./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/sll2n_append_equal.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/sll2n_append_equal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91 --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash f218eac2d2b52810cb44bb8b3f3f80463ec7e46c8818b20f079ed947cc8e9fd0 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-24 23:56:54,589 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-24 23:56:54,708 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-24 23:56:54,715 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-24 23:56:54,716 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-24 23:56:54,755 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-24 23:56:54,756 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-24 23:56:54,756 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-24 23:56:54,757 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-24 23:56:54,762 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-24 23:56:54,763 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-24 23:56:54,764 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-24 23:56:54,764 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-24 23:56:54,766 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-24 23:56:54,766 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-24 23:56:54,767 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-24 23:56:54,767 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-24 23:56:54,768 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-24 23:56:54,768 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-24 23:56:54,769 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-24 23:56:54,770 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-24 23:56:54,770 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-24 23:56:54,771 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-24 23:56:54,771 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-24 23:56:54,772 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-24 23:56:54,773 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-24 23:56:54,774 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-24 23:56:54,774 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-24 23:56:54,775 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-24 23:56:54,775 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-24 23:56:54,776 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-24 23:56:54,777 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-24 23:56:54,777 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-24 23:56:54,778 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-24 23:56:54,778 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-24 23:56:54,778 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-24 23:56:54,779 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-24 23:56:54,779 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-24 23:56:54,779 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-24 23:56:54,780 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-24 23:56:54,780 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:56:54,780 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-24 23:56:54,781 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-24 23:56:54,781 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-24 23:56:54,782 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-24 23:56:54,782 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-24 23:56:54,782 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-24 23:56:54,783 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-24 23:56:54,783 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f218eac2d2b52810cb44bb8b3f3f80463ec7e46c8818b20f079ed947cc8e9fd0 [2023-11-24 23:56:55,140 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-24 23:56:55,176 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-24 23:56:55,180 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-24 23:56:55,181 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-24 23:56:55,182 INFO L274 PluginConnector]: CDTParser initialized [2023-11-24 23:56:55,183 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/list-simple/sll2n_append_equal.i [2023-11-24 23:56:58,363 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-24 23:56:58,721 INFO L384 CDTParser]: Found 1 translation units. [2023-11-24 23:56:58,725 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/sv-benchmarks/c/list-simple/sll2n_append_equal.i [2023-11-24 23:56:58,739 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/data/2bb319134/594b0d9d3a7341779280636aa4489736/FLAGea1fb3046 [2023-11-24 23:56:58,754 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/data/2bb319134/594b0d9d3a7341779280636aa4489736 [2023-11-24 23:56:58,756 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-24 23:56:58,758 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-24 23:56:58,759 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-24 23:56:58,759 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-24 23:56:58,774 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-24 23:56:58,775 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:56:58" (1/1) ... [2023-11-24 23:56:58,776 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@37f06361 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:58, skipping insertion in model container [2023-11-24 23:56:58,776 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:56:58" (1/1) ... [2023-11-24 23:56:58,837 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-24 23:56:59,227 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:56:59,243 INFO L202 MainTranslator]: Completed pre-run [2023-11-24 23:56:59,289 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:56:59,324 INFO L206 MainTranslator]: Completed translation [2023-11-24 23:56:59,325 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:59 WrapperNode [2023-11-24 23:56:59,325 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-24 23:56:59,326 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-24 23:56:59,327 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-24 23:56:59,327 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-24 23:56:59,335 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:59" (1/1) ... [2023-11-24 23:56:59,357 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:59" (1/1) ... [2023-11-24 23:56:59,397 INFO L138 Inliner]: procedures = 127, calls = 34, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 127 [2023-11-24 23:56:59,398 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-24 23:56:59,399 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-24 23:56:59,399 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-24 23:56:59,399 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-24 23:56:59,415 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:59" (1/1) ... [2023-11-24 23:56:59,415 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:59" (1/1) ... [2023-11-24 23:56:59,440 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:59" (1/1) ... [2023-11-24 23:56:59,440 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:59" (1/1) ... [2023-11-24 23:56:59,448 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:59" (1/1) ... [2023-11-24 23:56:59,452 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:59" (1/1) ... [2023-11-24 23:56:59,454 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:59" (1/1) ... [2023-11-24 23:56:59,456 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:59" (1/1) ... [2023-11-24 23:56:59,460 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-24 23:56:59,461 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-24 23:56:59,461 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-24 23:56:59,462 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-24 23:56:59,462 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:59" (1/1) ... [2023-11-24 23:56:59,468 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:56:59,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:59,499 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-24 23:56:59,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-24 23:56:59,532 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-24 23:56:59,533 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-24 23:56:59,533 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-24 23:56:59,533 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-24 23:56:59,533 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-24 