-13 18:47:33,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-13 18:47:33,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 147. [2021-11-13 18:47:33,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 77 states have (on average 1.8181818181818181) internal successors, (140), 132 states have internal predecessors, (140), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-13 18:47:33,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 157 transitions. [2021-11-13 18:47:33,208 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 157 transitions. Word has length 34 [2021-11-13 18:47:33,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:47:33,208 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 157 transitions. [2021-11-13 18:47:33,209 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-13 18:47:33,214 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 157 transitions. [2021-11-13 18:47:33,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-13 18:47:33,218 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:33,219 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:33,261 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-13 18:47:33,419 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-13 18:47:33,419 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting dll_circular_createErr4REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:33,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:33,420 INFO L85 PathProgramCache]: Analyzing trace with hash -1708900923, now seen corresponding path program 1 times [2021-11-13 18:47:33,420 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:33,420 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [68497665] [2021-11-13 18:47:33,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:33,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:33,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:33,485 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:33,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:33,507 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-13 18:47:33,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:33,521 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-13 18:47:33,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:33,533 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-13 18:47:33,533 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:33,534 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [68497665] [2021-11-13 18:47:33,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [68497665] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:47:33,534 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [448178750] [2021-11-13 18:47:33,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:33,534 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:47:33,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:47:33,541 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:47:33,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-13 18:47:33,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:33,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-13 18:47:33,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:47:33,825 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-13 18:47:33,825 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:47:33,846 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-11-13 18:47:33,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 11 [2021-11-13 18:47:33,919 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-13 18:47:33,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [448178750] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:47:33,920 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 18:47:33,920 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 3, 3] total 6 [2021-11-13 18:47:33,920 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474413486] [2021-11-13 18:47:33,920 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 18:47:33,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-13 18:47:33,922 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:33,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-13 18:47:33,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-13 18:47:33,924 INFO L87 Difference]: Start difference. First operand 147 states and 157 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-13 18:47:34,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:47:34,374 INFO L93 Difference]: Finished difference Result 171 states and 184 transitions. [2021-11-13 18:47:34,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-13 18:47:34,375 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 35 [2021-11-13 18:47:34,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:47:34,377 INFO L225 Difference]: With dead ends: 171 [2021-11-13 18:47:34,377 INFO L226 Difference]: Without dead ends: 171 [2021-11-13 18:47:34,377 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-13 18:47:34,378 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 65 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 435 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 317.47ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 455 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.36ms SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 435 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 393.77ms IncrementalHoareTripleChecker+Time [2021-11-13 18:47:34,379 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 289 Invalid, 455 Unknown, 0 Unchecked, 6.36ms Time], IncrementalHoareTripleChecker [20 Valid, 435 Invalid, 0 Unknown, 0 Unchecked, 393.77ms Time] [2021-11-13 18:47:34,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-11-13 18:47:34,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 150. [2021-11-13 18:47:34,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 80 states have (on average 1.8125) internal successors, (145), 135 states have internal predecessors, (145), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-13 18:47:34,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 162 transitions. [2021-11-13 18:47:34,386 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 162 transitions. Word has length 35 [2021-11-13 18:47:34,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:47:34,386 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 162 transitions. [2021-11-13 18:47:34,387 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-13 18:47:34,387 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 162 transitions. [2021-11-13 18:47:34,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-13 18:47:34,388 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:34,388 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:34,431 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-13 18:47:34,605 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:47:34,605 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting dll_circular_createErr5REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:34,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:34,606 INFO L85 PathProgramCache]: Analyzing trace with hash -1708900922, now seen corresponding path program 1 times [2021-11-13 18:47:34,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:34,606 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1959291171] [2021-11-13 18:47:34,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:34,607 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:34,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:34,719 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:34,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:34,738 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-13 18:47:34,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:34,791 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-13 18:47:34,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:34,803 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 18:47:34,804 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:34,804 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1959291171] [2021-11-13 18:47:34,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1959291171] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:47:34,804 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [883478441] [2021-11-13 18:47:34,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:34,804 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:47:34,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:47:34,817 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:47:34,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-13 18:47:34,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:34,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-13 18:47:34,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:47:35,177 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 18:47:35,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:47:35,233 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 18:47:35,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 23 [2021-11-13 18:47:35,421 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 18:47:35,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [883478441] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:47:35,422 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 18:47:35,422 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 16 [2021-11-13 18:47:35,422 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272693825] [2021-11-13 18:47:35,423 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 18:47:35,423 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-13 18:47:35,423 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:35,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-13 18:47:35,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=231, Unknown=0, NotChecked=0, Total=272 [2021-11-13 18:47:35,424 INFO L87 Difference]: Start difference. First operand 150 states and 162 transitions. Second operand has 17 states, 16 states have (on average 3.375) internal successors, (54), 13 states have internal predecessors, (54), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-13 18:47:36,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:47:36,113 INFO L93 Difference]: Finished difference Result 176 states and 189 transitions. [2021-11-13 18:47:36,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-13 18:47:36,114 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 3.375) internal successors, (54), 13 states have internal predecessors, (54), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) Word has length 35 [2021-11-13 18:47:36,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:47:36,115 INFO L225 Difference]: With dead ends: 176 [2021-11-13 18:47:36,116 INFO L226 Difference]: Without dead ends: 176 [2021-11-13 18:47:36,116 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=320, Unknown=0, NotChecked=0, Total=380 [2021-11-13 18:47:36,117 INFO L933 BasicCegarLoop]: 129 mSDtfsCounter, 73 mSDsluCounter, 749 mSDsCounter, 0 mSdLazyCounter, 759 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 496.95ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 878 SdHoareTripleChecker+Invalid, 778 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 13.21ms SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 759 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 594.77ms IncrementalHoareTripleChecker+Time [2021-11-13 18:47:36,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 878 Invalid, 778 Unknown, 0 Unchecked, 13.21ms Time], IncrementalHoareTripleChecker [19 Valid, 759 Invalid, 0 Unknown, 0 Unchecked, 594.77ms Time] [2021-11-13 18:47:36,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2021-11-13 18:47:36,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 150. [2021-11-13 18:47:36,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 80 states have (on average 1.8) internal successors, (144), 135 states have internal predecessors, (144), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-13 18:47:36,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 161 transitions. [2021-11-13 18:47:36,123 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 161 transitions. Word has length 35 [2021-11-13 18:47:36,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:47:36,124 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 161 transitions. [2021-11-13 18:47:36,124 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 3.375) internal successors, (54), 13 states have internal predecessors, (54), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-13 18:47:36,124 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 161 transitions. [2021-11-13 18:47:36,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-13 18:47:36,125 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:36,125 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:36,164 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-13 18:47:36,325 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:47:36,326 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting dll_circular_createErr6REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:36,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:36,326 INFO L85 PathProgramCache]: Analyzing trace with hash -1436321051, now seen corresponding path program 1 times [2021-11-13 18:47:36,326 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:36,326 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1635158105] [2021-11-13 18:47:36,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:36,327 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:36,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:36,399 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:36,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:36,416 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-13 18:47:36,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:36,423 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-13 18:47:36,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:36,452 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-13 18:47:36,452 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:36,453 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1635158105] [2021-11-13 18:47:36,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1635158105] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:47:36,453 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:47:36,453 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-13 18:47:36,453 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036786677] [2021-11-13 18:47:36,453 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:47:36,454 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-13 18:47:36,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:36,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-13 18:47:36,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-13 18:47:36,455 INFO L87 Difference]: Start difference. First operand 150 states and 161 transitions. Second operand has 9 states, 8 states have (on average 3.25) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-13 18:47:37,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:47:37,049 INFO L93 Difference]: Finished difference Result 169 states and 181 transitions. [2021-11-13 18:47:37,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-13 18:47:37,050 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.25) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 36 [2021-11-13 18:47:37,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:47:37,051 INFO L225 Difference]: With dead ends: 169 [2021-11-13 18:47:37,052 INFO L226 Difference]: Without dead ends: 169 [2021-11-13 18:47:37,052 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-11-13 18:47:37,053 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 75 mSDsluCounter, 299 mSDsCounter, 0 mSdLazyCounter, 718 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 436.08ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 423 SdHoareTripleChecker+Invalid, 734 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.98ms SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 718 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 525.45ms IncrementalHoareTripleChecker+Time [2021-11-13 18:47:37,053 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 423 Invalid, 734 Unknown, 0 Unchecked, 6.98ms Time], IncrementalHoareTripleChecker [16 Valid, 718 Invalid, 0 Unknown, 0 Unchecked, 525.45ms Time] [2021-11-13 18:47:37,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-11-13 18:47:37,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 149. [2021-11-13 18:47:37,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 80 states have (on average 1.7875) internal successors, (143), 134 states have internal predecessors, (143), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-13 18:47:37,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 160 transitions. [2021-11-13 18:47:37,062 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 160 transitions. Word has length 36 [2021-11-13 18:47:37,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:47:37,063 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 160 transitions. [2021-11-13 18:47:37,063 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.25) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-13 18:47:37,063 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 160 transitions. [2021-11-13 18:47:37,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-13 18:47:37,065 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:37,065 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:37,066 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-13 18:47:37,066 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting dll_circular_createErr7REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:37,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:37,067 INFO L85 PathProgramCache]: Analyzing trace with hash -1436321050, now seen corresponding path program 1 times [2021-11-13 18:47:37,067 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:37,067 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1290355070] [2021-11-13 18:47:37,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:37,068 