./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memcleanup.prp --file ../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (memcleanup) Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/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_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/config/svcomp-MemCleanup-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/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-memcleanup) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash f8d14145608efc0a8f321a178564faff63399ecbab28641c0c2971fec318068f --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-02 22:30:21,172 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-02 22:30:21,174 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-02 22:30:21,229 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-02 22:30:21,230 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-02 22:30:21,235 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-02 22:30:21,237 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-02 22:30:21,242 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-02 22:30:21,244 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-02 22:30:21,253 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-02 22:30:21,255 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-02 22:30:21,257 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-02 22:30:21,258 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-02 22:30:21,261 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-02 22:30:21,265 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-02 22:30:21,268 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-02 22:30:21,269 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-02 22:30:21,270 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-02 22:30:21,273 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-02 22:30:21,275 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-02 22:30:21,277 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-02 22:30:21,281 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-02 22:30:21,286 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-02 22:30:21,287 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-02 22:30:21,299 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-02 22:30:21,300 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-02 22:30:21,300 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-02 22:30:21,303 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-02 22:30:21,303 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-02 22:30:21,305 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-02 22:30:21,306 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-02 22:30:21,307 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-02 22:30:21,309 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-02 22:30:21,311 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-02 22:30:21,313 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-02 22:30:21,313 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-02 22:30:21,314 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-02 22:30:21,315 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-02 22:30:21,315 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-02 22:30:21,316 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-02 22:30:21,317 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-02 22:30:21,318 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/config/svcomp-MemCleanup-32bit-Automizer_Default.epf [2021-11-02 22:30:21,369 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-02 22:30:21,370 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-02 22:30:21,371 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-02 22:30:21,371 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-02 22:30:21,380 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-02 22:30:21,380 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-02 22:30:21,381 INFO L138 SettingsManager]: * Use SBE=true [2021-11-02 22:30:21,381 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-02 22:30:21,381 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-02 22:30:21,382 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-02 22:30:21,383 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-02 22:30:21,383 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-02 22:30:21,384 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-02 22:30:21,384 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-02 22:30:21,384 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-02 22:30:21,384 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-02 22:30:21,385 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-02 22:30:21,385 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-02 22:30:21,385 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-02 22:30:21,386 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-02 22:30:21,386 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-02 22:30:21,386 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-02 22:30:21,386 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:30:21,387 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-02 22:30:21,387 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-02 22:30:21,387 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-02 22:30:21,387 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-02 22:30:21,388 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-02 22:30:21,388 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_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f8d14145608efc0a8f321a178564faff63399ecbab28641c0c2971fec318068f [2021-11-02 22:30:21,732 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-02 22:30:21,757 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-02 22:30:21,760 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-02 22:30:21,761 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-02 22:30:21,762 INFO L275 PluginConnector]: CDTParser initialized [2021-11-02 22:30:21,764 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i [2021-11-02 22:30:21,849 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/data/61c7b2dcf/6ba87edce78c499d9ab242c7f63cbdca/FLAGee6ca5e68 [2021-11-02 22:30:22,470 INFO L306 CDTParser]: Found 1 translation units. [2021-11-02 22:30:22,471 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i [2021-11-02 22:30:22,489 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/data/61c7b2dcf/6ba87edce78c499d9ab242c7f63cbdca/FLAGee6ca5e68 [2021-11-02 22:30:22,718 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/data/61c7b2dcf/6ba87edce78c499d9ab242c7f63cbdca [2021-11-02 22:30:22,723 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-02 22:30:22,727 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-02 22:30:22,731 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-02 22:30:22,732 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-02 22:30:22,736 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-02 22:30:22,738 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:30:22" (1/1) ... [2021-11-02 22:30:22,741 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4d4985b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:30:22, skipping insertion in model container [2021-11-02 22:30:22,741 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:30:22" (1/1) ... [2021-11-02 22:30:22,750 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-02 22:30:22,831 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-02 22:30:23,147 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_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i[22636,22649] [2021-11-02 22:30:23,197 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:30:23,217 INFO L203 MainTranslator]: Completed pre-run [2021-11-02 22:30:23,293 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_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i[22636,22649] [2021-11-02 22:30:23,340 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:30:23,379 INFO L208 MainTranslator]: Completed translation [2021-11-02 22:30:23,380 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:30:23 WrapperNode [2021-11-02 22:30:23,380 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-02 22:30:23,381 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-02 22:30:23,381 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-02 22:30:23,381 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-02 22:30:23,393 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:30:23" (1/1) ... [2021-11-02 22:30:23,393 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:30:23" (1/1) ... [2021-11-02 22:30:23,416 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:30:23" (1/1) ... [2021-11-02 22:30:23,417 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:30:23" (1/1) ... [2021-11-02 22:30:23,465 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:30:23" (1/1) ... [2021-11-02 22:30:23,476 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:30:23" (1/1) ... [2021-11-02 22:30:23,481 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:30:23" (1/1) ... [2021-11-02 22:30:23,491 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-02 22:30:23,493 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-02 22:30:23,493 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-02 22:30:23,493 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-02 22:30:23,494 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:30:23" (1/1) ... [2021-11-02 22:30:23,520 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:30:23,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:30:23,546 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-02 22:30:23,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-02 22:30:23,601 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-02 22:30:23,601 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-02 22:30:23,601 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-11-02 22:30:23,601 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-02 22:30:23,602 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-02 22:30:23,602 INFO L138 BoogieDeclarations]: Found implementation of procedure fail [2021-11-02 22:30:23,602 INFO L138 BoogieDeclarations]: Found implementation of procedure alloc_node [2021-11-02 22:30:23,602 INFO L138 BoogieDeclarations]: Found implementation of procedure chain_node [2021-11-02 22:30:23,602 INFO L138 BoogieDeclarations]: Found implementation of procedure create_sll [2021-11-02 22:30:23,603 INFO L138 BoogieDeclarations]: Found implementation of procedure init_back_link [2021-11-02 22:30:23,603 INFO L138 BoogieDeclarations]: Found implementation of procedure reverse_dll [2021-11-02 22:30:23,603 INFO L138 BoogieDeclarations]: Found implementation of procedure remove_fw_link [2021-11-02 22:30:23,603 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_next [2021-11-02 22:30:23,603 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_prev [2021-11-02 22:30:23,604 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-02 22:30:23,604 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-02 22:30:23,604 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-11-02 22:30:23,604 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-11-02 22:30:23,605 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-11-02 22:30:23,605 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-11-02 22:30:23,605 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-02 22:30:23,605 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-02 22:30:23,605 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-02 22:30:23,606 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-02 22:30:23,606 