23:56:59,533 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-24 23:56:59,534 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-24 23:56:59,534 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-24 23:56:59,534 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-24 23:56:59,534 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-24 23:56:59,534 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-24 23:56:59,535 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-24 23:56:59,535 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-24 23:56:59,535 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-24 23:56:59,669 INFO L241 CfgBuilder]: Building ICFG [2023-11-24 23:56:59,672 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-24 23:57:00,083 INFO L282 CfgBuilder]: Performing block encoding [2023-11-24 23:57:00,163 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-24 23:57:00,163 INFO L309 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-24 23:57:00,164 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:57:00 BoogieIcfgContainer [2023-11-24 23:57:00,165 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-24 23:57:00,169 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-24 23:57:00,169 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-24 23:57:00,172 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-24 23:57:00,172 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 11:56:58" (1/3) ... [2023-11-24 23:57:00,177 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6419496f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:57:00, skipping insertion in model container [2023-11-24 23:57:00,177 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:59" (2/3) ... [2023-11-24 23:57:00,178 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6419496f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:57:00, skipping insertion in model container [2023-11-24 23:57:00,178 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:57:00" (3/3) ... [2023-11-24 23:57:00,179 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2n_append_equal.i [2023-11-24 23:57:00,199 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-24 23:57:00,199 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 33 error locations. [2023-11-24 23:57:00,240 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-24 23:57:00,246 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;@68c396a7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-24 23:57:00,247 INFO L358 AbstractCegarLoop]: Starting to check reachability of 33 error locations. [2023-11-24 23:57:00,251 INFO L276 IsEmpty]: Start isEmpty. Operand has 73 states, 36 states have (on average 2.1944444444444446) internal successors, (79), 69 states have internal predecessors, (79), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:57:00,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-24 23:57:00,259 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:57:00,259 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-24 23:57:00,260 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 30 more)] === [2023-11-24 23:57:00,265 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:57:00,266 INFO L85 PathProgramCache]: Analyzing trace with hash 1573405085, now seen corresponding path program 1 times [2023-11-24 23:57:00,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:57:00,276 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1701368103] [2023-11-24 23:57:00,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:00,277 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:57:00,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:00,612 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:57:00,612 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:57:00,613 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1701368103] [2023-11-24 23:57:00,614 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1701368103] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:57:00,614 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:57:00,614 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-24 23:57:00,616 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073685810] [2023-11-24 23:57:00,617 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:57:00,623 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:57:00,623 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:57:00,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:57:00,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:57:00,666 INFO L87 Difference]: Start difference. First operand has 73 states, 36 states have (on average 2.1944444444444446) internal successors, (79), 69 states have internal predecessors, (79), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 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) [2023-11-24 23:57:00,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:57:00,738 INFO L93 Difference]: Finished difference Result 78 states and 86 transitions. [2023-11-24 23:57:00,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:57:00,741 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 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 [2023-11-24 23:57:00,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:57:00,750 INFO L225 Difference]: With dead ends: 78 [2023-11-24 23:57:00,750 INFO L226 Difference]: Without dead ends: 76 [2023-11-24 23:57:00,752 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 [2023-11-24 23:57:00,756 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 4 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:57:00,757 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 128 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:57:00,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-11-24 23:57:00,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 71. [2023-11-24 23:57:00,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 35 states have (on average 2.085714285714286) internal successors, (73), 67 states have internal predecessors, (73), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:57:00,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 77 transitions. [2023-11-24 23:57:00,802 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 77 transitions. Word has length 6 [2023-11-24 23:57:00,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:57:00,803 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 77 transitions. [2023-11-24 23:57:00,803 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 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) [2023-11-24 23:57:00,804 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 77 transitions. [2023-11-24 23:57:00,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-24 23:57:00,804 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:57:00,804 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-24 23:57:00,805 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-24 23:57:00,805 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 30 more)] === [2023-11-24 23:57:00,806 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:57:00,806 INFO L85 PathProgramCache]: Analyzing trace with hash 1416346933, now seen corresponding path program 1 times [2023-11-24 23:57:00,807 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:57:00,807 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1540040249] [2023-11-24 23:57:00,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:00,807 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:57:00,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:00,911 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:57:00,912 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:57:00,912 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1540040249] [2023-11-24 23:57:00,912 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1540040249] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:57:00,913 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:57:00,913 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-24 23:57:00,913 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548202362] [2023-11-24 23:57:00,913 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:57:00,915 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:57:00,915 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:57:00,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:57:00,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:57:00,917 INFO L87 Difference]: Start difference. First