./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memcleanup.prp --file ../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (memcleanup) Using default analysis Version dbf71c69 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/config/svcomp-MemCleanup-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-memcleanup) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash f8d14145608efc0a8f321a178564faff63399ecbab28641c0c2971fec318068f --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-dbf71c6-m [2022-10-17 10:55:18,331 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-10-17 10:55:18,334 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-10-17 10:55:18,378 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-10-17 10:55:18,379 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-10-17 10:55:18,381 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-10-17 10:55:18,383 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-10-17 10:55:18,386 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-10-17 10:55:18,389 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-10-17 10:55:18,391 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-10-17 10:55:18,392 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-10-17 10:55:18,394 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-10-17 10:55:18,395 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-10-17 10:55:18,397 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-10-17 10:55:18,399 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-10-17 10:55:18,401 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-10-17 10:55:18,402 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-10-17 10:55:18,403 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-10-17 10:55:18,406 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-10-17 10:55:18,410 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-10-17 10:55:18,412 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-10-17 10:55:18,422 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-10-17 10:55:18,427 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-10-17 10:55:18,429 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-10-17 10:55:18,442 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-10-17 10:55:18,447 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-10-17 10:55:18,448 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-10-17 10:55:18,450 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-10-17 10:55:18,451 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-10-17 10:55:18,453 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-10-17 10:55:18,454 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-10-17 10:55:18,456 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-10-17 10:55:18,462 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-10-17 10:55:18,463 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-10-17 10:55:18,464 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-10-17 10:55:18,464 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-10-17 10:55:18,465 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-10-17 10:55:18,466 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-10-17 10:55:18,466 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-10-17 10:55:18,467 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-10-17 10:55:18,468 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-10-17 10:55:18,469 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/config/svcomp-MemCleanup-32bit-Automizer_Default.epf [2022-10-17 10:55:18,502 INFO L113 SettingsManager]: Loading preferences was successful [2022-10-17 10:55:18,503 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-10-17 10:55:18,503 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-10-17 10:55:18,504 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-10-17 10:55:18,504 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-10-17 10:55:18,505 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-10-17 10:55:18,506 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-10-17 10:55:18,506 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-10-17 10:55:18,506 INFO L138 SettingsManager]: * Use SBE=true [2022-10-17 10:55:18,507 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-10-17 10:55:18,507 INFO L138 SettingsManager]: * sizeof long=4 [2022-10-17 10:55:18,507 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-10-17 10:55:18,508 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-10-17 10:55:18,508 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-10-17 10:55:18,508 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-10-17 10:55:18,508 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-10-17 10:55:18,509 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-10-17 10:55:18,509 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-10-17 10:55:18,509 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-10-17 10:55:18,510 INFO L138 SettingsManager]: * sizeof long double=12 [2022-10-17 10:55:18,510 INFO L138 SettingsManager]: * Use constant arrays=true [2022-10-17 10:55:18,510 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-10-17 10:55:18,511 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-10-17 10:55:18,511 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-10-17 10:55:18,511 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 10:55:18,512 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-10-17 10:55:18,512 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-10-17 10:55:18,512 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-10-17 10:55:18,512 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-10-17 10:55:18,513 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_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f8d14145608efc0a8f321a178564faff63399ecbab28641c0c2971fec318068f [2022-10-17 10:55:18,794 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-10-17 10:55:18,819 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-10-17 10:55:18,822 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-10-17 10:55:18,824 INFO L271 PluginConnector]: Initializing CDTParser... [2022-10-17 10:55:18,825 INFO L275 PluginConnector]: CDTParser initialized [2022-10-17 10:55:18,840 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i [2022-10-17 10:55:18,929 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/data/b1658ff10/54b06c070c5643dba17bca921e2c80ad/FLAG7978a2e43 [2022-10-17 10:55:19,573 INFO L306 CDTParser]: Found 1 translation units. [2022-10-17 10:55:19,574 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i [2022-10-17 10:55:19,606 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/data/b1658ff10/54b06c070c5643dba17bca921e2c80ad/FLAG7978a2e43 [2022-10-17 10:55:19,760 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/data/b1658ff10/54b06c070c5643dba17bca921e2c80ad [2022-10-17 10:55:19,778 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-10-17 10:55:19,780 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-10-17 10:55:19,783 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-10-17 10:55:19,783 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-10-17 10:55:19,789 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-10-17 10:55:19,790 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 10:55:19" (1/1) ... [2022-10-17 10:55:19,792 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@78d4cd2b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:55:19, skipping insertion in model container [2022-10-17 10:55:19,793 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 10:55:19" (1/1) ... [2022-10-17 10:55:19,801 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-10-17 10:55:19,880 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-10-17 10:55:20,270 WARN L230 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_5633094f-3227-4f21-b68d-e3c18c55193a/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i[22636,22649] [2022-10-17 10:55:20,342 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 10:55:20,358 INFO L203 MainTranslator]: Completed pre-run [2022-10-17 10:55:20,424 WARN L230 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_5633094f-3227-4f21-b68d-e3c18c55193a/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i[22636,22649] [2022-10-17 10:55:20,462 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 10:55:20,503 INFO L208 MainTranslator]: Completed translation [2022-10-17 10:55:20,503 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:55:20 WrapperNode [2022-10-17 10:55:20,504 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-10-17 10:55:20,505 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-10-17 10:55:20,505 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-10-17 10:55:20,505 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-10-17 10:55:20,514 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:55:20" (1/1) ... [2022-10-17 10:55:20,534 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:55:20" (1/1) ... [2022-10-17 10:55:20,571 INFO L138 Inliner]: procedures = 129, calls = 79, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 203 [2022-10-17 10:55:20,572 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-10-17 10:55:20,573 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-10-17 10:55:20,573 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-10-17 10:55:20,573 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-10-17 10:55:20,584 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:55:20" (1/1) ... [2022-10-17 10:55:20,584 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:55:20" (1/1) ... [2022-10-17 10:55:20,591 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:55:20" (1/1) ... [2022-10-17 10:55:20,592 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:55:20" (1/1) ... [2022-10-17 10:55:20,613 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:55:20" (1/1) ... [2022-10-17 10:55:20,632 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:55:20" (1/1) ... [2022-10-17 10:55:20,636 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:55:20" (1/1) ... [2022-10-17 10:55:20,647 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:55:20" (1/1) ... [2022-10-17 10:55:20,659 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-10-17 10:55:20,665 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-10-17 10:55:20,665 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-10-17 10:55:20,665 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-10-17 10:55:20,666 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:55:20" (1/1) ... [2022-10-17 10:55:20,675 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 10:55:20,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/z3 [2022-10-17 10:55:20,720 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-10-17 10:55:20,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-10-17 10:55:20,766 INFO L130 BoogieDeclarations]: Found specification of procedure fail [2022-10-17 10:55:20,766 INFO L138 BoogieDeclarations]: Found implementation of procedure fail [2022-10-17 10:55:20,766 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-10-17 10:55:20,766 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-10-17 10:55:20,766 