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:37,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:37,180 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:37,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:37,201 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-13 18:47:37,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:37,207 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-13 18:47:37,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:37,279 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 18:47:37,279 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:37,279 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1290355070] [2021-11-13 18:47:37,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1290355070] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:47:37,280 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:47:37,280 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-13 18:47:37,280 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552924787] [2021-11-13 18:47:37,280 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:47:37,282 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-13 18:47:37,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:37,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-13 18:47:37,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-13 18:47:37,283 INFO L87 Difference]: Start difference. First operand 149 states and 160 transitions. Second operand has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-13 18:47:37,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:47:37,817 INFO L93 Difference]: Finished difference Result 167 states and 179 transitions. [2021-11-13 18:47:37,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-13 18:47:37,818 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 36 [2021-11-13 18:47:37,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:47:37,819 INFO L225 Difference]: With dead ends: 167 [2021-11-13 18:47:37,819 INFO L226 Difference]: Without dead ends: 167 [2021-11-13 18:47:37,820 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-11-13 18:47:37,821 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 72 mSDsluCounter, 309 mSDsCounter, 0 mSdLazyCounter, 703 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 377.42ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 433 SdHoareTripleChecker+Invalid, 716 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.74ms SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 703 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 462.65ms IncrementalHoareTripleChecker+Time [2021-11-13 18:47:37,821 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 433 Invalid, 716 Unknown, 0 Unchecked, 5.74ms Time], IncrementalHoareTripleChecker [13 Valid, 703 Invalid, 0 Unknown, 0 Unchecked, 462.65ms Time] [2021-11-13 18:47:37,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-13 18:47:37,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 148. [2021-11-13 18:47:37,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 80 states have (on average 1.775) internal successors, (142), 133 states have internal predecessors, (142), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-13 18:47:37,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 159 transitions. [2021-11-13 18:47:37,827 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 159 transitions. Word has length 36 [2021-11-13 18:47:37,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:47:37,828 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 159 transitions. [2021-11-13 18:47:37,828 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-13 18:47:37,828 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 159 transitions. [2021-11-13 18:47:37,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-13 18:47:37,829 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:37,829 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:37,829 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-13 18:47:37,829 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting dll_circular_createErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:37,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:37,830 INFO L85 PathProgramCache]: Analyzing trace with hash -1757977551, now seen corresponding path program 1 times [2021-11-13 18:47:37,830 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:37,830 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702131728] [2021-11-13 18:47:37,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:37,831 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:37,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:37,905 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:37,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:37,922 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-13 18:47:37,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:37,931 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-13 18:47:37,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:37,940 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2021-11-13 18:47:37,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:37,947 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-13 18:47:37,948 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:37,948 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1702131728] [2021-11-13 18:47:37,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1702131728] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:47:37,948 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [593862018] [2021-11-13 18:47:37,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:37,948 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:47:37,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:47:37,953 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:47:37,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-13 18:47:38,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:38,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-13 18:47:38,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:47:38,246 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-13 18:47:38,246 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-13 18:47:38,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [593862018] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:47:38,246 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:47:38,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 11 [2021-11-13 18:47:38,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468396001] [2021-11-13 18:47:38,247 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:47:38,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-13 18:47:38,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:38,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-13 18:47:38,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-11-13 18:47:38,249 INFO L87 Difference]: Start difference. First operand 148 states and 159 transitions. Second operand has 6 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 4 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-13 18:47:38,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:47:38,289 INFO L93 Difference]: Finished difference Result 136 states and 143 transitions. [2021-11-13 18:47:38,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-13 18:47:38,289 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 4 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 47 [2021-11-13 18:47:38,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:47:38,293 INFO L225 Difference]: With dead ends: 136 [2021-11-13 18:47:38,293 INFO L226 Difference]: Without dead ends: 136 [2021-11-13 18:47:38,294 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-11-13 18:47:38,295 INFO L933 BasicCegarLoop]: 136 mSDtfsCounter, 52 mSDsluCounter, 479 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.91ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 615 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.64ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.33ms IncrementalHoareTripleChecker+Time [2021-11-13 18:47:38,296 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 615 Invalid, 28 Unknown, 0 Unchecked, 2.64ms Time], IncrementalHoareTripleChecker [4 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 17.33ms Time] [2021-11-13 18:47:38,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-11-13 18:47:38,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2021-11-13 18:47:38,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 73 states have (on average 1.7534246575342465) internal successors, (128), 122 states have internal predecessors, (128), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:47:38,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 143 transitions. [2021-11-13 18:47:38,305 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 143 transitions. Word has length 47 [2021-11-13 18:47:38,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:47:38,306 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 143 transitions. [2021-11-13 18:47:38,306 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 4 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-13 18:47:38,306 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 143 transitions. [2021-11-13 18:47:38,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-13 18:47:38,307 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:38,307 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:38,347 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-13 18:47:38,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-13 18:47:38,521 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting dll_circular_appendErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:38,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:38,522 INFO L85 PathProgramCache]: Analyzing trace with hash 995122279, now seen corresponding path program 1 times [2021-11-13 18:47:38,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:38,522 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [275855831] [2021-11-13 18:47:38,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:38,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:38,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:38,664 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:38,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:38,682 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:47:38,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:38,880 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:47:38,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:38,989 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-13 18:47:39,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:39,100 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-13 18:47:39,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:39,195 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-13 18:47:39,195 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:39,196 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [275855831] [2021-11-13 18:47:39,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [275855831] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:47:39,196 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [58857483] [2021-11-13 18:47:39,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:39,196 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:47:39,197 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:47:39,198 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:47:39,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-13 18:47:39,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:39,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-13 18:47:39,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:47:39,383 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 [2021-11-13 18:47:39,397 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 [2021-11-13 18:47:39,955 INFO L354 Elim1Store]: treesize reduction 50, result has 9.1 percent of original size [2021-11-13 18:47:39,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 23 treesize of output 22 [2021-11-13 18:47:40,145 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-13 18:47:40,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 15 [2021-11-13 18:47:40,253 INFO L354 Elim1Store]: treesize reduction 36, result has 23.4 percent of original size [2021-11-13 18:47:40,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 27 treesize of output 32 [2021-11-13 18:47:40,324 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-13 18:47:40,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:47:42,381 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_node_create_~temp~0.base_43 Int)) (or (<= |c_#StackHeapBarrier| v_node_create_~temp~0.base_43) (= (select (store |c_#valid| v_node_create_~temp~0.base_43 1) c_dll_circular_append_~head.base) 1))) is different from false [2021-11-13 18:47:42,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [58857483] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:47:42,383 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:47:42,384 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2021-11-13 18:47:42,384 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694256066] [2021-11-13 18:47:42,384 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:47:42,384 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-13 18:47:42,385 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:42,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-13 18:47:42,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=562, Unknown=1, NotChecked=48, Total=702 [2021-11-13 18:47:42,386 INFO L87 Difference]: Start difference. First operand 136 states and 143 transitions. Second operand has 26 states, 23 states have (on average 2.869565217391304) internal successors, (66), 21 states have internal predecessors, (66), 9 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-13 18:47:43,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:47:43,244 INFO L93 Difference]: Finished difference Result 154 states and 162 transitions. [2021-11-13 18:47:43,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-13 18:47:43,245 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 23 states have (on average 2.869565217391304) internal successors, (66), 21 states have internal predecessors, (66), 9 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) Word has length 53 [2021-11-13 18:47:43,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:47:43,247 INFO L225 Difference]: With dead ends: 154 [2021-11-13 18:47:43,247 INFO L226 Difference]: Without dead ends: 154 [2021-11-13 18:47:43,248 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 53 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 218 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=141, Invalid=854, Unknown=1, NotChecked=60, Total=1056 [2021-11-13 18:47:43,249 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 132 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 650 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 498.07ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 517 SdHoareTripleChecker+Invalid, 897 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.58ms SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 650 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 213 IncrementalHoareTripleChecker+Unchecked, 587.84ms IncrementalHoareTripleChecker+Time [2021-11-13 18:47:43,249 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 517 Invalid, 897 Unknown, 0 Unchecked, 5.58ms Time], IncrementalHoareTripleChecker [34 Valid, 650 Invalid, 0 Unknown, 213 Unchecked, 587.84ms Time] [2021-11-13 18:47:43,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-11-13 18:47:43,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 133. [2021-11-13 18:47:43,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 73 states have (on average 1.7123287671232876) internal successors, (125), 119 states have internal predecessors, (125), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:47:43,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 140 transitions. [2021-11-13 18:47:43,256 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 140 transitions. Word has length 53 [2021-11-13 18:47:43,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:47:43,257 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 140 transitions. [2021-11-13 18:47:43,257 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 23 states have (on average 2.869565217391304) internal successors, (66), 21 states have internal predecessors, (66), 9 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-13 18:47:43,257 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 140 transitions. [2021-11-13 18:47:43,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-13 18:47:43,258 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:43,259 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:43,306 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-13 18:47:43,473 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-13 18:47:43,473 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting dll_circular_appendErr1REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:43,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:43,474 INFO L85 PathProgramCache]: Analyzing trace with hash 995122280, now seen corresponding path program 1 times [2021-11-13 18:47:43,474 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:43,474 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896045659] [2021-11-13 18:47:43,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:43,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:43,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:43,671 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:43,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:43,693 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:47:43,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:43,863 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:47:43,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:43,958 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-13 18:47:43,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:44,065 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-13 