./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 4e77c044 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 661240919dc6588bede452a002e2db53a892483c .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 661240919dc6588bede452a002e2db53a892483c ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Result: UNKNOWN --- Real Ultimate output --- This is Ultimate 0.2.1-dev-4e77c04 [2021-10-13 00:45:15,048 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 00:45:15,052 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 00:45:15,118 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 00:45:15,119 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 00:45:15,123 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 00:45:15,125 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 00:45:15,130 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 00:45:15,133 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 00:45:15,139 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 00:45:15,141 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 00:45:15,143 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 00:45:15,144 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 00:45:15,146 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 00:45:15,149 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 00:45:15,154 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 00:45:15,160 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 00:45:15,161 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 00:45:15,164 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 00:45:15,173 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 00:45:15,176 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 00:45:15,177 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 00:45:15,181 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 00:45:15,182 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 00:45:15,193 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 00:45:15,193 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 00:45:15,194 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 00:45:15,196 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 00:45:15,197 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 00:45:15,199 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 00:45:15,199 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 00:45:15,201 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 00:45:15,203 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 00:45:15,205 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 00:45:15,207 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 00:45:15,207 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 00:45:15,208 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 00:45:15,208 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 00:45:15,209 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 00:45:15,210 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 00:45:15,211 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 00:45:15,212 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-10-13 00:45:15,261 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 00:45:15,262 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 00:45:15,263 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-10-13 00:45:15,263 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-10-13 00:45:15,271 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-13 00:45:15,272 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-13 00:45:15,272 INFO L138 SettingsManager]: * Use SBE=true [2021-10-13 00:45:15,273 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 00:45:15,273 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 00:45:15,273 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-10-13 00:45:15,275 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-13 00:45:15,275 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 00:45:15,275 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 00:45:15,276 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-10-13 00:45:15,276 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-10-13 00:45:15,276 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-10-13 00:45:15,277 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 00:45:15,277 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 00:45:15,277 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 00:45:15,278 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 00:45:15,278 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 00:45:15,278 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-13 00:45:15,279 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 00:45:15,279 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 00:45:15,279 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 00:45:15,280 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 00:45:15,280 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-10-13 00:45:15,280 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-13 00:45:15,281 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 00:45:15,282 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_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 661240919dc6588bede452a002e2db53a892483c [2021-10-13 00:45:15,614 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 00:45:15,640 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 00:45:15,644 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 00:45:15,646 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 00:45:15,647 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 00:45:15,648 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i [2021-10-13 00:45:15,745 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/data/2f11ceaa3/b06a4c6e71b446c38807594195409ffd/FLAGaa5d5211d [2021-10-13 00:45:16,327 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 00:45:16,328 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i [2021-10-13 00:45:16,345 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/data/2f11ceaa3/b06a4c6e71b446c38807594195409ffd/FLAGaa5d5211d [2021-10-13 00:45:16,626 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/data/2f11ceaa3/b06a4c6e71b446c38807594195409ffd [2021-10-13 00:45:16,629 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 00:45:16,634 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-10-13 00:45:16,640 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 00:45:16,640 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 00:45:16,643 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 00:45:16,644 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 12:45:16" (1/1) ... [2021-10-13 00:45:16,646 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@a6c7507 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:45:16, skipping insertion in model container [2021-10-13 00:45:16,648 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 12:45:16" (1/1) ... [2021-10-13 00:45:16,656 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 00:45:16,727 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 00:45:17,063 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i[24038,24051] [2021-10-13 00:45:17,065 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 00:45:17,075 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 00:45:17,122 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_27d4e2d4-89ac-48c6-a75f-16d7874079ce/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i[24038,24051] [2021-10-13 00:45:17,123 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 00:45:17,158 INFO L208 MainTranslator]: Completed translation [2021-10-13 00:45:17,159 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:45:17 WrapperNode [2021-10-13 00:45:17,159 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 00:45:17,160 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 00:45:17,161 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 00:45:17,161 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 00:45:17,174 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:45:17" (1/1) ... [2021-10-13 00:45:17,174 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:45:17" (1/1) ... [2021-10-13 00:45:17,212 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:45:17" (1/1) ... [2021-10-13 00:45:17,213 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:45:17" (1/1) ... [2021-10-13 00:45:17,251 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:45:17" (1/1) ... [2021-10-13 00:45:17,260 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:45:17" (1/1) ... [2021-10-13 00:45:17,264 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:45:17" (1/1) ... [2021-10-13 00:45:17,271 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 00:45:17,285 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 00:45:17,285 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 00:45:17,285 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 00:45:17,286 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:45:17" (1/1) ... [2021-10-13 00:45:17,295 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 00:45:17,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:45:17,329 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 00:45:17,364 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 00:45:17,387 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-10-13 00:45:17,387 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 00:45:17,387 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-10-13 00:45:17,388 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-10-13 00:45:17,388 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-10-13 00:45:17,389 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2021-10-13 00:45:17,389 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-10-13 00:45:17,390 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_create [2021-10-13 00:45:17,390 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_remove_last [2021-10-13 00:45:17,391 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-10-13 00:45:17,391 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-10-13 00:45:17,392 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-10-13 00:45:17,392 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-10-13 00:45:17,392 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-10-13 00:45:17,392 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-10-13 00:45:17,392 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 00:45:17,393 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-10-13 00:45:17,393 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-10-13 00:45:17,393 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-10-13 00:45:17,393 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-10-13 00:45:17,393 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-10-13 00:45:17,394 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-10-13 00:45:17,394 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-10-13 00:45:17,394 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-10-13 00:45:17,394 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-10-13 00:45:17,395 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-10-13 00:45:17,395 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-10-13 00:45:17,395 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-10-13 00:45:17,395 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-10-13 00:45:17,395 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-10-13 00:45:17,396 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-10-13 00:45:17,396 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-10-13 00:45:17,396 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-10-13 00:45:17,396 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-10-13 00:45:17,396 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-10-13 00:45:17,397 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-10-13 00:45:17,397 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-10-13 00:45:17,397 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-10-13 00:45:17,397 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-10-13 00:45:17,397 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-10-13 00:45:17,398 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-10-13 00:45:17,398 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-10-13 00:45:17,398 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-10-13 00:45:17,398 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-10-13 00:45:17,398 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-10-13 00:45:17,399 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-10-13 00:45:17,399 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-10-13 00:45:17,399 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-10-13 00:45:17,400 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-10-13 00:45:17,401 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-10-13 00:45:17,401 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-10-13 00:45:17,401 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-10-13 00:45:17,401 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-10-13 00:45:17,402 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-10-13 00:45:17,402 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-10-13 00:45:17,402 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-10-13 00:45:17,403 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-10-13 00:45:17,403 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-10-13 00:45:17,403 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-10-13 00:45:17,403 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-10-13 00:45:17,403 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-10-13 00:45:17,404 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-10-13 00:45:17,404 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-10-13 00:45:17,404 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-10-13 00:45:17,405 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-10-13 00:45:17,405 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-10-13 00:45:17,406 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-10-13 00:45:17,406 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-10-13 00:45:17,407 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-10-13 00:45:17,408 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-10-13 00:45:17,408 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-10-13 00:45:17,408 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-10-13 00:45:17,408 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2021-10-13 00:45:17,408 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-10-13 00:45:17,409 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-10-13 00:45:17,409 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-10-13 00:45:17,409 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-10-13 00:45:17,409 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-10-13 00:45:17,409 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-10-13 00:45:17,409 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-10-13 00:45:17,410 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-10-13 00:45:17,410 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-10-13 00:45:17,410 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-10-13 00:45:17,410 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-10-13 00:45:17,411 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-10-13 00:45:17,412 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-10-13 00:45:17,412 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-10-13 00:45:17,412 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-10-13 00:45:17,412 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-10-13 00:45:17,412 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-10-13 00:45:17,412 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-10-13 00:45:17,413 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-10-13 00:45:17,413 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-10-13 00:45:17,413 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-10-13 00:45:17,413 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-10-13 00:45:17,413 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-10-13 00:45:17,414 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-10-13 00:45:17,414 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-10-13 00:45:17,414 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-10-13 00:45:17,414 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-10-13 00:45:17,414 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-10-13 00:45:17,415 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-10-13 00:45:17,415 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-10-13 00:45:17,415 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-10-13 00:45:17,415 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-10-13 00:45:17,416 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-10-13 00:45:17,416 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-10-13 00:45:17,417 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-10-13 00:45:17,417 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-10-13 00:45:17,418 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-10-13 00:45:17,418 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-10-13 00:45:17,418 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-10-13 00:45:17,418 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-10-13 00:45:17,418 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-10-13 00:45:17,419 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-10-13 00:45:17,419 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-10-13 00:45:17,419 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-10-13 00:45:17,419 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-10-13 00:45:17,419 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-10-13 00:45:17,420 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-10-13 00:45:17,420 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2021-10-13 00:45:17,420 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-10-13 00:45:17,420 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-10-13 00:45:17,421 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-10-13 00:45:17,421 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-10-13 00:45:17,421 INFO L130 BoogieDeclarations]: Found specification of procedure sll_create [2021-10-13 00:45:17,422 INFO L130 BoogieDeclarations]: Found specification of procedure sll_remove_last [2021-10-13 00:45:17,423 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-10-13 00:45:17,425 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-13 00:45:17,426 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-10-13 00:45:17,426 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-10-13 00:45:17,427 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-10-13 00:45:17,428 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-13 00:45:17,429 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 00:45:17,429 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-10-13 00:45:17,800 INFO L758 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2021-10-13 00:45:18,091 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 00:45:18,092 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-10-13 00:45:18,094 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 12:45:18 BoogieIcfgContainer [2021-10-13 00:45:18,094 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 00:45:18,100 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 00:45:18,100 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 00:45:18,104 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 00:45:18,105 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 12:45:16" (1/3) ... [2021-10-13 00:45:18,106 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40794470 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 12:45:18, skipping insertion in model container [2021-10-13 00:45:18,106 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:45:17" (2/3) ... [2021-10-13 00:45:18,106 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40794470 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 12:45:18, skipping insertion in model container [2021-10-13 00:45:18,106 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 12:45:18" (3/3) ... [2021-10-13 00:45:18,108 INFO L111 eAbstractionObserver]: Analyzing ICFG sll2n_remove_all_reverse.i [2021-10-13 00:45:18,114 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 00:45:18,116 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 32 error locations. [2021-10-13 00:45:18,179 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 00:45:18,187 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, mConcurrency=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 [2021-10-13 00:45:18,187 INFO L340 AbstractCegarLoop]: Starting to check reachability of 32 error locations. [2021-10-13 00:45:18,205 INFO L276 IsEmpty]: Start isEmpty. Operand has 91 states, 47 states have (on average 1.872340425531915) internal successors, (88), 79 states have internal predecessors, (88), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:45:18,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-10-13 00:45:18,213 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:18,214 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:45:18,214 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:18,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:18,220 INFO L82 PathProgramCache]: Analyzing trace with hash 67921496, now seen corresponding path program 1 times [2021-10-13 00:45:18,230 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:18,231 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918323121] [2021-10-13 00:45:18,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:18,232 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:18,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:18,533 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:18,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:18,575 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:45:18,575 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:18,576 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918323121] [2021-10-13 00:45:18,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [918323121] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:45:18,577 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:45:18,577 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-13 00:45:18,587 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425094936] [2021-10-13 00:45:18,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 00:45:18,596 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:18,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 00:45:18,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 00:45:18,622 INFO L87 Difference]: Start difference. First operand has 91 states, 47 states have (on average 1.872340425531915) internal successors, (88), 79 states have internal predecessors, (88), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:45:19,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:19,016 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2021-10-13 00:45:19,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 00:45:19,018 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-10-13 00:45:19,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:19,033 INFO L225 Difference]: With dead ends: 94 [2021-10-13 00:45:19,034 INFO L226 Difference]: Without dead ends: 88 [2021-10-13 00:45:19,037 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.6ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 00:45:19,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-10-13 00:45:19,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 83. [2021-10-13 00:45:19,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 44 states have (on average 1.75) internal successors, (77), 73 states have internal predecessors, (77), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-13 00:45:19,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2021-10-13 00:45:19,096 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 13 [2021-10-13 00:45:19,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:19,096 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2021-10-13 00:45:19,096 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:45:19,097 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2021-10-13 00:45:19,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-10-13 00:45:19,097 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:19,098 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:45:19,098 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-13 00:45:19,099 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:19,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:19,099 INFO L82 PathProgramCache]: Analyzing trace with hash 67921497, now seen corresponding path program 1 times [2021-10-13 00:45:19,100 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:19,100 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [342366759] [2021-10-13 00:45:19,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:19,100 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:19,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:19,244 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:19,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:19,256 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:45:19,257 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:19,257 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [342366759] [2021-10-13 00:45:19,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [342366759] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:45:19,258 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:45:19,258 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-13 00:45:19,258 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278719419] [2021-10-13 00:45:19,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 00:45:19,260 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:19,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 00:45:19,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 00:45:19,262 INFO L87 Difference]: Start difference. First operand 83 states and 86 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:45:19,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:19,483 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2021-10-13 00:45:19,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 00:45:19,484 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-10-13 00:45:19,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:19,488 INFO L225 Difference]: With dead ends: 86 [2021-10-13 00:45:19,488 INFO L226 Difference]: Without dead ends: 86 [2021-10-13 00:45:19,489 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 24.4ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 00:45:19,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-10-13 00:45:19,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 81. [2021-10-13 00:45:19,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 71 states have internal predecessors, (75), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-13 00:45:19,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2021-10-13 00:45:19,517 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 13 [2021-10-13 00:45:19,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:19,517 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2021-10-13 00:45:19,518 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:45:19,518 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2021-10-13 00:45:19,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-10-13 00:45:19,519 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:19,519 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:45:19,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-13 00:45:19,519 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:19,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:19,520 INFO L82 PathProgramCache]: Analyzing trace with hash 163879501, now seen corresponding path program 1 times [2021-10-13 00:45:19,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:19,521 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [937407759] [2021-10-13 00:45:19,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:19,521 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:19,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:19,638 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:19,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:19,673 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:19,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:19,731 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:45:19,732 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:19,732 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [937407759] [2021-10-13 00:45:19,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [937407759] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:45:19,733 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:45:19,733 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-10-13 00:45:19,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589403612] [2021-10-13 00:45:19,734 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-13 00:45:19,734 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:19,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-13 00:45:19,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-10-13 00:45:19,735 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 00:45:20,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:20,121 INFO L93 Difference]: Finished difference Result 92 states and 96 transitions. [2021-10-13 00:45:20,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 00:45:20,122 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 15 [2021-10-13 00:45:20,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:20,123 INFO L225 Difference]: With dead ends: 92 [2021-10-13 00:45:20,123 INFO L226 Difference]: Without dead ends: 89 [2021-10-13 00:45:20,124 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 151.6ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-10-13 00:45:20,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-10-13 00:45:20,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 82. [2021-10-13 00:45:20,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 45 states have (on average 1.6888888888888889) internal successors, (76), 72 states have internal predecessors, (76), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-13 00:45:20,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 85 transitions. [2021-10-13 00:45:20,132 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 85 transitions. Word has length 15 [2021-10-13 00:45:20,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:20,133 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 85 