operand 71 states and 77 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) [2023-11-24 23:57:01,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:57:01,009 INFO L93 Difference]: Finished difference Result 69 states and 75 transitions. [2023-11-24 23:57:01,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:57:01,010 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 [2023-11-24 23:57:01,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:57:01,011 INFO L225 Difference]: With dead ends: 69 [2023-11-24 23:57:01,011 INFO L226 Difference]: Without dead ends: 69 [2023-11-24 23:57:01,012 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 [2023-11-24 23:57:01,014 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 4 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:57:01,015 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 92 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:57:01,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2023-11-24 23:57:01,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2023-11-24 23:57:01,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 35 states have (on average 2.0285714285714285) internal successors, (71), 65 states have internal predecessors, (71), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:57:01,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 75 transitions. [2023-11-24 23:57:01,025 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 75 transitions. Word has length 6 [2023-11-24 23:57:01,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:57:01,025 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 75 transitions. [2023-11-24 23:57:01,026 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) [2023-11-24 23:57:01,026 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 75 transitions. [2023-11-24 23:57:01,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-24 23:57:01,026 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:57:01,027 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-24 23:57:01,027 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-24 23:57:01,027 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting node_createErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 30 more)] === [2023-11-24 23:57:01,028 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:57:01,028 INFO L85 PathProgramCache]: Analyzing trace with hash 1416346934, now seen corresponding path program 1 times [2023-11-24 23:57:01,028 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:57:01,029 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1808130694] [2023-11-24 23:57:01,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:01,029 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:57:01,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:01,148 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:57:01,148 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:57:01,148 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1808130694] [2023-11-24 23:57:01,149 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1808130694] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:57:01,149 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:57:01,149 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-24 23:57:01,149 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084496633] [2023-11-24 23:57:01,150 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:57:01,150 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:57:01,150 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:57:01,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:57:01,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:57:01,152 INFO L87 Difference]: Start difference. First operand 69 states and 75 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) [2023-11-24 23:57:01,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:57:01,231 INFO L93 Difference]: Finished difference Result 67 states and 73 transitions. [2023-11-24 23:57:01,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:57:01,232 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 [2023-11-24 23:57:01,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:57:01,233 INFO L225 Difference]: With dead ends: 67 [2023-11-24 23:57:01,234 INFO L226 Difference]: Without dead ends: 67 [2023-11-24 23:57:01,234 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 [2023-11-24 23:57:01,236 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 2 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:57:01,236 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 95 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:57:01,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2023-11-24 23:57:01,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2023-11-24 23:57:01,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 35 states have (on average 1.9714285714285715) internal successors, (69), 63 states have internal predecessors, (69), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:57:01,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 73 transitions. [2023-11-24 23:57:01,249 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 73 transitions. Word has length 6 [2023-11-24 23:57:01,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:57:01,249 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 73 transitions. [2023-11-24 23:57:01,250 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) [2023-11-24 23:57:01,250 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 73 transitions. [2023-11-24 23:57:01,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-24 23:57:01,251 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:57:01,251 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:57:01,251 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-24 23:57:01,251 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 30 more)] === [2023-11-24 23:57:01,252 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:57:01,252 INFO L85 PathProgramCache]: Analyzing trace with hash -1854644570, now seen corresponding path program 1 times [2023-11-24 23:57:01,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:57:01,253 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1688633831] [2023-11-24 23:57:01,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:01,253 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:57:01,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:01,408 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:57:01,409 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:57:01,409 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1688633831] [2023-11-24 23:57:01,409 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1688633831] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:57:01,410 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:57:01,410 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-24 23:57:01,410 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875192569] [2023-11-24 23:57:01,410 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:57:01,411 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-24 23:57:01,411 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:57:01,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-24 23:57:01,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:57:01,413 INFO L87 Difference]: Start difference. First operand 67 states and 73 transitions. Second operand has 6 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 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) [2023-11-24 23:57:01,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:57:01,594 INFO L93 Difference]: Finished difference Result 67 states and 74 transitions. [2023-11-24 23:57:01,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:57:01,595 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 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 10 [2023-11-24 23:57:01,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:57:01,597 INFO L225 Difference]: With dead ends: 67 [2023-11-24 23:57:01,597 INFO L226 Difference]: Without dead ends: 67 [2023-11-24 23:57:01,598 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-24 23:57:01,599 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 5 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:57:01,600 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 192 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:57:01,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2023-11-24 23:57:01,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2023-11-24 