18:47:44,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:44,120 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-13 18:47:44,121 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:44,121 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896045659] [2021-11-13 18:47:44,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896045659] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:47:44,121 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1284151669] [2021-11-13 18:47:44,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:44,122 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:47:44,122 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:47:44,125 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:47:44,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-13 18:47:44,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:44,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-13 18:47:44,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:47:44,316 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 [2021-11-13 18:47:44,350 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 [2021-11-13 18:47:44,366 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 [2021-11-13 18:47:44,744 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-13 18:47:44,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 20 [2021-11-13 18:47:45,002 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-13 18:47:45,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 30 [2021-11-13 18:47:45,869 INFO L354 Elim1Store]: treesize reduction 8, result has 68.0 percent of original size [2021-11-13 18:47:45,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 42 [2021-11-13 18:47:46,097 INFO L354 Elim1Store]: treesize reduction 66, result has 19.5 percent of original size [2021-11-13 18:47:46,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 38 treesize of output 46 [2021-11-13 18:47:46,441 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 1 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 18:47:46,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:47:48,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1284151669] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:47:48,644 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:47:48,644 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 28 [2021-11-13 18:47:48,645 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506132574] [2021-11-13 18:47:48,645 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:47:48,645 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-13 18:47:48,645 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:48,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-13 18:47:48,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=826, Unknown=1, NotChecked=0, Total=930 [2021-11-13 18:47:48,647 INFO L87 Difference]: Start difference. First operand 133 states and 140 transitions. Second operand has 29 states, 25 states have (on average 2.96) internal successors, (74), 22 states have internal predecessors, (74), 9 states have call successors, (13), 7 states have call predecessors, (13), 8 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-13 18:47:49,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:47:49,969 INFO L93 Difference]: Finished difference Result 152 states and 160 transitions. [2021-11-13 18:47:49,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-13 18:47:49,970 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 25 states have (on average 2.96) internal successors, (74), 22 states have internal predecessors, (74), 9 states have call successors, (13), 7 states have call predecessors, (13), 8 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) Word has length 53 [2021-11-13 18:47:49,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:47:49,972 INFO L225 Difference]: With dead ends: 152 [2021-11-13 18:47:49,973 INFO L226 Difference]: Without dead ends: 152 [2021-11-13 18:47:49,974 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 48 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 330 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=184, Invalid=1537, Unknown=1, NotChecked=0, Total=1722 [2021-11-13 18:47:49,975 INFO L933 BasicCegarLoop]: 108 mSDtfsCounter, 108 mSDsluCounter, 623 mSDsCounter, 0 mSdLazyCounter, 728 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 582.86ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 731 SdHoareTripleChecker+Invalid, 1473 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.77ms SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 728 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 725 IncrementalHoareTripleChecker+Unchecked, 688.51ms IncrementalHoareTripleChecker+Time [2021-11-13 18:47:49,976 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 731 Invalid, 1473 Unknown, 0 Unchecked, 7.77ms Time], IncrementalHoareTripleChecker [20 Valid, 728 Invalid, 0 Unknown, 725 Unchecked, 688.51ms Time] [2021-11-13 18:47:49,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-13 18:47:49,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 132. [2021-11-13 18:47:49,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 73 states have (on average 1.6986301369863013) internal successors, (124), 118 states have internal predecessors, (124), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:47:49,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 139 transitions. [2021-11-13 18:47:49,983 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 139 transitions. Word has length 53 [2021-11-13 18:47:49,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:47:49,983 INFO L470 AbstractCegarLoop]: Abstraction has 132 states and 139 transitions. [2021-11-13 18:47:49,984 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 25 states have (on average 2.96) internal successors, (74), 22 states have internal predecessors, (74), 9 states have call successors, (13), 7 states have call predecessors, (13), 8 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-13 18:47:49,984 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 139 transitions. [2021-11-13 18:47:49,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-13 18:47:49,985 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:49,985 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:50,014 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-13 18:47:50,189 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-13 18:47:50,189 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting dll_circular_appendErr8REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:50,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:50,190 INFO L85 PathProgramCache]: Analyzing trace with hash -1465192984, now seen corresponding path program 1 times [2021-11-13 18:47:50,190 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:50,190 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252007879] [2021-11-13 18:47:50,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:50,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:50,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:50,277 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:50,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:50,294 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:47:50,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:50,307 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:47:50,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:50,314 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-13 18:47:50,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:50,321 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-13 18:47:50,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:50,328 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-13 18:47:50,328 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:50,329 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252007879] [2021-11-13 18:47:50,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1252007879] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:47:50,330 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:47:50,330 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-13 18:47:50,331 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375389076] [2021-11-13 18:47:50,331 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:47:50,333 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 18:47:50,333 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:50,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 18:47:50,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-13 18:47:50,335 INFO L87 Difference]: Start difference. First operand 132 states and 139 transitions. Second operand has 5 states, 4 states have (on average 7.25) internal successors, (29), 3 states have internal predecessors, (29), 1 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-13 18:47:50,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:47:50,732 INFO L93 Difference]: Finished difference Result 147 states and 155 transitions. [2021-11-13 18:47:50,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-13 18:47:50,732 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 7.25) internal successors, (29), 3 states have internal predecessors, (29), 1 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 55 [2021-11-13 18:47:50,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:47:50,734 INFO L225 Difference]: With dead ends: 147 [2021-11-13 18:47:50,734 INFO L226 Difference]: Without dead ends: 147 [2021-11-13 18:47:50,735 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-13 18:47:50,736 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 86 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 299.33ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.95ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 357.87ms IncrementalHoareTripleChecker+Time [2021-11-13 18:47:50,736 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 179 Invalid, 305 Unknown, 0 Unchecked, 3.95ms Time], IncrementalHoareTripleChecker [14 Valid, 291 Invalid, 0 Unknown, 0 Unchecked, 357.87ms Time] [2021-11-13 18:47:50,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-11-13 18:47:50,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 128. [2021-11-13 18:47:50,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 73 states have (on average 1.643835616438356) internal successors, (120), 114 states have internal predecessors, (120), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:47:50,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 135 transitions. [2021-11-13 18:47:50,743 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 135 transitions. Word has length 55 [2021-11-13 18:47:50,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:47:50,744 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 135 transitions. [2021-11-13 18:47:50,744 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 7.25) internal successors, (29), 3 states have internal predecessors, (29), 1 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-13 18:47:50,745 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 135 transitions. [2021-11-13 18:47:50,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-13 18:47:50,746 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:50,746 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:50,746 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-13 18:47:50,746 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting dll_circular_appendErr9REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:50,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:50,747 INFO L85 PathProgramCache]: Analyzing trace with hash -1465192983, now seen corresponding path program 1 times [2021-11-13 18:47:50,747 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:50,748 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472764406] [2021-11-13 18:47:50,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:50,748 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:50,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:50,842 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:50,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:50,865 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:47:50,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:50,886 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:47:50,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:50,893 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-13 18:47:50,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:50,899 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-13 18:47:50,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:50,908 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-13 18:47:50,909 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:50,909 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472764406] [2021-11-13 18:47:50,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472764406] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:47:50,910 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:47:50,910 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-13 18:47:50,910 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209046060] [2021-11-13 18:47:50,910 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:47:50,911 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-13 18:47:50,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:50,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-13 18:47:50,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-13 18:47:50,912 INFO L87 Difference]: Start difference. First operand 128 states and 135 transitions. Second operand has 8 states, 7 states have (on average 4.142857142857143) internal successors, (29), 5 states have internal predecessors, (29), 3 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-13 18:47:51,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:47:51,370 INFO L93 Difference]: Finished difference Result 143 states and 151 transitions. [2021-11-13 18:47:51,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-13 18:47:51,371 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.142857142857143) internal successors, (29), 5 states have internal predecessors, (29), 3 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 55 [2021-11-13 18:47:51,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:47:51,373 INFO L225 Difference]: With dead ends: 143 [2021-11-13 18:47:51,373 INFO L226 Difference]: Without dead ends: 143 [2021-11-13 18:47:51,373 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2021-11-13 18:47:51,374 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 178 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 361 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 284.99ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 376 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.08ms SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 361 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 338.07ms IncrementalHoareTripleChecker+Time [2021-11-13 18:47:51,374 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [181 Valid, 288 Invalid, 376 Unknown, 0 Unchecked, 4.08ms Time], IncrementalHoareTripleChecker [15 Valid, 361 Invalid, 0 Unknown, 0 Unchecked, 338.07ms Time] [2021-11-13 18:47:51,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-11-13 18:47:51,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 124. [2021-11-13 18:47:51,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 73 states have (on average 1.5890410958904109) internal successors, (116), 110 states have internal predecessors, (116), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:47:51,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 131 transitions. [2021-11-13 18:47:51,381 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 131 transitions. Word has length 55 [2021-11-13 18:47:51,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:47:51,382 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 131 transitions. [2021-11-13 18:47:51,382 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.142857142857143) internal successors, (29), 5 states have internal predecessors, (29), 3 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-13 18:47:51,382 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 131 transitions. [2021-11-13 18:47:51,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-13 18:47:51,383 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:51,383 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:51,384 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-13 18:47:51,384 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting dll_circular_appendErr3REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:51,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:51,385 INFO L85 PathProgramCache]: Analyzing trace with hash -1465193335, now seen corresponding path program 1 times [2021-11-13 18:47:51,385 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:51,385 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135679149] [2021-11-13 18:47:51,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:51,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:51,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:51,474 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:51,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:51,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:47:51,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:51,508 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:47:51,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:51,515 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-13 18:47:51,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:51,521 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-13 18:47:51,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:51,574 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-13 18:47:51,574 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:51,574 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135679149] [2021-11-13 18:47:51,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2135679149] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:47:51,575 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:47:51,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-13 