./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 8f9453cad2383b5119b308e041fed5f4a740e7abd43cb8ad7833872af20a8d57 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-02 22:17:53,179 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-02 22:17:53,183 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-02 22:17:53,252 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-02 22:17:53,253 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-02 22:17:53,260 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-02 22:17:53,264 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-02 22:17:53,270 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-02 22:17:53,274 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-02 22:17:53,284 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-02 22:17:53,285 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-02 22:17:53,288 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-02 22:17:53,289 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-02 22:17:53,292 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-02 22:17:53,297 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-02 22:17:53,304 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-02 22:17:53,306 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-02 22:17:53,308 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-02 22:17:53,315 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-02 22:17:53,318 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-02 22:17:53,320 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-02 22:17:53,322 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-02 22:17:53,324 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-02 22:17:53,325 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-02 22:17:53,330 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-02 22:17:53,330 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-02 22:17:53,331 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-02 22:17:53,332 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-02 22:17:53,333 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-02 22:17:53,335 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-02 22:17:53,335 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-02 22:17:53,337 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-02 22:17:53,338 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-02 22:17:53,339 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-02 22:17:53,341 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-02 22:17:53,342 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-02 22:17:53,343 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-02 22:17:53,343 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-02 22:17:53,343 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-02 22:17:53,345 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-02 22:17:53,346 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-02 22:17:53,347 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-11-02 22:17:53,381 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-02 22:17:53,382 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-02 22:17:53,383 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-02 22:17:53,383 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-02 22:17:53,384 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-02 22:17:53,385 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-02 22:17:53,385 INFO L138 SettingsManager]: * Use SBE=true [2021-11-02 22:17:53,386 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-02 22:17:53,386 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-02 22:17:53,386 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-02 22:17:53,388 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-02 22:17:53,388 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-02 22:17:53,388 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-02 22:17:53,389 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-02 22:17:53,389 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-02 22:17:53,389 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-02 22:17:53,389 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-02 22:17:53,390 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-02 22:17:53,390 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-02 22:17:53,390 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-02 22:17:53,391 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-02 22:17:53,391 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-02 22:17:53,391 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-02 22:17:53,392 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:17:53,392 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-02 22:17:53,392 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-02 22:17:53,393 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-02 22:17:53,393 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-02 22:17:53,393 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-02 22:17:53,394 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_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8f9453cad2383b5119b308e041fed5f4a740e7abd43cb8ad7833872af20a8d57 [2021-11-02 22:17:53,729 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-02 22:17:53,772 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-02 22:17:53,775 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-02 22:17:53,778 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-02 22:17:53,779 INFO L275 PluginConnector]: CDTParser initialized [2021-11-02 22:17:53,780 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i [2021-11-02 22:17:53,881 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/data/73d12aa0a/0464125e8c6745f88bbd1b10ac0a1d96/FLAG3cc935ce8 [2021-11-02 22:17:54,493 INFO L306 CDTParser]: Found 1 translation units. [2021-11-02 22:17:54,494 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i [2021-11-02 22:17:54,512 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/data/73d12aa0a/0464125e8c6745f88bbd1b10ac0a1d96/FLAG3cc935ce8 [2021-11-02 22:17:54,781 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/data/73d12aa0a/0464125e8c6745f88bbd1b10ac0a1d96 [2021-11-02 22:17:54,784 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-02 22:17:54,786 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-02 22:17:54,791 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-02 22:17:54,793 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-02 22:17:54,797 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-02 22:17:54,799 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:17:54" (1/1) ... [2021-11-02 22:17:54,801 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c6b58b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:17:54, skipping insertion in model container [2021-11-02 22:17:54,802 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:17:54" (1/1) ... [2021-11-02 22:17:54,811 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-02 22:17:54,876 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-02 22:17:55,321 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_b29e3676-fd62-4673-a55b-a033fbab7b47/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i[22636,22649] [2021-11-02 22:17:55,392 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:17:55,406 INFO L203 MainTranslator]: Completed pre-run [2021-11-02 22:17:55,443 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_b29e3676-fd62-4673-a55b-a033fbab7b47/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i[22636,22649] [2021-11-02 22:17:55,461 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:17:55,499 INFO L208 MainTranslator]: Completed translation [2021-11-02 22:17:55,499 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:17:55 WrapperNode [2021-11-02 22:17:55,499 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-02 22:17:55,501 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-02 22:17:55,501 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-02 22:17:55,501 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-02 22:17:55,520 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:17:55" (1/1) ... [2021-11-02 22:17:55,521 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:17:55" (1/1) ... [2021-11-02 22:17:55,568 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:17:55" (1/1) ... [2021-11-02 22:17:55,569 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:17:55" (1/1) ... [2021-11-02 22:17:55,597 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:17:55" (1/1) ... [2021-11-02 22:17:55,610 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:17:55" (1/1) ... [2021-11-02 22:17:55,626 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:17:55" (1/1) ... [2021-11-02 22:17:55,644 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-02 22:17:55,645 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-02 22:17:55,645 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-02 22:17:55,645 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-02 22:17:55,655 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:17:55" (1/1) ... [2021-11-02 22:17:55,665 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:17:55,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:17:55,701 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-02 22:17:55,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-02 22:17:55,769 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-02 22:17:55,769 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-02 22:17:55,770 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-11-02 22:17:55,771 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-02 22:17:55,771 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-02 22:17:55,772 INFO L138 BoogieDeclarations]: Found implementation of procedure fail [2021-11-02 22:17:55,773 INFO L138 BoogieDeclarations]: Found implementation of procedure alloc_node [2021-11-02 22:17:55,773 INFO L138 BoogieDeclarations]: Found implementation of procedure chain_node [2021-11-02 22:17:55,773 INFO L138 BoogieDeclarations]: Found implementation of procedure create_sll [2021-11-02 22:17:55,774 INFO L138 BoogieDeclarations]: Found implementation of procedure init_back_link [2021-11-02 22:17:55,775 INFO L138 BoogieDeclarations]: Found implementation of procedure reverse_dll [2021-11-02 22:17:55,775 INFO L138 BoogieDeclarations]: Found implementation of procedure remove_fw_link [2021-11-02 22:17:55,775 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_next [2021-11-02 22:17:55,775 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_prev [2021-11-02 22:17:55,775 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-02 22:17:55,776 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-02 22:17:55,776 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-11-02 22:17:55,776 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-11-02 22:17:55,776 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-11-02 22:17:55,777 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-11-02 22:17:55,777 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-02 22:17:55,777 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-02 22:17:55,777 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-02 22:17:55,777 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-02 22:17:55,778 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-02 22:17:55,778 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-02 22:17:55,778 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-02 22:17:55,778 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-02 22:17:55,778 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-02 22:17:55,779 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-02 22:17:55,779 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-02 22:17:55,779 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-02 22:17:55,779 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-02 22:17:55,779 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-02 22:17:55,780 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-02 22:17:55,780 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-02 22:17:55,780 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-02 22:17:55,780 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-02 22:17:55,780 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-02 22:17:55,781 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-02 22:17:55,781 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-02 22:17:55,781 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-02 22:17:55,781 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-02 22:17:55,782 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-02 22:17:55,782 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-02 22:17:55,782 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-02 22:17:55,783 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-02 22:17:55,783 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-02 22:17:55,783 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-02 22:17:55,784 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-02 22:17:55,785 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-02 22:17:55,785 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-02 22:17:55,785 