transitions. [2021-10-13 00:45:20,133 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 00:45:20,133 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 85 transitions. [2021-10-13 00:45:20,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-10-13 00:45:20,134 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:20,134 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:45:20,134 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-10-13 00:45:20,135 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting sll_createErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:20,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:20,136 INFO L82 PathProgramCache]: Analyzing trace with hash -739000516, now seen corresponding path program 1 times [2021-10-13 00:45:20,136 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:20,136 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [353791924] [2021-10-13 00:45:20,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:20,137 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:20,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:20,241 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:20,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:20,262 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-10-13 00:45:20,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:20,295 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:45:20,296 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:20,296 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [353791924] [2021-10-13 00:45:20,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [353791924] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:45:20,297 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:45:20,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-10-13 00:45:20,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054409637] [2021-10-13 00:45:20,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 00:45:20,298 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:20,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 00:45:20,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-10-13 00:45:20,299 INFO L87 Difference]: Start difference. First operand 82 states and 85 transitions. Second operand has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:45:20,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:20,615 INFO L93 Difference]: Finished difference Result 82 states and 86 transitions. [2021-10-13 00:45:20,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 00:45:20,616 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2021-10-13 00:45:20,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:20,617 INFO L225 Difference]: With dead ends: 82 [2021-10-13 00:45:20,617 INFO L226 Difference]: Without dead ends: 82 [2021-10-13 00:45:20,618 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 81.2ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-10-13 00:45:20,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-10-13 00:45:20,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2021-10-13 00:45:20,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 45 states have (on average 1.6666666666666667) internal successors, (75), 71 states have internal predecessors, (75), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-13 00:45:20,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2021-10-13 00:45:20,625 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 19 [2021-10-13 00:45:20,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:20,626 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2021-10-13 00:45:20,626 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:45:20,626 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2021-10-13 00:45:20,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-10-13 00:45:20,627 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:20,627 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:45:20,628 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-10-13 00:45:20,628 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting sll_createErr1REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:20,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:20,629 INFO L82 PathProgramCache]: Analyzing trace with hash -739000515, now seen corresponding path program 1 times [2021-10-13 00:45:20,629 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:20,630 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1221552437] [2021-10-13 00:45:20,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:20,630 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:20,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:20,722 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:20,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:20,740 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-10-13 00:45:20,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:20,786 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:45:20,786 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:20,787 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1221552437] [2021-10-13 00:45:20,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1221552437] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:45:20,787 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:45:20,787 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-10-13 00:45:20,788 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1066705646] [2021-10-13 00:45:20,788 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 00:45:20,789 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:20,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 00:45:20,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-10-13 00:45:20,790 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:45:21,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:21,112 INFO L93 Difference]: Finished difference Result 81 states and 85 transitions. [2021-10-13 00:45:21,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 00:45:21,113 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2021-10-13 00:45:21,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:21,114 INFO L225 Difference]: With dead ends: 81 [2021-10-13 00:45:21,114 INFO L226 Difference]: Without dead ends: 81 [2021-10-13 00:45:21,114 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 107.7ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-10-13 00:45:21,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-10-13 00:45:21,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2021-10-13 00:45:21,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 45 states have (on average 1.6444444444444444) internal successors, (74), 70 states have internal predecessors, (74), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-13 00:45:21,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 83 transitions. [2021-10-13 00:45:21,120 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 83 transitions. Word has length 19 [2021-10-13 00:45:21,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:21,121 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 83 transitions. [2021-10-13 00:45:21,121 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:45:21,121 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 83 transitions. [2021-10-13 00:45:21,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-10-13 00:45:21,122 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:21,123 INFO L512 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] [2021-10-13 00:45:21,123 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-10-13 00:45:21,123 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:21,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:21,124 INFO L82 PathProgramCache]: Analyzing trace with hash -942427069, now seen corresponding path program 1 times [2021-10-13 00:45:21,124 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:21,124 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [482930428] [2021-10-13 00:45:21,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:21,125 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:21,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:21,173 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:21,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:21,199 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:21,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:21,244 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:21,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:21,261 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:45:21,261 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:21,262 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [482930428] [2021-10-13 00:45:21,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [482930428] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:21,263 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [624270244] [2021-10-13 00:45:21,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:21,263 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:21,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:45:21,273 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:45:21,278 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-13 00:45:21,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:21,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-13 00:45:21,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:45:21,642 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:45:21,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [624270244] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:21,642 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:45:21,642 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 10 [2021-10-13 00:45:21,643 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193571239] [2021-10-13 00:45:21,643 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-13 00:45:21,644 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:21,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-13 00:45:21,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-10-13 00:45:21,645 INFO L87 Difference]: Start difference. First operand 80 states and 83 transitions. Second operand has 10 states, 8 states have (on average 3.75) internal successors, (30), 8 states have internal predecessors, (30), 5 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:45:21,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:21,967 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2021-10-13 00:45:21,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-13 00:45:21,968 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 3.75) internal successors, (30), 8 states have internal predecessors, (30), 5 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) Word has length 28 [2021-10-13 00:45:21,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:21,969 INFO L225 Difference]: With dead ends: 94 [2021-10-13 00:45:21,969 INFO L226 Difference]: Without dead ends: 91 [2021-10-13 00:45:21,970 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 123.0ms TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-10-13 00:45:21,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-10-13 00:45:21,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 86. [2021-10-13 00:45:21,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 50 states have (on average 1.58) internal successors, (79), 75 states have internal predecessors, (79), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:45:21,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 90 transitions. [2021-10-13 00:45:21,986 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 90 transitions. Word has length 28 [2021-10-13 00:45:21,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:21,987 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 90 transitions. [2021-10-13 00:45:21,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 3.75) internal successors, (30), 8 states have internal predecessors, (30), 5 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:45:21,991 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 90 transitions. [2021-10-13 00:45:21,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-10-13 00:45:21,993 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:21,994 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:45:22,028 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-13 00:45:22,208 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:22,208 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:22,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:22,209 INFO L82 PathProgramCache]: Analyzing trace with hash 1307900429, now seen corresponding path program 2 times [2021-10-13 00:45:22,209 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:22,209 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [491008028] [2021-10-13 00:45:22,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:22,210 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:22,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:22,313 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:22,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:22,337 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:22,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:22,384 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:22,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:22,394 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:22,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:22,404 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-13 00:45:22,405 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:22,405 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [491008028] [2021-10-13 00:45:22,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [491008028] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:45:22,405 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:45:22,406 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-10-13 00:45:22,406 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833572636] [2021-10-13 00:45:22,407 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 00:45:22,407 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:22,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 00:45:22,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-10-13 00:45:22,409 INFO L87 Difference]: Start difference. First operand 86 states and 90 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:45:22,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:22,649 INFO L93 Difference]: Finished difference Result 89 states and 94 transitions. [2021-10-13 00:45:22,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-13 00:45:22,650 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2021-10-13 00:45:22,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:22,651 INFO L225 Difference]: With dead ends: 89 [2021-10-13 00:45:22,651 INFO L226 Difference]: Without dead ends: 89 [2021-10-13 00:45:22,652 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 72.2ms TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-10-13 00:45:22,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-10-13 00:45:22,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2021-10-13 00:45:22,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 51 states have (on average 1.5686274509803921) internal successors, (80), 76 states have internal predecessors, (80), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:45:22,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 91 transitions. [2021-10-13 00:45:22,670 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 91 transitions. Word has length 41 [2021-10-13 00:45:22,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:22,673 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 91 transitions. [2021-10-13 00:45:22,674 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:45:22,674 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 91 transitions. [2021-10-13 00:45:22,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-10-13 00:45:22,680 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:22,681 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:45:22,681 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-10-13 00:45:22,681 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting sll_remove_lastErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:22,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:22,682 INFO L82 PathProgramCache]: Analyzing trace with hash -1532966339, now seen corresponding path program 1 times [2021-10-13 00:45:22,682 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:22,683 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603171953] [2021-10-13 00:45:22,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:22,683 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:22,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:22,809 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:22,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:22,837 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:22,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:23,079 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:23,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:23,225 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:23,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:23,401 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 00:45:23,401 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:23,402 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603171953] [2021-10-13 00:45:23,402 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1603171953] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:23,402 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [374749367] [2021-10-13 00:45:23,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:23,403 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:23,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:45:23,405 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:45:23,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-10-13 00:45:23,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:23,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 24 conjunts are in the unsatisfiable core [2021-10-13 00:45:23,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:45:23,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:45:24,202 INFO L354 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2021-10-13 00:45:24,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 19 [2021-10-13 00:45:24,235 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:45:24,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [374749367] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:24,237 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:45:24,237 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-10-13 00:45:24,238 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397581382] [2021-10-13 00:45:24,240 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-10-13 00:45:24,244 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:24,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-10-13 00:45:24,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2021-10-13 00:45:24,246 INFO L87 Difference]: Start difference. First operand 87 states and 91 transitions. Second operand has 18 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 14 states have internal predecessors, (53), 5 states have call successors, (10), 5 states have call predecessors, (10), 6 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 00:45:25,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:25,445 INFO L93 Difference]: Finished difference Result 136 states and 147 transitions. [2021-10-13 00:45:25,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-10-13 00:45:25,446 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 14 states have internal predecessors, (53), 5 states have call successors, (10), 5 states have call predecessors, (10), 6 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) Word has length 43 [2021-10-13 00:45:25,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:25,448 INFO L225 Difference]: With dead ends: 136 [2021-10-13 00:45:25,448 INFO L226 Difference]: Without dead ends: 136 [2021-10-13 00:45:25,449 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 801.1ms TimeCoverageRelationStatistics Valid=178, Invalid=634, Unknown=0, NotChecked=0, Total=812 [2021-10-13 00:45:25,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-10-13 00:45:25,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 99. [2021-10-13 00:45:25,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 62 states have (on average 1.467741935483871) internal successors, (91), 85 states have internal predecessors, (91), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-10-13 00:45:25,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 107 transitions. [2021-10-13 00:45:25,455 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 107 transitions. Word has length 43 [2021-10-13 00:45:25,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:25,456 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 107 transitions. [2021-10-13 00:45:25,456 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 14 states have internal predecessors, (53), 5 states have call successors, (10), 5 states have call predecessors, (10), 6 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 00:45:25,456 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 107 transitions. [2021-10-13 00:45:25,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-10-13 00:45:25,458 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:25,458 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:45:25,502 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-10-13 00:45:25,672 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-10-13 00:45:25,672 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting sll_remove_lastErr1REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:25,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:25,673 INFO L82 PathProgramCache]: Analyzing trace with hash -1532966338, now seen corresponding path program 1 times [2021-10-13 00:45:25,673 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:25,673 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731624172] [2021-10-13 00:45:25,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:25,673 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:25,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:25,793 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:25,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:25,815 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:25,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:26,015 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:26,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:26,136 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:26,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:26,287 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 00:45:26,288 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:26,288 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731624172] [2021-10-13 00:45:26,288 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [731624172] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:26,288 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1145125588] [2021-10-13 00:45:26,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:26,289 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:26,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:45:26,290 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:45:26,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-10-13 00:45:26,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:26,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 23 conjunts are in the unsatisfiable core [2021-10-13 00:45:26,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:45:26,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:45:26,543 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 [2021-10-13 00:45:27,232 INFO L354 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2021-10-13 00:45:27,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 29 [2021-10-13 00:45:27,427 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 00:45:27,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1145125588] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:27,428 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:45:27,428 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 18 [2021-10-13 00:45:27,428 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267301295] [2021-10-13 00:45:27,429 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-10-13 00:45:27,429 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:27,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-10-13 00:45:27,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-10-13 00:45:27,431 INFO L87 Difference]: Start difference. First operand 99 states and 107 transitions. Second operand has 19 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 8 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-13 00:45:28,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:28,625 INFO L93 Difference]: Finished difference Result 146 states and 157 transitions. [2021-10-13 00:45:28,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-13 00:45:28,626 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 8 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) Word has length 43 [2021-10-13 00:45:28,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:28,627 INFO L225 Difference]: With dead ends: 146 [2021-10-13 00:45:28,628 INFO L226 Difference]: Without dead ends: 146 [2021-10-13 00:45:28,628 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 639.9ms TimeCoverageRelationStatistics Valid=145, Invalid=557, Unknown=0, NotChecked=0, Total=702 [2021-10-13 00:45:28,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-10-13 00:45:28,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 124. [2021-10-13 00:45:28,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 85 states have (on average 1.5647058823529412) internal successors, (133), 108 states have internal predecessors, (133), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-10-13 00:45:28,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 151 transitions. [2021-10-13 00:45:28,637 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 151 transitions. Word has length 43 [2021-10-13 00:45:28,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:28,637 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 151 transitions. [2021-10-13 00:45:28,638 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 8 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-13 00:45:28,638 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 151 transitions. [2021-10-13 00:45:28,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-10-13 00:45:28,639 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:28,639 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:45:28,682 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-10-13 00:45:28,868 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:28,868 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting sll_remove_lastErr2REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:28,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:28,868 INFO L82 PathProgramCache]: Analyzing trace with hash -277316196, now seen corresponding path program 1 times [2021-10-13 00:45:28,868 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:28,869 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1845029496] [2021-10-13 00:45:28,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:28,869 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:28,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:28,959 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:28,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:28,979 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:28,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:29,053 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:29,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:29,060 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:29,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:29,104 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-13 00:45:29,104 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:29,104 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1845029496] [2021-10-13 00:45:29,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1845029496] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:45:29,105 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:45:29,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-10-13 00:45:29,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055870766] [2021-10-13 00:45:29,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-13 00:45:29,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:29,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-13 00:45:29,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-10-13 00:45:29,107 INFO L87 Difference]: Start difference. First operand 124 states and 151 transitions. Second operand has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:45:29,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:29,894 INFO L93 Difference]: Finished difference Result 167 states and 209 transitions. [2021-10-13 00:45:29,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-13 00:45:29,895 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 44 [2021-10-13 00:45:29,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:29,897 INFO L225 Difference]: With dead ends: 167 [2021-10-13 00:45:29,897 INFO L226 Difference]: Without dead ends: 167 [2021-10-13 00:45:29,898 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 334.2ms TimeCoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2021-10-13 00:45:29,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-10-13 00:45:29,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 129. [2021-10-13 00:45:29,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 89 states have (on average 1.5842696629213484) internal successors, (141), 112 states have internal predecessors, (141), 10 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (10), 8 states have call predecessors, (10), 9 states have call successors, (10) [2021-10-13 00:45:29,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 161 transitions. [2021-10-13 00:45:29,905 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 161 transitions. Word has length 44 [2021-10-13 00:45:29,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:29,906 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 161 transitions. [2021-10-13 00:45:29,906 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:45:29,906 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 161 transitions. [2021-10-13 00:45:29,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-10-13 00:45:29,907 