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-02 22:30:23,606 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-02 22:30:23,606 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-02 22:30:23,606 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-02 22:30:23,606 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-02 22:30:23,607 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-02 22:30:23,607 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-02 22:30:23,607 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-02 22:30:23,607 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-02 22:30:23,607 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-02 22:30:23,608 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-02 22:30:23,608 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-02 22:30:23,608 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-02 22:30:23,608 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-02 22:30:23,608 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-02 22:30:23,609 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-02 22:30:23,609 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-02 22:30:23,609 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-02 22:30:23,609 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-02 22:30:23,609 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-02 22:30:23,610 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-02 22:30:23,610 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-02 22:30:23,610 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-02 22:30:23,610 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-02 22:30:23,610 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-02 22:30:23,611 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-02 22:30:23,611 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-02 22:30:23,611 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-02 22:30:23,611 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-02 22:30:23,611 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-02 22:30:23,612 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-02 22:30:23,612 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-02 22:30:23,612 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-02 22:30:23,612 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-02 22:30:23,612 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-02 22:30:23,613 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-02 22:30:23,613 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-02 22:30:23,613 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-02 22:30:23,613 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-02 22:30:23,613 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-02 22:30:23,613 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-02 22:30:23,614 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-02 22:30:23,614 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-02 22:30:23,614 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-02 22:30:23,614 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-02 22:30:23,614 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-02 22:30:23,614 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-02 22:30:23,614 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-02 22:30:23,615 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-02 22:30:23,615 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-02 22:30:23,615 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-02 22:30:23,615 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-02 22:30:23,615 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-02 22:30:23,615 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2021-11-02 22:30:23,615 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-02 22:30:23,616 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-02 22:30:23,616 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-02 22:30:23,616 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-02 22:30:23,616 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-02 22:30:23,616 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-02 22:30:23,616 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-02 22:30:23,616 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-02 22:30:23,617 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-02 22:30:23,617 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-02 22:30:23,617 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-02 22:30:23,617 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-02 22:30:23,617 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-02 22:30:23,617 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-02 22:30:23,617 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-02 22:30:23,617 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-02 22:30:23,618 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-02 22:30:23,618 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-02 22:30:23,618 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-02 22:30:23,618 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-02 22:30:23,618 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-02 22:30:23,618 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-02 22:30:23,618 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-02 22:30:23,619 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-02 22:30:23,619 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-02 22:30:23,619 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-02 22:30:23,619 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-02 22:30:23,619 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-02 22:30:23,620 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-02 22:30:23,620 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-02 22:30:23,620 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-02 22:30:23,620 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-02 22:30:23,621 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-02 22:30:23,621 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-02 22:30:23,622 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-02 22:30:23,622 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-02 22:30:23,623 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-02 22:30:23,623 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-02 22:30:23,623 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-02 22:30:23,623 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-02 22:30:23,623 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-02 22:30:23,623 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-02 22:30:23,624 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-02 22:30:23,624 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-02 22:30:23,624 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-11-02 22:30:23,624 INFO L130 BoogieDeclarations]: Found specification of procedure fail [2021-11-02 22:30:23,628 INFO L130 BoogieDeclarations]: Found specification of procedure alloc_node [2021-11-02 22:30:23,628 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-02 22:30:23,628 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-02 22:30:23,629 INFO L130 BoogieDeclarations]: Found specification of procedure chain_node [2021-11-02 22:30:23,630 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-02 22:30:23,633 INFO L130 BoogieDeclarations]: Found specification of procedure create_sll [2021-11-02 22:30:23,633 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-02 22:30:23,633 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-02 22:30:23,634 INFO L130 BoogieDeclarations]: Found specification of procedure init_back_link [2021-11-02 22:30:23,634 INFO L130 BoogieDeclarations]: Found specification of procedure reverse_dll [2021-11-02 22:30:23,635 INFO L130 BoogieDeclarations]: Found specification of procedure remove_fw_link [2021-11-02 22:30:23,635 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_next [2021-11-02 22:30:23,635 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_prev [2021-11-02 22:30:23,635 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-02 22:30:23,640 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-02 22:30:23,640 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-02 22:30:23,640 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-02 22:30:23,641 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-02 22:30:23,641 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-02 22:30:24,712 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-02 22:30:24,713 INFO L299 CfgBuilder]: Removed 33 assume(true) statements. [2021-11-02 22:30:24,716 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:30:24 BoogieIcfgContainer [2021-11-02 22:30:24,717 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-02 22:30:24,719 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-02 22:30:24,719 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-02 22:30:24,723 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-02 22:30:24,724 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 10:30:22" (1/3) ... [2021-11-02 22:30:24,726 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59d0c130 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:30:24, skipping insertion in model container [2021-11-02 22:30:24,726 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:30:23" (2/3) ... [2021-11-02 22:30:24,727 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59d0c130 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:30:24, skipping insertion in model container [2021-11-02 22:30:24,727 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:30:24" (3/3) ... [2021-11-02 22:30:24,728 INFO L111 eAbstractionObserver]: Analyzing ICFG sll_to_dll_rev-1.i [2021-11-02 22:30:24,736 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-02 22:30:24,737 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 83 error locations. [2021-11-02 22:30:24,842 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-02 22:30:24,857 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 22:30:24,857 INFO L340 AbstractCegarLoop]: Starting to check reachability of 83 error locations. [2021-11-02 22:30:24,895 INFO L276 IsEmpty]: Start isEmpty. Operand has 244 states, 127 states have (on average 2.047244094488189) internal successors, (260), 220 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 22:30:24,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-02 22:30:24,906 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:24,906 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:30:24,907 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 22:30:24,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:24,914 INFO L85 PathProgramCache]: Analyzing trace with hash 576320188, now seen corresponding path program 1 times [2021-11-02 22:30:24,932 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:24,932 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [818007875] [2021-11-02 22:30:24,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:24,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:25,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:25,143 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:25,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:25,161 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 22:30:25,161 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:25,162 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [818007875] [2021-11-02 22:30:25,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [818007875] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:30:25,163 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:30:25,163 