18:47:51,575 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [856538630] [2021-11-13 18:47:51,575 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:47:51,576 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-13 18:47:51,576 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:51,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-13 18:47:51,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-13 18:47:51,577 INFO L87 Difference]: Start difference. First operand 124 states and 131 transitions. Second operand has 8 states, 7 states have (on average 5.142857142857143) internal successors, (36), 5 states have internal predecessors, (36), 1 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-13 18:47:52,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:47:52,053 INFO L93 Difference]: Finished difference Result 139 states and 147 transitions. [2021-11-13 18:47:52,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-13 18:47:52,053 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.142857142857143) internal successors, (36), 5 states have internal predecessors, (36), 1 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) Word has length 55 [2021-11-13 18:47:52,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:47:52,057 INFO L225 Difference]: With dead ends: 139 [2021-11-13 18:47:52,058 INFO L226 Difference]: Without dead ends: 139 [2021-11-13 18:47:52,058 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-13 18:47:52,063 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 80 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 523 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 336.99ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 537 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.85ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 419.96ms IncrementalHoareTripleChecker+Time [2021-11-13 18:47:52,064 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 293 Invalid, 537 Unknown, 0 Unchecked, 3.85ms Time], IncrementalHoareTripleChecker [14 Valid, 523 Invalid, 0 Unknown, 0 Unchecked, 419.96ms Time] [2021-11-13 18:47:52,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-11-13 18:47:52,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 120. [2021-11-13 18:47:52,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 73 states have (on average 1.5342465753424657) internal successors, (112), 106 states have internal predecessors, (112), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:47:52,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 127 transitions. [2021-11-13 18:47:52,071 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 127 transitions. Word has length 55 [2021-11-13 18:47:52,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:47:52,071 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 127 transitions. [2021-11-13 18:47:52,071 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.142857142857143) internal successors, (36), 5 states have internal predecessors, (36), 1 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-13 18:47:52,072 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 127 transitions. [2021-11-13 18:47:52,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-13 18:47:52,072 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:52,073 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:52,073 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-13 18:47:52,073 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting dll_circular_appendErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:52,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:52,074 INFO L85 PathProgramCache]: Analyzing trace with hash -1465193336, now seen corresponding path program 1 times [2021-11-13 18:47:52,074 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:52,074 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [179294405] [2021-11-13 18:47:52,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:52,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:52,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:52,149 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:52,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:52,166 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:47:52,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:52,178 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:47:52,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:52,184 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-13 18:47:52,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:52,190 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-13 18:47:52,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:52,218 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 18:47:52,218 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:52,218 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [179294405] [2021-11-13 18:47:52,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [179294405] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:47:52,219 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:47:52,219 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-13 18:47:52,219 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217984736] [2021-11-13 18:47:52,219 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:47:52,220 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-13 18:47:52,220 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:52,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-13 18:47:52,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-13 18:47:52,221 INFO L87 Difference]: Start difference. First operand 120 states and 127 transitions. Second operand has 8 states, 7 states have (on average 4.857142857142857) internal successors, (34), 5 states have internal predecessors, (34), 1 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-13 18:47:52,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:47:52,646 INFO L93 Difference]: Finished difference Result 135 states and 143 transitions. [2021-11-13 18:47:52,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-13 18:47:52,646 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.857142857142857) internal successors, (34), 5 states have internal predecessors, (34), 1 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) Word has length 55 [2021-11-13 18:47:52,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:47:52,647 INFO L225 Difference]: With dead ends: 135 [2021-11-13 18:47:52,647 INFO L226 Difference]: Without dead ends: 135 [2021-11-13 18:47:52,648 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-13 18:47:52,648 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 77 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 499 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 308.48ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.85ms SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 499 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 375.26ms IncrementalHoareTripleChecker+Time [2021-11-13 18:47:52,649 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 293 Invalid, 514 Unknown, 0 Unchecked, 3.85ms Time], IncrementalHoareTripleChecker [15 Valid, 499 Invalid, 0 Unknown, 0 Unchecked, 375.26ms Time] [2021-11-13 18:47:52,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-13 18:47:52,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 116. [2021-11-13 18:47:52,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 73 states have (on average 1.4794520547945205) internal successors, (108), 102 states have internal predecessors, (108), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:47:52,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 123 transitions. [2021-11-13 18:47:52,655 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 123 transitions. Word has length 55 [2021-11-13 18:47:52,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:47:52,655 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 123 transitions. [2021-11-13 18:47:52,655 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.857142857142857) internal successors, (34), 5 states have internal predecessors, (34), 1 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-13 18:47:52,656 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 123 transitions. [2021-11-13 18:47:52,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-13 18:47:52,657 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:47:52,657 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:47:52,657 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-13 18:47:52,657 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting dll_circular_appendErr10REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:47:52,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:47:52,658 INFO L85 PathProgramCache]: Analyzing trace with hash 1823657878, now seen corresponding path program 1 times [2021-11-13 18:47:52,658 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:47:52,659 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [978978928] [2021-11-13 18:47:52,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:52,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:47:52,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:52,824 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:47:52,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:52,852 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:47:52,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:52,955 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:47:52,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:52,962 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-13 18:47:52,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:53,018 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-13 18:47:53,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:53,347 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-13 18:47:53,348 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:47:53,348 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [978978928] [2021-11-13 18:47:53,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [978978928] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:47:53,348 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [399051544] [2021-11-13 18:47:53,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:47:53,348 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:47:53,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:47:53,349 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:47:53,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-13 18:47:53,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:47:53,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-13 18:47:53,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:47:53,588 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 [2021-11-13 18:47:53,853 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 [2021-11-13 18:47:58,326 INFO L354 Elim1Store]: treesize reduction 193, result has 11.1 percent of original size [2021-11-13 18:47:58,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 53 treesize of output 45 [2021-11-13 18:47:58,350 INFO L354 Elim1Store]: treesize reduction 30, result has 37.5 percent of original size [2021-11-13 18:47:58,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 42 treesize of output 50 [2021-11-13 18:47:58,601 INFO L354 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2021-11-13 18:47:58,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 51 treesize of output 29 [2021-11-13 18:47:58,669 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 21 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 18:47:58,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:47:58,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [399051544] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:47:58,885 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:47:58,885 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 31 [2021-11-13 18:47:58,885 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522581665] [2021-11-13 18:47:58,885 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:47:58,886 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-13 18:47:58,886 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:47:58,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-13 18:47:58,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=956, Unknown=2, NotChecked=0, Total=1056 [2021-11-13 18:47:58,888 INFO L87 Difference]: Start difference. First operand 116 states and 123 transitions. Second operand has 32 states, 25 states have (on average 2.52) internal successors, (63), 24 states have internal predecessors, (63), 7 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-13 18:48:00,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:48:00,318 INFO L93 Difference]: Finished difference Result 134 states and 142 transitions. [2021-11-13 18:48:00,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-13 18:48:00,319 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 25 states have (on average 2.52) internal successors, (63), 24 states have internal predecessors, (63), 7 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) Word has length 56 [2021-11-13 18:48:00,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:48:00,320 INFO L225 Difference]: With dead ends: 134 [2021-11-13 18:48:00,320 INFO L226 Difference]: Without dead ends: 134 [2021-11-13 18:48:00,322 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=154, Invalid=1484, Unknown=2, NotChecked=0, Total=1640 [2021-11-13 18:48:00,322 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 123 mSDsluCounter, 632 mSDsCounter, 0 mSdLazyCounter, 1312 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 846.63ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 712 SdHoareTripleChecker+Invalid, 1490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.41ms SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 1312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 144 IncrementalHoareTripleChecker+Unchecked, 997.23ms IncrementalHoareTripleChecker+Time [2021-11-13 18:48:00,323 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 712 Invalid, 1490 Unknown, 0 Unchecked, 8.41ms Time], IncrementalHoareTripleChecker [34 Valid, 1312 Invalid, 0 Unknown, 144 Unchecked, 997.23ms Time] [2021-11-13 18:48:00,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-11-13 18:48:00,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 115. [2021-11-13 18:48:00,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 73 states have (on average 1.4657534246575343) internal successors, (107), 101 states have internal predecessors, (107), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:48:00,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 122 transitions. [2021-11-13 18:48:00,329 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 122 transitions. Word has length 56 [2021-11-13 18:48:00,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:48:00,329 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 122 transitions. [2021-11-13 18:48:00,330 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 25 states have (on average 2.52) internal successors, (63), 24 states have internal predecessors, (63), 7 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-13 18:48:00,330 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 122 transitions. [2021-11-13 18:48:00,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-13 18:48:00,330 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:48:00,331 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:48:00,374 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-13 18:48:00,557 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:48:00,557 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting dll_circular_appendErr11REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:48:00,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:48:00,558 INFO L85 PathProgramCache]: Analyzing trace with hash 1823657879, now seen corresponding path program 1 times [2021-11-13 18:48:00,558 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:48:00,558 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715575106] [2021-11-13 18:48:00,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:48:00,558 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:48:00,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:00,787 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:48:00,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:00,814 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:48:00,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:00,962 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:48:00,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:00,968 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-13 18:48:00,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:01,085 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-13 18:48:01,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:01,884 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-13 18:48:01,884 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:48:01,884 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715575106] [2021-11-13 18:48:01,884 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [715575106] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:48:01,884 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1030936491] [2021-11-13 18:48:01,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:48:01,885 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:48:01,885 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:48:01,886 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:48:01,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-13 18:48:02,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:02,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 70 conjunts are in the unsatisfiable core [2021-11-13 18:48:02,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:48:02,129 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 [2021-11-13 18:48:02,139 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 [2021-11-13 18:48:02,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 30 [2021-11-13 18:48:02,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-11-13 