23:57:01,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 35 states have (on average 1.9428571428571428) internal successors, (68), 62 states have internal predecessors, (68), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:57:01,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 72 transitions. [2023-11-24 23:57:01,608 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 72 transitions. Word has length 10 [2023-11-24 23:57:01,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:57:01,608 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 72 transitions. [2023-11-24 23:57:01,608 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 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) [2023-11-24 23:57:01,609 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 72 transitions. [2023-11-24 23:57:01,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-24 23:57:01,609 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:57:01,609 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:57:01,610 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-24 23:57:01,610 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 30 more)] === [2023-11-24 23:57:01,611 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:57:01,611 INFO L85 PathProgramCache]: Analyzing trace with hash -1854644569, now seen corresponding path program 1 times [2023-11-24 23:57:01,611 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:57:01,611 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996964799] [2023-11-24 23:57:01,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:01,612 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:57:01,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:01,896 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:57:01,896 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:57:01,897 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996964799] [2023-11-24 23:57:01,897 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1996964799] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:57:01,897 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:57:01,898 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-24 23:57:01,898 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189545095] [2023-11-24 23:57:01,898 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:57:01,901 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-24 23:57:01,901 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:57:01,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-24 23:57:01,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-24 23:57:01,906 INFO L87 Difference]: Start difference. First operand 66 states and 72 transitions. Second operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 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) [2023-11-24 23:57:02,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:57:02,058 INFO L93 Difference]: Finished difference Result 66 states and 73 transitions. [2023-11-24 23:57:02,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:57:02,058 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 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 10 [2023-11-24 23:57:02,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:57:02,061 INFO L225 Difference]: With dead ends: 66 [2023-11-24 23:57:02,062 INFO L226 Difference]: Without dead ends: 66 [2023-11-24 23:57:02,062 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-11-24 23:57:02,067 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 5 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:57:02,068 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 223 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:57:02,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-11-24 23:57:02,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2023-11-24 23:57:02,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 61 states have internal predecessors, (67), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:57:02,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 71 transitions. [2023-11-24 23:57:02,086 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 71 transitions. Word has length 10 [2023-11-24 23:57:02,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:57:02,087 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 71 transitions. [2023-11-24 23:57:02,087 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 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) [2023-11-24 23:57:02,087 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 71 transitions. [2023-11-24 23:57:02,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-24 23:57:02,088 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:57:02,089 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:57:02,089 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-24 23:57:02,089 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 30 more)] === [2023-11-24 23:57:02,090 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:57:02,090 INFO L85 PathProgramCache]: Analyzing trace with hash -417720717, now seen corresponding path program 1 times [2023-11-24 23:57:02,090 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:57:02,091 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428230938] [2023-11-24 23:57:02,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:02,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:57:02,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:02,310 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:57:02,311 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:57:02,311 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428230938] [2023-11-24 23:57:02,311 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1428230938] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:57:02,311 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1314867893] [2023-11-24 23:57:02,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:02,313 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:57:02,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:57:02,321 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:57:02,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-24 23:57:02,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:02,463 INFO L262 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-24 23:57:02,469 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:57:02,520 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:57:02,520 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:57:02,553 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:57:02,553 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1314867893] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:57:02,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [681734012] [2023-11-24 23:57:02,581 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-24 23:57:02,581 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:57:02,586 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:57:02,593 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:57:02,593 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:57:04,917 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 144 for LOIs [2023-11-24 23:57:05,564 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:57:05,587 WARN L876 $PredicateComparison]: unable to prove that (and (= |c_ULTIMATE.start_sll_append_#in~data#1| 1) (= |c_ULTIMATE.start_sll_append_~data#1| 1) (= |c_ULTIMATE.start_main_~#s~0#1.offset| 0) (not (= (select |c_#valid| |c_ULTIMATE.start_sll_append_~head#1.base|) 1)) (<= 1 |c_#StackHeapBarrier|) (= |c_ULTIMATE.start_sll_create_#res#1.offset| 0) (= |c_ULTIMATE.start_sll_append_~new_last~0#1.offset| 0) (= |c_ULTIMATE.start_main_~data~0#1| 1) (= |c_ULTIMATE.start_sll_append_~head#1.offset| 0) (= |c_ULTIMATE.start_sll_append_#in~head#1.offset| 0) (<= 2 |c_ULTIMATE.start_main_~#s~0#1.base|) (let ((.cse0 (exists ((|v_#length_69| (Array Int Int))) (= (store |v_#length_69| |c_ULTIMATE.start_sll_append_~new_last~0#1.base| 8) |c_#length|))) (.cse1 (= (select |c_#valid| |c_ULTIMATE.start_sll_append_~new_last~0#1.base|) 1)) (.cse2 (= |c_ULTIMATE.start_sll_append_#in~head#1.base| |c_ULTIMATE.start_sll_append_~head#1.base|)) (.cse3 (= |c_ULTIMATE.start_sll_append_#in~head#1.base| |c_ULTIMATE.start_main_~#s~0#1.base|)) (.cse4 (not (= |c_ULTIMATE.start_sll_append_~new_last~0#1.base| 0))) (.cse5 (exists ((|v_#valid_84| (Array Int Int))) (and (= (select |v_#valid_84| |c_ULTIMATE.start_sll_append_~new_last~0#1.base|) 