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:30:25,165 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673225217] [2021-11-02 22:30:25,170 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-02 22:30:25,170 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:25,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-02 22:30:25,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-02 22:30:25,189 INFO L87 Difference]: Start difference. First operand has 244 states, 127 states have (on average 2.047244094488189) internal successors, (260), 220 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 22:30:25,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:25,595 INFO L93 Difference]: Finished difference Result 242 states and 263 transitions. [2021-11-02 22:30:25,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-02 22:30:25,597 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 22:30:25,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:25,615 INFO L225 Difference]: With dead ends: 242 [2021-11-02 22:30:25,615 INFO L226 Difference]: Without dead ends: 239 [2021-11-02 22:30:25,618 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 22:30:25,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2021-11-02 22:30:25,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 239. [2021-11-02 22:30:25,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 123 states have (on average 1.7967479674796747) internal successors, (221), 213 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 22:30:25,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 260 transitions. [2021-11-02 22:30:25,674 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 260 transitions. Word has length 10 [2021-11-02 22:30:25,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:25,675 INFO L470 AbstractCegarLoop]: Abstraction has 239 states and 260 transitions. [2021-11-02 22:30:25,675 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 22:30:25,675 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 260 transitions. [2021-11-02 22:30:25,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-02 22:30:25,676 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:25,676 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:30:25,676 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-02 22:30:25,676 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 22:30:25,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:25,677 INFO L85 PathProgramCache]: Analyzing trace with hash -891387824, now seen corresponding path program 1 times [2021-11-02 22:30:25,678 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:25,678 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [91403798] [2021-11-02 22:30:25,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:25,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:25,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:25,771 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:25,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:25,789 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 22:30:25,789 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:25,789 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [91403798] [2021-11-02 22:30:25,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [91403798] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:30:25,790 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:30:25,790 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:30:25,790 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362680301] [2021-11-02 22:30:25,791 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:30:25,792 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:25,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:30:25,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:30:25,793 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 22:30:26,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:26,327 INFO L93 Difference]: Finished difference Result 237 states and 258 transitions. [2021-11-02 22:30:26,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:30:26,328 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 22:30:26,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:26,331 INFO L225 Difference]: With dead ends: 237 [2021-11-02 22:30:26,332 INFO L226 Difference]: Without dead ends: 237 [2021-11-02 22:30:26,333 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 22:30:26,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2021-11-02 22:30:26,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 237. [2021-11-02 22:30:26,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 123 states have (on average 1.7804878048780488) internal successors, (219), 211 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 22:30:26,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 258 transitions. [2021-11-02 22:30:26,368 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 258 transitions. Word has length 14 [2021-11-02 22:30:26,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:26,369 INFO L470 AbstractCegarLoop]: Abstraction has 237 states and 258 transitions. [2021-11-02 22:30:26,369 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 22:30:26,369 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 258 transitions. [2021-11-02 22:30:26,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-02 22:30:26,370 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:26,370 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:30:26,370 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-02 22:30:26,371 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 22:30:26,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:26,371 INFO L85 PathProgramCache]: Analyzing trace with hash -891387823, now seen corresponding path program 1 times [2021-11-02 22:30:26,372 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:26,373 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [930290697] [2021-11-02 22:30:26,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:26,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:26,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:26,478 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:26,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:26,489 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 22:30:26,490 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:26,490 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [930290697] [2021-11-02 22:30:26,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [930290697] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:30:26,490 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:30:26,491 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:30:26,491 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680771509] [2021-11-02 22:30:26,491 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:30:26,492 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:26,492 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:30:26,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:30:26,493 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 22:30:26,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:26,935 INFO L93 Difference]: Finished difference Result 235 states and 256 transitions. [2021-11-02 22:30:26,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:30:26,936 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 22:30:26,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:26,938 INFO L225 Difference]: With dead ends: 235 [2021-11-02 22:30:26,938 INFO L226 Difference]: Without dead ends: 235 [2021-11-02 22:30:26,938 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 22:30:26,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2021-11-02 22:30:26,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 235. [2021-11-02 22:30:26,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 123 states have (on average 1.7642276422764227) internal successors, (217), 209 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 22:30:26,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 256 transitions. [2021-11-02 22:30:26,968 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 256 transitions. Word has length 14 [2021-11-02 22:30:26,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:26,968 INFO L470 AbstractCegarLoop]: Abstraction has 235 states and 256 transitions. [2021-11-02 22:30:26,969 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 22:30:26,969 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 256 transitions. [2021-11-02 22:30:26,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-02 22:30:26,970 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:26,970 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 22:30:26,970 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-02 22:30:26,971 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 22:30:26,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:26,974 INFO L85 PathProgramCache]: Analyzing trace with hash 1703543133, now seen corresponding path program 1 times [2021-11-02 22:30:26,974 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:26,975 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1347840053] [2021-11-02 22:30:26,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:26,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:27,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:27,136 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:27,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:27,168 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 22:30:27,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:27,246 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 22:30:27,246 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:27,246 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1347840053] [2021-11-02 22:30:27,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1347840053] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:30:27,247 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:30:27,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:30:27,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369353247] [2021-11-02 22:30:27,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:30:27,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:27,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:30:27,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:30:27,249 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 22:30:28,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:28,377 INFO L93 Difference]: Finished difference Result 265 states and 290 transitions. [2021-11-02 22:30:28,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:30:28,378 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 22:30:28,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:28,382 INFO L225 Difference]: With dead ends: 265 [2021-11-02 22:30:28,382 INFO L226 Difference]: Without dead ends: 265 [2021-11-02 22:30:28,384 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 22:30:28,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2021-11-02 22:30:28,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 230. [2021-11-02 22:30:28,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 123 states have (on average 1.7235772357723578) internal successors, (212), 204 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 22:30:28,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 251 transitions. [2021-11-02 22:30:28,409 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 251 transitions. Word has length 20 [2021-11-02 22:30:28,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:28,410 INFO L470 AbstractCegarLoop]: Abstraction has 230 states and 251 transitions. [2021-11-02 