18:48:11,675 INFO L354 Elim1Store]: treesize reduction 193, result has 11.1 percent of original size [2021-11-13 18:48:11,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 105 treesize of output 93 [2021-11-13 18:48:11,813 INFO L354 Elim1Store]: treesize reduction 193, result has 11.1 percent of original size [2021-11-13 18:48:11,813 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 94 treesize of output 82 [2021-11-13 18:48:11,824 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-13 18:48:11,825 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 83 treesize of output 83 [2021-11-13 18:48:11,838 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-13 18:48:11,839 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 77 treesize of output 79 [2021-11-13 18:48:12,192 INFO L354 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2021-11-13 18:48:12,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 90 treesize of output 68 [2021-11-13 18:48:12,202 INFO L354 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2021-11-13 18:48:12,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 59 treesize of output 37 [2021-11-13 18:48:12,293 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 17 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 18:48:12,293 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:48:14,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1030936491] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:48:14,987 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:48:14,987 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 39 [2021-11-13 18:48:14,987 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537276358] [2021-11-13 18:48:14,988 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:48:14,988 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-13 18:48:14,988 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:48:14,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-13 18:48:14,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1678, Unknown=5, NotChecked=0, Total=1806 [2021-11-13 18:48:14,991 INFO L87 Difference]: Start difference. First operand 115 states and 122 transitions. Second operand has 40 states, 33 states have (on average 2.393939393939394) internal successors, (79), 31 states have internal predecessors, (79), 7 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-13 18:48:25,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:48:25,277 INFO L93 Difference]: Finished difference Result 133 states and 141 transitions. [2021-11-13 18:48:25,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-13 18:48:25,281 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 33 states have (on average 2.393939393939394) internal successors, (79), 31 states have internal predecessors, (79), 7 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) Word has length 56 [2021-11-13 18:48:25,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:48:25,282 INFO L225 Difference]: With dead ends: 133 [2021-11-13 18:48:25,282 INFO L226 Difference]: Without dead ends: 133 [2021-11-13 18:48:25,284 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 618 ImplicationChecksByTransitivity, 21.3s TimeCoverageRelationStatistics Valid=225, Invalid=2958, Unknown=9, NotChecked=0, Total=3192 [2021-11-13 18:48:25,285 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 80 mSDsluCounter, 862 mSDsCounter, 0 mSdLazyCounter, 1763 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1025.78ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 942 SdHoareTripleChecker+Invalid, 2065 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 10.55ms SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1763 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 286 IncrementalHoareTripleChecker+Unchecked, 1230.08ms IncrementalHoareTripleChecker+Time [2021-11-13 18:48:25,285 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 942 Invalid, 2065 Unknown, 0 Unchecked, 10.55ms Time], IncrementalHoareTripleChecker [16 Valid, 1763 Invalid, 0 Unknown, 286 Unchecked, 1230.08ms Time] [2021-11-13 18:48:25,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-13 18:48:25,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 114. [2021-11-13 18:48:25,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 73 states have (on average 1.452054794520548) internal successors, (106), 100 states have internal predecessors, (106), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:48:25,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 121 transitions. [2021-11-13 18:48:25,291 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 121 transitions. Word has length 56 [2021-11-13 18:48:25,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:48:25,292 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 121 transitions. [2021-11-13 18:48:25,292 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 33 states have (on average 2.393939393939394) internal successors, (79), 31 states have internal predecessors, (79), 7 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-13 18:48:25,293 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 121 transitions. [2021-11-13 18:48:25,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-13 18:48:25,293 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:48:25,294 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:48:25,345 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-13 18:48:25,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:48:25,521 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting dll_circular_appendErr12REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:48:25,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:48:25,522 INFO L85 PathProgramCache]: Analyzing trace with hash 188568119, now seen corresponding path program 1 times [2021-11-13 18:48:25,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:48:25,522 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349790306] [2021-11-13 18:48:25,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:48:25,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:48:25,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:25,816 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:48:25,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:25,849 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:48:25,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:26,063 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:48:26,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:26,070 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-13 18:48:26,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:26,186 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-13 18:48:26,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:27,339 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-13 18:48:27,340 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:48:27,340 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349790306] [2021-11-13 18:48:27,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [349790306] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:48:27,340 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [318308791] [2021-11-13 18:48:27,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:48:27,341 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:48:27,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:48:27,343 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:48:27,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-13 18:48:27,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:27,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-13 18:48:27,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:48:27,565 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 [2021-11-13 18:48:27,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-11-13 18:48:28,270 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 18:48:28,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 35 [2021-11-13 18:48:28,274 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-13 18:48:28,282 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-13 18:48:28,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 24 [2021-11-13 18:48:33,022 INFO L354 Elim1Store]: treesize reduction 394, result has 8.6 percent of original size [2021-11-13 18:48:33,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 99 treesize of output 93 [2021-11-13 18:48:33,088 INFO L354 Elim1Store]: treesize reduction 193, result has 11.1 percent of original size [2021-11-13 18:48:33,088 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 88 treesize of output 80 [2021-11-13 18:48:33,129 INFO L354 Elim1Store]: treesize reduction 116, result has 32.2 percent of original size [2021-11-13 18:48:33,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 77 treesize of output 106 [2021-11-13 18:48:33,565 INFO L354 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2021-11-13 18:48:33,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 111 treesize of output 89 [2021-11-13 18:48:33,829 INFO L354 Elim1Store]: treesize reduction 67, result has 17.3 percent of original size [2021-11-13 18:48:33,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 86 treesize of output 55 [2021-11-13 18:48:34,085 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 17 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 18:48:34,086 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:48:34,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [318308791] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:48:34,673 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:48:34,674 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 45 [2021-11-13 18:48:34,674 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610925337] [2021-11-13 18:48:34,674 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:48:34,674 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-13 18:48:34,675 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:48:34,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-13 18:48:34,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=2214, Unknown=2, NotChecked=0, Total=2352 [2021-11-13 18:48:34,676 INFO L87 Difference]: Start difference. First operand 114 states and 121 transitions. Second operand has 46 states, 39 states have (on average 2.076923076923077) internal successors, (81), 37 states have internal predecessors, (81), 7 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-13 18:48:46,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:48:46,969 INFO L93 Difference]: Finished difference Result 132 states and 140 transitions. [2021-11-13 18:48:46,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-13 18:48:46,970 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 39 states have (on average 2.076923076923077) internal successors, (81), 37 states have internal predecessors, (81), 7 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) Word has length 58 [2021-11-13 18:48:46,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:48:46,971 INFO L225 Difference]: With dead ends: 132 [2021-11-13 18:48:46,971 INFO L226 Difference]: Without dead ends: 132 [2021-11-13 18:48:46,974 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 889 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=280, Invalid=4136, Unknown=6, NotChecked=0, Total=4422 [2021-11-13 18:48:46,975 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 135 mSDsluCounter, 1096 mSDsCounter, 0 mSdLazyCounter, 2273 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2196.42ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 1172 SdHoareTripleChecker+Invalid, 2612 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 13.34ms SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 2273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 304 IncrementalHoareTripleChecker+Unchecked, 2519.41ms IncrementalHoareTripleChecker+Time [2021-11-13 18:48:46,975 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 1172 Invalid, 2612 Unknown, 0 Unchecked, 13.34ms Time], IncrementalHoareTripleChecker [35 Valid, 2273 Invalid, 0 Unknown, 304 Unchecked, 2519.41ms Time] [2021-11-13 18:48:46,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-13 18:48:46,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 113. [2021-11-13 18:48:46,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 73 states have (on average 1.4383561643835616) internal successors, (105), 99 states have internal predecessors, (105), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:48:46,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 120 transitions. [2021-11-13 18:48:46,982 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 120 transitions. Word has length 58 [2021-11-13 18:48:46,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:48:46,983 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 120 transitions. [2021-11-13 18:48:46,983 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 39 states have (on average 2.076923076923077) internal successors, (81), 37 states have internal predecessors, (81), 7 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-13 18:48:46,984 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 120 transitions. [2021-11-13 18:48:46,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-13 18:48:46,985 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:48:46,985 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:48:47,017 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-13 18:48:47,201 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-13 18:48:47,201 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting dll_circular_appendErr13REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:48:47,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:48:47,202 INFO L85 PathProgramCache]: Analyzing trace with hash 188568120, now seen corresponding path program 1 times [2021-11-13 18:48:47,202 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:48:47,202 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689004628] [2021-11-13 18:48:47,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:48:47,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:48:47,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:47,515 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:48:47,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:47,540 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:48:47,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:47,876 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:48:47,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:47,987 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-13 18:48:47,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:48,213 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-13 18:48:48,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:49,454 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-13 18:48:49,454 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:48:49,455 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689004628] [2021-11-13 18:48:49,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [689004628] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:48:49,455 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [741490804] [2021-11-13 18:48:49,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:48:49,455 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:48:49,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:48:49,456 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:48:49,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-13 18:48:49,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:48:49,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 111 conjunts are in the unsatisfiable core [2021-11-13 18:48:49,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:48:49,667 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 [2021-11-13 18:48:49,672 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 [2021-11-13 18:48:50,189 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-13 18:48:50,190 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 [2021-11-13 18:48:50,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-13 18:48:50,552 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 [2021-11-13 18:48:50,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-11-13 18:48:51,229 INFO L354 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2021-11-13 18:48:51,229 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 99 treesize of output 44 [2021-11-13 18:48:51,248 INFO L354 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2021-11-13 18:48:51,248 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 45 [2021-11-13 18:48:51,260 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-13 18:48:51,260 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 35 [2021-11-13 18:48:51,269 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-13 18:48:51,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 25 [2021-11-13 18:49:00,074 INFO L354 Elim1Store]: treesize reduction 394, result has 8.6 percent of original size [2021-11-13 18:49:00,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 166 treesize of output 120 [2021-11-13 18:49:00,163 INFO L354 Elim1Store]: treesize reduction 368, result has 8.7 percent of original size [2021-11-13 18:49:00,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 155 treesize of output 141 [2021-11-13 18:49:00,183 INFO L354 Elim1Store]: treesize reduction 34, result has 44.3 percent of original size [2021-11-13 18:49:00,183 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 144 treesize of output 146 [2021-11-13 18:49:00,206 INFO L354 Elim1Store]: treesize reduction 108, result has 21.2 percent of original size [2021-11-13 18:49:00,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 137 treesize of output 142 [2021-11-13 18:49:00,871 INFO L354 Elim1Store]: treesize reduction 92, result has 1.1 percent of original size [2021-11-13 18:49:00,872 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 170 treesize of output 87 [2021-11-13 18:49:00,891 INFO L354 Elim1Store]: treesize reduction 66, result has 12.0 percent of original size [2021-11-13 18:49:00,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 75 treesize of output 59 [2021-11-13 18:49:01,150 