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-02 22:17:55,785 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-02 22:17:55,785 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-02 22:17:55,786 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-02 22:17:55,786 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-02 22:17:55,786 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-02 22:17:55,787 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-02 22:17:55,787 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-02 22:17:55,787 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-02 22:17:55,787 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-02 22:17:55,788 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-02 22:17:55,788 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-02 22:17:55,788 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-02 22:17:55,789 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-02 22:17:55,790 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-02 22:17:55,790 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-02 22:17:55,791 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-02 22:17:55,792 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-02 22:17:55,792 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-02 22:17:55,792 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-02 22:17:55,793 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-02 22:17:55,793 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-02 22:17:55,793 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-02 22:17:55,794 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-02 22:17:55,794 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-02 22:17:55,794 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2021-11-02 22:17:55,794 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-02 22:17:55,794 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-02 22:17:55,795 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-02 22:17:55,796 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-02 22:17:55,796 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-02 22:17:55,796 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-02 22:17:55,796 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-02 22:17:55,797 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-02 22:17:55,797 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-02 22:17:55,797 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-02 22:17:55,797 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-02 22:17:55,797 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-02 22:17:55,798 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-02 22:17:55,798 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-02 22:17:55,798 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-02 22:17:55,798 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-02 22:17:55,798 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-02 22:17:55,799 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-02 22:17:55,799 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-02 22:17:55,799 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-02 22:17:55,799 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-02 22:17:55,799 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-02 22:17:55,800 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-02 22:17:55,800 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-02 22:17:55,800 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-02 22:17:55,800 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-02 22:17:55,800 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-02 22:17:55,801 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-02 22:17:55,801 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-02 22:17:55,801 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-02 22:17:55,802 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-02 22:17:55,802 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-02 22:17:55,802 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-02 22:17:55,802 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-02 22:17:55,803 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-02 22:17:55,803 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-02 22:17:55,804 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-02 22:17:55,804 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-02 22:17:55,804 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-02 22:17:55,804 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-02 22:17:55,804 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-02 22:17:55,805 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-02 22:17:55,805 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-02 22:17:55,805 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-02 22:17:55,805 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-11-02 22:17:55,806 INFO L130 BoogieDeclarations]: Found specification of procedure fail [2021-11-02 22:17:55,806 INFO L130 BoogieDeclarations]: Found specification of procedure alloc_node [2021-11-02 22:17:55,806 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-02 22:17:55,807 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-02 22:17:55,808 INFO L130 BoogieDeclarations]: Found specification of procedure chain_node [2021-11-02 22:17:55,811 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-02 22:17:55,812 INFO L130 BoogieDeclarations]: Found specification of procedure create_sll [2021-11-02 22:17:55,812 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-02 22:17:55,813 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-02 22:17:55,814 INFO L130 BoogieDeclarations]: Found specification of procedure init_back_link [2021-11-02 22:17:55,815 INFO L130 BoogieDeclarations]: Found specification of procedure reverse_dll [2021-11-02 22:17:55,815 INFO L130 BoogieDeclarations]: Found specification of procedure remove_fw_link [2021-11-02 22:17:55,815 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_next [2021-11-02 22:17:55,816 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_prev [2021-11-02 22:17:55,822 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-02 22:17:55,822 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-02 22:17:55,823 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-02 22:17:55,823 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-02 22:17:55,823 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-02 22:17:55,823 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-02 22:17:57,118 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-02 22:17:57,119 INFO L299 CfgBuilder]: Removed 33 assume(true) statements. [2021-11-02 22:17:57,122 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:17:57 BoogieIcfgContainer [2021-11-02 22:17:57,122 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-02 22:17:57,128 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-02 22:17:57,131 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-02 22:17:57,136 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-02 22:17:57,136 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 10:17:54" (1/3) ... [2021-11-02 22:17:57,137 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@668f1948 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:17:57, skipping insertion in model container [2021-11-02 22:17:57,137 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:17:55" (2/3) ... [2021-11-02 22:17:57,138 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@668f1948 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:17:57, skipping insertion in model container [2021-11-02 22:17:57,139 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:17:57" (3/3) ... [2021-11-02 22:17:57,140 INFO L111 eAbstractionObserver]: Analyzing ICFG sll_to_dll_rev-2.i [2021-11-02 22:17:57,156 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-02 22:17:57,157 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 83 error locations. [2021-11-02 22:17:57,259 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-02 22:17:57,273 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-02 22:17:57,273 INFO L340 AbstractCegarLoop]: Starting to check reachability of 83 error locations. [2021-11-02 22:17:57,308 INFO L276 IsEmpty]: Start isEmpty. Operand has 244 states, 128 states have (on average 2.03125) internal successors, (260), 219 states have internal predecessors, (260), 24 states have call successors, (24), 11 states have call predecessors, (24), 11 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-11-02 22:17:57,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-02 22:17:57,318 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:17:57,319 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:17:57,319 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting create_sllErr0REQUIRES_VIOLATION === [remove_fw_linkErr0REQUIRES_VIOLATION, remove_fw_linkErr1REQUIRES_VIOLATION, remove_fw_linkErr2REQUIRES_VIOLATION, remove_fw_linkErr3REQUIRES_VIOLATION (and 79 more)] === [2021-11-02 22:17:57,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:17:57,326 INFO L85 PathProgramCache]: Analyzing trace with hash 576320188, now seen corresponding path program 1 times [2021-11-02 22:17:57,338 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:17:57,339 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624657200] [2021-11-02 22:17:57,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:17:57,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:17:57,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:17:57,660 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:17:57,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:17:57,702 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:17:57,703 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:17:57,703 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624657200] [2021-11-02 22:17:57,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [624657200] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:17:57,704 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:17:57,705 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:17:57,717 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504290267] [2021-11-02 22:17:57,723 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-02 22:17:57,724 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:17:57,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-02 22:17:57,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-02 22:17:57,749 INFO L87 Difference]: Start difference. First operand has 244 states, 128 states have (on average 2.03125) internal successors, (260), 219 states have internal predecessors, (260), 24 states have call successors, (24), 11 states have call predecessors, (24), 11 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:17:58,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:17:58,336 INFO L93 Difference]: Finished difference Result 242 states and 263 transitions. [2021-11-02 22:17:58,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-02 22:17:58,338 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-11-02 22:17:58,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:17:58,358 INFO L225 Difference]: With dead ends: 242 [2021-11-02 22:17:58,358 INFO L226 Difference]: Without dead ends: 239 [2021-11-02 22:17:58,360 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-02 22:17:58,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2021-11-02 22:17:58,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 239. [2021-11-02 22:17:58,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 123 states have (on average 1.7967479674796747) internal successors, (221), 212 states have internal predecessors, (221), 24 states have call successors, (24), 11 states have call predecessors, (24), 9 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-02 22:17:58,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 260 transitions. [2021-11-02 22:17:58,463 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 260 transitions. Word has length 10 [2021-11-02 22:17:58,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:17:58,463 INFO L470 AbstractCegarLoop]: Abstraction has 239 states and 260 transitions. [2021-11-02 22:17:58,464 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:17:58,464 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 260 transitions. [2021-11-02 22:17:58,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-02 22:17:58,465 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:17:58,465 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:17:58,466 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-02 22:17:58,466 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting alloc_nodeErr0REQUIRES_VIOLATION === [remove_fw_linkErr0REQUIRES_VIOLATION, remove_fw_linkErr1REQUIRES_VIOLATION, remove_fw_linkErr2REQUIRES_VIOLATION, remove_fw_linkErr3REQUIRES_VIOLATION (and 79 more)] === [2021-11-02 22:17:58,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:17:58,469 INFO L85 PathProgramCache]: Analyzing trace with hash -891387824, now seen corresponding path program 1 times [2021-11-02 22:17:58,469 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:17:58,470 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917062679] [2021-11-02 