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-10-17 10:55:20,767 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-10-17 10:55:20,767 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-10-17 10:55:20,767 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_prev [2022-10-17 10:55:20,767 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_prev [2022-10-17 10:55:20,767 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-10-17 10:55:20,767 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2022-10-17 10:55:20,768 INFO L130 BoogieDeclarations]: Found specification of procedure chain_node [2022-10-17 10:55:20,768 INFO L138 BoogieDeclarations]: Found implementation of procedure chain_node [2022-10-17 10:55:20,768 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-10-17 10:55:20,768 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_next [2022-10-17 10:55:20,768 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_next [2022-10-17 10:55:20,768 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-10-17 10:55:20,768 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-10-17 10:55:20,919 INFO L235 CfgBuilder]: Building ICFG [2022-10-17 10:55:20,922 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-10-17 10:55:21,800 INFO L276 CfgBuilder]: Performing block encoding [2022-10-17 10:55:21,817 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-10-17 10:55:21,817 INFO L300 CfgBuilder]: Removed 33 assume(true) statements. [2022-10-17 10:55:21,821 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 10:55:21 BoogieIcfgContainer [2022-10-17 10:55:21,821 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-10-17 10:55:21,826 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-10-17 10:55:21,826 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-10-17 10:55:21,830 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-10-17 10:55:21,831 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.10 10:55:19" (1/3) ... [2022-10-17 10:55:21,832 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d87acc6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 10:55:21, skipping insertion in model container [2022-10-17 10:55:21,832 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:55:20" (2/3) ... [2022-10-17 10:55:21,833 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d87acc6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 10:55:21, skipping insertion in model container [2022-10-17 10:55:21,833 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 10:55:21" (3/3) ... [2022-10-17 10:55:21,835 INFO L112 eAbstractionObserver]: Analyzing ICFG sll_to_dll_rev-1.i [2022-10-17 10:55:21,863 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-10-17 10:55:21,864 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 83 error locations. [2022-10-17 10:55:21,932 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-10-17 10:55:21,939 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@c051383, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-10-17 10:55:21,940 INFO L358 AbstractCegarLoop]: Starting to check reachability of 83 error locations. [2022-10-17 10:55:21,944 INFO L276 IsEmpty]: Start isEmpty. Operand has 223 states, 120 states have (on average 2.1083333333333334) internal successors, (253), 210 states have internal predecessors, (253), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-10-17 10:55:21,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-10-17 10:55:21,952 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 10:55:21,953 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-10-17 10:55:21,953 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-10-17 10:55:21,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 10:55:21,959 INFO L85 PathProgramCache]: Analyzing trace with hash 6220774, now seen corresponding path program 1 times [2022-10-17 10:55:21,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-10-17 10:55:21,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [289737017] [2022-10-17 10:55:21,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 10:55:21,970 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 10:55:22,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:22,158 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 10:55:22,158 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-10-17 10:55:22,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [289737017] [2022-10-17 10:55:22,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [289737017] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 10:55:22,160 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 10:55:22,160 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-10-17 10:55:22,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215354492] [2022-10-17 10:55:22,163 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 10:55:22,168 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-10-17 10:55:22,169 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-10-17 10:55:22,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-10-17 10:55:22,200 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-10-17 10:55:22,204 INFO L87 Difference]: Start difference. First operand has 223 states, 120 states have (on average 2.1083333333333334) internal successors, (253), 210 states have internal predecessors, (253), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Second operand has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 10:55:22,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 10:55:22,244 INFO L93 Difference]: Finished difference Result 221 states and 242 transitions. [2022-10-17 10:55:22,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-10-17 10:55:22,247 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-10-17 10:55:22,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 10:55:22,257 INFO L225 Difference]: With dead ends: 221 [2022-10-17 10:55:22,257 INFO L226 Difference]: Without dead ends: 219 [2022-10-17 10:55:22,259 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-10-17 10:55:22,264 INFO L413 NwaCegarLoop]: 242 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-10-17 10:55:22,265 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 10:55:22,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2022-10-17 10:55:22,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2022-10-17 10:55:22,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 116 states have (on average 1.8448275862068966) internal successors, (214), 206 states have internal predecessors, (214), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-10-17 10:55:22,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 240 transitions. [2022-10-17 10:55:22,333 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 240 transitions. Word has length 4 [2022-10-17 10:55:22,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 10:55:22,333 INFO L495 AbstractCegarLoop]: Abstraction has 219 states and 240 transitions. [2022-10-17 10:55:22,333 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 10:55:22,334 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 240 transitions. [2022-10-17 10:55:22,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-10-17 10:55:22,334 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 10:55:22,334 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-10-17 10:55:22,335 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-10-17 10:55:22,335 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting chain_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-10-17 10:55:22,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 10:55:22,336 INFO L85 PathProgramCache]: Analyzing trace with hash 1692154958, now seen corresponding path program 1 times [2022-10-17 10:55:22,336 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-10-17 10:55:22,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358199802] [2022-10-17 10:55:22,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 10:55:22,337 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 10:55:22,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:22,534 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 10:55:22,534 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-10-17 10:55:22,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [358199802] [2022-10-17 10:55:22,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [358199802] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 10:55:22,535 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 10:55:22,535 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-10-17 10:55:22,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275653854] [2022-10-17 10:55:22,536 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 10:55:22,537 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 10:55:22,538 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-10-17 10:55:22,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 10:55:22,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 10:55:22,539 INFO L87 Difference]: Start difference. First operand 219 states and 240 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 10:55:22,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 10:55:22,758 INFO L93 Difference]: Finished difference Result 217 states and 238 transitions. [2022-10-17 10:55:22,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 10:55:22,759 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-10-17 10:55:22,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 10:55:22,761 INFO L225 Difference]: With dead ends: 217 [2022-10-17 10:55:22,762 INFO L226 Difference]: Without dead ends: 217 [2022-10-17 10:55:22,762 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 10:55:22,764 INFO L413 NwaCegarLoop]: 226 mSDtfsCounter, 17 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 367 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-10-17 10:55:22,765 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 367 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-10-17 10:55:22,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2022-10-17 10:55:22,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 217. [2022-10-17 10:55:22,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 116 states have (on average 1.8275862068965518) internal successors, (212), 204 states have internal predecessors, (212), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-10-17 10:55:22,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 238 transitions. [2022-10-17 10:55:22,786 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 238 transitions. Word has length 6 [2022-10-17 10:55:22,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 10:55:22,787 INFO L495 AbstractCegarLoop]: Abstraction has 217 states and 238 transitions. [2022-10-17 10:55:22,787 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 10:55:22,787 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 238 transitions. [2022-10-17 10:55:22,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-10-17 10:55:22,788 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 10:55:22,788 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-10-17 10:55:22,788 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-10-17 10:55:22,788 