22:30:28,410 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 22:30:28,410 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 251 transitions. [2021-11-02 22:30:28,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-02 22:30:28,411 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:28,411 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 22:30:28,411 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-02 22:30:28,412 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 22:30:28,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:28,412 INFO L85 PathProgramCache]: Analyzing trace with hash 1703543134, now seen corresponding path program 1 times [2021-11-02 22:30:28,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:28,413 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1774704960] [2021-11-02 22:30:28,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:28,414 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:28,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:28,575 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:28,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:28,598 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 22:30:28,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:28,663 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 22:30:28,663 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:28,663 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1774704960] [2021-11-02 22:30:28,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1774704960] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:30:28,663 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:30:28,664 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-02 22:30:28,664 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945176173] [2021-11-02 22:30:28,664 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:30:28,664 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:28,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:30:28,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:30:28,665 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 22:30:29,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:29,913 INFO L93 Difference]: Finished difference Result 276 states and 301 transitions. [2021-11-02 22:30:29,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:30:29,914 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 22:30:29,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:29,916 INFO L225 Difference]: With dead ends: 276 [2021-11-02 22:30:29,916 INFO L226 Difference]: Without dead ends: 276 [2021-11-02 22:30:29,917 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2021-11-02 22:30:29,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2021-11-02 22:30:29,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 240. [2021-11-02 22:30:29,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 240 states, 130 states have (on average 1.7) internal successors, (221), 212 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 22:30:29,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 264 transitions. [2021-11-02 22:30:29,928 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 264 transitions. Word has length 20 [2021-11-02 22:30:29,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:29,929 INFO L470 AbstractCegarLoop]: Abstraction has 240 states and 264 transitions. [2021-11-02 22:30:29,929 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 22:30:29,929 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 264 transitions. [2021-11-02 22:30:29,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-02 22:30:29,930 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:29,930 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 22:30:29,930 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-02 22:30:29,931 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 22:30:29,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:29,931 INFO L85 PathProgramCache]: Analyzing trace with hash 1270229956, now seen corresponding path program 1 times [2021-11-02 22:30:29,931 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:29,932 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [787694099] [2021-11-02 22:30:29,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:29,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:29,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:30,007 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:30,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:30,031 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 22:30:30,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:30,071 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 22:30:30,072 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:30,072 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [787694099] [2021-11-02 22:30:30,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [787694099] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:30:30,072 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:30:30,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:30:30,073 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14954011] [2021-11-02 22:30:30,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:30:30,074 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:30,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:30:30,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:30:30,075 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 22:30:30,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:30,875 INFO L93 Difference]: Finished difference Result 273 states and 299 transitions. [2021-11-02 22:30:30,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:30:30,875 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 22:30:30,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:30,878 INFO L225 Difference]: With dead ends: 273 [2021-11-02 22:30:30,878 INFO L226 Difference]: Without dead ends: 273 [2021-11-02 22:30:30,879 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 22:30:30,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2021-11-02 22:30:30,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 239. [2021-11-02 22:30:30,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 130 states have (on average 1.6846153846153846) internal successors, (219), 211 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 22:30:30,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 262 transitions. [2021-11-02 22:30:30,890 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 262 transitions. Word has length 21 [2021-11-02 22:30:30,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:30,890 INFO L470 AbstractCegarLoop]: Abstraction has 239 states and 262 transitions. [2021-11-02 22:30:30,891 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 22:30:30,891 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 262 transitions. [2021-11-02 22:30:30,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-02 22:30:30,892 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:30,892 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 22:30:30,893 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-02 22:30:30,893 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 22:30:30,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:30,893 INFO L85 PathProgramCache]: Analyzing trace with hash 1270229957, now seen corresponding path program 1 times [2021-11-02 22:30:30,893 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:30,900 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993994154] [2021-11-02 22:30:30,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:30,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:30,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:31,002 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:31,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:31,033 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 22:30:31,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:31,081 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 22:30:31,081 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:31,082 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993994154] [2021-11-02 22:30:31,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [993994154] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:30:31,082 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:30:31,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:30:31,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312677359] [2021-11-02 22:30:31,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:30:31,083 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:31,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:30:31,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:30:31,084 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 22:30:31,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:31,947 INFO L93 Difference]: Finished difference Result 272 states and 297 transitions. [2021-11-02 22:30:31,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:30:31,948 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 22:30:31,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:31,950 INFO L225 Difference]: With dead ends: 272 [2021-11-02 22:30:31,950 INFO L226 Difference]: Without dead ends: 272 [2021-11-02 22:30:31,950 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 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 22:30:31,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2021-11-02 22:30:31,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 238. [2021-11-02 22:30:31,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 130 states have (on average 1.6692307692307693) internal successors, (217), 210 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 22:30:31,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 260 transitions. [2021-11-02 22:30:31,961 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 260 transitions. Word has length 21 [2021-11-02 22:30:31,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:31,961 INFO L470 AbstractCegarLoop]: Abstraction has 238 states and 260 transitions. [2021-11-02 22:30:31,961 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 22:30:31,961 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 260 transitions. [2021-11-02 22:30:31,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-02 22:30:31,962 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:31,963 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 22:30:31,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-02 22:30:31,963 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 22:30:31,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:31,963 INFO L85 PathProgramCache]: Analyzing trace with hash 1907624827, now seen corresponding path program 1 times [2021-11-02 22:30:31,963 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:31,964 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [596470592] [2021-11-02 22:30:31,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:31,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:31,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:32,025 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:32,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:32,040 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-02 22:30:32,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:32,085 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:30:32,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:32,094 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 22:30:32,094 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:32,094 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [596470592] [2021-11-02 