22:17:58,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:17:58,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:17:58,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:17:58,636 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:17:58,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:17:58,676 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:17:58,676 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:17:58,676 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917062679] [2021-11-02 22:17:58,677 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1917062679] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:17:58,677 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:17:58,677 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:17:58,677 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243092390] [2021-11-02 22:17:58,679 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:17:58,679 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:17:58,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:17:58,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:17:58,680 INFO L87 Difference]: Start difference. First operand 239 states and 260 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:17:59,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:17:59,320 INFO L93 Difference]: Finished difference Result 237 states and 258 transitions. [2021-11-02 22:17:59,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:17:59,321 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-11-02 22:17:59,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:17:59,325 INFO L225 Difference]: With dead ends: 237 [2021-11-02 22:17:59,325 INFO L226 Difference]: Without dead ends: 237 [2021-11-02 22:17:59,326 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:17:59,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2021-11-02 22:17:59,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 237. [2021-11-02 22:17:59,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 123 states have (on average 1.7804878048780488) internal successors, (219), 210 states have internal predecessors, (219), 24 states have call successors, (24), 11 states have call predecessors, (24), 9 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-02 22:17:59,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 258 transitions. [2021-11-02 22:17:59,359 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 258 transitions. Word has length 14 [2021-11-02 22:17:59,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:17:59,359 INFO L470 AbstractCegarLoop]: Abstraction has 237 states and 258 transitions. [2021-11-02 22:17:59,360 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:17:59,360 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 258 transitions. [2021-11-02 22:17:59,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-02 22:17:59,361 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:17:59,361 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:17:59,361 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-02 22:17:59,362 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting alloc_nodeErr1REQUIRES_VIOLATION === [remove_fw_linkErr0REQUIRES_VIOLATION, remove_fw_linkErr1REQUIRES_VIOLATION, remove_fw_linkErr2REQUIRES_VIOLATION, remove_fw_linkErr3REQUIRES_VIOLATION (and 79 more)] === [2021-11-02 22:17:59,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:17:59,363 INFO L85 PathProgramCache]: Analyzing trace with hash -891387823, now seen corresponding path program 1 times [2021-11-02 22:17:59,364 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:17:59,369 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [502463919] [2021-11-02 22:17:59,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:17:59,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:17:59,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:17:59,491 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:17:59,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:17:59,502 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:17:59,502 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:17:59,502 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [502463919] [2021-11-02 22:17:59,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [502463919] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:17:59,503 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:17:59,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:17:59,503 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163989263] [2021-11-02 22:17:59,504 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:17:59,504 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:17:59,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:17:59,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:17:59,505 INFO L87 Difference]: Start difference. First operand 237 states and 258 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:18:00,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:18:00,057 INFO L93 Difference]: Finished difference Result 235 states and 256 transitions. [2021-11-02 22:18:00,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:18:00,058 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-11-02 22:18:00,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:18:00,061 INFO L225 Difference]: With dead ends: 235 [2021-11-02 22:18:00,061 INFO L226 Difference]: Without dead ends: 235 [2021-11-02 22:18:00,061 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:18:00,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2021-11-02 22:18:00,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 235. [2021-11-02 22:18:00,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 123 states have (on average 1.7642276422764227) internal successors, (217), 208 states have internal predecessors, (217), 24 states have call successors, (24), 11 states have call predecessors, (24), 9 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-02 22:18:00,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 256 transitions. [2021-11-02 22:18:00,091 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 256 transitions. Word has length 14 [2021-11-02 22:18:00,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:18:00,091 INFO L470 AbstractCegarLoop]: Abstraction has 235 states and 256 transitions. [2021-11-02 22:18:00,092 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:18:00,092 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 256 transitions. [2021-11-02 22:18:00,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-02 22:18:00,093 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:18:00,093 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:18:00,094 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-02 22:18:00,094 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting chain_nodeErr0REQUIRES_VIOLATION === [remove_fw_linkErr0REQUIRES_VIOLATION, remove_fw_linkErr1REQUIRES_VIOLATION, remove_fw_linkErr2REQUIRES_VIOLATION, remove_fw_linkErr3REQUIRES_VIOLATION (and 79 more)] === [2021-11-02 22:18:00,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:18:00,096 INFO L85 PathProgramCache]: Analyzing trace with hash 1703543133, now seen corresponding path program 1 times [2021-11-02 22:18:00,096 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:18:00,097 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60374904] [2021-11-02 22:18:00,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:18:00,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:18:00,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:00,269 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:18:00,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:00,305 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 22:18:00,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:00,410 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:18:00,410 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:18:00,411 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60374904] [2021-11-02 22:18:00,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60374904] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:18:00,417 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:18:00,418 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:18:00,418 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329452079] [2021-11-02 22:18:00,418 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:18:00,419 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:18:00,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:18:00,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:18:00,420 INFO L87 Difference]: Start difference. First operand 235 states and 256 transitions. Second operand has 9 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:18:01,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:18:01,719 INFO L93 Difference]: Finished difference Result 265 states and 290 transitions. [2021-11-02 22:18:01,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:18:01,720 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-11-02 22:18:01,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:18:01,724 INFO L225 Difference]: With dead ends: 265 [2021-11-02 22:18:01,724 INFO L226 Difference]: Without dead ends: 265 [2021-11-02 22:18:01,724 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:18:01,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2021-11-02 22:18:01,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 230. [2021-11-02 22:18:01,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 123 states have (on average 1.7235772357723578) internal successors, (212), 203 states have internal predecessors, (212), 24 states have call successors, (24), 11 states have call predecessors, (24), 9 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-02 22:18:01,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 251 transitions. [2021-11-02 22:18:01,746 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 251 transitions. Word has length 20 [2021-11-02 22:18:01,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:18:01,746 INFO L470 AbstractCegarLoop]: Abstraction has 230 states and 251 transitions. [2021-11-02 22:18:01,747 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:18:01,747 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 251 transitions. [2021-11-02 22:18:01,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-02 22:18:01,748 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:18:01,748 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:18:01,748 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-02 22:18:01,748 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting chain_nodeErr1REQUIRES_VIOLATION === [remove_fw_linkErr0REQUIRES_VIOLATION, remove_fw_linkErr1REQUIRES_VIOLATION, remove_fw_linkErr2REQUIRES_VIOLATION, remove_fw_linkErr3REQUIRES_VIOLATION (and 79 more)] === [2021-11-02 22:18:01,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:18:01,749 INFO L85 PathProgramCache]: Analyzing trace with hash 1703543134, now seen corresponding path program 1 times [2021-11-02 22:18:01,749 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:18:01,749 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [287052608] [2021-11-02 22:18:01,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:18:01,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:18:01,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:01,884 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:18:01,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:01,910 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 22:18:01,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:01,983 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:18:01,984 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:18:01,984 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [287052608] [2021-11-02 22:18:01,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [287052608] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:18:01,985 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:18:01,985 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-02 22:18:01,985 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562383182] [2021-11-02 22:18:01,986 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:18:01,986 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:18:01,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:18:01,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:18:01,987 INFO L87 Difference]: Start difference. First operand 230 states and 251 transitions. Second operand has 10 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:18:03,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:18:03,381 INFO L93 Difference]: Finished difference Result 276 states and 301 transitions. [2021-11-02 22:18:03,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:18:03,382 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-11-02 22:18:03,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:18:03,385 INFO L225 Difference]: With dead ends: 276 [2021-11-02 22:18:03,385 INFO L226 Difference]: Without dead ends: 276 [2021-11-02 22:18:03,386 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2021-11-02 22:18:03,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2021-11-02 