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting chain_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-10-17 10:55:22,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 10:55:22,789 INFO L85 PathProgramCache]: Analyzing trace with hash 1692154959, now seen corresponding path program 1 times [2022-10-17 10:55:22,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-10-17 10:55:22,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525847826] [2022-10-17 10:55:22,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 10:55:22,790 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 10:55:22,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:22,975 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 10:55:22,975 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-10-17 10:55:22,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1525847826] [2022-10-17 10:55:22,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1525847826] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 10:55:22,976 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 10:55:22,976 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-10-17 10:55:22,976 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213226723] [2022-10-17 10:55:22,977 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 10:55:22,977 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 10:55:22,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-10-17 10:55:22,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 10:55:22,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 10:55:22,979 INFO L87 Difference]: Start difference. First operand 217 states and 238 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 10:55:23,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 10:55:23,131 INFO L93 Difference]: Finished difference Result 215 states and 236 transitions. [2022-10-17 10:55:23,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 10:55:23,133 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-10-17 10:55:23,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 10:55:23,135 INFO L225 Difference]: With dead ends: 215 [2022-10-17 10:55:23,135 INFO L226 Difference]: Without dead ends: 215 [2022-10-17 10:55:23,137 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 10:55:23,145 INFO L413 NwaCegarLoop]: 226 mSDtfsCounter, 15 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 372 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 10:55:23,147 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 372 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 10:55:23,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2022-10-17 10:55:23,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 215. [2022-10-17 10:55:23,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 116 states have (on average 1.8103448275862069) internal successors, (210), 202 states have internal predecessors, (210), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-10-17 10:55:23,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 236 transitions. [2022-10-17 10:55:23,185 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 236 transitions. Word has length 6 [2022-10-17 10:55:23,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 10:55:23,186 INFO L495 AbstractCegarLoop]: Abstraction has 215 states and 236 transitions. [2022-10-17 10:55:23,186 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 10:55:23,186 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 236 transitions. [2022-10-17 10:55:23,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-10-17 10:55:23,187 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 10:55:23,187 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 10:55:23,187 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-10-17 10:55:23,187 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting chain_nodeErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-10-17 10:55:23,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 10:55:23,188 INFO L85 PathProgramCache]: Analyzing trace with hash -387700622, now seen corresponding path program 1 times [2022-10-17 10:55:23,189 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-10-17 10:55:23,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1348454064] [2022-10-17 10:55:23,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 10:55:23,189 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 10:55:23,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:23,592 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 10:55:23,592 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-10-17 10:55:23,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1348454064] [2022-10-17 10:55:23,593 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1348454064] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 10:55:23,594 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 10:55:23,594 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-10-17 10:55:23,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523799861] [2022-10-17 10:55:23,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 10:55:23,596 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-10-17 10:55:23,596 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-10-17 10:55:23,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-10-17 10:55:23,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-10-17 10:55:23,599 INFO L87 Difference]: Start difference. First operand 215 states and 236 transitions. Second operand has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 10:55:23,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 10:55:23,918 INFO L93 Difference]: Finished difference Result 210 states and 231 transitions. [2022-10-17 10:55:23,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-10-17 10:55:23,919 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-10-17 10:55:23,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 10:55:23,921 INFO L225 Difference]: With dead ends: 210 [2022-10-17 10:55:23,921 INFO L226 Difference]: Without dead ends: 210 [2022-10-17 10:55:23,922 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-10-17 10:55:23,933 INFO L413 NwaCegarLoop]: 208 mSDtfsCounter, 60 mSDsluCounter, 398 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 606 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-10-17 10:55:23,934 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 606 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-10-17 10:55:23,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2022-10-17 10:55:23,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 210. [2022-10-17 10:55:23,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 116 states have (on average 1.7672413793103448) internal successors, (205), 197 states have internal predecessors, (205), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-10-17 10:55:23,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 231 transitions. [2022-10-17 10:55:23,958 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 231 transitions. Word has length 10 [2022-10-17 10:55:23,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 10:55:23,959 INFO L495 AbstractCegarLoop]: Abstraction has 210 states and 231 transitions. [2022-10-17 10:55:23,959 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 10:55:23,960 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 231 transitions. [2022-10-17 10:55:23,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-10-17 10:55:23,961 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 10:55:23,961 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 10:55:23,961 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-10-17 10:55:23,961 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting chain_nodeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-10-17 10:55:23,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 10:55:23,962 INFO L85 PathProgramCache]: Analyzing trace with hash -387700621, now seen corresponding path program 1 times [2022-10-17 10:55:23,963 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-10-17 10:55:23,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [470678112] [2022-10-17 10:55:23,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 10:55:23,963 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 10:55:24,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:24,360 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 10:55:24,360 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-10-17 10:55:24,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [470678112] [2022-10-17 10:55:24,361 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [470678112] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 10:55:24,361 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 10:55:24,361 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-10-17 10:55:24,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341616851] [2022-10-17 10:55:24,364 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 10:55:24,364 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-10-17 10:55:24,365 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-10-17 10:55:24,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-10-17 10:55:24,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-10-17 10:55:24,366 INFO L87 Difference]: Start difference. First operand 210 states and 231 transitions. Second operand has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 10:55:24,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 10:55:24,770 INFO L93 Difference]: Finished difference Result 205 states and 226 transitions. [2022-10-17 10:55:24,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-10-17 10:55:24,771 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-10-17 10:55:24,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 10:55:24,773 INFO L225 Difference]: With dead ends: 205 [2022-10-17 10:55:24,773 INFO L226 Difference]: Without dead ends: 205 [2022-10-17 10:55:24,774 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-10-17 10:55:24,778 INFO L413 NwaCegarLoop]: 205 mSDtfsCounter, 39 mSDsluCounter, 339 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 544 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-10-17 10:55:24,779 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 544 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-10-17 10:55:24,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2022-10-17 10:55:24,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2022-10-17 10:55:24,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 116 states have (on average 1.7241379310344827) internal successors, (200), 192 states have internal predecessors, (200), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-10-17 10:55:24,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 226 transitions. [2022-10-17 10:55:24,799 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 226 transitions. Word has length 10 [2022-10-17 10:55:24,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 10:55:24,799 INFO L495 AbstractCegarLoop]: Abstraction has 205 states and 226 transitions. [2022-10-17 10:55:24,800 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 10:55:24,800 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 226 