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:49:01,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:49:07,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [741490804] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:49:07,248 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:49:07,248 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 54 [2021-11-13 18:49:07,248 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782179618] [2021-11-13 18:49:07,249 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:49:07,249 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-13 18:49:07,249 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:49:07,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-13 18:49:07,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=3358, Unknown=5, NotChecked=0, Total=3540 [2021-11-13 18:49:07,252 INFO L87 Difference]: Start difference. First operand 113 states and 120 transitions. Second operand has 55 states, 48 states have (on average 1.8958333333333333) internal successors, (91), 43 states have internal predecessors, (91), 9 states have call successors, (13), 7 states have call predecessors, (13), 9 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-13 18:49:26,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:49:26,260 INFO L93 Difference]: Finished difference Result 131 states and 139 transitions. [2021-11-13 18:49:26,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-13 18:49:26,261 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 48 states have (on average 1.8958333333333333) internal successors, (91), 43 states have internal predecessors, (91), 9 states have call successors, (13), 7 states have call predecessors, (13), 9 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) Word has length 58 [2021-11-13 18:49:26,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:49:26,262 INFO L225 Difference]: With dead ends: 131 [2021-11-13 18:49:26,262 INFO L226 Difference]: Without dead ends: 131 [2021-11-13 18:49:26,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1358 ImplicationChecksByTransitivity, 33.7s TimeCoverageRelationStatistics Valid=339, Invalid=5658, Unknown=9, NotChecked=0, Total=6006 [2021-11-13 18:49:26,264 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 207 mSDsluCounter, 876 mSDsCounter, 0 mSdLazyCounter, 1903 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2011.28ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 950 SdHoareTripleChecker+Invalid, 2403 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 10.91ms SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 1903 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 450 IncrementalHoareTripleChecker+Unchecked, 2277.35ms IncrementalHoareTripleChecker+Time [2021-11-13 18:49:26,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 950 Invalid, 2403 Unknown, 0 Unchecked, 10.91ms Time], IncrementalHoareTripleChecker [50 Valid, 1903 Invalid, 0 Unknown, 450 Unchecked, 2277.35ms Time] [2021-11-13 18:49:26,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-11-13 18:49:26,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 112. [2021-11-13 18:49:26,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 73 states have (on average 1.4246575342465753) internal successors, (104), 98 states have internal predecessors, (104), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:49:26,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 119 transitions. [2021-11-13 18:49:26,270 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 119 transitions. Word has length 58 [2021-11-13 18:49:26,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:49:26,270 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 119 transitions. [2021-11-13 18:49:26,270 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 48 states have (on average 1.8958333333333333) internal successors, (91), 43 states have internal predecessors, (91), 9 states have call successors, (13), 7 states have call predecessors, (13), 9 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-13 18:49:26,270 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 119 transitions. [2021-11-13 18:49:26,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-13 18:49:26,271 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:49:26,271 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:49:26,293 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-13 18:49:26,471 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-13 18:49:26,471 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting mainErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:49:26,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:49:26,472 INFO L85 PathProgramCache]: Analyzing trace with hash -672650451, now seen corresponding path program 1 times [2021-11-13 18:49:26,472 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:49:26,472 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238617955] [2021-11-13 18:49:26,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:49:26,472 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:49:26,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:26,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:49:26,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:26,544 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:49:26,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:26,555 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:49:26,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:26,560 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-13 18:49:26,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:26,565 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-13 18:49:26,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:26,631 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:49:26,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:26,638 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-13 18:49:26,638 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:49:26,639 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1238617955] [2021-11-13 18:49:26,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1238617955] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:49:26,639 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:49:26,639 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-13 18:49:26,639 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536314459] [2021-11-13 18:49:26,639 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:49:26,640 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-13 18:49:26,640 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:49:26,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-13 18:49:26,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-13 18:49:26,641 INFO L87 Difference]: Start difference. First operand 112 states and 119 transitions. Second operand has 8 states, 7 states have (on average 4.714285714285714) internal successors, (33), 5 states have internal predecessors, (33), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-13 18:49:27,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:49:27,060 INFO L93 Difference]: Finished difference Result 131 states and 139 transitions. [2021-11-13 18:49:27,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-13 18:49:27,060 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.714285714285714) internal successors, (33), 5 states have internal predecessors, (33), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 60 [2021-11-13 18:49:27,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:49:27,061 INFO L225 Difference]: With dead ends: 131 [2021-11-13 18:49:27,061 INFO L226 Difference]: Without dead ends: 131 [2021-11-13 18:49:27,062 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-13 18:49:27,062 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 120 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 293.82ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.08ms SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 348.29ms IncrementalHoareTripleChecker+Time [2021-11-13 18:49:27,063 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [120 Valid, 223 Invalid, 393 Unknown, 0 Unchecked, 3.08ms Time], IncrementalHoareTripleChecker [13 Valid, 380 Invalid, 0 Unknown, 0 Unchecked, 348.29ms Time] [2021-11-13 18:49:27,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-11-13 18:49:27,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 111. [2021-11-13 18:49:27,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 73 states have (on average 1.4109589041095891) internal successors, (103), 97 states have internal predecessors, (103), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:49:27,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 118 transitions. [2021-11-13 18:49:27,068 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 118 transitions. Word has length 60 [2021-11-13 18:49:27,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:49:27,068 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 118 transitions. [2021-11-13 18:49:27,069 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.714285714285714) internal successors, (33), 5 states have internal predecessors, (33), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-13 18:49:27,069 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 118 transitions. [2021-11-13 18:49:27,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-13 18:49:27,070 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:49:27,070 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:49:27,070 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-13 18:49:27,070 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting mainErr1REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:49:27,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:49:27,071 INFO L85 PathProgramCache]: Analyzing trace with hash -672650450, now seen corresponding path program 1 times [2021-11-13 18:49:27,071 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:49:27,071 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2094711621] [2021-11-13 18:49:27,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:49:27,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:49:27,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:27,140 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:49:27,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:27,160 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:49:27,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:27,175 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:49:27,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:27,180 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-13 18:49:27,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:27,185 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-13 18:49:27,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:27,234 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:49:27,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:27,242 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-13 18:49:27,242 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:49:27,242 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2094711621] [2021-11-13 18:49:27,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2094711621] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:49:27,242 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:49:27,243 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-13 18:49:27,243 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341528868] [2021-11-13 18:49:27,243 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:49:27,243 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-13 18:49:27,244 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:49:27,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-13 18:49:27,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-13 18:49:27,245 INFO L87 Difference]: Start difference. First operand 111 states and 118 transitions. Second operand has 9 states, 8 states have (on average 4.125) internal successors, (33), 6 states have internal predecessors, (33), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-13 18:49:27,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:49:27,739 INFO L93 Difference]: Finished difference Result 127 states and 135 transitions. [2021-11-13 18:49:27,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-13 18:49:27,739 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.125) internal successors, (33), 6 states have internal predecessors, (33), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 60 [2021-11-13 18:49:27,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:49:27,741 INFO L225 Difference]: With dead ends: 127 [2021-11-13 18:49:27,741 INFO L226 Difference]: Without dead ends: 127 [2021-11-13 18:49:27,741 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-13 18:49:27,742 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 127 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 411 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 361.07ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.67ms SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 411 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 421.55ms IncrementalHoareTripleChecker+Time [2021-11-13 18:49:27,742 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 268 Invalid, 427 Unknown, 0 Unchecked, 3.67ms Time], IncrementalHoareTripleChecker [16 Valid, 411 Invalid, 0 Unknown, 0 Unchecked, 421.55ms Time] [2021-11-13 18:49:27,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-13 18:49:27,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 108. [2021-11-13 18:49:27,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 73 states have (on average 1.36986301369863) internal successors, (100), 94 states have internal predecessors, (100), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:49:27,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 115 transitions. [2021-11-13 18:49:27,746 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 115 transitions. Word has length 60 [2021-11-13 18:49:27,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:49:27,747 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 115 transitions. [2021-11-13 18:49:27,747 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.125) internal successors, (33), 6 states have internal predecessors, (33), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-13 18:49:27,747 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 115 transitions. [2021-11-13 18:49:27,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-13 18:49:27,749 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:49:27,750 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:49:27,750 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-13 18:49:27,750 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting mainErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:49:27,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:49:27,751 INFO L85 PathProgramCache]: Analyzing trace with hash 2122979889, now seen corresponding path program 1 times [2021-11-13 18:49:27,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:49:27,751 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1783976156] [2021-11-13 18:49:27,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:49:27,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:49:27,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:27,825 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:49:27,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:27,846 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:49:27,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:27,864 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:49:27,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:27,869 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-13 18:49:27,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:27,874 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-13 18:49:27,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:27,975 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:49:27,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:28,015 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 18:49:28,015 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:49:28,015 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1783976156] [2021-11-13 18:49:28,015 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1783976156] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:49:28,015 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:49:28,015 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-13 18:49:28,016 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103559248] [2021-11-13 18:49:28,016 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:49:28,016 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-13 18:49:28,016 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:49:28,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-13 18:49:28,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-11-13 18:49:28,017 INFO L87 Difference]: Start difference. First operand 108 states and 115 transitions. Second operand has 13 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 9 states have internal predecessors, (40), 2 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-13 18:49:28,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:49:28,869 INFO L93 Difference]: Finished difference Result 155 states and 168 transitions. [2021-11-13 18:49:28,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-13 18:49:28,870 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 9 states have internal predecessors, (40), 2 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 62 [2021-11-13 18:49:28,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:49:28,871 INFO L225 Difference]: With dead ends: 155 [2021-11-13 18:49:28,871 INFO L226 Difference]: Without dead ends: 155 [2021-11-13 18:49:28,872 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2021-11-13 18:49:28,872 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 141 mSDsluCounter, 284 mSDsCounter, 0 mSdLazyCounter, 745 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 606.16ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 350 SdHoareTripleChecker+Invalid, 770 