22:18:03,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 240. [2021-11-02 22:18:03,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 240 states, 130 states have (on average 1.7) internal successors, (221), 211 states have internal predecessors, (221), 26 states have call successors, (26), 12 states have call predecessors, (26), 10 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-02 22:18:03,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 264 transitions. [2021-11-02 22:18:03,399 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 264 transitions. Word has length 20 [2021-11-02 22:18:03,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:18:03,400 INFO L470 AbstractCegarLoop]: Abstraction has 240 states and 264 transitions. [2021-11-02 22:18:03,400 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:18:03,400 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 264 transitions. [2021-11-02 22:18:03,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-02 22:18:03,401 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:18:03,401 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:18:03,402 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-02 22:18:03,402 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting chain_nodeErr2REQUIRES_VIOLATION === [remove_fw_linkErr0REQUIRES_VIOLATION, remove_fw_linkErr1REQUIRES_VIOLATION, remove_fw_linkErr2REQUIRES_VIOLATION, remove_fw_linkErr3REQUIRES_VIOLATION (and 79 more)] === [2021-11-02 22:18:03,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:18:03,403 INFO L85 PathProgramCache]: Analyzing trace with hash 1270229956, now seen corresponding path program 1 times [2021-11-02 22:18:03,403 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:18:03,403 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445132146] [2021-11-02 22:18:03,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:18:03,404 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:18:03,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:03,457 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:18:03,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:03,479 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 22:18:03,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:03,517 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:18:03,517 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:18:03,517 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445132146] [2021-11-02 22:18:03,518 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1445132146] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:18:03,518 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:18:03,518 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:18:03,519 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056014016] [2021-11-02 22:18:03,520 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:18:03,520 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:18:03,521 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:18:03,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:18:03,521 INFO L87 Difference]: Start difference. First operand 240 states and 264 transitions. Second operand has 8 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:18:04,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:18:04,471 INFO L93 Difference]: Finished difference Result 273 states and 299 transitions. [2021-11-02 22:18:04,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:18:04,471 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 21 [2021-11-02 22:18:04,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:18:04,476 INFO L225 Difference]: With dead ends: 273 [2021-11-02 22:18:04,478 INFO L226 Difference]: Without dead ends: 273 [2021-11-02 22:18:04,478 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:18:04,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2021-11-02 22:18:04,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 239. [2021-11-02 22:18:04,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 130 states have (on average 1.6846153846153846) internal successors, (219), 210 states have internal predecessors, (219), 26 states have call successors, (26), 12 states have call predecessors, (26), 10 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-02 22:18:04,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 262 transitions. [2021-11-02 22:18:04,501 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 262 transitions. Word has length 21 [2021-11-02 22:18:04,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:18:04,501 INFO L470 AbstractCegarLoop]: Abstraction has 239 states and 262 transitions. [2021-11-02 22:18:04,502 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:18:04,502 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 262 transitions. [2021-11-02 22:18:04,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-02 22:18:04,504 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:18:04,504 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:18:04,504 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-02 22:18:04,505 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting chain_nodeErr3REQUIRES_VIOLATION === [remove_fw_linkErr0REQUIRES_VIOLATION, remove_fw_linkErr1REQUIRES_VIOLATION, remove_fw_linkErr2REQUIRES_VIOLATION, remove_fw_linkErr3REQUIRES_VIOLATION (and 79 more)] === [2021-11-02 22:18:04,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:18:04,505 INFO L85 PathProgramCache]: Analyzing trace with hash 1270229957, now seen corresponding path program 1 times [2021-11-02 22:18:04,505 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:18:04,513 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537968669] [2021-11-02 22:18:04,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:18:04,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:18:04,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:04,637 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:18:04,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:04,656 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 22:18:04,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:04,701 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:18:04,702 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:18:04,702 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537968669] [2021-11-02 22:18:04,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [537968669] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:18:04,703 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:18:04,703 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:18:04,703 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073861486] [2021-11-02 22:18:04,704 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:18:04,704 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:18:04,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:18:04,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:18:04,705 INFO L87 Difference]: Start difference. First operand 239 states and 262 transitions. Second operand has 8 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:18:05,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:18:05,683 INFO L93 Difference]: Finished difference Result 272 states and 297 transitions. [2021-11-02 22:18:05,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:18:05,684 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 21 [2021-11-02 22:18:05,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:18:05,689 INFO L225 Difference]: With dead ends: 272 [2021-11-02 22:18:05,689 INFO L226 Difference]: Without dead ends: 272 [2021-11-02 22:18:05,690 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:18:05,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2021-11-02 22:18:05,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 238. [2021-11-02 22:18:05,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 130 states have (on average 1.6692307692307693) internal successors, (217), 209 states have internal predecessors, (217), 26 states have call successors, (26), 12 states have call predecessors, (26), 10 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-02 22:18:05,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 260 transitions. [2021-11-02 22:18:05,713 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 260 transitions. Word has length 21 [2021-11-02 22:18:05,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:18:05,714 INFO L470 AbstractCegarLoop]: Abstraction has 238 states and 260 transitions. [2021-11-02 22:18:05,714 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:18:05,714 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 260 transitions. [2021-11-02 22:18:05,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-02 22:18:05,716 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:18:05,716 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:18:05,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-02 22:18:05,716 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting create_sllErr1REQUIRES_VIOLATION === [remove_fw_linkErr0REQUIRES_VIOLATION, remove_fw_linkErr1REQUIRES_VIOLATION, remove_fw_linkErr2REQUIRES_VIOLATION, remove_fw_linkErr3REQUIRES_VIOLATION (and 79 more)] === [2021-11-02 22:18:05,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:18:05,717 INFO L85 PathProgramCache]: Analyzing trace with hash 1907624827, now seen corresponding path program 1 times [2021-11-02 22:18:05,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:18:05,718 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214317131] [2021-11-02 22:18:05,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:18:05,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:18:05,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:05,793 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:18:05,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:05,814 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-02 22:18:05,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:05,907 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:05,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:05,918 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:18:05,919 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:18:05,919 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1214317131] [2021-11-02 22:18:05,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1214317131] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:18:05,919 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:18:05,920 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:18:05,920 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826451062] [2021-11-02 22:18:05,920 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:18:05,921 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:18:05,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:18:05,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:18:05,922 INFO L87 Difference]: Start difference. First operand 238 states and 260 transitions. Second operand has 9 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:18:06,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:18:06,838 INFO L93 Difference]: Finished difference Result 269 states and 294 transitions. [2021-11-02 22:18:06,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:18:06,839 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 28 [2021-11-02 22:18:06,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:18:06,842 INFO L225 Difference]: With dead ends: 269 [2021-11-02 22:18:06,842 INFO L226 Difference]: Without dead ends: 269 [2021-11-02 22:18:06,842 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:18:06,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2021-11-02 22:18:06,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 235. [2021-11-02 22:18:06,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 130 states have (on average 1.646153846153846) internal successors, (214), 206 states have internal predecessors, (214), 26 states have call successors, (26), 12 states have call predecessors, (26), 10 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-02 22:18:06,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 257 transitions. [2021-11-02 22:18:06,855 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 257 transitions. Word has length 28 [2021-11-02 22:18:06,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:18:06,856 INFO L470 AbstractCegarLoop]: Abstraction has 235 states and 257 transitions. [2021-11-02 22:18:06,856 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:18:06,856 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 257 transitions. [2021-11-02 22:18:06,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-02 22:18:06,858 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:18:06,858 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:18:06,858 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-02 22:18:06,858 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting create_sllErr2REQUIRES_VIOLATION === [remove_fw_linkErr0REQUIRES_VIOLATION, remove_fw_linkErr1REQUIRES_VIOLATION, remove_fw_linkErr2REQUIRES_VIOLATION, remove_fw_linkErr3REQUIRES_VIOLATION (and 79 more)] === [2021-11-02 22:18:06,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:18:06,860 INFO L85 PathProgramCache]: Analyzing