0) (= |c_#valid| (store |v_#valid_84| |c_ULTIMATE.start_sll_append_~new_last~0#1.base| 1))))) (.cse6 (exists ((|v_#memory_int_42| (Array Int (Array Int Int))) (|v_#memory_int_43| (Array Int (Array Int Int)))) (let ((.cse12 (select |v_#memory_int_43| |c_ULTIMATE.start_sll_append_~new_last~0#1.base|))) (and (= (store |v_#memory_int_43| |c_ULTIMATE.start_sll_append_~new_last~0#1.base| (store .cse12 0 1)) |c_#memory_int|) (= |v_#memory_int_43| (store |v_#memory_int_42| |c_ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select |v_#memory_int_42| |c_ULTIMATE.start_sll_append_~new_last~0#1.base|) 4 (select .cse12 4)))))))) (.cse7 (exists ((|v_#memory_$Pointer$.offset_67| (Array Int (Array Int Int)))) (= (select (select (store |v_#memory_$Pointer$.offset_67| |c_ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.offset_67| |c_ULTIMATE.start_sll_create_#res#1.base|) 4 0)) |c_ULTIMATE.start_main_~#s~0#1.base|) 0) 0))) (.cse8 (exists ((|v_#memory_$Pointer$.offset_63| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.offset_63| |c_ULTIMATE.start_sll_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_63| |c_ULTIMATE.start_sll_append_~new_last~0#1.base|) 4 0) 0 (select (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_append_~new_last~0#1.base|) 0))) |c_#memory_$Pointer$.offset|))) (.cse9 (<= 8 (select |c_#length| |c_ULTIMATE.start_sll_append_~new_last~0#1.base|))) (.cse10 (<= (+ |c_ULTIMATE.start_sll_append_~new_last~0#1.base| 1) |c_#StackHeapBarrier|)) (.cse11 (exists ((|v_#memory_$Pointer$.base_63| (Array Int (Array Int Int)))) (= |c_#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_63| |c_ULTIMATE.start_sll_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.base_63| |c_ULTIMATE.start_sll_append_~new_last~0#1.base|) 4 0) 0 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_append_~new_last~0#1.base|) 0))))))) (or (and .cse0 .cse1 .cse2 .cse3 .cse4 (exists ((|v_old(#length)_AFTER_CALL_9| (Array Int Int))) (<= 8 (select |v_old(#length)_AFTER_CALL_9| |c_ULTIMATE.start_sll_create_#res#1.base|))) .cse5 .cse6 .cse7 .cse8 .cse9 (exists ((|v_#memory_$Pointer$.base_67| (Array Int (Array Int Int))) (|v_old(#memory_$Pointer$.base)_AFTER_CALL_9| (Array Int (Array Int Int)))) (and (= (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_9| |c_ULTIMATE.start_main_~#s~0#1.base|) 0) |c_ULTIMATE.start_sll_create_#res#1.base|) (= |v_old(#memory_$Pointer$.base)_AFTER_CALL_9| (store |v_#memory_$Pointer$.base_67| |c_ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.base_67| |c_ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_9| |c_ULTIMATE.start_sll_create_#res#1.base|) 4)))))) .cse10 (exists ((|v_#memory_int_46| (Array Int (Array Int Int))) (|v_old(#memory_int)_AFTER_CALL_9| (Array Int (Array Int Int)))) (= (store |v_#memory_int_46| |c_ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_int_46| |c_ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_int)_AFTER_CALL_9| |c_ULTIMATE.start_sll_create_#res#1.base|) 4))) |v_old(#memory_int)_AFTER_CALL_9|)) (exists ((|v_old(#valid)_AFTER_CALL_9| (Array Int Int))) (= (select |v_old(#valid)_AFTER_CALL_9| |c_ULTIMATE.start_sll_create_#res#1.base|) 1)) .cse11) (and .cse0 .cse1 .cse2 .cse3 .cse4 .cse5 .cse6 .cse7 (exists ((|v_#memory_int_46| (Array Int (Array Int Int))) (|v_old(#memory_int)_AFTER_CALL_10| (Array Int (Array Int Int)))) (= |v_old(#memory_int)_AFTER_CALL_10| (store |v_#memory_int_46| |c_ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_int_46| |c_ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_int)_AFTER_CALL_10| |c_ULTIMATE.start_sll_create_#res#1.base|) 4))))) .cse8 (exists ((|v_old(#valid)_AFTER_CALL_10| (Array Int Int))) (= (select |v_old(#valid)_AFTER_CALL_10| |c_ULTIMATE.start_sll_create_#res#1.base|) 1)) .cse9 (exists ((|v_#length_BEFORE_CALL_17| (Array Int Int))) (<= 8 (select |v_#length_BEFORE_CALL_17| |c_ULTIMATE.start_sll_create_#res#1.base|))) (exists ((|v_old(#memory_$Pointer$.base)_AFTER_CALL_10| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_67| (Array Int (Array Int Int)))) (and (= |v_old(#memory_$Pointer$.base)_AFTER_CALL_10| (store |v_#memory_$Pointer$.base_67| |c_ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.base_67| |c_ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_10| |c_ULTIMATE.start_sll_create_#res#1.base|) 4)))) (= |c_ULTIMATE.start_sll_create_#res#1.base| (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_10| |c_ULTIMATE.start_main_~#s~0#1.base|) 0)))) .cse10 .cse11))) (<= 2 |c_ULTIMATE.start_sll_append_~head#1.base|) (= |c_ULTIMATE.start_main_~len~0#1| 2) (<= 2 |c_ULTIMATE.start_sll_append_#in~head#1.base|)) is different from true [2023-11-24 23:57:17,643 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '899#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_append_~data#1| 1) (= 1 |ULTIMATE.start_sll_append_#in~data#1|) (<= 2 |ULTIMATE.start_sll_append_#in~head#1.base|) (= |ULTIMATE.start_sll_append_~head#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (or (and (exists ((|v_#valid_84| (Array Int Int))) (and (= (store |v_#valid_84| |ULTIMATE.start_sll_append_~new_last~0#1.base| 1) |#valid|) (= (select |v_#valid_84| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0))) (= (select |#valid| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 1) (<= 8 (select |#length| |ULTIMATE.start_sll_append_~new_last~0#1.base|)) (exists ((|v_old(#valid)_AFTER_CALL_10| (Array Int Int))) (= 1 (select |v_old(#valid)_AFTER_CALL_10| |ULTIMATE.start_sll_create_#res#1.base|))) (exists ((|v_#memory_int_42| (Array Int (Array Int Int))) (|v_#memory_int_43| (Array Int (Array Int Int)))) (and (= |#memory_int| (store |v_#memory_int_43| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select |v_#memory_int_43| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 1))) (= |v_#memory_int_43| (store |v_#memory_int_42| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select |v_#memory_int_42| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 4 (select (select |v_#memory_int_43| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 4)))))) (exists ((|v_#length_69| (Array Int Int))) (= |#length| (store |v_#length_69| |ULTIMATE.start_sll_append_~new_last~0#1.base| 8))) (<= (+ |ULTIMATE.start_sll_append_~new_last~0#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.base_63| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_63| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.base_63| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 4 0) 0 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0))) |#memory_$Pointer$.base|)) (exists ((|v_#length_BEFORE_CALL_17| (Array Int Int))) (<= 8 (select |v_#length_BEFORE_CALL_17| |ULTIMATE.start_sll_create_#res#1.base|))) (not (= |ULTIMATE.start_sll_append_~new_last~0#1.base| 0)) (= |ULTIMATE.start_sll_append_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_append_#in~head#1.base| |ULTIMATE.start_sll_append_~head#1.base|) (exists ((|v_#memory_$Pointer$.offset_67| (Array Int (Array Int Int)))) (= (select (select (store |v_#memory_$Pointer$.offset_67| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.offset_67| |ULTIMATE.start_sll_create_#res#1.base|) 4 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (exists ((|v_#memory_int_46| (Array Int (Array Int Int))) (|v_old(#memory_int)_AFTER_CALL_10| (Array Int (Array Int Int)))) (= |v_old(#memory_int)_AFTER_CALL_10| (store |v_#memory_int_46| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_int_46| |ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_int)_AFTER_CALL_10| |ULTIMATE.start_sll_create_#res#1.base|) 4))))) (exists ((|v_old(#memory_$Pointer$.base)_AFTER_CALL_10| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_67| (Array Int (Array Int Int)))) (and (= (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_10| |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_create_#res#1.base|) (= |v_old(#memory_$Pointer$.base)_AFTER_CALL_10| (store |v_#memory_$Pointer$.base_67| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.base_67| |ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_10| |ULTIMATE.start_sll_create_#res#1.base|) 4)))))) (exists ((|v_#memory_$Pointer$.offset_63| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_63| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_63| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 4 0) 0 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0)))))) (and (exists ((|v_#valid_84| (Array Int Int))) (and (= (store |v_#valid_84| |ULTIMATE.start_sll_append_~new_last~0#1.base| 1) |#valid|) (= (select |v_#valid_84| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0))) (= (select |#valid| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 1) (<= 8 (select |#length| |ULTIMATE.start_sll_append_~new_last~0#1.base|)) (exists ((|v_#memory_int_42| (Array Int (Array Int Int))) (|v_#memory_int_43| (Array Int (Array Int Int)))) (and (= |#memory_int| (store |v_#memory_int_43| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select |v_#memory_int_43| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 1))) (= |v_#memory_int_43| (store |v_#memory_int_42| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select |v_#memory_int_42| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 4 (select (select |v_#memory_int_43| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 4)))))) (exists ((|v_#length_69| (Array Int Int))) (= |#length| (store |v_#length_69| |ULTIMATE.start_sll_append_~new_last~0#1.base| 8))) (<= (+ |ULTIMATE.start_sll_append_~new_last~0#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.base_63| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_63| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.base_63| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 4 0) 0 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0))) |#memory_$Pointer$.base|)) (not (= |ULTIMATE.start_sll_append_~new_last~0#1.base| 0)) (exists ((|v_old(#length)_AFTER_CALL_9| (Array Int Int))) (<= 8 (select |v_old(#length)_AFTER_CALL_9| |ULTIMATE.start_sll_create_#res#1.base|))) (exists ((|v_#memory_$Pointer$.base_67| (Array Int (Array Int Int))) (|v_old(#memory_$Pointer$.base)_AFTER_CALL_9| (Array Int (Array Int Int)))) (and (= |v_old(#memory_$Pointer$.base)_AFTER_CALL_9| (store |v_#memory_$Pointer$.base_67| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.base_67| |ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_9| |ULTIMATE.start_sll_create_#res#1.base|) 4)))) (= (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_9| |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_create_#res#1.base|))) (= |ULTIMATE.start_sll_append_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (exists ((|v_old(#valid)_AFTER_CALL_9| (Array Int Int))) (= (select |v_old(#valid)_AFTER_CALL_9| |ULTIMATE.start_sll_create_#res#1.base|) 1)) (= |ULTIMATE.start_sll_append_#in~head#1.base| |ULTIMATE.start_sll_append_~head#1.base|) (exists ((|v_#memory_int_46| (Array Int (Array Int Int))) (|v_old(#memory_int)_AFTER_CALL_9| (Array Int (Array Int Int)))) (= (store |v_#memory_int_46| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_int_46| |ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_int)_AFTER_CALL_9| |ULTIMATE.start_sll_create_#res#1.base|) 4))) |v_old(#memory_int)_AFTER_CALL_9|)) (exists ((|v_#memory_$Pointer$.offset_67| (Array Int (Array Int Int)))) (= (select (select (store |v_#memory_$Pointer$.offset_67| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.offset_67| |ULTIMATE.start_sll_create_#res#1.base|) 4 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (exists ((|v_#memory_$Pointer$.offset_63| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_63| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_63| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 4 0) 0 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0))))))) (= |ULTIMATE.start_main_~data~0#1| 1) (<= 2 |ULTIMATE.start_sll_append_~head#1.base|) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_sll_append_~new_last~0#1.offset| 0) (not (= (select |#valid| |ULTIMATE.start_sll_append_~head#1.base|) 1)) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_append_#in~head#1.offset| 0))' at error location [2023-11-24 23:57:17,644 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:57:17,644 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:57:17,644 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 4 [2023-11-24 23:57:17,645 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126922813] [2023-11-24 23:57:17,645 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:57:17,649 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-24 23:57:17,649 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:57:17,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-24 23:57:17,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=178, Unknown=4, NotChecked=26, Total=240 [2023-11-24 23:57:17,651 INFO L87 Difference]: Start difference. First operand 65 states and 71 transitions. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-24 23:57:17,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:57:17,699 INFO L93 Difference]: Finished difference Result 69 states and 76 transitions. [2023-11-24 23:57:17,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-24 23:57:17,699 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 19 [2023-11-24 23:57:17,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:57:17,700 INFO L225 Difference]: With dead ends: 69 [2023-11-24 23:57:17,701 INFO L226 Difference]: Without dead ends: 69 [2023-11-24 23:57:17,701 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=32, Invalid=178, Unknown=4, NotChecked=26, Total=240 [2023-11-24 23:57:17,702 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 2 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:57:17,702 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 111 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:57:17,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2023-11-24 23:57:17,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2023-11-24 23:57:17,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 38 states have (on average 1.8421052631578947) internal successors, (70), 64 states have internal predecessors, (70), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-24 23:57:17,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 76 transitions. [2023-11-24 23:57:17,708 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 76 transitions. Word has length 19 [2023-11-24 23:57:17,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:57:17,709 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 76 transitions. [2023-11-24 23:57:17,709 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-24 23:57:17,709 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 76 transitions. [2023-11-24 23:57:17,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-24 23:57:17,710 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:57:17,710 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-24 23:57:17,722 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-24 23:57:17,916 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-24 23:57:17,917 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 30 more)] === [2023-11-24 23:57:17,917 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:57:17,917 INFO L85 PathProgramCache]: Analyzing trace with hash 2141499312, now seen corresponding path program 2 times [2023-11-24 23:57:17,917 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:57:17,917 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [335487231] [2023-11-24 23:57:17,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:17,918 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:57:17,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:18,555 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-24 23:57:18,556 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:57:18,558 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [335487231] [2023-11-24 23:57:18,558 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [335487231] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:57:18,558 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [440007979] [2023-11-24 23:57:18,558 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-24 23:57:18,559 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:57:18,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:57:18,560 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:57:18,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-24 23:57:18,748 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-24 23:57:18,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:57:18,751 INFO L262 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 21 conjunts are in the unsatisfiable core [2023-11-24 23:57:18,755 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:57:18,784 INFO L378 Elim1Store]: Elim1 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 [2023-11-24 23:57:18,815 INFO L378 Elim1Store]: Elim1 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 [2023-11-24 23:57:18,830 