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:29,908 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:45:29,908 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-10-13 00:45:29,908 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting sll_remove_lastErr3REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:29,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:29,909 INFO L82 PathProgramCache]: Analyzing trace with hash -277316195, now seen corresponding path program 1 times [2021-10-13 00:45:29,909 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:29,909 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118050113] [2021-10-13 00:45:29,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:29,910 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:29,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:30,028 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:30,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:30,050 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:30,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:30,150 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:30,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:30,156 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:30,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:30,213 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-13 00:45:30,213 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:30,213 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2118050113] [2021-10-13 00:45:30,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2118050113] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:45:30,214 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:45:30,214 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-10-13 00:45:30,214 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851844684] [2021-10-13 00:45:30,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-13 00:45:30,215 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:30,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-13 00:45:30,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-10-13 00:45:30,216 INFO L87 Difference]: Start difference. First operand 129 states and 161 transitions. Second operand has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:45:31,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:31,040 INFO L93 Difference]: Finished difference Result 170 states and 212 transitions. [2021-10-13 00:45:31,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-13 00:45:31,041 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 44 [2021-10-13 00:45:31,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:31,043 INFO L225 Difference]: With dead ends: 170 [2021-10-13 00:45:31,043 INFO L226 Difference]: Without dead ends: 170 [2021-10-13 00:45:31,043 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 389.3ms TimeCoverageRelationStatistics Valid=75, Invalid=431, Unknown=0, NotChecked=0, Total=506 [2021-10-13 00:45:31,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-10-13 00:45:31,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 129. [2021-10-13 00:45:31,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 89 states have (on average 1.5617977528089888) internal successors, (139), 112 states have internal predecessors, (139), 10 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (10), 8 states have call predecessors, (10), 9 states have call successors, (10) [2021-10-13 00:45:31,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 159 transitions. [2021-10-13 00:45:31,051 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 159 transitions. Word has length 44 [2021-10-13 00:45:31,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:31,052 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 159 transitions. [2021-10-13 00:45:31,052 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:45:31,052 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 159 transitions. [2021-10-13 00:45:31,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-10-13 00:45:31,053 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:31,053 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:45:31,053 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-10-13 00:45:31,053 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting sll_remove_lastErr6ASSERT_VIOLATIONMEMORY_FREE === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:31,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:31,054 INFO L82 PathProgramCache]: Analyzing trace with hash 1990344068, now seen corresponding path program 1 times [2021-10-13 00:45:31,054 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:31,054 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2097188093] [2021-10-13 00:45:31,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:31,055 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:31,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:31,139 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:31,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:31,158 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:31,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:31,220 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:31,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:31,226 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:31,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:31,259 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-13 00:45:31,259 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:31,259 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2097188093] [2021-10-13 00:45:31,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2097188093] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:45:31,260 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:45:31,260 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-10-13 00:45:31,260 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468280873] [2021-10-13 00:45:31,261 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-13 00:45:31,261 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:31,262 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-13 00:45:31,262 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-10-13 00:45:31,262 INFO L87 Difference]: Start difference. First operand 129 states and 159 transitions. Second operand has 15 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 10 states have internal predecessors, (36), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:45:31,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:31,906 INFO L93 Difference]: Finished difference Result 128 states and 157 transitions. [2021-10-13 00:45:31,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-10-13 00:45:31,907 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 10 states have internal predecessors, (36), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 47 [2021-10-13 00:45:31,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:31,908 INFO L225 Difference]: With dead ends: 128 [2021-10-13 00:45:31,908 INFO L226 Difference]: Without dead ends: 128 [2021-10-13 00:45:31,909 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 343.1ms TimeCoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2021-10-13 00:45:31,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-10-13 00:45:31,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 128. [2021-10-13 00:45:31,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 89 states have (on average 1.5393258426966292) internal successors, (137), 111 states have internal predecessors, (137), 10 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (10), 8 states have call predecessors, (10), 9 states have call successors, (10) [2021-10-13 00:45:31,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 157 transitions. [2021-10-13 00:45:31,915 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 157 transitions. Word has length 47 [2021-10-13 00:45:31,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:31,916 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 157 transitions. [2021-10-13 00:45:31,916 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 10 states have internal predecessors, (36), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:45:31,916 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 157 transitions. [2021-10-13 00:45:31,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-10-13 00:45:31,917 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:31,917 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:45:31,918 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-10-13 00:45:31,918 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting sll_remove_lastErr13REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:31,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:31,919 INFO L82 PathProgramCache]: Analyzing trace with hash 1571555042, now seen corresponding path program 1 times [2021-10-13 00:45:31,919 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:31,919 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181554654] [2021-10-13 00:45:31,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:31,919 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:31,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:32,001 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:32,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:32,027 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:32,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:32,045 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:32,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:32,053 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:32,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:32,059 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-13 00:45:32,060 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:32,060 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1181554654] [2021-10-13 00:45:32,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1181554654] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:45:32,060 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:45:32,060 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-10-13 00:45:32,063 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396533245] [2021-10-13 00:45:32,064 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 00:45:32,065 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:32,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 00:45:32,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-10-13 00:45:32,069 INFO L87 Difference]: Start difference. First operand 128 states and 157 transitions. Second operand has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 1 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:45:32,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:32,450 INFO L93 Difference]: Finished difference Result 129 states and 157 transitions. [2021-10-13 00:45:32,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-13 00:45:32,450 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 1 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 48 [2021-10-13 00:45:32,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:32,451 INFO L225 Difference]: With dead ends: 129 [2021-10-13 00:45:32,452 INFO L226 Difference]: Without dead ends: 129 [2021-10-13 00:45:32,452 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 214.8ms TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2021-10-13 00:45:32,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-10-13 00:45:32,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 128. [2021-10-13 00:45:32,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 91 states have (on average 1.5054945054945055) internal successors, (137), 111 states have internal predecessors, (137), 10 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (10), 8 states have call predecessors, (10), 9 states have call successors, (10) [2021-10-13 00:45:32,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 157 transitions. [2021-10-13 00:45:32,466 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 157 transitions. Word has length 48 [2021-10-13 00:45:32,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:32,467 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 157 transitions. [2021-10-13 00:45:32,467 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 1 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:45:32,467 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 157 transitions. [2021-10-13 00:45:32,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-10-13 00:45:32,469 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:32,469 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:45:32,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-10-13 00:45:32,469 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting sll_remove_lastErr14REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:32,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:32,470 INFO L82 PathProgramCache]: Analyzing trace with hash 1571555043, now seen corresponding path program 1 times [2021-10-13 00:45:32,470 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:32,470 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [299496672] [2021-10-13 00:45:32,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:32,471 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:32,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:32,675 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:32,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:32,697 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:32,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:32,805 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:32,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:32,811 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:32,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:32,871 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-13 00:45:32,871 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:32,871 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [299496672] [2021-10-13 00:45:32,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [299496672] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:45:32,872 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:45:32,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-10-13 00:45:32,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279983867] [2021-10-13 00:45:32,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-10-13 00:45:32,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:32,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-10-13 00:45:32,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2021-10-13 00:45:32,874 INFO L87 Difference]: Start difference. First operand 128 states and 157 transitions. Second operand has 17 states, 16 states have (on average 2.3125) internal successors, (37), 12 states have internal predecessors, (37), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:45:33,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:33,834 INFO L93 Difference]: Finished difference Result 190 states and 234 transitions. [2021-10-13 00:45:33,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-10-13 00:45:33,835 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.3125) internal successors, (37), 12 states have internal predecessors, (37), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 48 [2021-10-13 00:45:33,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:33,837 INFO L225 Difference]: With dead ends: 190 [2021-10-13 00:45:33,837 INFO L226 Difference]: Without dead ends: 190 [2021-10-13 00:45:33,838 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 521.8ms TimeCoverageRelationStatistics Valid=107, Invalid=649, Unknown=0, NotChecked=0, Total=756 [2021-10-13 00:45:33,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-10-13 00:45:33,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 152. [2021-10-13 00:45:33,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 113 states have (on average 1.5044247787610618) internal successors, (170), 135 states have internal predecessors, (170), 10 states have call successors, (10), 8 states have call predecessors, (10), 8 states have return successors, (12), 8 states have call predecessors, (12), 9 states have call successors, (12) [2021-10-13 00:45:33,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 192 transitions. [2021-10-13 00:45:33,849 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 192 transitions. Word has length 48 [2021-10-13 00:45:33,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:33,850 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 192 transitions. [2021-10-13 00:45:33,850 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.3125) internal successors, (37), 12 states have internal predecessors, (37), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:45:33,850 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 192 transitions. [2021-10-13 00:45:33,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-10-13 00:45:33,851 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:33,851 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:45:33,852 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-10-13 00:45:33,852 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting sll_remove_lastErr7ASSERT_VIOLATIONMEMORY_FREE === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:33,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:33,852 INFO L82 PathProgramCache]: Analyzing trace with hash 1571124093, now seen corresponding path program 1 times [2021-10-13 00:45:33,853 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:33,853 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [771424699] [2021-10-13 00:45:33,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:33,853 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:33,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:33,942 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:33,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:33,961 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:33,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:34,029 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:34,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:34,035 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:34,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:34,072 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-13 00:45:34,072 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:34,072 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [771424699] [2021-10-13 00:45:34,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [771424699] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:45:34,073 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:45:34,073 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-10-13 00:45:34,073 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348548828] [2021-10-13 00:45:34,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-13 00:45:34,074 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:34,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-13 00:45:34,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-10-13 00:45:34,075 INFO L87 Difference]: Start difference. First operand 152 states and 192 transitions. Second operand has 15 states, 14 states have (on average 2.642857142857143) internal successors, (37), 10 states have internal predecessors, (37), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:45:34,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:34,821 INFO L93 Difference]: Finished difference Result 184 states and 230 transitions. [2021-10-13 00:45:34,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-10-13 00:45:34,821 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.642857142857143) internal successors, (37), 10 states have internal predecessors, (37), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 48 [2021-10-13 00:45:34,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:34,823 INFO L225 Difference]: With dead ends: 184 [2021-10-13 00:45:34,823 INFO L226 Difference]: Without dead ends: 184 [2021-10-13 00:45:34,824 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 353.3ms TimeCoverageRelationStatistics Valid=88, Invalid=512, Unknown=0, NotChecked=0, Total=600 [2021-10-13 00:45:34,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-10-13 00:45:34,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 158. [2021-10-13 00:45:34,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 119 states have (on average 1.4873949579831933) internal successors, (177), 141 states have internal predecessors, (177), 10 states have call successors, (10), 8 states have call predecessors, (10), 8 states have return successors, (12), 8 states have call predecessors, (12), 9 states have call successors, (12) [2021-10-13 00:45:34,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 199 transitions. [2021-10-13 00:45:34,831 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 199 transitions. Word has length 48 [2021-10-13 00:45:34,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:34,831 INFO L470 AbstractCegarLoop]: Abstraction has 158 states and 199 transitions. [2021-10-13 00:45:34,832 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.642857142857143) internal successors, (37), 10 states have internal predecessors, (37), 2 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:45:34,832 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 199 transitions. [2021-10-13 00:45:34,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-10-13 00:45:34,833 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:34,833 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:45:34,833 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-10-13 00:45:34,833 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting sll_remove_lastErr8ASSERT_VIOLATIONMEMORY_FREE === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:34,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:34,834 INFO L82 PathProgramCache]: Analyzing trace with hash 1460206758, now seen corresponding path program 1 times [2021-10-13 00:45:34,834 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:34,834 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237074307] [2021-10-13 00:45:34,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:34,835 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:34,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:34,898 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:34,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:34,919 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:34,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:34,933 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:34,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:34,940 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:34,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:34,945 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-13 00:45:34,946 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:34,946 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237074307] [2021-10-13 00:45:34,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [237074307] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:45:34,946 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:45:34,946 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-10-13 00:45:34,947 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798413778] [2021-10-13 00:45:34,947 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-13 00:45:34,948 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:34,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-13 00:45:34,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-10-13 00:45:34,949 INFO L87 Difference]: Start difference. First operand 158 states and 199 transitions. Second operand has 7 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 1 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:45:35,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:35,264 INFO L93 Difference]: Finished difference Result 157 states and 197 transitions. [2021-10-13 00:45:35,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 00:45:35,268 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 1 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 49 [2021-10-13 00:45:35,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:35,269 INFO L225 Difference]: With dead ends: 157 [2021-10-13 00:45:35,269 INFO L226 Difference]: Without dead ends: 157 [2021-10-13 00:45:35,270 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 162.1ms TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2021-10-13 00:45:35,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-10-13 00:45:35,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2021-10-13 00:45:35,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 119 states have (on average 1.4705882352941178) internal successors, (175), 140 states have internal predecessors, (175), 10 states have call successors, (10), 8 states have call predecessors, (10), 8 states have return successors, (12), 8 states have call predecessors, (12), 9 states have call successors, (12) [2021-10-13 00:45:35,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 197 transitions. [2021-10-13 00:45:35,281 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 197 transitions. Word has length 49 [2021-10-13 00:45:35,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:35,281 INFO L470 AbstractCegarLoop]: Abstraction has 157 states and 197 transitions. [2021-10-13 00:45:35,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 1 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:45:35,282 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 197 transitions. [2021-10-13 00:45:35,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-10-13 00:45:35,283 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:35,283 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:45:35,283 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-10-13 00:45:35,283 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting sll_remove_lastErr17REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:35,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:35,284 INFO L82 PathProgramCache]: Analyzing trace with hash -1564089940, now seen corresponding path program 1 times [2021-10-13 00:45:35,284 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:35,284 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [342629778] [2021-10-13 00:45:35,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:35,285 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:35,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:35,433 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:35,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:35,457 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:35,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:35,637 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:35,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:35,695 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:35,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:35,749 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:45:35,749 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:35,749 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [342629778] [2021-10-13 00:45:35,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [342629778] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:35,750 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1506160349] [2021-10-13 00:45:35,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:35,750 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:35,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:45:35,751 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:45:35,779 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-10-13 00:45:35,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:35,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 25 conjunts are in the unsatisfiable core [2021-10-13 00:45:35,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:45:36,461 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 00:45:36,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 72 treesize of output 57 [2021-10-13 00:45:36,471 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 00:45:36,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 51 treesize of output 44 [2021-10-13 00:45:36,527 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-13 00:45:36,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1506160349] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:45:36,527 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-10-13 00:45:36,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [23] total 29 [2021-10-13 00:45:36,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077217843] [2021-10-13 00:45:36,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 00:45:36,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:36,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 00:45:36,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=753, Unknown=0, NotChecked=0, Total=812 [2021-10-13 00:45:36,529 INFO L87 Difference]: Start difference. First operand 157 states and 197 transitions. Second operand has 8 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:45:36,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:36,858 INFO L93 Difference]: Finished difference Result 153 states and 185 transitions. [2021-10-13 00:45:36,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 00:45:36,859 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 50 [2021-10-13 00:45:36,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:36,861 INFO L225 Difference]: With dead ends: 153 [2021-10-13 00:45:36,861 INFO L226 Difference]: Without dead ends: 153 [2021-10-13 00:45:36,862 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 665.3ms TimeCoverageRelationStatistics Valid=77, Invalid=979, Unknown=0, NotChecked=0, Total=1056 [2021-10-13 00:45:36,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-10-13 00:45:36,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 147. [2021-10-13 00:45:36,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 111 states have (on average 1.4324324324324325) internal successors, (159), 130 states have internal predecessors, (159), 10 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (10), 8 states have call predecessors, (10), 9 states have call successors, (10) [2021-10-13 00:45:36,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 179 transitions. [2021-10-13 00:45:36,868 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 179 transitions. Word has length 50 [2021-10-13 00:45:36,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:36,868 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 179 transitions. [2021-10-13 00:45:36,869 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:45:36,869 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 179 transitions. [2021-10-13 