trace with hash -993172203, now seen corresponding path program 1 times [2021-11-02 22:18:06,861 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:18:06,861 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794861739] [2021-11-02 22:18:06,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:18:06,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:18:06,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:07,007 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:18:07,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:07,029 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-02 22:18:07,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:07,100 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:07,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:07,205 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:18:07,205 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:18:07,206 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794861739] [2021-11-02 22:18:07,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1794861739] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:18:07,206 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:18:07,206 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 22:18:07,207 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731385685] [2021-11-02 22:18:07,207 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:18:07,207 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:18:07,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:18:07,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:18:07,209 INFO L87 Difference]: Start difference. First operand 235 states and 257 transitions. Second operand has 12 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 4 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:18:08,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:18:08,267 INFO L93 Difference]: Finished difference Result 274 states and 300 transitions. [2021-11-02 22:18:08,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:18:08,268 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 4 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 29 [2021-11-02 22:18:08,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:18:08,271 INFO L225 Difference]: With dead ends: 274 [2021-11-02 22:18:08,271 INFO L226 Difference]: Without dead ends: 274 [2021-11-02 22:18:08,271 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2021-11-02 22:18:08,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2021-11-02 22:18:08,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 228. [2021-11-02 22:18:08,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 130 states have (on average 1.5923076923076922) internal successors, (207), 199 states have internal predecessors, (207), 26 states have call successors, (26), 12 states have call predecessors, (26), 10 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-02 22:18:08,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 250 transitions. [2021-11-02 22:18:08,291 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 250 transitions. Word has length 29 [2021-11-02 22:18:08,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:18:08,291 INFO L470 AbstractCegarLoop]: Abstraction has 228 states and 250 transitions. [2021-11-02 22:18:08,292 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 4 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:18:08,292 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 250 transitions. [2021-11-02 22:18:08,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-02 22:18:08,297 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:18:08,297 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:18:08,298 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-02 22:18:08,298 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting create_sllErr3REQUIRES_VIOLATION === [remove_fw_linkErr0REQUIRES_VIOLATION, remove_fw_linkErr1REQUIRES_VIOLATION, remove_fw_linkErr2REQUIRES_VIOLATION, remove_fw_linkErr3REQUIRES_VIOLATION (and 79 more)] === [2021-11-02 22:18:08,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:18:08,299 INFO L85 PathProgramCache]: Analyzing trace with hash -993172202, now seen corresponding path program 1 times [2021-11-02 22:18:08,299 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:18:08,301 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1612923278] [2021-11-02 22:18:08,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:18:08,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:18:08,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:08,475 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:18:08,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:08,501 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-02 22:18:08,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:08,626 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:08,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:08,727 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:18:08,728 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:18:08,728 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1612923278] [2021-11-02 22:18:08,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1612923278] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:18:08,728 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:18:08,729 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 22:18:08,729 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353954985] [2021-11-02 22:18:08,729 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:18:08,730 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:18:08,730 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:18:08,730 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:18:08,731 INFO L87 Difference]: Start difference. First operand 228 states and 250 transitions. Second operand has 12 states, 8 states have (on average 2.625) internal successors, (21), 9 states have internal predecessors, (21), 4 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:18:09,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:18:09,739 INFO L93 Difference]: Finished difference Result 261 states and 286 transitions. [2021-11-02 22:18:09,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:18:09,739 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 8 states have (on average 2.625) internal successors, (21), 9 states have internal predecessors, (21), 4 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 29 [2021-11-02 22:18:09,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:18:09,742 INFO L225 Difference]: With dead ends: 261 [2021-11-02 22:18:09,742 INFO L226 Difference]: Without dead ends: 261 [2021-11-02 22:18:09,742 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:18:09,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-11-02 22:18:09,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 227. [2021-11-02 22:18:09,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 130 states have (on average 1.5846153846153845) internal successors, (206), 198 states have internal predecessors, (206), 26 states have call successors, (26), 12 states have call predecessors, (26), 10 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-02 22:18:09,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 249 transitions. [2021-11-02 22:18:09,753 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 249 transitions. Word has length 29 [2021-11-02 22:18:09,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:18:09,754 INFO L470 AbstractCegarLoop]: Abstraction has 227 states and 249 transitions. [2021-11-02 22:18:09,754 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 8 states have (on average 2.625) internal successors, (21), 9 states have internal predecessors, (21), 4 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:18:09,754 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 249 transitions. [2021-11-02 22:18:09,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-02 22:18:09,755 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:18:09,756 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:18:09,756 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-02 22:18:09,756 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting chain_nodeErr1REQUIRES_VIOLATION === [remove_fw_linkErr0REQUIRES_VIOLATION, remove_fw_linkErr1REQUIRES_VIOLATION, remove_fw_linkErr2REQUIRES_VIOLATION, remove_fw_linkErr3REQUIRES_VIOLATION (and 79 more)] === [2021-11-02 22:18:09,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:18:09,757 INFO L85 PathProgramCache]: Analyzing trace with hash 1233940095, now seen corresponding path program 1 times [2021-11-02 22:18:09,757 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:18:09,757 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [154268561] [2021-11-02 22:18:09,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:18:09,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:18:09,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:09,906 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:18:09,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:09,938 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-02 22:18:09,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:10,008 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:10,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:10,019 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-11-02 22:18:10,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:10,093 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:18:10,094 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:18:10,094 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [154268561] [2021-11-02 22:18:10,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [154268561] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:18:10,095 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1974639415] [2021-11-02 22:18:10,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:18:10,095 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:18:10,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:18:10,104 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:18:10,112 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-02 22:18:10,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:10,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-02 22:18:10,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:18:10,859 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-02 22:18:11,054 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:18:11,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 19 [2021-11-02 22:18:11,152 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:18:11,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1974639415] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:18:11,153 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:18:11,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10] total 21 [2021-11-02 22:18:11,154 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633475219] [2021-11-02 22:18:11,156 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-02 22:18:11,156 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:18:11,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-02 22:18:11,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2021-11-02 22:18:11,158 INFO L87 Difference]: Start difference. First operand 227 states and 249 transitions. Second operand has 22 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 17 states have internal predecessors, (53), 8 states have call successors, (12), 6 states have call predecessors, (12), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-02 22:18:13,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:18:13,273 INFO L93 Difference]: Finished difference Result 259 states and 284 transitions. [2021-11-02 22:18:13,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:18:13,274 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 17 states have internal predecessors, (53), 8 states have call successors, (12), 6 states have call predecessors, (12), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 42 [2021-11-02 22:18:13,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:18:13,277 INFO L225 Difference]: With dead ends: 259 [2021-11-02 22:18:13,277 INFO L226 Difference]: Without dead ends: 259 [2021-11-02 22:18:13,278 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=139, Invalid=731, Unknown=0, NotChecked=0, Total=870 [2021-11-02 22:18:13,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2021-11-02 22:18:13,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 225. [2021-11-02 22:18:13,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 130 states have (on average 1.5692307692307692) internal successors, (204), 196 states have internal predecessors, (204), 26 states have call successors, (26), 12 states have call predecessors, (26), 10 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-02 22:18:13,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 247 transitions. [2021-11-02 22:18:13,295 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 247 transitions. Word has length 42 [2021-11-02 22:18:13,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:18:13,296 INFO L470 AbstractCegarLoop]: Abstraction has 225 states and 247 