22:30:32,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [596470592] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:30:32,095 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:30:32,095 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:30:32,095 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751384037] [2021-11-02 22:30:32,096 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:30:32,096 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:32,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:30:32,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:30:32,097 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 22:30:32,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:32,887 INFO L93 Difference]: Finished difference Result 269 states and 294 transitions. [2021-11-02 22:30:32,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:30:32,887 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 22:30:32,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:32,890 INFO L225 Difference]: With dead ends: 269 [2021-11-02 22:30:32,890 INFO L226 Difference]: Without dead ends: 269 [2021-11-02 22:30:32,890 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 22:30:32,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2021-11-02 22:30:32,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 235. [2021-11-02 22:30:32,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 130 states have (on average 1.646153846153846) internal successors, (214), 207 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 22:30:32,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 257 transitions. [2021-11-02 22:30:32,900 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 257 transitions. Word has length 28 [2021-11-02 22:30:32,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:32,901 INFO L470 AbstractCegarLoop]: Abstraction has 235 states and 257 transitions. [2021-11-02 22:30:32,901 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 22:30:32,901 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 257 transitions. [2021-11-02 22:30:32,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-02 22:30:32,902 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:32,902 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 22:30:32,903 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-02 22:30:32,903 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 22:30:32,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:32,903 INFO L85 PathProgramCache]: Analyzing trace with hash -993172203, now seen corresponding path program 1 times [2021-11-02 22:30:32,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:32,904 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812412644] [2021-11-02 22:30:32,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:32,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:32,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:32,993 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:32,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:33,010 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-02 22:30:33,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:33,059 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:30:33,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:33,144 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 22:30:33,144 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:33,144 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812412644] [2021-11-02 22:30:33,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812412644] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:30:33,145 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:30:33,145 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 22:30:33,145 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69191266] [2021-11-02 22:30:33,145 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:30:33,145 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:33,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:30:33,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:30:33,146 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 22:30:34,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:34,031 INFO L93 Difference]: Finished difference Result 274 states and 300 transitions. [2021-11-02 22:30:34,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:30:34,032 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 22:30:34,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:34,034 INFO L225 Difference]: With dead ends: 274 [2021-11-02 22:30:34,034 INFO L226 Difference]: Without dead ends: 274 [2021-11-02 22:30:34,035 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2021-11-02 22:30:34,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2021-11-02 22:30:34,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 228. [2021-11-02 22:30:34,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 130 states have (on average 1.5923076923076922) internal successors, (207), 200 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 22:30:34,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 250 transitions. [2021-11-02 22:30:34,044 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 250 transitions. Word has length 29 [2021-11-02 22:30:34,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:34,045 INFO L470 AbstractCegarLoop]: Abstraction has 228 states and 250 transitions. [2021-11-02 22:30:34,045 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 22:30:34,045 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 250 transitions. [2021-11-02 22:30:34,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-02 22:30:34,046 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:34,047 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 22:30:34,047 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-02 22:30:34,047 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 22:30:34,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:34,048 INFO L85 PathProgramCache]: Analyzing trace with hash -993172202, now seen corresponding path program 1 times [2021-11-02 22:30:34,048 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:34,048 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1498541047] [2021-11-02 22:30:34,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:34,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:34,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:34,165 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:34,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:34,185 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-02 22:30:34,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:34,241 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:30:34,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:34,320 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 22:30:34,320 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:34,320 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1498541047] [2021-11-02 22:30:34,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1498541047] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:30:34,321 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:30:34,321 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 22:30:34,321 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288528904] [2021-11-02 22:30:34,321 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:30:34,322 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:34,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:30:34,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:30:34,323 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 22:30:35,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:35,329 INFO L93 Difference]: Finished difference Result 261 states and 286 transitions. [2021-11-02 22:30:35,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:30:35,329 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 22:30:35,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:35,332 INFO L225 Difference]: With dead ends: 261 [2021-11-02 22:30:35,332 INFO L226 Difference]: Without dead ends: 261 [2021-11-02 22:30:35,332 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:30:35,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-11-02 22:30:35,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 227. [2021-11-02 22:30:35,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 130 states have (on average 1.5846153846153845) internal successors, (206), 199 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 22:30:35,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 249 transitions. [2021-11-02 22:30:35,347 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 249 transitions. Word has length 29 [2021-11-02 22:30:35,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:35,350 INFO L470 AbstractCegarLoop]: Abstraction has 227 states and 249 transitions. [2021-11-02 22:30:35,350 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 22:30:35,350 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 249 transitions. [2021-11-02 22:30:35,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-02 22:30:35,356 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:35,356 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, 1, 1, 1, 1, 1] [2021-11-02 22:30:35,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-02 22:30:35,357 INFO L402 AbstractCegarLoop]: === Iteration 11 === 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 22:30:35,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:35,357 INFO L85 PathProgramCache]: Analyzing trace with hash -1009012061, now seen corresponding path program 1 times [2021-11-02 22:30:35,358 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:35,359 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [548705009] [2021-11-02 22:30:35,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:35,360 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:35,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:35,575 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:35,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:35,602 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-02 22:30:35,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:35,677 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:30:35,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:35,779 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 22:30:35,779 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:35,780 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [548705009] [2021-11-02 22:30:35,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [548705009] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:30:35,780 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:30:35,780 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-11-02 22:30:35,780 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29870182] [2021-11-02 22:30:35,781 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-02 22:30:35,781 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:35,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-02 22:30:35,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:30:35,782 INFO L87 Difference]: Start difference. First operand 227 states and 249 transitions. Second operand has 14 states, 10 states have (on average 2.6) internal successors, (26), 11 states have internal predecessors, (26), 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 22:30:36,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:36,880 INFO L93 Difference]: Finished difference Result 260 states and 285 transitions. [2021-11-02 22:30:36,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:30:36,881 