transitions. [2022-10-17 10:55:24,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-10-17 10:55:24,800 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 10:55:24,801 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 10:55:24,801 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-10-17 10:55:24,801 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting chain_nodeErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-10-17 10:55:24,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 10:55:24,802 INFO L85 PathProgramCache]: Analyzing trace with hash 866182740, now seen corresponding path program 1 times [2022-10-17 10:55:24,802 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-10-17 10:55:24,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1495254550] [2022-10-17 10:55:24,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 10:55:24,802 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 10:55:24,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:24,896 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 10:55:24,896 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-10-17 10:55:24,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1495254550] [2022-10-17 10:55:24,896 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1495254550] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 10:55:24,896 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 10:55:24,897 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-10-17 10:55:24,897 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057674768] [2022-10-17 10:55:24,897 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 10:55:24,897 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-10-17 10:55:24,898 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-10-17 10:55:24,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-10-17 10:55:24,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-10-17 10:55:24,899 INFO L87 Difference]: Start difference. First operand 205 states and 226 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 10:55:25,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 10:55:25,174 INFO L93 Difference]: Finished difference Result 204 states and 225 transitions. [2022-10-17 10:55:25,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-10-17 10:55:25,175 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-10-17 10:55:25,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 10:55:25,178 INFO L225 Difference]: With dead ends: 204 [2022-10-17 10:55:25,178 INFO L226 Difference]: Without dead ends: 204 [2022-10-17 10:55:25,178 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-10-17 10:55:25,181 INFO L413 NwaCegarLoop]: 216 mSDtfsCounter, 21 mSDsluCounter, 414 mSDsCounter, 0 mSdLazyCounter, 243 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 630 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-10-17 10:55:25,181 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 630 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 243 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-10-17 10:55:25,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2022-10-17 10:55:25,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 204. [2022-10-17 10:55:25,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 116 states have (on average 1.7155172413793103) internal successors, (199), 191 states have internal predecessors, (199), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-10-17 10:55:25,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 225 transitions. [2022-10-17 10:55:25,193 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 225 transitions. Word has length 11 [2022-10-17 10:55:25,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 10:55:25,193 INFO L495 AbstractCegarLoop]: Abstraction has 204 states and 225 transitions. [2022-10-17 10:55:25,193 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 10:55:25,193 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 225 transitions. [2022-10-17 10:55:25,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-10-17 10:55:25,194 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 10:55:25,194 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 10:55:25,194 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-10-17 10:55:25,195 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting chain_nodeErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-10-17 10:55:25,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 10:55:25,196 INFO L85 PathProgramCache]: Analyzing trace with hash 866182741, now seen corresponding path program 1 times [2022-10-17 10:55:25,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-10-17 10:55:25,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1381512358] [2022-10-17 10:55:25,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 10:55:25,196 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 10:55:25,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:25,388 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 10:55:25,388 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-10-17 10:55:25,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1381512358] [2022-10-17 10:55:25,389 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1381512358] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 10:55:25,389 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 10:55:25,389 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-10-17 10:55:25,389 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503722974] [2022-10-17 10:55:25,389 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 10:55:25,390 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-10-17 10:55:25,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-10-17 10:55:25,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-10-17 10:55:25,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-10-17 10:55:25,391 INFO L87 Difference]: Start difference. First operand 204 states and 225 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 10:55:25,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 10:55:25,696 INFO L93 Difference]: Finished difference Result 203 states and 224 transitions. [2022-10-17 10:55:25,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-10-17 10:55:25,697 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-10-17 10:55:25,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 10:55:25,700 INFO L225 Difference]: With dead ends: 203 [2022-10-17 10:55:25,700 INFO L226 Difference]: Without dead ends: 203 [2022-10-17 10:55:25,701 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2022-10-17 10:55:25,702 INFO L413 NwaCegarLoop]: 216 mSDtfsCounter, 20 mSDsluCounter, 642 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 858 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-10-17 10:55:25,703 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 858 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-10-17 10:55:25,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2022-10-17 10:55:25,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 203. [2022-10-17 10:55:25,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 116 states have (on average 1.706896551724138) internal successors, (198), 190 states have internal predecessors, (198), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-10-17 10:55:25,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 224 transitions. [2022-10-17 10:55:25,716 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 224 transitions. Word has length 11 [2022-10-17 10:55:25,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 10:55:25,721 INFO L495 AbstractCegarLoop]: Abstraction has 203 states and 224 transitions. [2022-10-17 10:55:25,721 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 10:55:25,721 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 224 transitions. [2022-10-17 10:55:25,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-10-17 10:55:25,722 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 10:55:25,722 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 10:55:25,722 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-10-17 10:55:25,723 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-10-17 10:55:25,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 10:55:25,723 INFO L85 PathProgramCache]: Analyzing trace with hash -610249734, now seen corresponding path program 1 times [2022-10-17 10:55:25,723 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-10-17 10:55:25,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296375141] [2022-10-17 10:55:25,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 10:55:25,724 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 10:55:25,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:26,042 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-10-17 10:55:26,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:26,207 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 10:55:26,208 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-10-17 10:55:26,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296375141] [2022-10-17 10:55:26,208 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [296375141] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 10:55:26,208 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 10:55:26,209 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-10-17 10:55:26,209 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131690780] [2022-10-17 10:55:26,209 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 10:55:26,210 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-10-17 10:55:26,210 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-10-17 10:55:26,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-10-17 10:55:26,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2022-10-17 10:55:26,211 INFO L87 Difference]: Start difference. First operand 203 states and 224 transitions. Second operand has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-10-17 10:55:26,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 10:55:26,866 INFO L93 Difference]: Finished difference Result 202 states and 223 transitions. [2022-10-17 10:55:26,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-10-17 10:55:26,867 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-10-17 10:55:26,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 10:55:26,869 INFO L225 Difference]: With dead ends: 202 [2022-10-17 10:55:26,870 INFO L226 Difference]: Without dead ends: 202 [2022-10-17 10:55:26,871 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2022-10-17 10:55:26,872 INFO L413 NwaCegarLoop]: 192 mSDtfsCounter, 72 mSDsluCounter, 370 mSDsCounter, 0 mSdLazyCounter, 588 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 562 SdHoareTripleChecker+Invalid, 610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 588 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-10-17 10:55:26,872 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 562 Invalid, 610 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 588 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-10-17 10:55:26,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2022-10-17 10:55:26,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 202. [2022-10-17 