transitions. [2021-11-02 22:18:13,296 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 17 states have internal predecessors, (53), 8 states have call successors, (12), 6 states have call predecessors, (12), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-02 22:18:13,296 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 247 transitions. [2021-11-02 22:18:13,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-02 22:18:13,302 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:18:13,302 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:18:13,351 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-02 22:18:13,518 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:18:13,518 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting create_sllErr6REQUIRES_VIOLATION === [remove_fw_linkErr0REQUIRES_VIOLATION, remove_fw_linkErr1REQUIRES_VIOLATION, remove_fw_linkErr2REQUIRES_VIOLATION, remove_fw_linkErr3REQUIRES_VIOLATION (and 79 more)] === [2021-11-02 22:18:13,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:18:13,518 INFO L85 PathProgramCache]: Analyzing trace with hash 97728854, now seen corresponding path program 1 times [2021-11-02 22:18:13,518 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:18:13,519 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1922706214] [2021-11-02 22:18:13,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:18:13,519 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:18:13,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:13,709 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:18:13,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:13,734 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-02 22:18:13,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:13,821 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:13,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:13,960 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-11-02 22:18:13,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:14,021 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:14,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:14,152 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 22:18:14,153 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:18:14,153 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1922706214] [2021-11-02 22:18:14,153 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1922706214] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:18:14,154 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [858517550] [2021-11-02 22:18:14,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:18:14,154 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:18:14,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:18:14,155 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:18:14,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-02 22:18:14,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:14,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-02 22:18:14,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:18:14,433 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:18:14,433 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-02 22:18:14,543 INFO L354 Elim1Store]: treesize reduction 36, result has 23.4 percent of original size [2021-11-02 22:18:14,544 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 17 treesize of output 22 [2021-11-02 22:18:14,614 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-02 22:18:14,614 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 19 treesize of output 13 [2021-11-02 22:18:14,948 INFO L354 Elim1Store]: treesize reduction 66, result has 19.5 percent of original size [2021-11-02 22:18:14,948 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 27 treesize of output 35 [2021-11-02 22:18:15,462 INFO L354 Elim1Store]: treesize reduction 66, result has 19.5 percent of original size [2021-11-02 22:18:15,463 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 27 treesize of output 35 [2021-11-02 22:18:15,624 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 22:18:15,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [858517550] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:18:15,625 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:18:15,625 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10] total 23 [2021-11-02 22:18:15,625 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842801455] [2021-11-02 22:18:15,626 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-02 22:18:15,626 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:18:15,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-02 22:18:15,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:18:15,628 INFO L87 Difference]: Start difference. First operand 225 states and 247 transitions. Second operand has 24 states, 19 states have (on average 3.9473684210526314) internal successors, (75), 20 states have internal predecessors, (75), 8 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (9), 8 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-02 22:18:17,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:18:17,610 INFO L93 Difference]: Finished difference Result 260 states and 284 transitions. [2021-11-02 22:18:17,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:18:17,611 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 19 states have (on average 3.9473684210526314) internal successors, (75), 20 states have internal predecessors, (75), 8 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (9), 8 states have call predecessors, (9), 6 states have call successors, (9) Word has length 51 [2021-11-02 22:18:17,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:18:17,617 INFO L225 Difference]: With dead ends: 260 [2021-11-02 22:18:17,617 INFO L226 Difference]: Without dead ends: 260 [2021-11-02 22:18:17,618 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 49 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=164, Invalid=892, Unknown=0, NotChecked=0, Total=1056 [2021-11-02 22:18:17,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-11-02 22:18:17,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 224. [2021-11-02 22:18:17,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 130 states have (on average 1.5615384615384615) internal successors, (203), 195 states have internal predecessors, (203), 26 states have call successors, (26), 12 states have call predecessors, (26), 10 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-02 22:18:17,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 246 transitions. [2021-11-02 22:18:17,629 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 246 transitions. Word has length 51 [2021-11-02 22:18:17,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:18:17,630 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 246 transitions. [2021-11-02 22:18:17,631 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 19 states have (on average 3.9473684210526314) internal successors, (75), 20 states have internal predecessors, (75), 8 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (9), 8 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-02 22:18:17,631 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 246 transitions. [2021-11-02 22:18:17,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-02 22:18:17,638 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:18:17,638 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:18:17,684 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-02 22:18:17,851 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-02 22:18:17,851 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting create_sllErr7REQUIRES_VIOLATION === [remove_fw_linkErr0REQUIRES_VIOLATION, remove_fw_linkErr1REQUIRES_VIOLATION, remove_fw_linkErr2REQUIRES_VIOLATION, remove_fw_linkErr3REQUIRES_VIOLATION (and 79 more)] === [2021-11-02 22:18:17,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:18:17,852 INFO L85 PathProgramCache]: Analyzing trace with hash 97728855, now seen corresponding path program 1 times [2021-11-02 22:18:17,852 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:18:17,852 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1548004438] [2021-11-02 22:18:17,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:18:17,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:18:17,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:18,100 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:18:18,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:18,123 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-02 22:18:18,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:18,190 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:18,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:18,273 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-11-02 22:18:18,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:18,303 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:18,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:18,399 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-02 22:18:18,399 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:18:18,399 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1548004438] [2021-11-02 22:18:18,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1548004438] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:18:18,400 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:18:18,400 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 22:18:18,400 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10475447] [2021-11-02 22:18:18,401 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:18:18,401 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:18:18,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:18:18,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:18:18,402 INFO L87 Difference]: Start difference. First operand 224 states and 246 transitions. Second operand has 12 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 4 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:18:19,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:18:19,452 INFO L93 Difference]: Finished difference Result 250 states and 275 transitions. [2021-11-02 22:18:19,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:18:19,453 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 4 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 51 [2021-11-02 22:18:19,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:18:19,455 INFO L225 Difference]: With dead ends: 250 [2021-11-02 22:18:19,456 INFO L226 Difference]: Without dead ends: 250 [2021-11-02 22:18:19,456 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:18:19,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2021-11-02 22:18:19,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 216. [2021-11-02 22:18:19,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 130 states have (on average 1.5) internal successors, (195), 187 states have internal predecessors, (195), 26 states have call successors, (26), 12 states have call predecessors, (26), 10 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-02 22:18:19,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 238 transitions. [2021-11-02 22:18:19,466 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 238 transitions. Word has length 51 [2021-11-02 22:18:19,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:18:19,467 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 238 transitions. [2021-11-02 22:18:19,467 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 4 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:18:19,467 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 238 transitions. [2021-11-02 22:18:19,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-02 22:18:19,468 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:18:19,469 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-02 22:18:19,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-02 22:18:19,469 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting mainErr0REQUIRES_VIOLATION === [remove_fw_linkErr0REQUIRES_VIOLATION, remove_fw_linkErr1REQUIRES_VIOLATION, remove_fw_linkErr2REQUIRES_VIOLATION, remove_fw_linkErr3REQUIRES_VIOLATION (and 79 more)] === [2021-11-02 22:18:19,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:18:19,470 INFO L85 PathProgramCache]: Analyzing trace with hash -546292810, now seen corresponding path program 1 times [2021-11-02 22:18:19,470 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:18:19,470 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942666832] [2021-11-02 22:18:19,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:18:19,471 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:18:19,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:19,602 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:18:19,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:19,621 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:18:19,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:19,791 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:19,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:19,805 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:19,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:19,812 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-02 