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 10 states have (on average 2.6) internal successors, (26), 11 states have internal predecessors, (26), 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 34 [2021-11-02 22:30:36,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:36,883 INFO L225 Difference]: With dead ends: 260 [2021-11-02 22:30:36,883 INFO L226 Difference]: Without dead ends: 260 [2021-11-02 22:30:36,883 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:30:36,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-11-02 22:30:36,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 226. [2021-11-02 22:30:36,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 130 states have (on average 1.5769230769230769) internal successors, (205), 198 states have internal predecessors, (205), 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 22:30:36,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 248 transitions. [2021-11-02 22:30:36,898 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 248 transitions. Word has length 34 [2021-11-02 22:30:36,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:36,899 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 248 transitions. [2021-11-02 22:30:36,899 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 10 states have (on average 2.6) internal successors, (26), 11 states have internal predecessors, (26), 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 22:30:36,899 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 248 transitions. [2021-11-02 22:30:36,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-02 22:30:36,904 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:36,905 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, 1, 1, 1, 1, 1] [2021-11-02 22:30:36,905 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-02 22:30:36,905 INFO L402 AbstractCegarLoop]: === Iteration 12 === 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 22:30:36,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:36,906 INFO L85 PathProgramCache]: Analyzing trace with hash -1009012060, now seen corresponding path program 1 times [2021-11-02 22:30:36,906 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:36,906 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1792731526] [2021-11-02 22:30:36,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:36,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:36,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:37,060 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:37,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:37,084 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-02 22:30:37,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:37,138 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:30:37,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:37,220 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 22:30:37,220 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:37,220 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1792731526] [2021-11-02 22:30:37,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1792731526] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:30:37,223 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:30:37,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 22:30:37,224 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53071256] [2021-11-02 22:30:37,225 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:30:37,225 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:37,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:30:37,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:30:37,227 INFO L87 Difference]: Start difference. First operand 226 states and 248 transitions. Second operand has 12 states, 8 states have (on average 3.25) internal successors, (26), 9 states have internal predecessors, (26), 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 22:30:38,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:38,089 INFO L93 Difference]: Finished difference Result 252 states and 277 transitions. [2021-11-02 22:30:38,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:30:38,090 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 8 states have (on average 3.25) internal successors, (26), 9 states have internal predecessors, (26), 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 34 [2021-11-02 22:30:38,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:38,092 INFO L225 Difference]: With dead ends: 252 [2021-11-02 22:30:38,092 INFO L226 Difference]: Without dead ends: 252 [2021-11-02 22:30:38,092 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:30:38,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-11-02 22:30:38,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 218. [2021-11-02 22:30:38,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 130 states have (on average 1.5153846153846153) internal successors, (197), 190 states have internal predecessors, (197), 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 22:30:38,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 240 transitions. [2021-11-02 22:30:38,101 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 240 transitions. Word has length 34 [2021-11-02 22:30:38,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:38,101 INFO L470 AbstractCegarLoop]: Abstraction has 218 states and 240 transitions. [2021-11-02 22:30:38,101 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 8 states have (on average 3.25) internal successors, (26), 9 states have internal predecessors, (26), 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 22:30:38,102 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 240 transitions. [2021-11-02 22:30:38,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-02 22:30:38,103 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:38,103 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:30:38,103 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-02 22:30:38,103 INFO L402 AbstractCegarLoop]: === Iteration 13 === 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 22:30:38,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:38,104 INFO L85 PathProgramCache]: Analyzing trace with hash 461964964, now seen corresponding path program 1 times [2021-11-02 22:30:38,104 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:38,104 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970545761] [2021-11-02 22:30:38,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:38,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:38,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:38,231 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:38,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:38,251 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-02 22:30:38,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:38,305 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:30:38,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:38,312 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2021-11-02 22:30:38,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:38,377 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 22:30:38,377 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:38,377 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970545761] [2021-11-02 22:30:38,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1970545761] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:38,378 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090807247] [2021-11-02 22:30:38,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:38,378 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:30:38,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:30:38,382 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:30:38,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-02 22:30:38,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:38,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-02 22:30:38,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:30:38,983 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 22:30:39,201 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:30:39,201 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 22:30:39,286 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 22:30:39,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1090807247] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:39,287 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:30:39,287 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10] total 21 [2021-11-02 22:30:39,287 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250111306] [2021-11-02 22:30:39,288 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-02 22:30:39,288 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:39,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-02 22:30:39,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2021-11-02 22:30:39,289 INFO L87 Difference]: Start difference. First operand 218 states and 240 transitions. Second operand has 22 states, 17 states have (on average 3.3529411764705883) internal successors, (57), 17 states have internal predecessors, (57), 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 22:30:41,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:41,088 INFO L93 Difference]: Finished difference Result 250 states and 275 transitions. [2021-11-02 22:30:41,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:30:41,088 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 17 states have (on average 3.3529411764705883) internal successors, (57), 17 states have internal predecessors, (57), 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 44 [2021-11-02 22:30:41,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:41,090 INFO L225 Difference]: With dead ends: 250 [2021-11-02 22:30:41,091 INFO L226 Difference]: Without dead ends: 250 [2021-11-02 22:30:41,091 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=139, Invalid=731, Unknown=0, NotChecked=0, Total=870 [2021-11-02 22:30:41,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2021-11-02 22:30:41,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 216. [2021-11-02 22:30:41,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 130 states have (on average 1.5) internal successors, (195), 188 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 22:30:41,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 238 transitions. [2021-11-02 22:30:41,099 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 238 transitions. Word has length 44 [2021-11-02 22:30:41,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:41,103 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 238 transitions. [2021-11-02 22:30:41,103 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 17 states have (on average 3.3529411764705883) internal successors, (57), 17 states have internal predecessors, (57), 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 22:30:41,103 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 238 transitions. [2021-11-02 22:30:41,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-02 22:30:41,105 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:41,105 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:30:41,134 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-02 22:30:41,324 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-02 22:30:41,324 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 22:30:41,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:41,327 INFO L85 PathProgramCache]: Analyzing trace with hash -675063223, now seen corresponding path program 1 times [2021-11-02 22:30:41,327 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:41,327 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1627961462] [2021-11-02 