10:55:26,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 116 states have (on average 1.6982758620689655) internal successors, (197), 189 states have internal predecessors, (197), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-10-17 10:55:26,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 223 transitions. [2022-10-17 10:55:26,889 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 223 transitions. Word has length 19 [2022-10-17 10:55:26,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 10:55:26,893 INFO L495 AbstractCegarLoop]: Abstraction has 202 states and 223 transitions. [2022-10-17 10:55:26,893 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-10-17 10:55:26,893 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 223 transitions. [2022-10-17 10:55:26,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-10-17 10:55:26,894 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 10:55:26,894 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 10:55:26,894 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-10-17 10:55:26,895 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-10-17 10:55:26,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 10:55:26,896 INFO L85 PathProgramCache]: Analyzing trace with hash -610249733, now seen corresponding path program 1 times [2022-10-17 10:55:26,896 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-10-17 10:55:26,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1983953163] [2022-10-17 10:55:26,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 10:55:26,897 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 10:55:26,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:27,373 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-10-17 10:55:27,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:27,662 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 10:55:27,662 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-10-17 10:55:27,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1983953163] [2022-10-17 10:55:27,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1983953163] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 10:55:27,663 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 10:55:27,663 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-10-17 10:55:27,663 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898179158] [2022-10-17 10:55:27,664 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 10:55:27,664 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-10-17 10:55:27,664 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-10-17 10:55:27,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-10-17 10:55:27,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2022-10-17 10:55:27,666 INFO L87 Difference]: Start difference. First operand 202 states and 223 transitions. Second operand has 7 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-10-17 10:55:28,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 10:55:28,281 INFO L93 Difference]: Finished difference Result 218 states and 245 transitions. [2022-10-17 10:55:28,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-10-17 10:55:28,282 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-10-17 10:55:28,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 10:55:28,286 INFO L225 Difference]: With dead ends: 218 [2022-10-17 10:55:28,286 INFO L226 Difference]: Without dead ends: 218 [2022-10-17 10:55:28,287 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2022-10-17 10:55:28,287 INFO L413 NwaCegarLoop]: 198 mSDtfsCounter, 64 mSDsluCounter, 323 mSDsCounter, 0 mSdLazyCounter, 485 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 521 SdHoareTripleChecker+Invalid, 508 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 485 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-10-17 10:55:28,288 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 521 Invalid, 508 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 485 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-10-17 10:55:28,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2022-10-17 10:55:28,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 207. [2022-10-17 10:55:28,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 120 states have (on average 1.6833333333333333) internal successors, (202), 193 states have internal predecessors, (202), 18 states have call successors, (18), 4 states have call predecessors, (18), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-10-17 10:55:28,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 230 transitions. [2022-10-17 10:55:28,299 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 230 transitions. Word has length 19 [2022-10-17 10:55:28,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 10:55:28,300 INFO L495 AbstractCegarLoop]: Abstraction has 207 states and 230 transitions. [2022-10-17 10:55:28,300 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-10-17 10:55:28,301 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 230 transitions. [2022-10-17 10:55:28,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-10-17 10:55:28,302 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 10:55:28,302 INFO L195 NwaCegarLoop]: 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] [2022-10-17 10:55:28,302 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-10-17 10:55:28,303 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-10-17 10:55:28,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 10:55:28,303 INFO L85 PathProgramCache]: Analyzing trace with hash -1097063055, now seen corresponding path program 1 times [2022-10-17 10:55:28,303 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-10-17 10:55:28,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750413150] [2022-10-17 10:55:28,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 10:55:28,304 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 10:55:28,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:28,811 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-10-17 10:55:28,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:28,951 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 10:55:28,952 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-10-17 10:55:28,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750413150] [2022-10-17 10:55:28,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1750413150] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 10:55:28,952 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 10:55:28,952 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-10-17 10:55:28,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881504505] [2022-10-17 10:55:28,953 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 10:55:28,953 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-10-17 10:55:28,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-10-17 10:55:28,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-10-17 10:55:28,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2022-10-17 10:55:28,955 INFO L87 Difference]: Start difference. First operand 207 states and 230 transitions. Second operand has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-10-17 10:55:29,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 10:55:29,496 INFO L93 Difference]: Finished difference Result 206 states and 229 transitions. [2022-10-17 10:55:29,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-10-17 10:55:29,497 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2022-10-17 10:55:29,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 10:55:29,499 INFO L225 Difference]: With dead ends: 206 [2022-10-17 10:55:29,499 INFO L226 Difference]: Without dead ends: 206 [2022-10-17 10:55:29,500 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2022-10-17 10:55:29,500 INFO L413 NwaCegarLoop]: 192 mSDtfsCounter, 126 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 486 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 509 SdHoareTripleChecker+Invalid, 528 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 486 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-10-17 10:55:29,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [126 Valid, 509 Invalid, 528 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 486 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-10-17 10:55:29,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2022-10-17 10:55:29,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 206. [2022-10-17 10:55:29,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 120 states have (on average 1.675) internal successors, (201), 192 states have internal predecessors, (201), 18 states have call successors, (18), 4 states have call predecessors, (18), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-10-17 10:55:29,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 229 transitions. [2022-10-17 10:55:29,512 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 229 transitions. Word has length 24 [2022-10-17 10:55:29,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 10:55:29,513 INFO L495 AbstractCegarLoop]: Abstraction has 206 states and 229 transitions. [2022-10-17 10:55:29,513 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-10-17 10:55:29,513 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 229 transitions. [2022-10-17 10:55:29,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-10-17 10:55:29,515 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 10:55:29,515 INFO L195 NwaCegarLoop]: 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] [2022-10-17 10:55:29,515 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-10-17 10:55:29,515 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-10-17 10:55:29,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 10:55:29,516 INFO L85 PathProgramCache]: Analyzing trace with hash -1097063054, now seen corresponding path program 1 times [2022-10-17 10:55:29,517 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-10-17 10:55:29,517 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [653987458] [2022-10-17 10:55:29,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 10:55:29,517 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 10:55:29,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:30,015 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-10-17 10:55:30,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:30,167 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 10:55:30,168 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-10-17 10:55:30,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [653987458] [2022-10-17 10:55:30,168 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [653987458] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 10:55:30,168 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 10:55:30,169 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-10-17 10:55:30,169 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415462420] [2022-10-17 10:55:30,169 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 10:55:30,170 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-10-17 10:55:30,170 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-10-17 10:55:30,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-10-17 