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.98ms SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 745 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 709.20ms IncrementalHoareTripleChecker+Time [2021-11-13 18:49:28,872 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [141 Valid, 350 Invalid, 770 Unknown, 0 Unchecked, 6.98ms Time], IncrementalHoareTripleChecker [25 Valid, 745 Invalid, 0 Unknown, 0 Unchecked, 709.20ms Time] [2021-11-13 18:49:28,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-11-13 18:49:28,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 112. [2021-11-13 18:49:28,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 77 states have (on average 1.3506493506493507) internal successors, (104), 97 states have internal predecessors, (104), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-13 18:49:28,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 120 transitions. [2021-11-13 18:49:28,880 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 120 transitions. Word has length 62 [2021-11-13 18:49:28,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:49:28,881 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 120 transitions. [2021-11-13 18:49:28,881 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 9 states have internal predecessors, (40), 2 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-13 18:49:28,881 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 120 transitions. [2021-11-13 18:49:28,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-13 18:49:28,883 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:49:28,883 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:49:28,883 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-13 18:49:28,883 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting mainErr3REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:49:28,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:49:28,884 INFO L85 PathProgramCache]: Analyzing trace with hash 2122979890, now seen corresponding path program 1 times [2021-11-13 18:49:28,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:49:28,884 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142329713] [2021-11-13 18:49:28,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:49:28,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:49:28,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:28,994 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:49:28,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:29,017 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:49:29,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:29,037 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:49:29,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:29,042 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-13 18:49:29,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:29,047 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-13 18:49:29,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:29,163 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:49:29,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:29,228 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-13 18:49:29,229 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:49:29,229 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1142329713] [2021-11-13 18:49:29,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1142329713] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:49:29,229 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:49:29,229 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-13 18:49:29,229 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81543255] [2021-11-13 18:49:29,229 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:49:29,229 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-13 18:49:29,230 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:49:29,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-13 18:49:29,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-11-13 18:49:29,239 INFO L87 Difference]: Start difference. First operand 112 states and 120 transitions. Second operand has 13 states, 11 states have (on average 3.8181818181818183) internal successors, (42), 9 states have internal predecessors, (42), 2 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-13 18:49:29,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:49:29,975 INFO L93 Difference]: Finished difference Result 158 states and 171 transitions. [2021-11-13 18:49:29,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-13 18:49:29,976 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 3.8181818181818183) internal successors, (42), 9 states have internal predecessors, (42), 2 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 62 [2021-11-13 18:49:29,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:49:29,978 INFO L225 Difference]: With dead ends: 158 [2021-11-13 18:49:29,978 INFO L226 Difference]: Without dead ends: 158 [2021-11-13 18:49:29,978 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2021-11-13 18:49:29,979 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 110 mSDsluCounter, 365 mSDsCounter, 0 mSdLazyCounter, 857 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 504.48ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 433 SdHoareTripleChecker+Invalid, 873 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.16ms SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 857 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 605.06ms IncrementalHoareTripleChecker+Time [2021-11-13 18:49:29,979 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 433 Invalid, 873 Unknown, 0 Unchecked, 6.16ms Time], IncrementalHoareTripleChecker [16 Valid, 857 Invalid, 0 Unknown, 0 Unchecked, 605.06ms Time] [2021-11-13 18:49:29,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-11-13 18:49:29,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 114. [2021-11-13 18:49:29,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 79 states have (on average 1.3417721518987342) internal successors, (106), 99 states have internal predecessors, (106), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-13 18:49:29,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 122 transitions. [2021-11-13 18:49:29,984 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 122 transitions. Word has length 62 [2021-11-13 18:49:29,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:49:29,984 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 122 transitions. [2021-11-13 18:49:29,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 3.8181818181818183) internal successors, (42), 9 states have internal predecessors, (42), 2 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-13 18:49:29,985 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 122 transitions. [2021-11-13 18:49:29,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-13 18:49:29,986 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:49:29,986 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:49:29,986 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-11-13 18:49:29,986 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting dll_circular_appendErr22REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:49:29,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:49:29,987 INFO L85 PathProgramCache]: Analyzing trace with hash -257889632, now seen corresponding path program 1 times [2021-11-13 18:49:29,987 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:49:29,987 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1987634796] [2021-11-13 18:49:29,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:49:29,988 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:49:30,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:30,306 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:49:30,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:30,339 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:49:30,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:30,354 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:49:30,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:30,359 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-13 18:49:30,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:30,363 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-13 18:49:30,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:30,456 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-13 18:49:30,456 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:49:30,456 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1987634796] [2021-11-13 18:49:30,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1987634796] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:49:30,456 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:49:30,456 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-11-13 18:49:30,457 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287228506] [2021-11-13 18:49:30,457 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:49:30,457 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-13 18:49:30,457 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:49:30,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-13 18:49:30,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=266, Unknown=0, NotChecked=0, Total=306 [2021-11-13 18:49:30,458 INFO L87 Difference]: Start difference. First operand 114 states and 122 transitions. Second operand has 18 states, 16 states have (on average 2.8125) internal successors, (45), 14 states have internal predecessors, (45), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-13 18:49:31,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:49:31,443 INFO L93 Difference]: Finished difference Result 132 states and 141 transitions. [2021-11-13 18:49:31,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-13 18:49:31,444 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 2.8125) internal successors, (45), 14 states have internal predecessors, (45), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 64 [2021-11-13 18:49:31,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:49:31,445 INFO L225 Difference]: With dead ends: 132 [2021-11-13 18:49:31,445 INFO L226 Difference]: Without dead ends: 132 [2021-11-13 18:49:31,445 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=115, Invalid=641, Unknown=0, NotChecked=0, Total=756 [2021-11-13 18:49:31,446 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 134 mSDsluCounter, 475 mSDsCounter, 0 mSdLazyCounter, 964 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 627.70ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 548 SdHoareTripleChecker+Invalid, 1000 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.41ms SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 964 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 736.31ms IncrementalHoareTripleChecker+Time [2021-11-13 18:49:31,446 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 548 Invalid, 1000 Unknown, 0 Unchecked, 8.41ms Time], IncrementalHoareTripleChecker [36 Valid, 964 Invalid, 0 Unknown, 0 Unchecked, 736.31ms Time] [2021-11-13 18:49:31,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-13 18:49:31,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 113. [2021-11-13 18:49:31,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 79 states have (on average 1.3291139240506329) internal successors, (105), 98 states have internal predecessors, (105), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-13 18:49:31,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 121 transitions. [2021-11-13 18:49:31,451 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 121 transitions. Word has length 64 [2021-11-13 18:49:31,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:49:31,451 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 121 transitions. [2021-11-13 18:49:31,451 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 2.8125) internal successors, (45), 14 states have internal predecessors, (45), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-13 18:49:31,452 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 121 transitions. [2021-11-13 18:49:31,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-13 18:49:31,452 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:49:31,453 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:49:31,453 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-11-13 18:49:31,453 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting dll_circular_appendErr23REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:49:31,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:49:31,453 INFO L85 PathProgramCache]: Analyzing trace with hash -257889631, now seen corresponding path program 1 times [2021-11-13 18:49:31,454 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:49:31,454 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [495975961] [2021-11-13 18:49:31,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:49:31,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:49:31,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:32,022 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:49:32,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:32,056 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:49:32,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:32,168 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:49:32,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:32,173 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-13 18:49:32,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:32,249 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-13 18:49:32,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:32,570 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-13 18:49:32,570 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:49:32,570 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [495975961] [2021-11-13 18:49:32,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [495975961] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:49:32,570 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:49:32,571 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-11-13 18:49:32,571 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114790650] [2021-11-13 18:49:32,571 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:49:32,571 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-13 18:49:32,571 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:49:32,571 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-13 18:49:32,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=589, Unknown=0, NotChecked=0, Total=650 [2021-11-13 18:49:32,572 INFO L87 Difference]: Start difference. First operand 113 states and 121 transitions. Second operand has 26 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 20 states have internal predecessors, (52), 4 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-13 18:49:34,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:49:34,009 INFO L93 Difference]: Finished difference Result 153 states and 167 transitions. [2021-11-13 18:49:34,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-13 18:49:34,010 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 20 states have internal predecessors, (52), 4 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 64 [2021-11-13 18:49:34,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:49:34,011 INFO L225 Difference]: With dead ends: 153 [2021-11-13 18:49:34,011 INFO L226 Difference]: Without dead ends: 153 [2021-11-13 18:49:34,012 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=155, Invalid=1327, Unknown=0, NotChecked=0, Total=1482 [2021-11-13 18:49:34,013 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 157 mSDsluCounter, 630 mSDsCounter, 0 mSdLazyCounter, 1318 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 848.59ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 693 SdHoareTripleChecker+Invalid, 1369 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 10.41ms SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 1318 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 986.01ms IncrementalHoareTripleChecker+Time [2021-11-13 18:49:34,013 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [162 Valid, 693 Invalid, 1369 Unknown, 0 Unchecked, 10.41ms Time], IncrementalHoareTripleChecker [51 Valid, 1318 Invalid, 0 Unknown, 0 Unchecked, 986.01ms Time] [2021-11-13 18:49:34,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-11-13 18:49:34,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 112. [2021-11-13 18:49:34,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 79 states have (on average 1.3164556962025316) internal successors, (104), 97 states have internal predecessors, (104), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-13 18:49:34,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 120 transitions. [2021-11-13 18:49:34,018 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 120 transitions. Word has length 64 [2021-11-13 18:49:34,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:49:34,019 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 120 transitions. [2021-11-13 18:49:34,019 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 20 states have internal predecessors, (52), 4 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-13 18:49:34,019 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 120 transitions. [2021-11-13 18:49:34,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-13 18:49:34,020 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:49:34,020 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:49:34,020 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-11-13 18:49:34,020 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting mainErr14ASSERT_VIOLATIONMEMORY_LEAK === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:49:34,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:49:34,021 INFO L85 PathProgramCache]: Analyzing trace with hash 74209656, now seen corresponding path program 1 times [2021-11-13 18:49:34,021 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:49:34,021 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295329687] [2021-11-13 18:49:34,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:49:34,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:49:34,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:34,107 