22:30:41,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:41,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:41,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:41,437 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:41,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:41,455 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:30:41,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:41,625 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:30:41,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:41,664 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:30:41,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:41,670 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-11-02 22:30:41,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:41,731 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:30:41,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:41,825 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-02 22:30:41,825 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:41,826 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1627961462] [2021-11-02 22:30:41,826 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1627961462] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:30:41,826 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:30:41,826 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-02 22:30:41,826 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464715484] [2021-11-02 22:30:41,827 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-02 22:30:41,827 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:41,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-02 22:30:41,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:30:41,828 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, (7), 3 states have call predecessors, (7), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-02 22:30:43,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:43,038 INFO L93 Difference]: Finished difference Result 255 states and 281 transitions. [2021-11-02 22:30:43,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 22:30:43,039 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, (7), 3 states have call predecessors, (7), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 61 [2021-11-02 22:30:43,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:43,041 INFO L225 Difference]: With dead ends: 255 [2021-11-02 22:30:43,041 INFO L226 Difference]: Without dead ends: 255 [2021-11-02 22:30:43,042 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 9 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 22:30:43,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-11-02 22:30:43,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 209. [2021-11-02 22:30:43,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 130 states have (on average 1.4461538461538461) internal successors, (188), 181 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 22:30:43,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 231 transitions. [2021-11-02 22:30:43,052 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 231 transitions. Word has length 61 [2021-11-02 22:30:43,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:43,054 INFO L470 AbstractCegarLoop]: Abstraction has 209 states and 231 transitions. [2021-11-02 22:30:43,054 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, (7), 3 states have call predecessors, (7), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-02 22:30:43,054 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 231 transitions. [2021-11-02 22:30:43,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-02 22:30:43,066 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:43,066 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:30:43,066 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-02 22:30:43,067 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 22:30:43,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:43,067 INFO L85 PathProgramCache]: Analyzing trace with hash 547876632, now seen corresponding path program 1 times [2021-11-02 22:30:43,068 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:43,068 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [242135940] [2021-11-02 22:30:43,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:43,068 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:43,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:43,164 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:43,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:43,186 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:30:43,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:43,279 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:30:43,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:43,289 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:30:43,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:43,295 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-11-02 22:30:43,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:43,358 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:30:43,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:43,448 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-02 22:30:43,449 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:43,451 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [242135940] [2021-11-02 22:30:43,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [242135940] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:30:43,451 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:30:43,452 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-02 22:30:43,454 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333763884] [2021-11-02 22:30:43,455 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-02 22:30:43,455 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:43,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-02 22:30:43,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:30:43,456 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), 5 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-02 22:30:44,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:44,265 INFO L93 Difference]: Finished difference Result 243 states and 271 transitions. [2021-11-02 22:30:44,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:30:44,267 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), 5 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 62 [2021-11-02 22:30:44,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:44,269 INFO L225 Difference]: With dead ends: 243 [2021-11-02 22:30:44,269 INFO L226 Difference]: Without dead ends: 243 [2021-11-02 22:30:44,270 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:30:44,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-11-02 22:30:44,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 202. [2021-11-02 22:30:44,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 130 states have (on average 1.3923076923076922) internal successors, (181), 174 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 22:30:44,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 224 transitions. [2021-11-02 22:30:44,285 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 224 transitions. Word has length 62 [2021-11-02 22:30:44,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:44,285 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 224 transitions. [2021-11-02 22:30:44,286 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), 5 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-02 22:30:44,286 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 224 transitions. [2021-11-02 22:30:44,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-02 22:30:44,287 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:44,287 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:30:44,287 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-02 22:30:44,287 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 22:30:44,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:44,288 INFO L85 PathProgramCache]: Analyzing trace with hash 547876631, now seen corresponding path program 1 times [2021-11-02 22:30:44,288 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:44,288 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962668926] [2021-11-02 22:30:44,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:44,289 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:44,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:44,373 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:44,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:44,388 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:30:44,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:44,510 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:30:44,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:44,521 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:30:44,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:44,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-11-02 22:30:44,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:44,572 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:30:44,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:44,655 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-02 22:30:44,655 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:44,655 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962668926] [2021-11-02 22:30:44,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1962668926] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:30:44,656 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:30:44,656 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 22:30:44,656 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34983384] [2021-11-02 22:30:44,656 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:30:44,657 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:44,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:30:44,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:30:44,658 INFO L87 Difference]: Start difference. First operand 202 states and 224 transitions. Second operand has 12 states, 10 states have (on average 4.9) internal successors, (49), 10 states have internal predecessors, (49), 5 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-02 22:30:45,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:45,651 INFO L93 Difference]: Finished difference Result 247 states and 273 transitions. [2021-11-02 22:30:45,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:30:45,652 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 4.9) internal successors, (49), 10 states have internal predecessors, (49), 5 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 62 [2021-11-02 22:30:45,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:45,654 INFO L225 Difference]: With dead ends: 247 [2021-11-02 22:30:45,654 INFO L226 Difference]: Without dead ends: 247 [2021-11-02 22:30:45,655 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 10 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:30:45,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-11-02 22:30:45,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 201. [2021-11-02 22:30:45,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 130 states have (on average 1.3846153846153846) internal successors, (180), 173 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 22:30:45,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 223 transitions. [2021-11-02 22:30:45,662 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 223 transitions. Word has length 62 [2021-11-02 22:30:45,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:45,663 INFO L470 AbstractCegarLoop]: Abstraction has 201 states