00:45:36,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-10-13 00:45:36,870 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:36,870 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:45:36,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-10-13 00:45:37,084 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-10-13 00:45:37,084 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting sll_remove_lastErr9REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:37,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:37,084 INFO L82 PathProgramCache]: Analyzing trace with hash -1978230624, now seen corresponding path program 1 times [2021-10-13 00:45:37,084 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:37,084 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491661896] [2021-10-13 00:45:37,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:37,085 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:37,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:37,193 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:37,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:37,214 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:37,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:37,336 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:37,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:37,459 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:37,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:37,508 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:45:37,509 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:37,509 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491661896] [2021-10-13 00:45:37,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1491661896] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:37,509 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [462074685] [2021-10-13 00:45:37,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:37,509 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:37,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:45:37,512 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:45:37,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-10-13 00:45:37,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:37,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 00:45:37,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:45:38,073 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 00:45:38,073 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 [2021-10-13 00:45:38,120 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-13 00:45:38,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [462074685] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:45:38,121 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-10-13 00:45:38,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [21] total 27 [2021-10-13 00:45:38,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143802508] [2021-10-13 00:45:38,121 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 00:45:38,121 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:38,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 00:45:38,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=687, Unknown=0, NotChecked=0, Total=756 [2021-10-13 00:45:38,122 INFO L87 Difference]: Start difference. First operand 147 states and 179 transitions. Second operand has 8 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:45:38,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:38,311 INFO L93 Difference]: Finished difference Result 150 states and 183 transitions. [2021-10-13 00:45:38,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 00:45:38,312 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 50 [2021-10-13 00:45:38,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:38,313 INFO L225 Difference]: With dead ends: 150 [2021-10-13 00:45:38,313 INFO L226 Difference]: Without dead ends: 150 [2021-10-13 00:45:38,313 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 505.8ms TimeCoverageRelationStatistics Valid=99, Invalid=893, Unknown=0, NotChecked=0, Total=992 [2021-10-13 00:45:38,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-10-13 00:45:38,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 146. [2021-10-13 00:45:38,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 111 states have (on average 1.4144144144144144) internal successors, (157), 129 states have internal predecessors, (157), 10 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (10), 8 states have call predecessors, (10), 9 states have call successors, (10) [2021-10-13 00:45:38,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 177 transitions. [2021-10-13 00:45:38,320 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 177 transitions. Word has length 50 [2021-10-13 00:45:38,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:38,320 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 177 transitions. [2021-10-13 00:45:38,321 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:45:38,321 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 177 transitions. [2021-10-13 00:45:38,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-10-13 00:45:38,322 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:38,322 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:45:38,353 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-10-13 00:45:38,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-10-13 00:45:38,535 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting sll_remove_lastErr13REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:38,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:38,536 INFO L82 PathProgramCache]: Analyzing trace with hash 148177176, now seen corresponding path program 1 times [2021-10-13 00:45:38,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:38,536 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1742931202] [2021-10-13 00:45:38,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:38,536 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:38,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:38,706 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:38,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:38,730 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:38,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:38,929 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:38,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:38,980 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:38,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:39,083 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:45:39,083 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:39,083 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1742931202] [2021-10-13 00:45:39,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1742931202] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:39,083 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2090936510] [2021-10-13 00:45:39,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:39,084 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:39,084 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:45:39,088 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:45:39,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-10-13 00:45:39,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:39,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 86 conjunts are in the unsatisfiable core [2021-10-13 00:45:39,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:45:39,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:45:39,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-10-13 00:45:39,588 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-10-13 00:45:39,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:45:39,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2021-10-13 00:45:39,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:45:39,672 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2021-10-13 00:45:39,810 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-10-13 00:45:39,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-10-13 00:45:39,960 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 00:45:39,961 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 22 [2021-10-13 00:45:39,972 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 00:45:39,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-10-13 00:45:40,832 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-10-13 00:45:40,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 69 treesize of output 55 [2021-10-13 00:45:41,023 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 00:45:41,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 21 [2021-10-13 00:45:41,125 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:45:41,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2090936510] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:41,127 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:45:41,127 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 26] total 43 [2021-10-13 00:45:41,127 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266661293] [2021-10-13 00:45:41,127 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-10-13 00:45:41,128 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:41,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-10-13 00:45:41,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=1765, Unknown=0, NotChecked=0, Total=1892 [2021-10-13 00:45:41,129 INFO L87 Difference]: Start difference. First operand 146 states and 177 transitions. Second operand has 44 states, 42 states have (on average 1.7619047619047619) internal successors, (74), 34 states have internal predecessors, (74), 5 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) [2021-10-13 00:45:43,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:43,257 INFO L93 Difference]: Finished difference Result 180 states and 217 transitions. [2021-10-13 00:45:43,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-10-13 00:45:43,258 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 42 states have (on average 1.7619047619047619) internal successors, (74), 34 states have internal predecessors, (74), 5 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) Word has length 52 [2021-10-13 00:45:43,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:43,259 INFO L225 Difference]: With dead ends: 180 [2021-10-13 00:45:43,260 INFO L226 Difference]: Without dead ends: 180 [2021-10-13 00:45:43,261 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 575 ImplicationChecksByTransitivity, 2088.8ms TimeCoverageRelationStatistics Valid=313, Invalid=3227, Unknown=0, NotChecked=0, Total=3540 [2021-10-13 00:45:43,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-10-13 00:45:43,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 150. [2021-10-13 00:45:43,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 115 states have (on average 1.4173913043478261) internal successors, (163), 133 states have internal predecessors, (163), 10 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (10), 8 states have call predecessors, (10), 9 states have call successors, (10) [2021-10-13 00:45:43,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 183 transitions. [2021-10-13 00:45:43,268 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 183 transitions. Word has length 52 [2021-10-13 00:45:43,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:43,269 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 183 transitions. [2021-10-13 00:45:43,269 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 42 states have (on average 1.7619047619047619) internal successors, (74), 34 states have internal predecessors, (74), 5 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) [2021-10-13 00:45:43,269 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 183 transitions. [2021-10-13 00:45:43,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-10-13 00:45:43,270 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:43,270 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:45:43,304 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-10-13 00:45:43,484 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:43,484 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting sll_remove_lastErr14REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:43,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:43,484 INFO L82 PathProgramCache]: Analyzing trace with hash 148177177, now seen corresponding path program 1 times [2021-10-13 00:45:43,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:43,484 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1827119125] [2021-10-13 00:45:43,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:43,485 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:43,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:43,692 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:43,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:43,717 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:43,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:43,927 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:43,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:43,997 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:44,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:44,103 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:45:44,103 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:44,103 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1827119125] [2021-10-13 00:45:44,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1827119125] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:44,103 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2132939184] [2021-10-13 00:45:44,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:44,104 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:44,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:45:44,108 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:45:44,132 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-10-13 00:45:44,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:44,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 84 conjunts are in the unsatisfiable core [2021-10-13 00:45:44,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:45:44,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:45:44,747 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 00:45:44,747 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 12 treesize of output 14 [2021-10-13 00:45:44,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-10-13 00:45:44,863 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-10-13 00:45:45,673 INFO L354 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2021-10-13 00:45:45,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 43 [2021-10-13 00:45:45,683 INFO L354 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2021-10-13 00:45:45,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 31 [2021-10-13 00:45:45,734 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:45:45,734 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2132939184] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:45,735 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:45:45,735 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 38 [2021-10-13 00:45:45,735 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966891806] [2021-10-13 00:45:45,735 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-10-13 00:45:45,736 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:45,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-10-13 00:45:45,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1397, Unknown=0, NotChecked=0, Total=1482 [2021-10-13 00:45:45,737 INFO L87 Difference]: Start difference. First operand 150 states and 183 transitions. Second operand has 39 states, 37 states have (on average 1.8918918918918919) internal successors, (70), 29 states have internal predecessors, (70), 5 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) [2021-10-13 00:45:48,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:48,503 INFO L93 Difference]: Finished difference Result 195 states and 234 transitions. [2021-10-13 00:45:48,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-10-13 00:45:48,503 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 37 states have (on average 1.8918918918918919) internal successors, (70), 29 states have internal predecessors, (70), 5 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) Word has length 52 [2021-10-13 00:45:48,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:48,507 INFO L225 Difference]: With dead ends: 195 [2021-10-13 00:45:48,507 INFO L226 Difference]: Without dead ends: 195 [2021-10-13 00:45:48,509 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 2371.8ms TimeCoverageRelationStatistics Valid=268, Invalid=2924, Unknown=0, NotChecked=0, Total=3192 [2021-10-13 00:45:48,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-10-13 00:45:48,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 166. [2021-10-13 00:45:48,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 129 states have (on average 1.4186046511627908) internal successors, (183), 149 states have internal predecessors, (183), 10 states have call successors, (10), 8 states have call predecessors, (10), 8 states have return successors, (12), 8 states have call predecessors, (12), 9 states have call successors, (12) [2021-10-13 00:45:48,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 205 transitions. [2021-10-13 00:45:48,516 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 205 transitions. Word has length 52 [2021-10-13 00:45:48,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:48,517 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 205 transitions. [2021-10-13 00:45:48,517 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 37 states have (on average 1.8918918918918919) internal successors, (70), 29 states have internal predecessors, (70), 5 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) [2021-10-13 00:45:48,517 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 205 transitions. [2021-10-13 00:45:48,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-10-13 00:45:48,518 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:48,518 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:45:48,559 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-10-13 00:45:48,732 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:48,732 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting sll_remove_lastErr17REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:48,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:48,732 INFO L82 PathProgramCache]: Analyzing trace with hash 664348258, now seen corresponding path program 1 times [2021-10-13 00:45:48,732 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:48,732 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472428925] [2021-10-13 00:45:48,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:48,733 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:48,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:48,821 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:48,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:48,839 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:48,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:48,849 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:48,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:48,857 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:48,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:48,862 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-13 00:45:48,863 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:48,863 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472428925] [2021-10-13 00:45:48,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1472428925] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:48,863 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2047310483] [2021-10-13 00:45:48,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:48,864 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:48,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:45:48,865 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:45:48,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-10-13 00:45:49,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:49,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 9 conjunts are in the unsatisfiable core [2021-10-13 00:45:49,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:45:49,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-10-13 00:45:49,378 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-13 00:45:49,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2047310483] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:49,378 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:45:49,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 3] total 8 [2021-10-13 00:45:49,379 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704984784] [2021-10-13 00:45:49,379 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-13 00:45:49,380 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:49,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-13 00:45:49,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-10-13 00:45:49,381 INFO L87 Difference]: Start difference. First operand 166 states and 205 transitions. Second operand has 9 states, 8 states have (on average 5.25) internal successors, (42), 7 states have internal predecessors, (42), 1 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:45:49,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:49,766 INFO L93 Difference]: Finished difference Result 166 states and 201 transitions. [2021-10-13 00:45:49,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-10-13 00:45:49,766 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 5.25) internal successors, (42), 7 states have internal predecessors, (42), 1 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 54 [2021-10-13 00:45:49,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:49,767 INFO L225 Difference]: With dead ends: 166 [2021-10-13 00:45:49,767 INFO L226 Difference]: Without dead ends: 166 [2021-10-13 00:45:49,767 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 248.9ms TimeCoverageRelationStatistics Valid=81, Invalid=225, Unknown=0, NotChecked=0, Total=306 [2021-10-13 00:45:49,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-10-13 00:45:49,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 165. [2021-10-13 00:45:49,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 129 states have (on average 1.3875968992248062) internal successors, (179), 148 states have internal predecessors, (179), 10 states have call successors, (10), 8 states have call predecessors, (10), 8 states have return successors, (12), 8 states have call predecessors, (12), 9 states have call successors, (12) [2021-10-13 00:45:49,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 201 transitions. [2021-10-13 00:45:49,774 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 201 transitions. Word has length 54 [2021-10-13 00:45:49,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:49,775 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 201 transitions. [2021-10-13 00:45:49,775 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 5.25) internal successors, (42), 7 states have internal predecessors, (42), 1 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:45:49,775 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 201 transitions. [2021-10-13 00:45:49,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-10-13 00:45:49,776 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:49,776 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:45:49,818 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-10-13 00:45:49,994 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:49,995 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting sll_remove_lastErr18REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:49,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:49,995 INFO L82 PathProgramCache]: Analyzing trace with hash 664348259, now seen corresponding path program 1 times [2021-10-13 00:45:49,995 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:49,995 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1698484666] [2021-10-13 00:45:49,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:49,995 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:50,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:50,202 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:50,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:50,226 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:50,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:50,347 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:50,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:50,352 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:50,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:50,417 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-13 00:45:50,417 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:50,417 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1698484666] [2021-10-13 00:45:50,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1698484666] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:50,417 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [64472117] [2021-10-13 00:45:50,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:50,418 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:50,418 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:45:50,420 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:45:50,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-10-13 00:45:50,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:50,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 11 conjunts are in the unsatisfiable core [2021-10-13 00:45:50,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:45:50,880 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-10-13 00:45:50,976 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-13 00:45:50,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [64472117] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:50,977 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:45:50,977 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 3] total 19 [2021-10-13 00:45:50,978 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578960788] [2021-10-13 00:45:50,980 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-10-13 00:45:50,980 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:50,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-10-13 00:45:50,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=340, Unknown=0, NotChecked=0, Total=380 [2021-10-13 00:45:50,982 INFO L87 Difference]: Start difference. First operand 165 states and 201 transitions. Second operand has 20 states, 19 states have (on average 3.3684210526315788) internal successors, (64), 15 states have internal predecessors, (64), 2 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (5), 3 states have call predecessors, (5), 1 states have call successors, (5) [2021-10-13 00:45:52,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:52,567 INFO L93 Difference]: Finished difference Result 190 states and 222 transitions. [2021-10-13 00:45:52,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-10-13 00:45:52,569 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 3.3684210526315788) internal successors, (64), 15 states have internal predecessors, (64), 2 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (5), 3 states have call predecessors, (5), 1 states have call successors, (5) Word has length 54 [2021-10-13 00:45:52,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:52,570 INFO L225 Difference]: With dead ends: 190 [2021-10-13 00:45:52,570 INFO L226 Difference]: Without dead ends: 190 [2021-10-13 00:45:52,571 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1164.9ms TimeCoverageRelationStatistics Valid=253, Invalid=1469, Unknown=0, NotChecked=0, Total=1722 [2021-10-13 00:45:52,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-10-13 00:45:52,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 161. [2021-10-13 00:45:52,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 127 states have (on average 1.3464566929133859) internal successors, (171), 144 states have internal predecessors, (171), 10 states have call successors, (10), 8 states have call predecessors, (10), 8 states have return successors, (12), 8 states have call predecessors, (12), 9 states have call successors, (12) [2021-10-13 00:45:52,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 193 transitions. [2021-10-13 00:45:52,583 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 193 transitions. Word has length 54 [2021-10-13 00:45:52,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:52,583 INFO L470 AbstractCegarLoop]: Abstraction has 161 states and 193 transitions. [2021-10-13 00:45:52,584 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 3.3684210526315788) internal successors, (64), 15 states have internal predecessors, (64), 2 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (5), 3 states have call predecessors, (5), 1 states have call successors, (5) [2021-10-13 00:45:52,584 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 193 transitions. [2021-10-13 00:45:52,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-10-13 00:45:52,585 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:52,585 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:45:52,609 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-10-13 00:45:52,792 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:52,792 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting mainErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:52,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:52,792 INFO L82 PathProgramCache]: Analyzing trace with hash -879338143, now seen corresponding path program 1 times [2021-10-13 00:45:52,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:52,792 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8794180] [2021-10-13 00:45:52,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:52,793 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:52,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:52,840 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:52,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:52,855 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:52,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:52,875 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:52,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:52,881 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:52,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:52,897 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-10-13 00:45:52,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:52,919 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-13 00:45:52,919 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:52,919 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8794180] [2021-10-13 00:45:52,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [8794180] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:45:52,920 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:45:52,920 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-10-13 00:45:52,920 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421815715] [2021-10-13 00:45:52,921 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 00:45:52,921 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:52,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 00:45:52,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-10-13 00:45:52,922 INFO L87 Difference]: Start difference. First operand 161 states and 193 transitions. Second operand has 8 states, 7 states have (on average 4.714285714285714) internal successors, (33), 5 states have internal predecessors, (33), 1 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:45:53,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:53,236 INFO L93 Difference]: Finished difference Result 179 states and 219 transitions. [2021-10-13 00:45:53,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-13 00:45:53,236 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.714285714285714) internal successors, (33), 5 states have internal predecessors, (33), 1 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 55 [2021-10-13 00:45:53,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:53,238 INFO L225 Difference]: With dead ends: 179 [2021-10-13 00:45:53,238 INFO L226 Difference]: Without dead ends: 179 [2021-10-13 00:45:53,238 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 162.4ms TimeCoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2021-10-13 00:45:53,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-10-13 00:45:53,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 177. [2021-10-13 00:45:53,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 139 states have (on average 1.3453237410071943) internal successors, (187), 156 states have internal predecessors, (187), 12 states have call successors, (12), 10 states have call predecessors, (12), 10 states have return successors, (20), 10 states have call predecessors, (20), 11 states have call successors, (20) [2021-10-13 00:45:53,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 219 transitions. [2021-10-13 00:45:53,246 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 219 transitions. Word has length 55 [2021-10-13 00:45:53,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:53,247 INFO L470 AbstractCegarLoop]: Abstraction has 177 states and 219 transitions. [2021-10-13 00:45:53,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.714285714285714) internal successors, (33), 5 states have internal predecessors, (33), 1 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:45:53,247 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 219 transitions. [2021-10-13 00:45:53,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-10-13 00:45:53,248 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:53,248 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:45:53,248 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-10-13 00:45:53,249 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting sll_remove_lastErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:53,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:53,249 INFO L82 PathProgramCache]: Analyzing trace with hash 1178990387, now seen corresponding path program 2 times [2021-10-13 00:45:53,249 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:53,250 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1992730884] [2021-10-13 00:45:53,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:53,250 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:53,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:53,305 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:53,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:53,321 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:53,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:53,385 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:53,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:53,392 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:53,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:53,400 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-10-13 00:45:53,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:53,408 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 1 proven. 