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:49:34,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:34,126 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:49:34,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:34,224 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:49:34,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:34,229 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-13 18:49:34,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:34,283 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-13 18:49:34,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:34,562 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:49:34,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:34,798 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-13 18:49:34,798 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:49:34,798 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295329687] [2021-11-13 18:49:34,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [295329687] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:49:34,798 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1825880244] [2021-11-13 18:49:34,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:49:34,799 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:49:34,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:49:34,801 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:49:34,817 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-13 18:49:34,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:49:34,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-13 18:49:34,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:49:35,273 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-11-13 18:49:37,470 WARN L860 $PredicateComparison]: unable to prove that (exists ((node_create_~temp~0.offset Int) (node_create_~temp~0.base Int)) (and (<= (+ node_create_~temp~0.base 1) |c_#StackHeapBarrier|) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| node_create_~temp~0.base (let ((.cse0 (+ node_create_~temp~0.offset 8))) (store (store (store (select |c_old(#memory_$Pointer$.base)| node_create_~temp~0.base) node_create_~temp~0.offset 0) (+ node_create_~temp~0.offset 4) 0) .cse0 (select (select |c_#memory_$Pointer$.base| node_create_~temp~0.base) .cse0))))))) is different from true [2021-11-13 18:49:49,693 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_DerPreprocessor_8 Int) (node_create_~temp~0.offset Int) (node_create_~temp~0.base Int)) (and (= (select (select (store |c_old(#memory_$Pointer$.base)| node_create_~temp~0.base (store (store (store (select |c_old(#memory_$Pointer$.base)| node_create_~temp~0.base) node_create_~temp~0.offset 0) (+ node_create_~temp~0.offset 4) 0) (+ node_create_~temp~0.offset 8) v_DerPreprocessor_8)) |c_dll_circular_append_#in~head.base|) |c_dll_circular_append_#in~head.offset|) |c_dll_circular_append_#t~mem12.base|) (<= (+ node_create_~temp~0.base 1) |c_#StackHeapBarrier|))) is different from true [2021-11-13 18:49:51,727 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_DerPreprocessor_8 Int) (node_create_~temp~0.offset Int) (node_create_~temp~0.base Int)) (and (<= (+ node_create_~temp~0.base 1) |c_#StackHeapBarrier|) (= (select (select (store |c_old(#memory_$Pointer$.base)| node_create_~temp~0.base (store (store (store (select |c_old(#memory_$Pointer$.base)| node_create_~temp~0.base) node_create_~temp~0.offset 0) (+ node_create_~temp~0.offset 4) 0) (+ node_create_~temp~0.offset 8) v_DerPreprocessor_8)) |c_dll_circular_append_#in~head.base|) |c_dll_circular_append_#in~head.offset|) 0))) is different from true [2021-11-13 18:49:51,832 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 3 not checked. [2021-11-13 18:49:51,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:49:53,967 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_node_create_~temp~0.offset_60 Int) (v_DerPreprocessor_9 Int) (v_node_create_~temp~0.base_64 Int)) (or (not (= (select (select (store |c_#memory_$Pointer$.base| v_node_create_~temp~0.base_64 (store (store (store (select |c_#memory_$Pointer$.base| v_node_create_~temp~0.base_64) v_node_create_~temp~0.offset_60 0) (+ v_node_create_~temp~0.offset_60 4) 0) (+ v_node_create_~temp~0.offset_60 8) v_DerPreprocessor_9)) |c_main_~#s~0.base|) |c_main_~#s~0.offset|) 0)) (<= |c_#StackHeapBarrier| v_node_create_~temp~0.base_64))) is different from false [2021-11-13 18:49:53,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1825880244] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:49:53,969 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:49:53,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 20] total 33 [2021-11-13 18:49:53,970 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232929494] [2021-11-13 18:49:53,970 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:49:53,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-13 18:49:53,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:49:53,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-13 18:49:53,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=780, Unknown=9, NotChecked=236, Total=1122 [2021-11-13 18:49:53,971 INFO L87 Difference]: Start difference. First operand 112 states and 120 transitions. Second operand has 33 states, 27 states have (on average 2.6296296296296298) internal successors, (71), 27 states have internal predecessors, (71), 7 states have call successors, (13), 4 states have call predecessors, (13), 7 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-13 18:50:29,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:50:29,364 INFO L93 Difference]: Finished difference Result 126 states and 133 transitions. [2021-11-13 18:50:29,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-13 18:50:29,364 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 27 states have (on average 2.6296296296296298) internal successors, (71), 27 states have internal predecessors, (71), 7 states have call successors, (13), 4 states have call predecessors, (13), 7 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) Word has length 64 [2021-11-13 18:50:29,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:50:29,366 INFO L225 Difference]: With dead ends: 126 [2021-11-13 18:50:29,366 INFO L226 Difference]: Without dead ends: 121 [2021-11-13 18:50:29,367 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 67 SyntacticMatches, 5 SemanticMatches, 44 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 53.6s TimeCoverageRelationStatistics Valid=167, Invalid=1555, Unknown=16, NotChecked=332, Total=2070 [2021-11-13 18:50:29,368 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 150 mSDsluCounter, 748 mSDsCounter, 0 mSdLazyCounter, 922 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 597.29ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 823 SdHoareTripleChecker+Invalid, 1348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.74ms SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 922 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 399 IncrementalHoareTripleChecker+Unchecked, 689.84ms IncrementalHoareTripleChecker+Time [2021-11-13 18:50:29,368 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [153 Valid, 823 Invalid, 1348 Unknown, 0 Unchecked, 6.74ms Time], IncrementalHoareTripleChecker [27 Valid, 922 Invalid, 0 Unknown, 399 Unchecked, 689.84ms Time] [2021-11-13 18:50:29,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-11-13 18:50:29,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 102. [2021-11-13 18:50:29,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 70 states have (on average 1.3285714285714285) internal successors, (93), 88 states have internal predecessors, (93), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:50:29,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 108 transitions. [2021-11-13 18:50:29,373 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 108 transitions. Word has length 64 [2021-11-13 18:50:29,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:50:29,373 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 108 transitions. [2021-11-13 18:50:29,373 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 27 states have (on average 2.6296296296296298) internal successors, (71), 27 states have internal predecessors, (71), 7 states have call successors, (13), 4 states have call predecessors, (13), 7 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-13 18:50:29,374 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 108 transitions. [2021-11-13 18:50:29,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-13 18:50:29,374 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:50:29,374 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:50:29,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-13 18:50:29,601 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:50:29,601 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting mainErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:50:29,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:50:29,602 INFO L85 PathProgramCache]: Analyzing trace with hash -2120302745, now seen corresponding path program 1 times [2021-11-13 18:50:29,602 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:50:29,602 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264896672] [2021-11-13 18:50:29,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:29,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:50:29,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:29,705 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:50:29,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:29,721 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:50:29,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:29,731 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:50:29,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:29,736 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-13 18:50:29,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:29,740 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-13 18:50:29,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:29,878 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:50:29,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:29,938 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 18:50:29,939 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:50:29,939 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264896672] [2021-11-13 18:50:29,939 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1264896672] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:50:29,939 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:50:29,939 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-11-13 18:50:29,939 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50701410] [2021-11-13 18:50:29,939 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:50:29,940 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-13 18:50:29,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:50:29,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-13 18:50:29,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-11-13 18:50:29,942 INFO L87 Difference]: Start difference. First operand 102 states and 108 transitions. Second operand has 15 states, 13 states have (on average 3.6923076923076925) internal successors, (48), 11 states have internal predecessors, (48), 2 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-13 18:50:30,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:50:30,708 INFO L93 Difference]: Finished difference Result 124 states and 131 transitions. [2021-11-13 18:50:30,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-13 18:50:30,708 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 3.6923076923076925) internal successors, (48), 11 states have internal predecessors, (48), 2 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 70 [2021-11-13 18:50:30,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:50:30,709 INFO L225 Difference]: With dead ends: 124 [2021-11-13 18:50:30,709 INFO L226 Difference]: Without dead ends: 124 [2021-11-13 18:50:30,710 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=74, Invalid=432, Unknown=0, NotChecked=0, Total=506 [2021-11-13 18:50:30,710 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 109 mSDsluCounter, 343 mSDsCounter, 0 mSdLazyCounter, 877 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 501.81ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 407 SdHoareTripleChecker+Invalid, 898 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.28ms SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 877 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 584.52ms IncrementalHoareTripleChecker+Time [2021-11-13 18:50:30,711 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 407 Invalid, 898 Unknown, 0 Unchecked, 5.28ms Time], IncrementalHoareTripleChecker [21 Valid, 877 Invalid, 0 Unknown, 0 Unchecked, 584.52ms Time] [2021-11-13 18:50:30,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-13 18:50:30,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 103. [2021-11-13 18:50:30,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 71 states have (on average 1.3380281690140845) internal successors, (95), 89 states have internal predecessors, (95), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 18:50:30,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 110 transitions. [2021-11-13 18:50:30,715 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 110 transitions. Word has length 70 [2021-11-13 18:50:30,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:50:30,716 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 110 transitions. [2021-11-13 18:50:30,716 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 3.6923076923076925) internal successors, (48), 11 states have internal predecessors, (48), 2 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-13 18:50:30,716 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 110 transitions. [2021-11-13 18:50:30,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-13 18:50:30,717 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:50:30,717 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:50:30,717 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-11-13 18:50:30,717 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting mainErr3REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-13 18:50:30,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:50:30,718 INFO L85 PathProgramCache]: Analyzing trace with hash -2120302744, now seen corresponding path program 1 times [2021-11-13 18:50:30,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:50:30,718 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578659986] [2021-11-13 18:50:30,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:30,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:50:30,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:30,946 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 18:50:30,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:30,966 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-13 18:50:30,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:31,474 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:50:31,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:31,576 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-13 18:50:31,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:31,803 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-13 18:50:31,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:34,261 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-13 18:50:34,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:35,533 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 16 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-13 18:50:35,533 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:50:35,533 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1578659986] [2021-11-13 18:50:35,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1578659986] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:50:35,533 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1218371110] [2021-11-13 18:50:35,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:50:35,533 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:50:35,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:50:35,534 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:50:35,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f99d8419-81da-4ca3-ae06-d6dfa7b89c6d/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-13 18:50:35,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:50:35,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 130 conjunts are in the unsatisfiable core [2021-11-13 18:50:35,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:50:35,689 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 [2021-11-13 18:50:35,753 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 [2021-11-13 18:50:36,055 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 [2021-11-13 18:50:36,061 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 [2021-11-13 18:50:36,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-11-13 18:50:36,833 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-13 18:50:36,833 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2021-11-13 18:50:37,084 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 18:50:37,084 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 48 treesize of output 31 [2021-11-13 18:50:37,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2021-11-13 18:50:37,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2021-11-13 18:50:37,100 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 [2021-11-13 19:00:25,560 WARN L227 SmtUtils]: Spent 8.57m on a formula simplification. DAG size of input: 3353 DAG size of output: 981 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-13 19:00:25,572 INFO L354 Elim1Store]: treesize reduction 128234, result has 6.6 percent of original size [2021-11-13 19:00:25,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 28 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 37 new quantified variables, introduced 262 case distinctions, treesize of input 17086902507 treesize of output 10501959949