and 223 transitions. [2021-11-02 22:30:45,663 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 4.9) internal successors, (49), 10 states have internal predecessors, (49), 5 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-02 22:30:45,663 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 223 transitions. [2021-11-02 22:30:45,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-02 22:30:45,664 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:45,664 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:30:45,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-02 22:30:45,665 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 22:30:45,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:45,665 INFO L85 PathProgramCache]: Analyzing trace with hash 1203680122, now seen corresponding path program 1 times [2021-11-02 22:30:45,665 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:45,666 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2074043827] [2021-11-02 22:30:45,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:45,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:45,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:45,792 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:45,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:45,811 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:30:45,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:46,093 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:30:46,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:46,198 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:30:46,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:46,259 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-11-02 22:30:46,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:46,816 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:30:46,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:47,008 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-02 22:30:47,008 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:47,008 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2074043827] [2021-11-02 22:30:47,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2074043827] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:47,009 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1719008850] [2021-11-02 22:30:47,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:47,009 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:30:47,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:30:47,016 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:30:47,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-02 22:30:47,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:47,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 408 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-02 22:30:47,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:30:47,577 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 22:30:47,751 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-11-02 22:30:47,752 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 20 treesize of output 27 [2021-11-02 22:30:48,025 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-02 22:30:48,025 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 28 treesize of output 23 [2021-11-02 22:30:57,719 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 22:30:57,986 INFO L354 Elim1Store]: treesize reduction 341, result has 27.6 percent of original size [2021-11-02 22:30:57,986 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 70 treesize of output 151 [2021-11-02 22:31:36,694 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 1031 treesize of output 1030 [2021-11-02 22:32:46,636 INFO L354 Elim1Store]: treesize reduction 188, result has 65.1 percent of original size [2021-11-02 22:32:46,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 11 new quantified variables, introduced 45 case distinctions, treesize of input 488 treesize of output 621 [2021-11-02 22:40:00,150 INFO L354 Elim1Store]: treesize reduction 16, result has 36.0 percent of original size [2021-11-02 22:40:00,150 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 24 treesize of output 26 [2021-11-02 22:40:00,167 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2021-11-02 22:40:00,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1719008850] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:40:00,168 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:40:00,168 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 31] total 50 [2021-11-02 22:40:00,168 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612232541] [2021-11-02 22:40:00,169 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-02 22:40:00,169 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:40:00,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-02 22:40:00,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=2219, Unknown=4, NotChecked=94, Total=2450 [2021-11-02 22:40:00,172 INFO L87 Difference]: Start difference. First operand 201 states and 223 transitions. Second operand has 50 states, 43 states have (on average 2.0697674418604652) internal successors, (89), 43 states have internal predecessors, (89), 11 states have call successors, (15), 6 states have call predecessors, (15), 9 states have return successors, (10), 10 states have call predecessors, (10), 9 states have call successors, (10) [2021-11-02 22:40:14,450 WARN L207 SmtUtils]: Spent 5.46 s on a formula simplification. DAG size of input: 47 DAG size of output: 38 [2021-11-02 22:40:44,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:40:44,255 INFO L93 Difference]: Finished difference Result 330 states and 379 transitions. [2021-11-02 22:40:44,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-02 22:40:44,256 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 43 states have (on average 2.0697674418604652) internal successors, (89), 43 states have internal predecessors, (89), 11 states have call successors, (15), 6 states have call predecessors, (15), 9 states have return successors, (10), 10 states have call predecessors, (10), 9 states have call successors, (10) Word has length 67 [2021-11-02 22:40:44,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:40:44,261 INFO L225 Difference]: With dead ends: 330 [2021-11-02 22:40:44,261 INFO L226 Difference]: Without dead ends: 330 [2021-11-02 22:40:44,263 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 55 SyntacticMatches, 4 SemanticMatches, 76 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1136 ImplicationChecksByTransitivity, 36.3s TimeCoverageRelationStatistics Valid=394, Invalid=5451, Unknown=11, NotChecked=150, Total=6006 [2021-11-02 22:40:44,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2021-11-02 22:40:44,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 227. [2021-11-02 22:40:44,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 152 states have (on average 1.381578947368421) internal successors, (210), 196 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 22:40:44,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 258 transitions. [2021-11-02 22:40:44,274 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 258 transitions. Word has length 67 [2021-11-02 22:40:44,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:40:44,274 INFO L470 AbstractCegarLoop]: Abstraction has 227 states and 258 transitions. [2021-11-02 22:40:44,275 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 43 states have (on average 2.0697674418604652) internal successors, (89), 43 states have internal predecessors, (89), 11 states have call successors, (15), 6 states have call predecessors, (15), 9 states have return successors, (10), 10 states have call predecessors, (10), 9 states have call successors, (10) [2021-11-02 22:40:44,275 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 258 transitions. [2021-11-02 22:40:44,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-02 22:40:44,276 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:40:44,276 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:40:44,314 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-02 22:40:44,496 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-02 22:40:44,497 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 22:40:44,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:40:44,497 INFO L85 PathProgramCache]: Analyzing trace with hash 1390616004, now seen corresponding path program 1 times [2021-11-02 22:40:44,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:40:44,497 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1226245078] [2021-11-02 22:40:44,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:40:44,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:40:44,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:40:44,640 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:40:44,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:40:44,664 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-02 22:40:44,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:40:44,969 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:40:44,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:40:45,096 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:40:45,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:40:45,164 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-11-02 22:40:45,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:40:45,624 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:40:45,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:40:45,851 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-02 22:40:45,851 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:40:45,851 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1226245078] [2021-11-02 22:40:45,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1226245078] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:40:45,851 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [49325379] [2021-11-02 22:40:45,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:40:45,852 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:40:45,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:40:45,856 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:40:45,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac65d9c0-1ad8-4959-881d-3c8707d9f2b3/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-02 22:40:46,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:40:46,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 410 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-02 22:40:46,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:40:46,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 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 22:40:46,939 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-02 22:40:46,939 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 22:40:47,149 INFO L354 Elim1Store]: treesize reduction 60, result has 20.0 percent of original size [2021-11-02 22:40:47,149 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 3 case distinctions, treesize of input 35 treesize of output 29 [2021-11-02 22:40:47,250 INFO L354 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2021-11-02 22:40:47,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 34 treesize of output 14 [2021-11-02 22:41:01,529 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 22:41:01,809 INFO L354 Elim1Store]: treesize reduction 522, result has 18.8 percent of original size [2021-11-02 22:41:01,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 9 case distinctions, treesize of input 77 treesize of output 141 [2021-11-02 22:41:44,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 730 treesize of output 729