20 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-10-13 00:45:53,408 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:53,408 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1992730884] [2021-10-13 00:45:53,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1992730884] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:53,409 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [571784692] [2021-10-13 00:45:53,409 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 00:45:53,409 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:53,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:45:53,411 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:45:53,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-10-13 00:45:53,897 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 00:45:53,897 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 00:45:53,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 00:45:53,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:45:54,112 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-10-13 00:45:54,112 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [571784692] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:54,112 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:45:54,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 11 [2021-10-13 00:45:54,113 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475686580] [2021-10-13 00:45:54,113 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-10-13 00:45:54,113 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:54,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-10-13 00:45:54,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-10-13 00:45:54,114 INFO L87 Difference]: Start difference. First operand 177 states and 219 transitions. Second operand has 11 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 8 states have call successors, (12), 4 states have call predecessors, (12), 2 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-10-13 00:45:54,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:54,376 INFO L93 Difference]: Finished difference Result 113 states and 127 transitions. [2021-10-13 00:45:54,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-13 00:45:54,376 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 8 states have call successors, (12), 4 states have call predecessors, (12), 2 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) Word has length 56 [2021-10-13 00:45:54,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:54,378 INFO L225 Difference]: With dead ends: 113 [2021-10-13 00:45:54,378 INFO L226 Difference]: Without dead ends: 104 [2021-10-13 00:45:54,378 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 121.9ms TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-10-13 00:45:54,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-10-13 00:45:54,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2021-10-13 00:45:54,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 79 states have (on average 1.2278481012658229) internal successors, (97), 90 states have internal predecessors, (97), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (11), 6 states have call predecessors, (11), 7 states have call successors, (11) [2021-10-13 00:45:54,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 116 transitions. [2021-10-13 00:45:54,383 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 116 transitions. Word has length 56 [2021-10-13 00:45:54,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:54,383 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 116 transitions. [2021-10-13 00:45:54,384 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 8 states have call successors, (12), 4 states have call predecessors, (12), 2 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-10-13 00:45:54,384 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 116 transitions. [2021-10-13 00:45:54,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-10-13 00:45:54,384 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:54,385 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:45:54,417 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-10-13 00:45:54,608 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:54,608 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting sll_remove_lastErr20ASSERT_VIOLATIONMEMORY_FREE === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:54,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:54,608 INFO L82 PathProgramCache]: Analyzing trace with hash -1511447838, now seen corresponding path program 1 times [2021-10-13 00:45:54,608 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:54,608 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468011333] [2021-10-13 00:45:54,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:54,609 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:54,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:54,795 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:54,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:54,820 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:54,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:55,034 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:55,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:55,087 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:55,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:55,137 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:45:55,137 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:55,137 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468011333] [2021-10-13 00:45:55,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [468011333] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:55,138 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2102421653] [2021-10-13 00:45:55,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:55,138 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:55,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:45:55,144 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:45:55,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-10-13 00:45:55,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:55,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 51 conjunts are in the unsatisfiable core [2021-10-13 00:45:55,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:45:55,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-10-13 00:45:56,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 26 [2021-10-13 00:45:56,193 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 00:45:56,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 26 [2021-10-13 00:45:56,227 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:45:56,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2102421653] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:56,227 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:45:56,228 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 18] total 33 [2021-10-13 00:45:56,228 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319814365] [2021-10-13 00:45:56,228 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-10-13 00:45:56,228 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:56,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-10-13 00:45:56,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=1050, Unknown=0, NotChecked=0, Total=1122 [2021-10-13 00:45:56,229 INFO L87 Difference]: Start difference. First operand 104 states and 116 transitions. Second operand has 34 states, 32 states have (on average 2.3125) internal successors, (74), 26 states have internal predecessors, (74), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) [2021-10-13 00:45:58,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:58,271 INFO L93 Difference]: Finished difference Result 115 states and 127 transitions. [2021-10-13 00:45:58,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-10-13 00:45:58,272 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 32 states have (on average 2.3125) internal successors, (74), 26 states have internal predecessors, (74), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) Word has length 56 [2021-10-13 00:45:58,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:58,274 INFO L225 Difference]: With dead ends: 115 [2021-10-13 00:45:58,274 INFO L226 Difference]: Without dead ends: 115 [2021-10-13 00:45:58,275 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 270 ImplicationChecksByTransitivity, 1625.5ms TimeCoverageRelationStatistics Valid=236, Invalid=2520, Unknown=0, NotChecked=0, Total=2756 [2021-10-13 00:45:58,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-10-13 00:45:58,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 104. [2021-10-13 00:45:58,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 90 states have internal predecessors, (96), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (11), 6 states have call predecessors, (11), 7 states have call successors, (11) [2021-10-13 00:45:58,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 115 transitions. [2021-10-13 00:45:58,282 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 115 transitions. Word has length 56 [2021-10-13 00:45:58,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:58,282 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 115 transitions. [2021-10-13 00:45:58,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 32 states have (on average 2.3125) internal successors, (74), 26 states have internal predecessors, (74), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) [2021-10-13 00:45:58,283 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 115 transitions. [2021-10-13 00:45:58,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-10-13 00:45:58,283 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:58,284 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:45:58,327 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-10-13 00:45:58,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-10-13 00:45:58,500 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting sll_remove_lastErr13REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:45:58,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:58,500 INFO L82 PathProgramCache]: Analyzing trace with hash -1511395250, now seen corresponding path program 2 times [2021-10-13 00:45:58,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:58,501 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903411913] [2021-10-13 00:45:58,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:58,501 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:58,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:58,792 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:58,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:58,826 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:58,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:59,153 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:45:59,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:59,252 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:45:59,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:59,495 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:45:59,496 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:59,496 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903411913] [2021-10-13 00:45:59,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [903411913] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:59,496 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1686609224] [2021-10-13 00:45:59,496 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 00:45:59,496 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:59,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:45:59,497 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:45:59,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-10-13 00:45:59,895 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 00:45:59,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 00:45:59,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 116 conjunts are in the unsatisfiable core [2021-10-13 00:45:59,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:46:00,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-10-13 00:46:00,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-10-13 00:46:00,538 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 00:46:00,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:46:00,549 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-10-13 00:46:00,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 20 [2021-10-13 00:46:00,560 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-13 00:46:00,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-10-13 00:46:00,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:46:00,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 20 [2021-10-13 00:46:00,750 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 00:46:00,759 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-10-13 00:46:00,760 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 2 case distinctions, treesize of input 59 treesize of output 61 [2021-10-13 00:46:00,765 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 00:46:00,775 INFO L354 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2021-10-13 00:46:00,781 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 2 case distinctions, treesize of input 70 treesize of output 72 [2021-10-13 00:46:02,307 INFO L354 Elim1Store]: treesize reduction 102, result has 9.7 percent of original size [2021-10-13 00:46:02,307 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 9 new quantified variables, introduced 10 case distinctions, treesize of input 141 treesize of output 85 [2021-10-13 00:46:02,339 INFO L354 Elim1Store]: treesize reduction 78, result has 8.2 percent of original size [2021-10-13 00:46:02,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 10 case distinctions, treesize of input 52 treesize of output 40 [2021-10-13 00:46:02,401 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 11 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:46:02,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1686609224] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:46:02,401 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:46:02,401 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 32] total 54 [2021-10-13 00:46:02,401 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542172572] [2021-10-13 00:46:02,402 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-10-13 00:46:02,402 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:46:02,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-10-13 00:46:02,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=2715, Unknown=0, NotChecked=0, Total=2862 [2021-10-13 00:46:02,404 INFO L87 Difference]: Start difference. First operand 104 states and 115 transitions. Second operand has 54 states, 53 states have (on average 1.5471698113207548) internal successors, (82), 43 states have internal predecessors, (82), 6 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) [2021-10-13 00:46:04,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:46:04,952 INFO L93 Difference]: Finished difference Result 106 states and 115 transitions. [2021-10-13 00:46:04,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-10-13 00:46:04,952 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 1.5471698113207548) internal successors, (82), 43 states have internal predecessors, (82), 6 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) Word has length 56 [2021-10-13 00:46:04,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:46:04,953 INFO L225 Difference]: With dead ends: 106 [2021-10-13 00:46:04,954 INFO L226 Difference]: Without dead ends: 106 [2021-10-13 00:46:04,956 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1247 ImplicationChecksByTransitivity, 3550.0ms TimeCoverageRelationStatistics Valid=383, Invalid=5469, Unknown=0, NotChecked=0, Total=5852 [2021-10-13 00:46:04,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-10-13 00:46:04,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 104. [2021-10-13 00:46:04,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 79 states have (on average 1.2025316455696202) internal successors, (95), 90 states have internal predecessors, (95), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-10-13 00:46:04,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 113 transitions. [2021-10-13 00:46:04,961 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 113 transitions. Word has length 56 [2021-10-13 00:46:04,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:46:04,962 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 113 transitions. [2021-10-13 00:46:04,964 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 53 states have (on average 1.5471698113207548) internal successors, (82), 43 states have internal predecessors, (82), 6 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) [2021-10-13 00:46:04,964 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 113 transitions. [2021-10-13 00:46:04,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-10-13 00:46:04,965 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:46:04,965 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:46:05,012 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-10-13 00:46:05,185 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-10-13 00:46:05,185 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting sll_remove_lastErr2REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:46:05,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:46:05,185 INFO L82 PathProgramCache]: Analyzing trace with hash -1352767032, now seen corresponding path program 1 times [2021-10-13 00:46:05,185 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:46:05,185 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1151677432] [2021-10-13 00:46:05,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:46:05,186 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:46:05,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:05,260 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:46:05,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:05,279 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:46:05,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:05,394 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:46:05,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:05,431 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:46:05,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:05,478 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-10-13 00:46:05,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:05,782 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:46:05,782 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:46:05,782 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1151677432] [2021-10-13 00:46:05,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1151677432] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:46:05,782 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1130958264] [2021-10-13 00:46:05,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:46:05,783 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:46:05,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:46:05,788 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:46:05,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-10-13 00:46:06,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:06,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 58 conjunts are in the unsatisfiable core [2021-10-13 00:46:06,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:46:06,392 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 [2021-10-13 00:46:06,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 17 [2021-10-13 00:46:06,767 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:46:06,767 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1130958264] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:46:06,768 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:46:06,768 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 24] total 35 [2021-10-13 00:46:06,768 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069064682] [2021-10-13 00:46:06,768 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-10-13 00:46:06,768 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:46:06,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-10-13 00:46:06,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=1104, Unknown=0, NotChecked=0, Total=1190 [2021-10-13 00:46:06,770 INFO L87 Difference]: Start difference. First operand 104 states and 113 transitions. Second operand has 35 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 27 states have internal predecessors, (64), 6 states have call successors, (12), 6 states have call predecessors, (12), 5 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 00:46:07,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:46:07,969 INFO L93 Difference]: Finished difference Result 104 states and 112 transitions. [2021-10-13 00:46:07,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-10-13 00:46:07,969 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 27 states have internal predecessors, (64), 6 states have call successors, (12), 6 states have call predecessors, (12), 5 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) Word has length 58 [2021-10-13 00:46:07,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:46:07,970 INFO L225 Difference]: With dead ends: 104 [2021-10-13 00:46:07,970 INFO L226 Difference]: Without dead ends: 101 [2021-10-13 00:46:07,972 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 1202.3ms TimeCoverageRelationStatistics Valid=254, Invalid=2608, Unknown=0, NotChecked=0, Total=2862 [2021-10-13 00:46:07,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-10-13 00:46:07,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2021-10-13 00:46:07,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 76 states have (on average 1.1973684210526316) internal successors, (91), 87 states have internal predecessors, (91), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (9), 6 states have call predecessors, (9), 7 states have call successors, (9) [2021-10-13 00:46:07,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 108 transitions. [2021-10-13 00:46:07,976 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 108 transitions. Word has length 58 [2021-10-13 00:46:07,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:46:07,976 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 108 transitions. [2021-10-13 00:46:07,977 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 27 states have internal predecessors, (64), 6 states have call successors, (12), 6 states have call predecessors, (12), 5 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 00:46:07,977 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 108 transitions. [2021-10-13 00:46:07,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-10-13 00:46:07,978 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:46:07,978 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:46:08,021 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-10-13 00:46:08,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-10-13 00:46:08,192 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting mainErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:46:08,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:46:08,192 INFO L82 PathProgramCache]: Analyzing trace with hash 1118199033, now seen corresponding path program 1 times [2021-10-13 00:46:08,192 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:46:08,192 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789416904] [2021-10-13 00:46:08,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:46:08,193 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:46:08,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:08,243 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:46:08,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:08,256 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:46:08,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:08,280 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:46:08,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:08,287 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:46:08,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:08,302 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-10-13 00:46:08,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:08,311 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-10-13 00:46:08,312 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:46:08,312 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789416904] [2021-10-13 00:46:08,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789416904] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:46:08,312 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1475775552] [2021-10-13 00:46:08,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:46:08,312 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:46:08,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:46:08,325 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:46:08,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-10-13 00:46:09,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:09,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 00:46:09,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:46:09,182 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-10-13 00:46:09,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1475775552] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:46:09,183 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:46:09,183 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 9 [2021-10-13 00:46:09,183 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089736373] [2021-10-13 00:46:09,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-13 00:46:09,184 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:46:09,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-13 00:46:09,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-10-13 00:46:09,185 INFO L87 Difference]: Start difference. First operand 101 states and 108 transitions. Second operand has 9 states, 9 states have (on average 5.0) internal successors, (45), 6 states have internal predecessors, (45), 4 states have call