22:18:19,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:19,825 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:19,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:19,832 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-11-02 22:18:19,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:19,919 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:19,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:20,023 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-02 22:18:20,025 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:18:20,039 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942666832] [2021-11-02 22:18:20,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1942666832] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:18:20,040 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:18:20,040 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-02 22:18:20,043 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472902900] [2021-11-02 22:18:20,046 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-02 22:18:20,046 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:18:20,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-02 22:18:20,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:18:20,048 INFO L87 Difference]: Start difference. First operand 216 states and 238 transitions. Second operand has 13 states, 10 states have (on average 4.8) internal successors, (48), 11 states have internal predecessors, (48), 5 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-02 22:18:21,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:18:21,295 INFO L93 Difference]: Finished difference Result 255 states and 281 transitions. [2021-11-02 22:18:21,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:18:21,295 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 4.8) internal successors, (48), 11 states have internal predecessors, (48), 5 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 78 [2021-11-02 22:18:21,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:18:21,298 INFO L225 Difference]: With dead ends: 255 [2021-11-02 22:18:21,298 INFO L226 Difference]: Without dead ends: 255 [2021-11-02 22:18:21,299 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:18:21,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-11-02 22:18:21,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 209. [2021-11-02 22:18:21,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 130 states have (on average 1.4461538461538461) internal successors, (188), 180 states have internal predecessors, (188), 26 states have call successors, (26), 12 states have call predecessors, (26), 10 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-02 22:18:21,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 231 transitions. [2021-11-02 22:18:21,309 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 231 transitions. Word has length 78 [2021-11-02 22:18:21,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:18:21,310 INFO L470 AbstractCegarLoop]: Abstraction has 209 states and 231 transitions. [2021-11-02 22:18:21,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 4.8) internal successors, (48), 11 states have internal predecessors, (48), 5 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-02 22:18:21,311 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 231 transitions. [2021-11-02 22:18:21,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-02 22:18:21,312 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:18:21,312 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-02 22:18:21,312 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-02 22:18:21,313 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting mainErr3REQUIRES_VIOLATION === [remove_fw_linkErr0REQUIRES_VIOLATION, remove_fw_linkErr1REQUIRES_VIOLATION, remove_fw_linkErr2REQUIRES_VIOLATION, remove_fw_linkErr3REQUIRES_VIOLATION (and 79 more)] === [2021-11-02 22:18:21,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:18:21,313 INFO L85 PathProgramCache]: Analyzing trace with hash 244792139, now seen corresponding path program 1 times [2021-11-02 22:18:21,313 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:18:21,314 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044319164] [2021-11-02 22:18:21,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:18:21,314 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:18:21,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:21,520 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:18:21,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:21,539 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:18:21,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:21,661 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:21,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:21,673 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:21,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:21,680 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-02 22:18:21,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:21,743 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:21,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:21,829 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-11-02 22:18:21,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:21,860 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:21,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:21,911 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-02 22:18:21,911 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:18:21,911 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044319164] [2021-11-02 22:18:21,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044319164] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:18:21,912 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:18:21,912 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-02 22:18:21,912 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511845313] [2021-11-02 22:18:21,913 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-02 22:18:21,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:18:21,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-02 22:18:21,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:18:21,914 INFO L87 Difference]: Start difference. First operand 209 states and 231 transitions. Second operand has 13 states, 10 states have (on average 4.9) internal successors, (49), 11 states have internal predecessors, (49), 6 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-02 22:18:22,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:18:22,918 INFO L93 Difference]: Finished difference Result 236 states and 261 transitions. [2021-11-02 22:18:22,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:18:22,919 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 4.9) internal successors, (49), 11 states have internal predecessors, (49), 6 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) Word has length 79 [2021-11-02 22:18:22,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:18:22,922 INFO L225 Difference]: With dead ends: 236 [2021-11-02 22:18:22,922 INFO L226 Difference]: Without dead ends: 236 [2021-11-02 22:18:22,922 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:18:22,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-11-02 22:18:22,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 202. [2021-11-02 22:18:22,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 130 states have (on average 1.3923076923076922) internal successors, (181), 173 states have internal predecessors, (181), 26 states have call successors, (26), 12 states have call predecessors, (26), 10 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-02 22:18:22,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 224 transitions. [2021-11-02 22:18:22,933 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 224 transitions. Word has length 79 [2021-11-02 22:18:22,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:18:22,934 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 224 transitions. [2021-11-02 22:18:22,934 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 4.9) internal successors, (49), 11 states have internal predecessors, (49), 6 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-02 22:18:22,934 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 224 transitions. [2021-11-02 22:18:22,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-02 22:18:22,935 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:18:22,936 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-02 22:18:22,936 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-02 22:18:22,936 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting mainErr2REQUIRES_VIOLATION === [remove_fw_linkErr0REQUIRES_VIOLATION, remove_fw_linkErr1REQUIRES_VIOLATION, remove_fw_linkErr2REQUIRES_VIOLATION, remove_fw_linkErr3REQUIRES_VIOLATION (and 79 more)] === [2021-11-02 22:18:22,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:18:22,937 INFO L85 PathProgramCache]: Analyzing trace with hash 244792138, now seen corresponding path program 1 times [2021-11-02 22:18:22,937 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:18:22,937 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [917140883] [2021-11-02 22:18:22,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:18:22,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:18:23,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:23,083 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:18:23,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:23,104 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:18:23,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:23,348 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:23,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:23,361 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:23,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:23,367 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-02 22:18:23,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:23,430 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:23,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:23,524 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-11-02 22:18:23,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:23,549 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:23,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:23,612 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-02 22:18:23,612 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:18:23,612 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [917140883] [2021-11-02 22:18:23,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [917140883] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:18:23,613 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:18:23,613 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-11-02 22:18:23,613 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712758946] [2021-11-02 22:18:23,614 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-02 22:18:23,614 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:18:23,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-02 22:18:23,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:18:23,615 INFO L87 Difference]: Start difference. First operand 202 states and 224 transitions. Second operand has 14 states, 11 states have (on average 4.454545454545454) internal successors, (49), 12 states have internal predecessors, (49), 6 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-02 22:18:24,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:18:24,990 INFO L93 Difference]: Finished difference Result 247 states and 273 transitions. [2021-11-02 22:18:24,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:18:24,991 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 4.454545454545454) internal successors, (49), 12 states have internal predecessors, (49), 6 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) Word has length 79 [2021-11-02 22:18:24,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:18:24,993 INFO L225 Difference]: With dead ends: 247 [2021-11-02 22:18:24,993 INFO L226 Difference]: Without dead ends: 247 [2021-11-02 22:18:24,994 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=69, Invalid=273, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:18:24,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-11-02 22:18:25,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 201. [2021-11-02 22:18:25,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 130 states have (on average 1.3846153846153846) internal successors, (180), 172 states have internal predecessors, (180), 26 states have call successors, (26), 12 states have call predecessors, (26), 10 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-02 22:18:25,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 223 transitions. [2021-11-02 22:18:25,004 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 223 transitions. Word has length 79 [2021-11-02 22:18:25,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:18:25,004 INFO L470 AbstractCegarLoop]: Abstraction has 201 states and 223 transitions. [2021-11-02 22:18:25,005 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 4.454545454545454) internal successors, (49), 12 states have internal