10:55:30,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2022-10-17 10:55:30,171 INFO L87 Difference]: Start difference. First operand 206 states and 229 transitions. Second operand has 7 states, 5 states have (on average 4.4) internal successors, (22), 6 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-10-17 10:55:30,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 10:55:30,676 INFO L93 Difference]: Finished difference Result 205 states and 228 transitions. [2022-10-17 10:55:30,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-10-17 10:55:30,677 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 4.4) internal successors, (22), 6 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2022-10-17 10:55:30,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 10:55:30,679 INFO L225 Difference]: With dead ends: 205 [2022-10-17 10:55:30,679 INFO L226 Difference]: Without dead ends: 205 [2022-10-17 10:55:30,679 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2022-10-17 10:55:30,680 INFO L413 NwaCegarLoop]: 136 mSDtfsCounter, 184 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 455 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 190 SdHoareTripleChecker+Valid, 361 SdHoareTripleChecker+Invalid, 478 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 455 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-10-17 10:55:30,680 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [190 Valid, 361 Invalid, 478 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 455 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-10-17 10:55:30,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2022-10-17 10:55:30,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2022-10-17 10:55:30,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 120 states have (on average 1.6666666666666667) internal successors, (200), 191 states have internal predecessors, (200), 18 states have call successors, (18), 4 states have call predecessors, (18), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-10-17 10:55:30,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 228 transitions. [2022-10-17 10:55:30,689 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 228 transitions. Word has length 24 [2022-10-17 10:55:30,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 10:55:30,690 INFO L495 AbstractCegarLoop]: Abstraction has 205 states and 228 transitions. [2022-10-17 10:55:30,690 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 4.4) internal successors, (22), 6 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-10-17 10:55:30,691 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 228 transitions. [2022-10-17 10:55:30,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-10-17 10:55:30,692 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 10:55:30,692 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-10-17 10:55:30,693 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-10-17 10:55:30,693 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-10-17 10:55:30,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 10:55:30,694 INFO L85 PathProgramCache]: Analyzing trace with hash 450998278, now seen corresponding path program 1 times [2022-10-17 10:55:30,694 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-10-17 10:55:30,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1183609050] [2022-10-17 10:55:30,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 10:55:30,695 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 10:55:30,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:31,395 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-10-17 10:55:31,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:31,851 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-10-17 10:55:31,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:32,084 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-10-17 10:55:32,084 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-10-17 10:55:32,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1183609050] [2022-10-17 10:55:32,085 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1183609050] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 10:55:32,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [42466412] [2022-10-17 10:55:32,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 10:55:32,086 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 10:55:32,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/z3 [2022-10-17 10:55:32,090 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 10:55:32,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-10-17 10:55:32,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:32,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 24 conjunts are in the unsatisfiable core [2022-10-17 10:55:32,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 10:55:32,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 10:55:32,569 INFO L356 Elim1Store]: treesize reduction 24, result has 33.3 percent of original size [2022-10-17 10:55:32,570 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 23 [2022-10-17 10:55:32,606 INFO L390 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 44 treesize of output 42 [2022-10-17 10:55:32,717 INFO L390 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 5 treesize of output 3 [2022-10-17 10:55:33,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 10:55:33,014 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-10-17 10:55:33,052 INFO L390 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 5 treesize of output 3 [2022-10-17 10:55:33,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 10:55:33,271 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-10-17 10:55:33,318 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-10-17 10:55:33,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 10:55:35,541 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [42466412] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 10:55:35,541 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-10-17 10:55:35,541 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5] total 14 [2022-10-17 10:55:35,542 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166452459] [2022-10-17 10:55:35,542 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-10-17 10:55:35,542 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-10-17 10:55:35,542 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-10-17 10:55:35,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-10-17 10:55:35,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2022-10-17 10:55:35,543 INFO L87 Difference]: Start difference. First operand 205 states and 228 transitions. Second operand has 15 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 13 states have internal predecessors, (48), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2022-10-17 10:55:36,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 10:55:36,253 INFO L93 Difference]: Finished difference Result 223 states and 248 transitions. [2022-10-17 10:55:36,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-10-17 10:55:36,254 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 13 states have internal predecessors, (48), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 34 [2022-10-17 10:55:36,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 10:55:36,256 INFO L225 Difference]: With dead ends: 223 [2022-10-17 10:55:36,256 INFO L226 Difference]: Without dead ends: 223 [2022-10-17 10:55:36,257 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2022-10-17 10:55:36,257 INFO L413 NwaCegarLoop]: 209 mSDtfsCounter, 47 mSDsluCounter, 711 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 920 SdHoareTripleChecker+Invalid, 632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 128 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-10-17 10:55:36,258 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 920 Invalid, 632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 501 Invalid, 0 Unknown, 128 Unchecked, 0.6s Time] [2022-10-17 10:55:36,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2022-10-17 10:55:36,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 211. [2022-10-17 10:55:36,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 127 states have (on average 1.6141732283464567) internal successors, (205), 197 states have internal predecessors, (205), 17 states have call successors, (17), 5 states have call predecessors, (17), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-10-17 10:55:36,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 231 transitions. [2022-10-17 10:55:36,268 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 231 transitions. Word has length 34 [2022-10-17 10:55:36,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 10:55:36,268 INFO L495 AbstractCegarLoop]: Abstraction has 211 states and 231 transitions. [2022-10-17 10:55:36,268 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 13 states have internal predecessors, (48), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2022-10-17 10:55:36,269 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 231 transitions. [2022-10-17 10:55:36,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-10-17 10:55:36,271 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 10:55:36,271 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 10:55:36,324 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-10-17 10:55:36,497 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 10:55:36,498 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-10-17 10:55:36,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 10:55:36,498 INFO L85 PathProgramCache]: Analyzing trace with hash -1428439082, now seen corresponding path program 1 times [2022-10-17 10:55:36,498 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-10-17 10:55:36,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922891980] [2022-10-17 10:55:36,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 10:55:36,499 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 10:55:36,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:36,968 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-10-17 10:55:36,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:36,995 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2022-10-17 10:55:37,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:37,124 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 10:55:37,124 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-10-17 10:55:37,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922891980] [2022-10-17 10:55:37,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922891980] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 10:55:37,125 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 10:55:37,125 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-10-17 10:55:37,125 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205386959] [2022-10-17 10:55:37,125 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 10:55:37,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-10-17 10:55:37,126 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-10-17 10:55:37,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-10-17 