successors, (9), 4 states have call predecessors, (9), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-10-13 00:46:09,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:46:09,382 INFO L93 Difference]: Finished difference Result 103 states and 110 transitions. [2021-10-13 00:46:09,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-13 00:46:09,385 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.0) internal successors, (45), 6 states have internal predecessors, (45), 4 states have call successors, (9), 4 states have call predecessors, (9), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 62 [2021-10-13 00:46:09,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:46:09,385 INFO L225 Difference]: With dead ends: 103 [2021-10-13 00:46:09,386 INFO L226 Difference]: Without dead ends: 103 [2021-10-13 00:46:09,386 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 78.4ms TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-10-13 00:46:09,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-10-13 00:46:09,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-10-13 00:46:09,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 78 states have (on average 1.1923076923076923) internal successors, (93), 88 states have internal predecessors, (93), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-10-13 00:46:09,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 110 transitions. [2021-10-13 00:46:09,390 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 110 transitions. Word has length 62 [2021-10-13 00:46:09,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:46:09,391 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 110 transitions. [2021-10-13 00:46:09,391 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.0) internal successors, (45), 6 states have internal predecessors, (45), 4 states have call successors, (9), 4 states have call predecessors, (9), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-10-13 00:46:09,391 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 110 transitions. [2021-10-13 00:46:09,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-10-13 00:46:09,392 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:46:09,392 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:46:09,419 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-10-13 00:46:09,596 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:46:09,596 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting sll_remove_lastErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:46:09,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:46:09,596 INFO L82 PathProgramCache]: Analyzing trace with hash 847585833, now seen corresponding path program 1 times [2021-10-13 00:46:09,596 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:46:09,596 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554463913] [2021-10-13 00:46:09,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:46:09,597 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:46:09,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:09,671 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:46:09,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:09,689 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:46:09,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:09,705 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:46:09,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:09,711 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:46:09,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:09,729 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-10-13 00:46:09,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:09,832 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-13 00:46:09,832 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:46:09,832 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554463913] [2021-10-13 00:46:09,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [554463913] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:46:09,833 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1341574446] [2021-10-13 00:46:09,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:46:09,833 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:46:09,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:46:09,834 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:46:09,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-10-13 00:46:10,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:10,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 29 conjunts are in the unsatisfiable core [2021-10-13 00:46:10,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:46:10,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:46:10,608 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 [2021-10-13 00:46:10,891 INFO L354 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2021-10-13 00:46:10,891 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 19 [2021-10-13 00:46:10,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-10-13 00:46:11,064 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 00:46:11,064 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 [2021-10-13 00:46:11,251 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-13 00:46:11,251 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1341574446] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:46:11,251 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:46:11,251 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2021-10-13 00:46:11,251 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030728779] [2021-10-13 00:46:11,252 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-10-13 00:46:11,252 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:46:11,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-10-13 00:46:11,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=623, Unknown=0, NotChecked=0, Total=702 [2021-10-13 00:46:11,253 INFO L87 Difference]: Start difference. First operand 103 states and 110 transitions. Second operand has 27 states, 26 states have (on average 3.5) internal successors, (91), 22 states have internal predecessors, (91), 7 states have call successors, (12), 7 states have call predecessors, (12), 6 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) [2021-10-13 00:46:12,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:46:12,553 INFO L93 Difference]: Finished difference Result 104 states and 111 transitions. [2021-10-13 00:46:12,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-10-13 00:46:12,553 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 3.5) internal successors, (91), 22 states have internal predecessors, (91), 7 states have call successors, (12), 7 states have call predecessors, (12), 6 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) Word has length 64 [2021-10-13 00:46:12,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:46:12,554 INFO L225 Difference]: With dead ends: 104 [2021-10-13 00:46:12,555 INFO L226 Difference]: Without dead ends: 104 [2021-10-13 00:46:12,556 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 979.7ms TimeCoverageRelationStatistics Valid=240, Invalid=1482, Unknown=0, NotChecked=0, Total=1722 [2021-10-13 00:46:12,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-10-13 00:46:12,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 93. [2021-10-13 00:46:12,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 72 states have (on average 1.1666666666666667) internal successors, (84), 80 states have internal predecessors, (84), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:46:12,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 97 transitions. [2021-10-13 00:46:12,560 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 97 transitions. Word has length 64 [2021-10-13 00:46:12,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:46:12,561 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 97 transitions. [2021-10-13 00:46:12,561 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 3.5) internal successors, (91), 22 states have internal predecessors, (91), 7 states have call successors, (12), 7 states have call predecessors, (12), 6 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) [2021-10-13 00:46:12,561 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 97 transitions. [2021-10-13 00:46:12,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-10-13 00:46:12,562 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:46:12,562 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:46:12,602 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-10-13 00:46:12,782 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-10-13 00:46:12,782 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting sll_remove_lastErr2REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:46:12,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:46:12,783 INFO L82 PathProgramCache]: Analyzing trace with hash 505357104, now seen corresponding path program 1 times [2021-10-13 00:46:12,783 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:46:12,783 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388838361] [2021-10-13 00:46:12,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:46:12,783 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:46:12,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:12,901 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:46:12,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:12,923 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:46:12,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:13,031 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:46:13,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:13,036 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:46:13,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:13,122 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-10-13 00:46:13,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:14,036 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-13 00:46:14,037 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:46:14,037 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388838361] [2021-10-13 00:46:14,037 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [388838361] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:46:14,037 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016655296] [2021-10-13 00:46:14,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:46:14,037 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:46:14,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:46:14,038 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:46:14,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-10-13 00:46:14,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:46:14,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 78 conjunts are in the unsatisfiable core [2021-10-13 00:46:14,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:46:15,037 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 [2021-10-13 00:46:20,348 INFO L354 Elim1Store]: treesize reduction 76, result has 28.3 percent of original size [2021-10-13 00:46:20,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 65 treesize of output 65 [2021-10-13 00:46:20,365 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-10-13 00:46:20,366 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 72 treesize of output 74 [2021-10-13 00:46:20,973 INFO L354 Elim1Store]: treesize reduction 39, result has 17.0 percent of original size [2021-10-13 00:46:20,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 67 treesize of output 44 [2021-10-13 00:46:21,040 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 3 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:46:21,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1016655296] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:46:21,040 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:46:21,040 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 59 [2021-10-13 00:46:21,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607506429] [2021-10-13 00:46:21,041 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-10-13 00:46:21,041 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:46:21,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-10-13 00:46:21,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=3384, Unknown=1, NotChecked=0, Total=3540 [2021-10-13 00:46:21,043 INFO L87 Difference]: Start difference. First operand 93 states and 97 transitions. Second operand has 60 states, 57 states have (on average 1.8070175438596492) internal successors, (103), 49 states have internal predecessors, (103), 8 states have call successors, (12), 7 states have call predecessors, (12), 8 states have return successors, (9), 8 states have call predecessors, (9), 6 states have call successors, (9) [2021-10-13 00:47:49,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:47:49,649 INFO L93 Difference]: Finished difference Result 143 states and 152 transitions. [2021-10-13 00:47:49,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-10-13 00:47:49,649 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 57 states have (on average 1.8070175438596492) internal successors, (103), 49 states have internal predecessors, (103), 8 states have call successors, (12), 7 states have call predecessors, (12), 8 states have return successors, (9), 8 states have call predecessors, (9), 6 states have call successors, (9) Word has length 65 [2021-10-13 00:47:49,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:47:49,651 INFO L225 Difference]: With dead ends: 143 [2021-10-13 00:47:49,651 INFO L226 Difference]: Without dead ends: 143 [2021-10-13 00:47:49,657 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2516 ImplicationChecksByTransitivity, 58377.9ms TimeCoverageRelationStatistics Valid=1223, Invalid=12090, Unknown=27, NotChecked=0, Total=13340 [2021-10-13 00:47:49,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-10-13 00:47:49,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 97. [2021-10-13 00:47:49,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 75 states have (on average 1.1733333333333333) internal successors, (88), 83 states have internal predecessors, (88), 8 states have call successors, (8), 7 states have call predecessors, (8), 5 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-10-13 00:47:49,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 103 transitions. [2021-10-13 00:47:49,662 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 103 transitions. Word has length 65 [2021-10-13 00:47:49,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:47:49,663 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 103 transitions. [2021-10-13 00:47:49,663 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 57 states have (on average 1.8070175438596492) internal successors, (103), 49 states have internal predecessors, (103), 8 states have call successors, (12), 7 states have call predecessors, (12), 8 states have return successors, (9), 8 states have call predecessors, (9), 6 states have call successors, (9) [2021-10-13 00:47:49,664 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 103 transitions. [2021-10-13 00:47:49,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-10-13 00:47:49,664 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:47:49,665 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:47:49,712 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-10-13 00:47:49,888 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:47:49,888 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting sll_remove_lastErr3REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:47:49,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:47:49,888 INFO L82 PathProgramCache]: Analyzing trace with hash 505357105, now seen corresponding path program 1 times [2021-10-13 00:47:49,888 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:47:49,889 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [658255852] [2021-10-13 00:47:49,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:47:49,889 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:47:49,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:47:50,073 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:47:50,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:47:50,127 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:47:50,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:47:50,257 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-13 00:47:50,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:47:50,262 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-13 00:47:50,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:47:50,369 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-10-13 00:47:50,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:47:50,594 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-13 00:47:50,594 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:47:50,594 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [658255852] [2021-10-13 00:47:50,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [658255852] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:47:50,595 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [959924661] [2021-10-13 00:47:50,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:47:50,595 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:47:50,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:47:50,596 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:47:50,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-10-13 00:47:51,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:47:51,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 68 conjunts are in the unsatisfiable core [2021-10-13 00:47:51,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:47:51,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 24 [2021-10-13 00:47:51,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 16 [2021-10-13 00:48:25,721 INFO L354 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2021-10-13 00:48:25,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 56 [2021-10-13 00:48:25,732 INFO L354 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2021-10-13 00:48:25,732 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 66 treesize of output 57 [2021-10-13 00:48:26,058 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-10-13 00:48:26,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 72 treesize of output 49 [2021-10-13 00:48:26,063 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-10-13 00:48:26,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 22 [2021-10-13 00:48:26,110 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-13 00:48:26,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [959924661] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:48:26,111 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:48:26,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 42 [2021-10-13 00:48:26,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717958997] [2021-10-13 00:48:26,111 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-10-13 00:48:26,111 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:48:26,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-10-13 00:48:26,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1665, Unknown=25, NotChecked=0, Total=1806 [2021-10-13 00:48:26,113 INFO L87 Difference]: Start difference. First operand 97 states and 103 transitions. Second operand has 43 states, 40 states have (on average 2.325) internal successors, (93), 33 states have internal predecessors, (93), 7 states have call successors, (11), 7 states have call predecessors, (11), 7 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) [2021-10-13 00:50:21,312 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 101 [2021-10-13 00:50:21,312 WARN L228 Executor]: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) stderr output: (error "out of memory") [2021-10-13 00:50:21,339 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-10-13 00:50:21,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:50:21,514 FATAL L? ?]: An unrecoverable error occured during an interaction with an SMT solver: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.convertIOException(Executor.java:312) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.input(Executor.java:158) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.pop(Scriptor.java:139) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.arrays.DiffWrapperScript.pop(DiffWrapperScript.java:99) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.pop(WrapperScript.java:153) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.scripttransfer.HistoryRecordingScript.pop(HistoryRecordingScript.java:117) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.pop(ManagedScript.java:128) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.unAssertPostcondition(IncrementalHoareTripleChecker.java:662) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.clearAssertionStack(IncrementalHoareTripleChecker.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.releaseLock(IncrementalHoareTripleChecker.java:281) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ProtectiveHoareTripleChecker.releaseLock(ProtectiveHoareTripleChecker.java:93) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.EfficientHoareTripleChecker.releaseLock(EfficientHoareTripleChecker.java:162) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.CachingHoareTripleChecker.releaseLock(CachingHoareTripleChecker.java:201) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.switchToReadonlyMode(AbstractInterpolantAutomaton.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.computeAutomataDifference(BasicCegarLoop.java:881) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.refineAbstraction(BasicCegarLoop.java:778) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.refineAbstractionInternal(AbstractCegarLoop.java:462) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:420) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:53) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:392) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) Caused by: java.io.IOException: Stream closed at java.base/java.lang.ProcessBuilder$NullOutputStream.write(ProcessBuilder.java:442) at java.base/java.io.OutputStream.write(OutputStream.java:157) at java.base/java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:81) at java.base/java.io.BufferedOutputStream.flush(BufferedOutputStream.java:142) at java.base/sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:318) at java.base/sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:153) at java.base/java.io.OutputStreamWriter.flush(OutputStreamWriter.java:251) at java.base/java.io.BufferedWriter.flush(BufferedWriter.java:257) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.input(Executor.java:156) ... 35 more [2021-10-13 00:50:21,529 INFO L168 Benchmark]: Toolchain (without parser) took 304895.42 ms. Allocated memory was 96.5 MB in the beginning and 272.6 MB in the end (delta: 176.2 MB). Free memory was 61.4 MB in the beginning and 113.9 MB in the end (delta: -52.5 MB). Peak memory consumption was 122.2 MB. Max. memory is 16.1 GB. [2021-10-13 00:50:21,530 INFO L168 Benchmark]: CDTParser took 0.30 ms. Allocated memory is still 96.5 MB. Free memory is still 49.6 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 00:50:21,531 INFO L168 Benchmark]: CACSL2BoogieTranslator took 519.99 ms. Allocated memory was 96.5 MB in the beginning and 125.8 MB in the end (delta: 29.4 MB). Free memory was 61.2 MB in the beginning and 93.1 MB in the end (delta: -31.9 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2021-10-13 00:50:21,532 INFO L168 Benchmark]: Boogie Preprocessor took 123.46 ms. Allocated memory is still 125.8 MB. Free memory was 93.1 MB in the beginning and 90.1 MB in the end (delta: 2.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 00:50:21,532 INFO L168 Benchmark]: RCFGBuilder took 809.42 ms. Allocated memory is still 125.8 MB. Free memory was 90.1 MB in the beginning and 67.0 MB in the end (delta: 23.1 MB). Peak memory consumption was 23.1 MB. Max. memory is 16.1 GB. [2021-10-13 00:50:21,533 INFO L168 Benchmark]: TraceAbstraction took 303428.85 ms. Allocated memory was 125.8 MB in the beginning and 272.6 MB in the end (delta: 146.8 MB). Free memory was 66.5 MB in the beginning and 113.9 MB in the end (delta: -47.4 MB). Peak memory consumption was 101.9 MB. Max. memory is 16.1 GB. [2021-10-13 00:50:21,534 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30 ms. Allocated memory is still 96.5 MB. Free memory is still 49.6 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 519.99 ms. Allocated memory was 96.5 MB in the beginning and 125.8 MB in the end (delta: 29.4 MB). Free memory was 61.2 MB in the beginning and 93.1 MB in the end (delta: -31.9 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 123.46 ms. Allocated memory is still 125.8 MB. Free memory was 93.1 MB in the beginning and 90.1 MB in the end (delta: 2.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 809.42 ms. Allocated memory is still 125.8 MB. Free memory was 90.1 MB in the beginning and 67.0 MB in the end (delta: 23.1 MB). Peak memory consumption was 23.1 MB. Max. memory is 16.1 GB. * TraceAbstraction took 303428.85 ms. Allocated memory was 125.8 MB in the beginning and 272.6 MB in the end (delta: 146.8 MB). Free memory was 66.5 MB in the beginning and 113.9 MB in the end (delta: -47.4 MB). Peak memory consumption was 101.9 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken: de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.convertIOException(Executor.java:312) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... ### Bit-precise run ### This is Ultimate 0.2.1-dev-4e77c04 [2021-10-13 00:50:24,032 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 00:50:24,034 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 00:50:24,070 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 00:50:24,071 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 00:50:24,072 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 00:50:24,074 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 00:50:24,077 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 00:50:24,080 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 00:50:24,081 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 00:50:24,082 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 00:50:24,084 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 00:50:24,085 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 00:50:24,086 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 00:50:24,088 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 00:50:24,090 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 00:50:24,091 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 00:50:24,092 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 00:50:24,095 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 00:50:24,098 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 00:50:24,100 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 00:50:24,102 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 00:50:24,104 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 00:50:24,105 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 00:50:24,109 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 00:50:24,110 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 00:50:24,111 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 00:50:24,112 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 00:50:24,113 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 00:50:24,114 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 00:50:24,115 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 00:50:24,116 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 00:50:24,117 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 00:50:24,118 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 00:50:24,119 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 00:50:24,120 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 00:50:24,121 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 00:50:24,121 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 00:50:24,122 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 00:50:24,123 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 00:50:24,124 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 00:50:24,125 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf [2021-10-13 00:50:24,155 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 00:50:24,155 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 00:50:24,156 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-10-13 00:50:24,156 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-10-13 00:50:24,157 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-13 00:50:24,157 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-13 00:50:24,158 INFO L138 SettingsManager]: * Use SBE=true [2021-10-13 00:50:24,158 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 00:50:24,158 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 00:50:24,158 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-10-13 00:50:24,159 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-13 00:50:24,159 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 00:50:24,159 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 00:50:24,159 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-10-13 00:50:24,160 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-10-13 00:50:24,160 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-10-13 00:50:24,160 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 00:50:24,160 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 00:50:24,161 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-10-13 00:50:24,161 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-10-13 00:50:24,161 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 00:50:24,161 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 00:50:24,162 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 00:50:24,162 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-13 00:50:24,162 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 00:50:24,162 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 00:50:24,163 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 00:50:24,163 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 00:50:24,163 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-10-13 00:50:24,163 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-10-13 00:50:24,164 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 00:50:24,164 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-13 00:50:24,164 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 661240919dc6588bede452a002e2db53a892483c [2021-10-13 00:50:24,611 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 00:50:24,645 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 00:50:24,650 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 