predecessors, (49), 6 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-02 22:18:25,005 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 223 transitions. [2021-11-02 22:18:25,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-02 22:18:25,006 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:18:25,006 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-02 22:18:25,006 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-02 22:18:25,007 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting failErr0ASSERT_VIOLATIONMEMORY_LEAK === [remove_fw_linkErr0REQUIRES_VIOLATION, remove_fw_linkErr1REQUIRES_VIOLATION, remove_fw_linkErr2REQUIRES_VIOLATION, remove_fw_linkErr3REQUIRES_VIOLATION (and 79 more)] === [2021-11-02 22:18:25,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:18:25,007 INFO L85 PathProgramCache]: Analyzing trace with hash -1098510553, now seen corresponding path program 1 times [2021-11-02 22:18:25,008 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:18:25,008 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1248568273] [2021-11-02 22:18:25,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:18:25,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:18:25,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:25,216 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:18:25,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:25,243 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:18:25,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:25,453 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:25,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:25,466 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:25,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:25,472 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-02 22:18:25,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:25,583 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:25,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:25,670 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-11-02 22:18:25,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:26,224 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:18:26,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:26,446 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 28 proven. 14 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:18:26,446 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:18:26,447 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1248568273] [2021-11-02 22:18:26,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1248568273] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:18:26,447 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770173357] [2021-11-02 22:18:26,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:18:26,447 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:18:26,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:18:26,449 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:18:26,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-02 22:18:26,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:18:26,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-02 22:18:26,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:18:27,246 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-02 22:18:27,467 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-02 22:18:27,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 19 [2021-11-02 22:18:39,491 WARN L860 $PredicateComparison]: unable to prove that (exists ((chain_node_~node~0.offset Int) (chain_node_~node~0.base Int) (|chain_node_#t~mem7.base| Int) (alloc_node_~ptr~0.offset Int) (chain_node_~ppnode.offset Int)) (and (< chain_node_~node~0.base |c_#StackHeapBarrier|) (= (let ((.cse0 (store |c_old(#memory_$Pointer$.base)| chain_node_~node~0.base (store (store (store (select |c_old(#memory_$Pointer$.base)| chain_node_~node~0.base) alloc_node_~ptr~0.offset 0) (+ 4 alloc_node_~ptr~0.offset) 0) chain_node_~node~0.offset |chain_node_#t~mem7.base|)))) (store .cse0 |c_chain_node_#in~ppnode.base| (store (select .cse0 |c_chain_node_#in~ppnode.base|) chain_node_~ppnode.offset chain_node_~node~0.base))) |c_#memory_$Pointer$.base|))) is different from true [2021-11-02 22:18:39,821 INFO L354 Elim1Store]: treesize reduction 341, result has 27.6 percent of original size [2021-11-02 22:18:39,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 6 case distinctions, treesize of input 66 treesize of output 147 [2021-11-02 22:19:15,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 787 treesize of output 786 [2021-11-02 22:20:18,734 INFO L354 Elim1Store]: treesize reduction 110, result has 57.2 percent of original size [2021-11-02 22:20:18,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 8 new quantified variables, introduced 21 case distinctions, treesize of input 349 treesize of output 340 [2021-11-02 22:20:18,753 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-02 22:20:18,754 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 340 treesize of output 340 [2021-11-02 22:20:27,739 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 32 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 2 not checked. [2021-11-02 22:20:27,739 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770173357] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:20:27,739 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:20:27,739 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29] total 46 [2021-11-02 22:20:27,740 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927628979] [2021-11-02 22:20:27,740 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-02 22:20:27,741 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:20:27,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-02 22:20:27,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1857, Unknown=5, NotChecked=86, Total=2070 [2021-11-02 22:20:27,743 INFO L87 Difference]: Start difference. First operand 201 states and 223 transitions. Second operand has 46 states, 41 states have (on average 2.5121951219512195) internal successors, (103), 39 states have internal predecessors, (103), 12 states have call successors, (19), 6 states have call predecessors, (19), 9 states have return successors, (13), 12 states have call predecessors, (13), 10 states have call successors, (13) [2021-11-02 22:21:16,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:21:16,689 INFO L93 Difference]: Finished difference Result 324 states and 371 transitions. [2021-11-02 22:21:16,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-02 22:21:16,690 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 41 states have (on average 2.5121951219512195) internal successors, (103), 39 states have internal predecessors, (103), 12 states have call successors, (19), 6 states have call predecessors, (19), 9 states have return successors, (13), 12 states have call predecessors, (13), 10 states have call successors, (13) Word has length 84 [2021-11-02 22:21:16,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:21:16,692 INFO L225 Difference]: With dead ends: 324 [2021-11-02 22:21:16,692 INFO L226 Difference]: Without dead ends: 324 [2021-11-02 22:21:16,695 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 76 SyntacticMatches, 4 SemanticMatches, 67 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 884 ImplicationChecksByTransitivity, 40.8s TimeCoverageRelationStatistics Valid=305, Invalid=4242, Unknown=13, NotChecked=132, Total=4692 [2021-11-02 22:21:16,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2021-11-02 22:21:16,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 227. [2021-11-02 22:21:16,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 152 states have (on average 1.381578947368421) internal successors, (210), 195 states have internal predecessors, (210), 28 states have call successors, (28), 13 states have call predecessors, (28), 12 states have return successors, (20), 18 states have call predecessors, (20), 19 states have call successors, (20) [2021-11-02 22:21:16,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 258 transitions. [2021-11-02 22:21:16,708 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 258 transitions. Word has length 84 [2021-11-02 22:21:16,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:21:16,709 INFO L470 AbstractCegarLoop]: Abstraction has 227 states and 258 transitions. [2021-11-02 22:21:16,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 41 states have (on average 2.5121951219512195) internal successors, (103), 39 states have internal predecessors, (103), 12 states have call successors, (19), 6 states have call predecessors, (19), 9 states have return successors, (13), 12 states have call predecessors, (13), 10 states have call successors, (13) [2021-11-02 22:21:16,710 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 258 transitions. [2021-11-02 22:21:16,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-02 22:21:16,711 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:21:16,712 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-02 22:21:16,763 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-02 22:21:16,939 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-02 22:21:16,939 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting failErr0ASSERT_VIOLATIONMEMORY_LEAK === [remove_fw_linkErr0REQUIRES_VIOLATION, remove_fw_linkErr1REQUIRES_VIOLATION, remove_fw_linkErr2REQUIRES_VIOLATION, remove_fw_linkErr3REQUIRES_VIOLATION (and 79 more)] === [2021-11-02 22:21:16,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:21:16,940 INFO L85 PathProgramCache]: Analyzing trace with hash 893534769, now seen corresponding path program 1 times [2021-11-02 22:21:16,940 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:21:16,940 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079509587] [2021-11-02 22:21:16,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:21:16,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:21:17,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:21:17,193 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:21:17,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:21:17,218 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:21:17,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:21:17,702 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:21:17,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:21:17,854 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:21:17,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:21:17,935 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-02 22:21:17,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:21:18,886 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:21:18,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:21:19,143 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-11-02 22:21:19,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:21:19,692 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:21:19,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:21:19,779 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-02 22:21:19,780 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:21:19,780 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079509587] [2021-11-02 22:21:19,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1079509587] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:21:19,780 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308869075] [2021-11-02 22:21:19,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:21:19,781 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:21:19,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:21:19,783 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:21:19,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b29e3676-fd62-4673-a55b-a033fbab7b47/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-02 22:21:20,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:21:20,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 500 conjuncts, 94 conjunts are in the unsatisfiable core [2021-11-02 22:21:20,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:21:20,783 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:21:20,784 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 19 treesize of output 18 [2021-11-02 22:21:20,887 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-02 22:21:20,888 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 18 treesize of output 14 [2021-11-02 22:21:21,202 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-02 22:21:21,453 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-02 22:21:21,454 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 19 [2021-11-02 22:21:55,114 INFO L354 Elim1Store]: treesize reduction 364, result has 22.7 percent of original size [2021-11-02 22:21:55,115 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 6 case distinctions, treesize of input 73 treesize of output 131 [2021-11-02 22:21:55,142 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-02 22:21:55,142 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 161 treesize of output 161 [2021-11-02 22:22:10,432 INFO L354 Elim1Store]: treesize reduction 226, result has 55.0 percent of original size [2021-11-02 22:22:10,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 329 treesize of output 465