10:55:37,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-10-17 10:55:37,127 INFO L87 Difference]: Start difference. First operand 211 states and 231 transitions. Second operand has 8 states, 7 states have (on average 5.857142857142857) internal successors, (41), 7 states have internal predecessors, (41), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 10:55:37,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 10:55:37,651 INFO L93 Difference]: Finished difference Result 216 states and 237 transitions. [2022-10-17 10:55:37,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-10-17 10:55:37,652 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.857142857142857) internal successors, (41), 7 states have internal predecessors, (41), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 45 [2022-10-17 10:55:37,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 10:55:37,654 INFO L225 Difference]: With dead ends: 216 [2022-10-17 10:55:37,654 INFO L226 Difference]: Without dead ends: 216 [2022-10-17 10:55:37,654 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2022-10-17 10:55:37,655 INFO L413 NwaCegarLoop]: 125 mSDtfsCounter, 240 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 480 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 343 SdHoareTripleChecker+Invalid, 528 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-10-17 10:55:37,655 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [246 Valid, 343 Invalid, 528 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 480 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-10-17 10:55:37,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2022-10-17 10:55:37,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 204. [2022-10-17 10:55:37,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 127 states have (on average 1.5590551181102361) internal successors, (198), 190 states have internal predecessors, (198), 17 states have call successors, (17), 5 states have call predecessors, (17), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-10-17 10:55:37,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 224 transitions. [2022-10-17 10:55:37,665 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 224 transitions. Word has length 45 [2022-10-17 10:55:37,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 10:55:37,665 INFO L495 AbstractCegarLoop]: Abstraction has 204 states and 224 transitions. [2022-10-17 10:55:37,666 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.857142857142857) internal successors, (41), 7 states have internal predecessors, (41), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 10:55:37,666 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 224 transitions. [2022-10-17 10:55:37,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-10-17 10:55:37,668 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 10:55:37,668 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 10:55:37,668 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-10-17 10:55:37,669 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-10-17 10:55:37,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 10:55:37,669 INFO L85 PathProgramCache]: Analyzing trace with hash -1428439081, now seen corresponding path program 1 times [2022-10-17 10:55:37,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-10-17 10:55:37,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [377854883] [2022-10-17 10:55:37,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 10:55:37,670 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 10:55:37,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:38,065 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-10-17 10:55:38,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:38,122 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2022-10-17 10:55:38,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:38,255 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 10:55:38,256 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-10-17 10:55:38,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [377854883] [2022-10-17 10:55:38,256 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [377854883] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 10:55:38,257 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 10:55:38,257 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-10-17 10:55:38,257 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84555390] [2022-10-17 10:55:38,257 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 10:55:38,258 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-10-17 10:55:38,258 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-10-17 10:55:38,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-10-17 10:55:38,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-10-17 10:55:38,259 INFO L87 Difference]: Start difference. First operand 204 states and 224 transitions. Second operand has 8 states, 7 states have (on average 5.857142857142857) internal successors, (41), 7 states have internal predecessors, (41), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 10:55:38,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 10:55:38,958 INFO L93 Difference]: Finished difference Result 231 states and 260 transitions. [2022-10-17 10:55:38,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-10-17 10:55:38,959 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.857142857142857) internal successors, (41), 7 states have internal predecessors, (41), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 45 [2022-10-17 10:55:38,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 10:55:38,961 INFO L225 Difference]: With dead ends: 231 [2022-10-17 10:55:38,961 INFO L226 Difference]: Without dead ends: 231 [2022-10-17 10:55:38,962 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2022-10-17 10:55:38,962 INFO L413 NwaCegarLoop]: 111 mSDtfsCounter, 359 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 570 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 361 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 639 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 570 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-10-17 10:55:38,963 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [361 Valid, 279 Invalid, 639 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 570 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-10-17 10:55:38,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2022-10-17 10:55:38,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 206. [2022-10-17 10:55:38,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 134 states have (on average 1.492537313432836) internal successors, (200), 191 states have internal predecessors, (200), 18 states have call successors, (18), 5 states have call predecessors, (18), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-10-17 10:55:38,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 228 transitions. [2022-10-17 10:55:38,975 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 228 transitions. Word has length 45 [2022-10-17 10:55:38,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 10:55:38,976 INFO L495 AbstractCegarLoop]: Abstraction has 206 states and 228 transitions. [2022-10-17 10:55:38,976 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.857142857142857) internal successors, (41), 7 states have internal predecessors, (41), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 10:55:38,976 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 228 transitions. [2022-10-17 10:55:38,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-10-17 10:55:38,982 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 10:55:38,982 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 10:55:38,983 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-10-17 10:55:38,985 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-10-17 10:55:38,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 10:55:38,985 INFO L85 PathProgramCache]: Analyzing trace with hash -1331938361, now seen corresponding path program 1 times [2022-10-17 10:55:38,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-10-17 10:55:38,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1828199796] [2022-10-17 10:55:38,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 10:55:38,986 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 10:55:39,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:39,352 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-10-17 10:55:39,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:39,377 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2022-10-17 10:55:39,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:39,485 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 10:55:39,485 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-10-17 10:55:39,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1828199796] [2022-10-17 10:55:39,485 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1828199796] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 10:55:39,486 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 10:55:39,486 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-10-17 10:55:39,486 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042852743] [2022-10-17 10:55:39,486 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 10:55:39,487 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-10-17 10:55:39,487 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-10-17 10:55:39,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-10-17 10:55:39,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-10-17 10:55:39,488 INFO L87 Difference]: Start difference. First operand 206 states and 228 transitions. Second operand has 8 states, 7 states have (on average 6.0) internal successors, (42), 7 states have internal predecessors, (42), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 10:55:40,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 10:55:40,149 INFO L93 Difference]: Finished difference Result 211 states and 234 transitions. [2022-10-17 10:55:40,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-10-17 10:55:40,150 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 6.0) internal successors, (42), 7 states have internal predecessors, (42), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2022-10-17 10:55:40,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 10:55:40,151 INFO L225 Difference]: With dead ends: 211 [2022-10-17 10:55:40,151 INFO L226 Difference]: Without dead ends: 211 [2022-10-17 10:55:40,152 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2022-10-17 10:55:40,152 INFO L413 NwaCegarLoop]: 119 mSDtfsCounter, 183 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 592 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 437 SdHoareTripleChecker+Invalid, 625 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 592 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-10-17 10:55:40,153 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [189 Valid, 437 Invalid, 625 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 592 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-10-17 10:55:40,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2022-10-17 