00:50:24,651 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 00:50:24,652 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 00:50:24,653 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i [2021-10-13 00:50:24,741 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/data/891bd98b9/a2de9c0e9214446b9a3ac5db442680ed/FLAG9028919ac [2021-10-13 00:50:25,489 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 00:50:25,490 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i [2021-10-13 00:50:25,509 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/data/891bd98b9/a2de9c0e9214446b9a3ac5db442680ed/FLAG9028919ac [2021-10-13 00:50:25,769 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/data/891bd98b9/a2de9c0e9214446b9a3ac5db442680ed [2021-10-13 00:50:25,772 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 00:50:25,775 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-10-13 00:50:25,777 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 00:50:25,791 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 00:50:25,795 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 00:50:25,795 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 12:50:25" (1/1) ... [2021-10-13 00:50:25,797 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@278fd867 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:50:25, skipping insertion in model container [2021-10-13 00:50:25,797 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 12:50:25" (1/1) ... [2021-10-13 00:50:25,806 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 00:50:25,874 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 00:50:26,199 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_27d4e2d4-89ac-48c6-a75f-16d7874079ce/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i[24038,24051] [2021-10-13 00:50:26,202 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 00:50:26,215 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 00:50:26,302 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_27d4e2d4-89ac-48c6-a75f-16d7874079ce/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i[24038,24051] [2021-10-13 00:50:26,303 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 00:50:26,338 INFO L208 MainTranslator]: Completed translation [2021-10-13 00:50:26,338 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:50:26 WrapperNode [2021-10-13 00:50:26,339 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 00:50:26,340 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 00:50:26,340 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 00:50:26,340 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 00:50:26,352 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:50:26" (1/1) ... [2021-10-13 00:50:26,352 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:50:26" (1/1) ... [2021-10-13 00:50:26,371 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:50:26" (1/1) ... [2021-10-13 00:50:26,371 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:50:26" (1/1) ... [2021-10-13 00:50:26,408 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:50:26" (1/1) ... [2021-10-13 00:50:26,414 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:50:26" (1/1) ... [2021-10-13 00:50:26,421 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:50:26" (1/1) ... [2021-10-13 00:50:26,429 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 00:50:26,430 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 00:50:26,430 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 00:50:26,430 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 00:50:26,431 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:50:26" (1/1) ... [2021-10-13 00:50:26,459 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 00:50:26,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:50:26,485 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 00:50:26,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 00:50:26,527 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-10-13 00:50:26,528 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 00:50:26,528 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.setCurrentRoundingMode [2021-10-13 00:50:26,528 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-10-13 00:50:26,528 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-10-13 00:50:26,529 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-10-13 00:50:26,529 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2021-10-13 00:50:26,529 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-10-13 00:50:26,529 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_create [2021-10-13 00:50:26,529 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_remove_last [2021-10-13 00:50:26,530 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-10-13 00:50:26,530 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-10-13 00:50:26,530 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-10-13 00:50:26,530 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-10-13 00:50:26,530 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-10-13 00:50:26,531 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-10-13 00:50:26,531 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 00:50:26,531 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-10-13 00:50:26,531 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-10-13 00:50:26,531 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-10-13 00:50:26,532 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-10-13 00:50:26,532 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-10-13 00:50:26,532 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-10-13 00:50:26,532 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-10-13 00:50:26,532 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-10-13 00:50:26,532 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-10-13 00:50:26,533 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-10-13 00:50:26,533 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-10-13 00:50:26,533 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-10-13 00:50:26,533 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-10-13 00:50:26,533 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-10-13 00:50:26,533 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-10-13 00:50:26,534 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-10-13 00:50:26,534 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-10-13 00:50:26,534 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-10-13 00:50:26,534 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-10-13 00:50:26,534 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-10-13 00:50:26,535 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-10-13 00:50:26,535 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-10-13 00:50:26,535 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-10-13 00:50:26,535 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-10-13 00:50:26,535 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-10-13 00:50:26,535 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-10-13 00:50:26,536 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-10-13 00:50:26,536 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-10-13 00:50:26,536 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-10-13 00:50:26,536 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-10-13 00:50:26,536 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-10-13 00:50:26,537 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-10-13 00:50:26,537 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-10-13 00:50:26,537 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-10-13 00:50:26,537 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-10-13 00:50:26,537 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-10-13 00:50:26,537 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-10-13 00:50:26,538 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-10-13 00:50:26,538 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-10-13 00:50:26,538 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-10-13 00:50:26,538 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-10-13 00:50:26,538 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-10-13 00:50:26,539 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-10-13 00:50:26,539 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-10-13 00:50:26,539 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-10-13 00:50:26,539 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-10-13 00:50:26,539 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-10-13 00:50:26,539 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-10-13 00:50:26,540 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-10-13 00:50:26,540 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-10-13 00:50:26,540 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-10-13 00:50:26,540 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-10-13 00:50:26,540 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-10-13 00:50:26,541 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-10-13 00:50:26,541 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-10-13 00:50:26,541 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-10-13 00:50:26,541 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2021-10-13 00:50:26,541 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-10-13 00:50:26,542 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-10-13 00:50:26,542 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-10-13 00:50:26,542 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-10-13 00:50:26,542 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-10-13 00:50:26,542 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-10-13 00:50:26,543 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-10-13 00:50:26,543 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-10-13 00:50:26,543 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-10-13 00:50:26,543 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-10-13 00:50:26,543 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-10-13 00:50:26,543 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-10-13 00:50:26,544 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-10-13 00:50:26,544 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-10-13 00:50:26,544 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-10-13 00:50:26,544 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-10-13 00:50:26,544 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-10-13 00:50:26,545 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-10-13 00:50:26,545 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-10-13 00:50:26,545 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-10-13 00:50:26,545 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-10-13 00:50:26,545 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-10-13 00:50:26,546 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-10-13 00:50:26,546 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-10-13 00:50:26,546 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-10-13 00:50:26,546 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-10-13 00:50:26,546 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-10-13 00:50:26,546 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-10-13 00:50:26,547 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-10-13 00:50:26,547 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-10-13 00:50:26,547 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-10-13 00:50:26,547 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-10-13 00:50:26,547 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-10-13 00:50:26,548 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-10-13 00:50:26,548 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-10-13 00:50:26,548 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-10-13 00:50:26,548 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-10-13 00:50:26,548 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-10-13 00:50:26,549 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-10-13 00:50:26,549 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-10-13 00:50:26,549 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-10-13 00:50:26,549 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-10-13 00:50:26,549 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-10-13 00:50:26,549 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-10-13 00:50:26,550 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-10-13 00:50:26,550 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-10-13 00:50:26,550 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-10-13 00:50:26,550 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2021-10-13 00:50:26,550 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-10-13 00:50:26,551 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-10-13 00:50:26,551 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-10-13 00:50:26,551 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-10-13 00:50:26,551 INFO L130 BoogieDeclarations]: Found specification of procedure sll_create [2021-10-13 00:50:26,551 INFO L130 BoogieDeclarations]: Found specification of procedure sll_remove_last [2021-10-13 00:50:26,552 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-10-13 00:50:26,552 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-13 00:50:26,552 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-10-13 00:50:26,552 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-10-13 00:50:26,552 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-10-13 00:50:26,553 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-10-13 00:50:26,553 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 00:50:26,553 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.setCurrentRoundingMode [2021-10-13 00:50:26,553 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2021-10-13 00:50:26,553 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-10-13 00:50:26,554 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-10-13 00:50:26,985 INFO L758 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2021-10-13 00:50:27,512 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 00:50:27,512 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-10-13 00:50:27,516 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 12:50:27 BoogieIcfgContainer [2021-10-13 00:50:27,516 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 00:50:27,520 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 00:50:27,520 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 00:50:27,524 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 00:50:27,525 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 12:50:25" (1/3) ... [2021-10-13 00:50:27,526 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37d8c9c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 12:50:27, skipping insertion in model container [2021-10-13 00:50:27,526 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:50:26" (2/3) ... [2021-10-13 00:50:27,527 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37d8c9c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 12:50:27, skipping insertion in model container [2021-10-13 00:50:27,527 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 12:50:27" (3/3) ... [2021-10-13 00:50:27,529 INFO L111 eAbstractionObserver]: Analyzing ICFG sll2n_remove_all_reverse.i [2021-10-13 00:50:27,536 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 00:50:27,537 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 32 error locations. [2021-10-13 00:50:27,611 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 00:50:27,623 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, mConcurrency=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 [2021-10-13 00:50:27,623 INFO L340 AbstractCegarLoop]: Starting to check reachability of 32 error locations. [2021-10-13 00:50:27,648 INFO L276 IsEmpty]: Start isEmpty. Operand has 91 states, 47 states have (on average 1.872340425531915) internal successors, (88), 79 states have internal predecessors, (88), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:50:27,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-10-13 00:50:27,658 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:50:27,659 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:50:27,659 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:50:27,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:50:27,666 INFO L82 PathProgramCache]: Analyzing trace with hash 1415165422, now seen corresponding path program 1 times [2021-10-13 00:50:27,681 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:50:27,682 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1455861958] [2021-10-13 00:50:27,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:50:27,683 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:50:27,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:50:27,687 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:50:27,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-10-13 00:50:27,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:50:27,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 2 conjunts are in the unsatisfiable core [2021-10-13 00:50:27,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:50:28,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:50:28,078 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:50:28,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:50:28,141 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:50:28,142 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:50:28,142 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1455861958] [2021-10-13 00:50:28,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1455861958] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 00:50:28,144 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:50:28,144 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-10-13 00:50:28,146 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719071716] [2021-10-13 00:50:28,152 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-13 00:50:28,152 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:50:28,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-13 00:50:28,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 00:50:28,170 INFO L87 Difference]: Start difference. First operand has 91 states, 47 states have (on average 1.872340425531915) internal successors, (88), 79 states have internal predecessors, (88), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 2 states have (on average 4.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:50:28,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:50:28,358 INFO L93 Difference]: Finished difference Result 89 states and 93 transitions. [2021-10-13 00:50:28,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-13 00:50:28,360 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-10-13 00:50:28,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:50:28,370 INFO L225 Difference]: With dead ends: 89 [2021-10-13 00:50:28,371 INFO L226 Difference]: Without dead ends: 83 [2021-10-13 00:50:28,372 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 00:50:28,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-10-13 00:50:28,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-10-13 00:50:28,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 44 states have (on average 1.75) internal successors, (77), 73 states have internal predecessors, (77), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-13 00:50:28,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2021-10-13 00:50:28,433 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 13 [2021-10-13 00:50:28,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:50:28,433 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2021-10-13 00:50:28,433 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:50:28,434 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2021-10-13 00:50:28,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-10-13 00:50:28,434 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:50:28,435 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:50:28,452 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-10-13 00:50:28,647 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:50:28,647 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:50:28,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:50:28,648 INFO L82 PathProgramCache]: Analyzing trace with hash 1415165423, now seen corresponding path program 1 times [2021-10-13 00:50:28,649 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:50:28,650 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [74122510] [2021-10-13 00:50:28,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:50:28,650 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:50:28,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:50:28,653 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:50:28,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-10-13 00:50:28,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:50:28,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-13 00:50:28,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:50:28,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:50:28,940 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:50:28,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:50:29,056 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:50:29,057 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:50:29,057 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [74122510] [2021-10-13 00:50:29,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [74122510] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 00:50:29,058 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:50:29,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 3 [2021-10-13 00:50:29,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135070626] [2021-10-13 00:50:29,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 00:50:29,060 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:50:29,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 00:50:29,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-10-13 00:50:29,061 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:50:29,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:50:29,302 INFO L93 Difference]: Finished difference Result 81 states and 84 transitions. [2021-10-13 00:50:29,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-13 00:50:29,308 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-10-13 00:50:29,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:50:29,309 INFO L225 Difference]: With dead ends: 81 [2021-10-13 00:50:29,310 INFO L226 Difference]: Without dead ends: 81 [2021-10-13 00:50:29,310 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 31.4ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-10-13 00:50:29,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-10-13 00:50:29,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2021-10-13 00:50:29,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 71 states have internal predecessors, (75), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-13 00:50:29,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2021-10-13 00:50:29,321 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 13 [2021-10-13 00:50:29,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:50:29,322 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2021-10-13 00:50:29,322 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:50:29,322 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2021-10-13 00:50:29,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-10-13 00:50:29,323 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:50:29,324 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:50:29,334 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-10-13 00:50:29,529 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:50:29,533 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:50:29,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:50:29,534 INFO L82 PathProgramCache]: Analyzing trace with hash 2080136995, now seen corresponding path program 1 times [2021-10-13 00:50:29,534 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:50:29,535 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1693517212] [2021-10-13 00:50:29,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:50:29,535 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:50:29,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:50:29,537 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:50:29,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-10-13 00:50:29,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:50:29,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 00:50:29,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:50:29,773 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:50:29,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:50:29,951 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:50:29,951 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:50:29,952 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1693517212] [2021-10-13 00:50:29,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1693517212] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 00:50:29,952 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:50:29,953 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 7 [2021-10-13 00:50:29,953 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494228393] [2021-10-13 00:50:29,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-13 00:50:29,956 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:50:29,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-13 00:50:29,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-10-13 00:50:29,967 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand has 7 states, 5 states have (on average 2.6) internal successors, (13), 7 states have internal predecessors, (13), 3 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-13 00:50:30,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:50:30,054 INFO L93 Difference]: Finished difference Result 92 states and 96 transitions. [2021-10-13 00:50:30,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-13 00:50:30,055 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 7 states have internal predecessors, (13), 3 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 15 [2021-10-13 00:50:30,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:50:30,062 INFO L225 Difference]: With dead ends: 92 [2021-10-13 00:50:30,062 INFO L226 Difference]: Without dead ends: 89 [2021-10-13 00:50:30,064 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 51.5ms TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-10-13 00:50:30,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-10-13 00:50:30,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 82. [2021-10-13 00:50:30,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 45 states have (on average 1.6888888888888889) internal successors, (76), 72 states have internal predecessors, (76), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-13 00:50:30,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 85 transitions. [2021-10-13 00:50:30,087 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 85 transitions. Word has length 15 [2021-10-13 00:50:30,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:50:30,087 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 85 transitions. [2021-10-13 00:50:30,088 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 7 states have internal predecessors, (13), 3 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-13 00:50:30,088 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 85 transitions. [2021-10-13 00:50:30,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-10-13 00:50:30,089 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:50:30,089 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:50:30,106 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-10-13 00:50:30,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:50:30,303 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting sll_createErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:50:30,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:50:30,303 INFO L82 PathProgramCache]: Analyzing trace with hash 679181970, now seen corresponding path program 1 times [2021-10-13 00:50:30,304 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:50:30,304 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1959741411] [2021-10-13 00:50:30,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:50:30,305 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:50:30,305 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:50:30,306 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:50:30,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-10-13 00:50:30,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:50:30,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-13 00:50:30,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:50:30,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:50:30,588 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:50:30,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:50:30,719 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:50:30,719 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:50:30,720 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1959741411] [2021-10-13 00:50:30,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1959741411] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 00:50:30,720 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:50:30,720 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 5 [2021-10-13 00:50:30,720 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615082946] [2021-10-13 00:50:30,721 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 00:50:30,721 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:50:30,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 00:50:30,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-10-13 00:50:30,722 INFO L87 Difference]: Start difference. First operand 82 states and 85 transitions. Second operand has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:50:31,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:50:31,092 INFO L93 Difference]: Finished difference Result 82 states and 86 transitions. [2021-10-13 00:50:31,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-13 00:50:31,093 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2021-10-13 00:50:31,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:50:31,096 INFO L225 Difference]: With dead ends: 82 [2021-10-13 00:50:31,096 INFO L226 Difference]: Without dead ends: 82 [2021-10-13 00:50:31,096 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 29 SyntacticMatches, 4 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 58.3ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-10-13 