10:55:40,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 199. [2022-10-17 10:55:40,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 134 states have (on average 1.4402985074626866) internal successors, (193), 184 states have internal predecessors, (193), 18 states have call successors, (18), 5 states have call predecessors, (18), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-10-17 10:55:40,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 221 transitions. [2022-10-17 10:55:40,161 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 221 transitions. Word has length 46 [2022-10-17 10:55:40,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 10:55:40,161 INFO L495 AbstractCegarLoop]: Abstraction has 199 states and 221 transitions. [2022-10-17 10:55:40,161 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 6.0) internal successors, (42), 7 states have internal predecessors, (42), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 10:55:40,162 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 221 transitions. [2022-10-17 10:55:40,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-10-17 10:55:40,162 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 10:55:40,162 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 10:55:40,163 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-10-17 10:55:40,163 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-10-17 10:55:40,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 10:55:40,163 INFO L85 PathProgramCache]: Analyzing trace with hash -1331938360, now seen corresponding path program 1 times [2022-10-17 10:55:40,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-10-17 10:55:40,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1009949733] [2022-10-17 10:55:40,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 10:55:40,164 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 10:55:40,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:40,567 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-10-17 10:55:40,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:40,595 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2022-10-17 10:55:40,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:40,720 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 10:55:40,721 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-10-17 10:55:40,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1009949733] [2022-10-17 10:55:40,721 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1009949733] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 10:55:40,721 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 10:55:40,722 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-10-17 10:55:40,722 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106400986] [2022-10-17 10:55:40,722 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 10:55:40,723 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-10-17 10:55:40,723 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-10-17 10:55:40,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-10-17 10:55:40,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-10-17 10:55:40,724 INFO L87 Difference]: Start difference. First operand 199 states and 221 transitions. Second operand has 8 states, 7 states have (on average 6.0) internal successors, (42), 7 states have internal predecessors, (42), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 10:55:41,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 10:55:41,448 INFO L93 Difference]: Finished difference Result 234 states and 268 transitions. [2022-10-17 10:55:41,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-10-17 10:55:41,449 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 6.0) internal successors, (42), 7 states have internal predecessors, (42), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2022-10-17 10:55:41,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 10:55:41,451 INFO L225 Difference]: With dead ends: 234 [2022-10-17 10:55:41,451 INFO L226 Difference]: Without dead ends: 234 [2022-10-17 10:55:41,451 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2022-10-17 10:55:41,452 INFO L413 NwaCegarLoop]: 112 mSDtfsCounter, 311 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 614 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 313 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 668 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 614 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-10-17 10:55:41,452 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [313 Valid, 333 Invalid, 668 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 614 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-10-17 10:55:41,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2022-10-17 10:55:41,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 207. [2022-10-17 10:55:41,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 147 states have (on average 1.3741496598639455) internal successors, (202), 190 states have internal predecessors, (202), 19 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-10-17 10:55:41,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 232 transitions. [2022-10-17 10:55:41,463 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 232 transitions. Word has length 46 [2022-10-17 10:55:41,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 10:55:41,463 INFO L495 AbstractCegarLoop]: Abstraction has 207 states and 232 transitions. [2022-10-17 10:55:41,463 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 6.0) internal successors, (42), 7 states have internal predecessors, (42), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 10:55:41,464 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 232 transitions. [2022-10-17 10:55:41,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-10-17 10:55:41,464 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 10:55:41,465 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 10:55:41,465 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-10-17 10:55:41,465 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting failErr0ASSERT_VIOLATIONMEMORY_LEAK === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2022-10-17 10:55:41,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 10:55:41,466 INFO L85 PathProgramCache]: Analyzing trace with hash 1810979602, now seen corresponding path program 1 times [2022-10-17 10:55:41,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-10-17 10:55:41,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1281856632] [2022-10-17 10:55:41,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 10:55:41,467 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 10:55:41,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:42,422 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-10-17 10:55:42,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:42,644 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2022-10-17 10:55:42,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:43,483 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 10:55:43,484 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-10-17 10:55:43,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1281856632] [2022-10-17 10:55:43,484 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1281856632] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 10:55:43,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1097520398] [2022-10-17 10:55:43,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 10:55:43,484 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 10:55:43,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/z3 [2022-10-17 10:55:43,489 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 10:55:43,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5633094f-3227-4f21-b68d-e3c18c55193a/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-10-17 10:55:43,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 10:55:43,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 432 conjuncts, 71 conjunts are in the unsatisfiable core [2022-10-17 10:55:43,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 10:55:43,903 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-10-17 10:55:44,070 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-10-17 10:55:44,071 INFO L390 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 15 treesize of output 21 [2022-10-17 10:55:44,081 INFO L390 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 6 treesize of output 4 [2022-10-17 10:55:44,338 INFO L356 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-10-17 10:55:44,338 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 23 [2022-10-17 10:55:44,436 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-10-17 10:55:44,436 INFO L390 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 24 treesize of output 12 [2022-10-17 10:55:44,889 WARN L855 $PredicateComparison]: unable to prove that (exists ((|chain_node_~node~0#1.base| Int) (v_ArrVal_1276 (Array Int Int)) (v_ArrVal_1275 (Array Int Int))) (and (= (store (store |c_old(#memory_$Pointer$.base)| |chain_node_~node~0#1.base| v_ArrVal_1275) |c_chain_node_#in~ppnode#1.base| v_ArrVal_1276) |c_#memory_$Pointer$.base|) (< |chain_node_~node~0#1.base| |c_#StackHeapBarrier|))) is different from true [2022-10-17 10:55:44,917 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 10:55:44,954 INFO L356 Elim1Store]: treesize reduction 20, result has 57.4 percent of original size [2022-10-17 10:55:44,955 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 33 treesize of output 49 [2022-10-17 10:55:44,971 INFO L390 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 24 treesize of output 20 [2022-10-17 10:55:45,084 INFO L390 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 [2022-10-17 10:55:45,221 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 20 [2022-10-17 10:55:45,317 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2022-10-17 10:55:45,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 10:55:45,496 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-10-17 10:55:45,497 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 15 [2022-10-17 10:55:45,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1097520398] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 10:55:45,731 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-10-17 10:55:45,731 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24] total 38 [2022-10-17 10:55:45,731 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846064502] [2022-10-17 10:55:45,731 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-10-17 10:55:45,732 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-10-17 10:55:45,732 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-10-17 10:55:45,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-10-17 10:55:45,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1429, Unknown=19, NotChecked=76, Total=1640 [2022-10-17 10:55:45,734 INFO L87 Difference]: Start difference. First operand 207 states and 232 transitions. Second operand has 38 states, 35 states have (on average 2.1714285714285713) internal successors, (76), 35 states have internal predecessors, (76), 6 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4)