00:50:31,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-10-13 00:50:31,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2021-10-13 00:50:31,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 45 states have (on average 1.6666666666666667) internal successors, (75), 71 states have internal predecessors, (75), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-13 00:50:31,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2021-10-13 00:50:31,104 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 19 [2021-10-13 00:50:31,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:50:31,105 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2021-10-13 00:50:31,105 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:50:31,105 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2021-10-13 00:50:31,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-10-13 00:50:31,106 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:50:31,106 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:50:31,124 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-10-13 00:50:31,318 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:50:31,319 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting sll_createErr1REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:50:31,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:50:31,319 INFO L82 PathProgramCache]: Analyzing trace with hash 679181971, now seen corresponding path program 1 times [2021-10-13 00:50:31,320 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:50:31,320 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1020888127] [2021-10-13 00:50:31,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:50:31,320 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:50:31,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:50:31,321 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:50:31,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-10-13 00:50:31,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:50:31,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 9 conjunts are in the unsatisfiable core [2021-10-13 00:50:31,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:50:31,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:50:31,702 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:50:31,702 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:50:32,147 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:50:32,147 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:50:32,147 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1020888127] [2021-10-13 00:50:32,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1020888127] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 00:50:32,148 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:50:32,148 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 9 [2021-10-13 00:50:32,148 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354551687] [2021-10-13 00:50:32,149 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-13 00:50:32,149 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:50:32,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-13 00:50:32,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-10-13 00:50:32,150 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 1 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:50:32,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:50:32,878 INFO L93 Difference]: Finished difference Result 81 states and 85 transitions. [2021-10-13 00:50:32,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-13 00:50:32,882 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 1 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) Word has length 19 [2021-10-13 00:50:32,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:50:32,883 INFO L225 Difference]: With dead ends: 81 [2021-10-13 00:50:32,883 INFO L226 Difference]: Without dead ends: 81 [2021-10-13 00:50:32,884 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 269.0ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-10-13 00:50:32,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-10-13 00:50:32,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2021-10-13 00:50:32,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 45 states have (on average 1.6444444444444444) internal successors, (74), 70 states have internal predecessors, (74), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-13 00:50:32,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 83 transitions. [2021-10-13 00:50:32,892 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 83 transitions. Word has length 19 [2021-10-13 00:50:32,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:50:32,892 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 83 transitions. [2021-10-13 00:50:32,893 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 1 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:50:32,893 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 83 transitions. [2021-10-13 00:50:32,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-10-13 00:50:32,894 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:50:32,894 INFO L512 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] [2021-10-13 00:50:32,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-10-13 00:50:33,100 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:50:33,101 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:50:33,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:50:33,101 INFO L82 PathProgramCache]: Analyzing trace with hash -720483645, now seen corresponding path program 1 times [2021-10-13 00:50:33,102 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:50:33,102 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [78569101] [2021-10-13 00:50:33,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:50:33,102 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:50:33,102 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:50:33,103 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:50:33,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-10-13 00:50:33,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:50:33,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-13 00:50:33,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:50:33,454 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:50:33,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:50:33,760 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:50:33,761 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:50:33,761 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [78569101] [2021-10-13 00:50:33,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [78569101] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 00:50:33,761 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:50:33,762 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2021-10-13 00:50:33,762 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099475499] [2021-10-13 00:50:33,762 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-13 00:50:33,763 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:50:33,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-13 00:50:33,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-10-13 00:50:33,764 INFO L87 Difference]: Start difference. First operand 80 states and 83 transitions. Second operand has 9 states, 7 states have (on average 4.142857142857143) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (6), 1 states have call predecessors, (6), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:50:33,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:50:33,901 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2021-10-13 00:50:33,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 00:50:33,903 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 4.142857142857143) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (6), 1 states have call predecessors, (6), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) Word has length 28 [2021-10-13 00:50:33,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:50:33,904 INFO L225 Difference]: With dead ends: 94 [2021-10-13 00:50:33,904 INFO L226 Difference]: Without dead ends: 91 [2021-10-13 00:50:33,904 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 165.2ms TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-10-13 00:50:33,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-10-13 00:50:33,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 86. [2021-10-13 00:50:33,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 50 states have (on average 1.58) internal successors, (79), 75 states have internal predecessors, (79), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:50:33,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 90 transitions. [2021-10-13 00:50:33,912 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 90 transitions. Word has length 28 [2021-10-13 00:50:33,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:50:33,913 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 90 transitions. [2021-10-13 00:50:33,913 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 4.142857142857143) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (6), 1 states have call predecessors, (6), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:50:33,913 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 90 transitions. [2021-10-13 00:50:33,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-10-13 00:50:33,915 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:50:33,915 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:50:33,935 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-10-13 00:50:34,130 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:50:34,130 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:50:34,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:50:34,131 INFO L82 PathProgramCache]: Analyzing trace with hash 1112556323, now seen corresponding path program 2 times [2021-10-13 00:50:34,131 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:50:34,131 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1624064820] [2021-10-13 00:50:34,131 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 00:50:34,131 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:50:34,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:50:34,132 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:50:34,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-10-13 00:50:34,316 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-10-13 00:50:34,316 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 00:50:34,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-13 00:50:34,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:50:34,435 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-13 00:50:34,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:50:34,568 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-13 00:50:34,568 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:50:34,569 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1624064820] [2021-10-13 00:50:34,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1624064820] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 00:50:34,569 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:50:34,569 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-10-13 00:50:34,569 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414931467] [2021-10-13 00:50:34,570 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 00:50:34,570 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:50:34,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 00:50:34,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-10-13 00:50:34,571 INFO L87 Difference]: Start difference. First operand 86 states and 90 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-10-13 00:50:34,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:50:34,607 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2021-10-13 00:50:34,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 00:50:34,608 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 41 [2021-10-13 00:50:34,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:50:34,609 INFO L225 Difference]: With dead ends: 90 [2021-10-13 00:50:34,609 INFO L226 Difference]: Without dead ends: 90 [2021-10-13 00:50:34,609 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 34.7ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-10-13 00:50:34,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-10-13 00:50:34,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2021-10-13 00:50:34,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 53 states have (on average 1.5471698113207548) internal successors, (82), 78 states have internal predecessors, (82), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:50:34,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 95 transitions. [2021-10-13 00:50:34,618 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 95 transitions. Word has length 41 [2021-10-13 00:50:34,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:50:34,618 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 95 transitions. [2021-10-13 00:50:34,619 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-10-13 00:50:34,619 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 95 transitions. [2021-10-13 00:50:34,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-10-13 00:50:34,620 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:50:34,621 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:50:34,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-10-13 00:50:34,833 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:50:34,834 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting sll_remove_lastErr0REQUIRES_VIOLATION === [sll_createErr0REQUIRES_VIOLATION, sll_createErr1REQUIRES_VIOLATION, node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION (and 28 more)] === [2021-10-13 00:50:34,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:50:34,834 INFO L82 PathProgramCache]: Analyzing trace with hash -280090477, now seen corresponding path program 1 times [2021-10-13 00:50:34,835 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:50:34,835 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [970794925] [2021-10-13 00:50:34,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:50:34,835 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:50:34,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:50:34,836 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:50:34,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-10-13 00:50:35,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:50:35,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 15 conjunts are in the unsatisfiable core [2021-10-13 00:50:35,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:50:35,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:50:35,811 INFO L354 Elim1Store]: treesize reduction 42, result has 33.3 percent of original size [2021-10-13 00:50:35,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 25 treesize of output 37 [2021-10-13 00:50:36,095 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:50:36,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:51:01,315 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 00:51:01,315 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 105 treesize of output 145 [2021-10-13 00:51:01,815 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:51:01,815 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [970794925] [2021-10-13 00:51:01,816 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: No corresponding IProgramVar for v_node_create_~temp~0.base_54 [2021-10-13 00:51:01,816 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1332857344] [2021-10-13 00:51:01,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:51:01,816 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 00:51:01,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/cvc4 [2021-10-13 00:51:01,820 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 00:51:01,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-10-13 00:51:02,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:51:02,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 21 conjunts are in the unsatisfiable core [2021-10-13 00:51:02,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:51:02,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:51:02,515 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 16 treesize of output 14 [2021-10-13 00:51:32,147 INFO L354 Elim1Store]: treesize reduction 39, result has 29.1 percent of original size [2021-10-13 00:51:32,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 34 treesize of output 43 [2021-10-13 00:51:33,274 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-13 00:51:33,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:51:46,333 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 00:51:46,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 116 treesize of output 120 [2021-10-13 00:51:47,801 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: No corresponding IProgramVar for |v_sll_create_#t~ret7.base_53| [2021-10-13 00:51:47,801 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1029761212] [2021-10-13 00:51:47,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:51:47,801 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:51:47,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:51:47,802 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:51:47,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-10-13 00:51:48,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:51:48,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 16 conjunts are in the unsatisfiable core [2021-10-13 00:51:48,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:51:48,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:51:53,189 INFO L354 Elim1Store]: treesize reduction 42, result has 33.3 percent of original size [2021-10-13 00:51:53,190 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 27 treesize of output 39 [2021-10-13 00:51:53,478 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:51:53,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:53:26,105 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 00:53:26,106 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 104 treesize of output 144 [2021-10-13 00:53:26,608 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: No corresponding IProgramVar for v_node_create_~temp~0.base_83 [2021-10-13 00:53:26,608 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:53:26,608 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [] total 0 [2021-10-13 00:53:26,608 ERROR L172 FreeRefinementEngine]: Strategy WOLF failed to provide any proof altough trace is infeasible [2021-10-13 00:53:26,609 INFO L626 BasicCegarLoop]: Counterexample might be feasible [2021-10-13 00:53:26,615 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr0REQUIRES_VIOLATION [2021-10-13 00:53:26,617 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_createErr0REQUIRES_VIOLATION [2021-10-13 00:53:26,618 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_createErr1REQUIRES_VIOLATION [2021-10-13 00:53:26,618 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location node_createErr0REQUIRES_VIOLATION [2021-10-13 00:53:26,618 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location node_createErr1REQUIRES_VIOLATION [2021-10-13 00:53:26,618 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location node_createErr2REQUIRES_VIOLATION [2021-10-13 00:53:26,618 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location node_createErr3REQUIRES_VIOLATION [2021-10-13 00:53:26,619 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr0REQUIRES_VIOLATION [2021-10-13 00:53:26,619 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr1REQUIRES_VIOLATION [2021-10-13 00:53:26,619 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr2ASSERT_VIOLATIONMEMORY_LEAK [2021-10-13 00:53:26,619 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr3ENSURES_VIOLATIONMEMORY_LEAK [2021-10-13 00:53:26,619 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr1REQUIRES_VIOLATION [2021-10-13 00:53:26,619 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr2REQUIRES_VIOLATION [2021-10-13 00:53:26,620 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr3REQUIRES_VIOLATION [2021-10-13 00:53:26,620 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr4REQUIRES_VIOLATION [2021-10-13 00:53:26,620 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr5REQUIRES_VIOLATION [2021-10-13 00:53:26,620 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr6ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 00:53:26,620 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr7ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 00:53:26,620 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr8ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 00:53:26,620 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr9REQUIRES_VIOLATION [2021-10-13 00:53:26,620 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr10REQUIRES_VIOLATION [2021-10-13 00:53:26,620 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr11REQUIRES_VIOLATION [2021-10-13 00:53:26,621 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr12REQUIRES_VIOLATION [2021-10-13 00:53:26,621 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr13REQUIRES_VIOLATION [2021-10-13 00:53:26,621 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr14REQUIRES_VIOLATION [2021-10-13 00:53:26,621 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr15REQUIRES_VIOLATION [2021-10-13 00:53:26,621 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr16REQUIRES_VIOLATION [2021-10-13 00:53:26,621 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr17REQUIRES_VIOLATION [2021-10-13 00:53:26,621 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr18REQUIRES_VIOLATION [2021-10-13 00:53:26,621 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr19ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 00:53:26,622 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr20ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 00:53:26,622 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location sll_remove_lastErr21ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 00:53:26,633 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-10-13 00:53:26,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-10-13 00:53:27,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-10-13 00:53:27,228 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/cvc4 --incremental --print-success --lang smt,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:53:27,233 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-13 00:53:27,256 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 13.10 12:53:27 BoogieIcfgContainer [2021-10-13 00:53:27,256 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-13 00:53:27,257 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-13 00:53:27,257 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-13 00:53:27,257 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-13 00:53:27,258 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 12:50:27" (3/4) ... [2021-10-13 00:53:27,261 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-10-13 00:53:27,261 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-13 00:53:27,262 INFO L168 Benchmark]: Toolchain (without parser) took 181486.36 ms. Allocated memory was 60.8 MB in the beginning and 98.6 MB in the end (delta: 37.7 MB). Free memory was 39.3 MB in the beginning and 42.6 MB in the end (delta: -3.3 MB). Peak memory consumption was 36.2 MB. Max. memory is 16.1 GB. [2021-10-13 00:53:27,262 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 60.8 MB. Free memory is still 41.9 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 00:53:27,263 INFO L168 Benchmark]: CACSL2BoogieTranslator took 561.98 ms. Allocated memory is still 60.8 MB. Free memory was 39.1 MB in the beginning and 39.9 MB in the end (delta: -882.2 kB). Peak memory consumption was 19.5 MB. Max. memory is 16.1 GB. [2021-10-13 00:53:27,263 INFO L168 Benchmark]: Boogie Preprocessor took 89.68 ms. Allocated memory is still 60.8 MB. Free memory was 39.7 MB in the beginning and 36.8 MB in the end (delta: 3.0 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-10-13 00:53:27,264 INFO L168 Benchmark]: RCFGBuilder took 1086.38 ms. Allocated memory was 60.8 MB in the beginning and 81.8 MB in the end (delta: 21.0 MB). Free memory was 36.6 MB in the beginning and 49.1 MB in the end (delta: -12.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-10-13 00:53:27,264 INFO L168 Benchmark]: TraceAbstraction took 179736.61 ms. Allocated memory was 81.8 MB in the beginning and 98.6 MB in the end (delta: 16.8 MB). Free memory was 48.5 MB in the beginning and 42.6 MB in the end (delta: 5.9 MB). Peak memory consumption was 46.0 MB. Max. memory is 16.1 GB. [2021-10-13 00:53:27,264 INFO L168 Benchmark]: Witness Printer took 4.00 ms. Allocated memory is still 98.6 MB. Free memory is still 42.6 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 00:53:27,266 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 60.8 MB. Free memory is still 41.9 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 561.98 ms. Allocated memory is still 60.8 MB. Free memory was 39.1 MB in the beginning and 39.9 MB in the end (delta: -882.2 kB). Peak memory consumption was 19.5 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 89.68 ms. Allocated memory is still 60.8 MB. Free memory was 39.7 MB in the beginning and 36.8 MB in the end (delta: 3.0 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * RCFGBuilder took 1086.38 ms. Allocated memory was 60.8 MB in the beginning and 81.8 MB in the end (delta: 21.0 MB). Free memory was 36.6 MB in the beginning and 49.1 MB in the end (delta: -12.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 179736.61 ms. Allocated memory was 81.8 MB in the beginning and 98.6 MB in the end (delta: 16.8 MB). Free memory was 48.5 MB in the beginning and 42.6 MB in the end (delta: 5.9 MB). Peak memory consumption was 46.0 MB. Max. memory is 16.1 GB. * Witness Printer took 4.00 ms. Allocated memory is still 98.6 MB. Free memory is still 42.6 MB. There was no memory consumed. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - UnprovableResult [Line: 593]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L608] const int len = 2; [L609] const int data = 1; [L610] SLL s = sll_create(len, data); [L610] CALL, EXPR sll_create(len, data) [L584] SLL head = ((void *)0); [L585] COND TRUE len > 0 [L586] CALL, EXPR node_create(data) [L575] SLL temp = (SLL) malloc(sizeof(struct node)); [L576] COND FALSE !(((void *)0) == temp) [L579] temp->next = ((void *)0) [L580] temp->data = data [L581] return temp; [L586] RET, EXPR node_create(data) [L586] SLL new_head = node_create(data); [L587] new_head->next = head [L588] head = new_head [L585] len-- [L585] COND TRUE len > 0 [L586] CALL, EXPR node_create(data) [L575] SLL temp = (SLL) malloc(sizeof(struct node)); [L576] COND FALSE !(((void *)0) == temp) [L579] temp->next = ((void *)0) [L580] temp->data = data [L581] return temp; [L586] RET, EXPR node_create(data) [L586] SLL new_head = node_create(data); [L587] new_head->next = head [L588] head = new_head [L585] len-- [L585] COND FALSE !(len > 0) [L590] return head; [L610] RET, EXPR sll_create(len, data) [L610] SLL s = sll_create(len, data); [L611] int i; [L612] i = len - 1 [L612] COND TRUE i >= 0 [L613] CALL sll_remove_last(&s) [L593] \read(*head) - UnprovableResult [Line: 587]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 587]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 579]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 579]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 580]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 580]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 615]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 615]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 619]: Unable to prove that all allocated memory was freed Unable to prove that all allocated memory was freed Reason: Not analyzed. - UnprovableResult [Line: 607]: Unable to prove that all allocated memory was freed Unable to prove that all allocated memory was freed Reason: Not analyzed. - UnprovableResult [Line: 593]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 593]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 593]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 594]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 594]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 594]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 594]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 594]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 595]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 595]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 598]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 598]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 599]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 599]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 601]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 601]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 603]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 603]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 604]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 604]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 604]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - StatisticsResult: Ultimate Automizer benchmark data CFG has 11 procedures, 107 locations, 32 error locations. Started 1 CEGAR loops. OverallTime: 179623.9ms, OverallIterations: 8, TraceHistogramMax: 2, EmptinessCheckTime: 23.5ms, AutomataDifference: 1867.6ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 19.1ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 567 SDtfs, 136 SDslu, 1360 SDs, 0 SdLazy, 446 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1326.8ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 296 GetRequests, 254 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 616.7ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=91occurred in iteration=0, InterpolantAutomatonStates: 37, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 109.8ms AutomataMinimizationTime, 7 MinimizatonAttempts, 14 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 125.2ms SsaConstructionTime, 247.5ms SatisfiabilityAnalysisTime, 2291.0ms InterpolantComputationTime, 148 NumberOfCodeBlocks, 122 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 282 ConstructedInterpolants, 0 QuantifiedInterpolants, 836 SizeOfPredicates, 9 NumberOfNonLiveVariables, 728 ConjunctsInSsa, 31 ConjunctsInUnsatCore, 14 InterpolantComputations, 12 PerfectInterpolantSequences, 30/32 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces [2021-10-13 00:53:27,337 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27d4e2d4-89ac-48c6-a75f-16d7874079ce/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...