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| (select |c_#valid| |node_create_~temp~0#1.base|))))) is different from true [2023-11-24 23:57:18,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-24 23:57:18,884 INFO L378 Elim1Store]: Elim1 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 14 treesize of output 9 [2023-11-24 23:57:18,904 INFO L378 Elim1Store]: Elim1 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 [2023-11-24 23:57:18,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-24 23:57:18,937 INFO L378 Elim1Store]: Elim1 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 14 treesize of output 9 [2023-11-24 23:57:18,970 INFO L378 Elim1Store]: Elim1 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 [2023-11-24 23:57:19,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-24 23:57:19,001 INFO L378 Elim1Store]: Elim1 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 14 treesize of output 9 [2023-11-24 23:57:19,005 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-24 23:57:19,005 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:57:19,006 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [440007979] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:57:19,006 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:57:19,006 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 11 [2023-11-24 23:57:19,006 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230708647] [2023-11-24 23:57:19,006 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:57:19,007 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-24 23:57:19,007 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:57:19,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-24 23:57:19,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=103, Unknown=1, NotChecked=20, Total=156 [2023-11-24 23:57:19,008 INFO L87 Difference]: Start difference. First operand 69 states and 76 transitions. Second operand has 7 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:57:19,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:57:19,127 INFO L93 Difference]: Finished difference Result 66 states and 73 transitions. [2023-11-24 23:57:19,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-24 23:57:19,127 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2023-11-24 23:57:19,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:57:19,128 INFO L225 Difference]: With dead ends: 66 [2023-11-24 23:57:19,128 INFO L226 Difference]: Without dead ends: 66 [2023-11-24 23:57:19,129 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=121, Unknown=1, NotChecked=22, Total=182 [2023-11-24 23:57:19,129 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 20 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 85 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:57:19,130 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 121 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 120 Invalid, 0 Unknown, 85 Unchecked, 0.1s Time] [2023-11-24 23:57:19,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-11-24 23:57:19,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2023-11-24 23:57:19,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 38 states have (on average 1.763157894736842) internal successors, (67), 61 states have internal predecessors, (67), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-24 23:57:19,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 73 transitions. [2023-11-24 23:57:19,137 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 73 transitions. Word has length 28 [2023-11-24 23:57:19,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:57:19,137 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 73 transitions. [2023-11-24 23:57:19,138 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:57:19,138 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 73 transitions. [2023-11-24 23:57:19,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-24 23:57:19,139 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:57:19,139 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-24 23:57:19,151 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-24 23:57:19,350 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-24 23:57:19,351 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 30 more)] === [2023-11-24 23:57:19,351 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:57:19,351 INFO L85 PathProgramCache]: Analyzing trace with hash 2141499313, now seen corresponding path program 1 times [2023-11-24 23:57:19,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:57:19,351 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451179478] [2023-11-24 23:57:19,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:19,352 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:57:19,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:20,125 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-24 23:57:20,125 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:57:20,125 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451179478] [2023-11-24 23:57:20,126 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1451179478] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:57:20,126 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [531625924] [2023-11-24 23:57:20,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:20,126 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:57:20,126 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:57:20,131 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:57:20,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-24 23:57:20,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:20,283 INFO L262 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-24 23:57:20,287 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:57:20,300 INFO L378 Elim1Store]: Elim1 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 8 treesize of output 1 [2023-11-24 23:57:20,320 INFO L378 Elim1Store]: Elim1 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 [2023-11-24 23:57:20,328 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= (store |c_old(#length)| |node_create_~temp~0#1.base| (select |c_#length| |node_create_~temp~0#1.base|)) |c_#length|))) is different from true [2023-11-24 23:57:20,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-24 23:57:20,355 INFO L378 Elim1Store]: Elim1 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 14 treesize of output 9 [2023-11-24 23:57:20,398 INFO L378 Elim1Store]: Elim1 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 [2023-11-24 23:57:20,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-24 23:57:20,436 INFO L378 Elim1Store]: Elim1 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 14 treesize of output 9 [2023-11-24 23:57:20,484 INFO L378 Elim1Store]: Elim1 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 [2023-11-24 23:57:20,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-24 23:57:20,518 INFO L378 Elim1Store]: Elim1 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 14 treesize of output 9 [2023-11-24 23:57:20,525 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-24 23:57:20,525 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:57:20,525 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [531625924] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:57:20,526 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:57:20,526 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [12] total 13 [2023-11-24 23:57:20,526 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381508766] [2023-11-24 23:57:20,526 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:57:20,527 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-24 23:57:20,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:57:20,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-24 23:57:20,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=144, Unknown=1, NotChecked=24, Total=210 [2023-11-24 23:57:20,528 INFO L87 Difference]: Start difference. First operand 66 states and 73 transitions. Second operand has 7 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:57:20,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:57:20,685 INFO L93 Difference]: Finished difference Result 63 states and 70 transitions. [2023-11-24 23:57:20,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-24 23:57:20,685 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2023-11-24 23:57:20,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:57:20,686 INFO L225 Difference]: With dead ends: 63 [2023-11-24 23:57:20,686 INFO L226 Difference]: Without dead ends: 63 [2023-11-24 23:57:20,687 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=167, Unknown=1, NotChecked=26, Total=240 [2023-11-24 23:57:20,687 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 17 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 82 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:57:20,688 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 151 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 119 Invalid, 0 Unknown, 82 Unchecked, 0.1s Time] [2023-11-24 23:57:20,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-11-24 23:57:20,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2023-11-24 23:57:20,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 58 states have internal predecessors, (64), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-24 23:57:20,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 70 transitions. [2023-11-24 23:57:20,693 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 70 transitions. Word has length 28 [2023-11-24 23:57:20,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:57:20,693 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 70 transitions. [2023-11-24 23:57:20,693 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:57:20,693 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 70 transitions. [2023-11-24 23:57:20,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-11-24 23:57:20,694 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:57:20,694 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:57:20,705 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-24 23:57:20,895 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-24 23:57:20,895 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 30 more)] === [2023-11-24 23:57:20,895 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:57:20,896 INFO L85 PathProgramCache]: Analyzing trace with hash -38199815, now seen corresponding path program 1 times [2023-11-24 23:57:20,896 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:57:20,896 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656875603] [2023-11-24 23:57:20,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:20,897 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:57:20,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:22,062 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 14 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-24 23:57:22,062 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:57:22,062 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656875603] [2023-11-24 23:57:22,063 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1656875603] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:57:22,063 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [465359446] [2023-11-24 23:57:22,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:22,063 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:57:22,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:57:22,064 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:57:22,066 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-24 23:57:22,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:22,211 INFO L262 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 64 conjunts are in the unsatisfiable core [2023-11-24 23:57:22,216 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:57:22,285 INFO L378 Elim1Store]: Elim1 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 [2023-11-24 23:57:22,624 INFO L378 Elim1Store]: Elim1 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 19 treesize of output 11 [2023-11-24 23:57:22,629 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-11-24 23:57:22,833 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= (store |c_old(#length)| |node_create_~temp~0#1.base| (select |c_#length| |node_create_~temp~0#1.base|)) |c_#length|) (= |c_#memory_$Pointer$.offset| (store |c_old(#memory_$Pointer$.offset)| |node_create_~temp~0#1.base| (select |c_#memory_$Pointer$.offset| |node_create_~temp~0#1.base|))) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| |node_create_~temp~0#1.base| (select |c_#memory_$Pointer$.base| |node_create_~temp~0#1.base|))) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-24 23:57:22,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-24 23:57:22,855 INFO L378 Elim1Store]: Elim1 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 18 treesize of output 13 [2023-11-24 23:57:22,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-24 23:57:22,864 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 20 [2023-11-24 23:57:22,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-24 23:57:22,873 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-24 23:57:22,892 INFO L349 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2023-11-24 23:57:22,893 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2023-11-24 23:57:22,961 INFO L378 Elim1Store]: Elim1 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 17 treesize of output 9 [2023-11-24 23:57:22,996 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 14 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 1 not checked. [2023-11-24 23:57:22,996 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:57:23,369 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [465359446] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:57:23,369 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [605532624] [2023-11-24 23:57:23,372 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-24 23:57:23,372 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:57:23,373 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:57:23,373 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:57:23,373 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:57:24,920 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 123 for LOIs [2023-11-24 23:57:25,521 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:57:34,976 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1641#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_append_~data#1| 1) (= |ULTIMATE.start_sll_append_~last~0#1.offset| (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_append_~head#1.base|) 0)) (= 1 |ULTIMATE.start_sll_append_#in~data#1|) (or (not (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_append_~head#1.base|) 0) 0)) (not (= 0 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_append_~head#1.base|) 0)))) (= |ULTIMATE.start_sll_append_~last~0#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_append_~head#1.base|) 0)) (= |ULTIMATE.start_sll_append_~head#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (<= 4 (select |#length| |ULTIMATE.start_sll_append_~head#1.base|)) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_sll_append_~new_last~0#1.offset| 0) (or (< (select |#length| |ULTIMATE.start_sll_append_~last~0#1.base|) (+ |ULTIMATE.start_sll_append_~last~0#1.offset| 8)) (< (+ |ULTIMATE.start_sll_append_~last~0#1.offset| 4) 0)) (or (and (<= (+ |ULTIMATE.start_sll_append_~new_last~0#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#length_83| (Array Int Int))) (= |#length| (store |v_#length_83| |ULTIMATE.start_sll_append_~new_last~0#1.base| 8))) (not (= |ULTIMATE.start_sll_append_~new_last~0#1.base| 0)) (exists ((|v_#valid_98| (Array Int Int))) (and (= (select |v_#valid_98| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0) (= |#valid| (store |v_#valid_98| |ULTIMATE.start_sll_append_~new_last~0#1.base| 1)))) (exists ((|v_#memory_$Pointer$.base_79| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_79| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.base_79| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 4 0) 0 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0))))) (= |ULTIMATE.start_sll_append_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (exists ((|v_#memory_$Pointer$.offset_79| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_79| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_79| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 4 0) 0 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0))))) (= |ULTIMATE.start_sll_append_#in~head#1.base| |ULTIMATE.start_sll_append_~head#1.base|) (exists ((|v_old(#memory_$Pointer$.base)_AFTER_CALL_27| (Array Int (Array Int Int)))) (= (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_27| |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_create_#res#1.base|)) (exists ((|v_old(#memory_$Pointer$.offset)_AFTER_CALL_27| (Array Int (Array Int Int)))) (= (select (select |v_old(#memory_$Pointer$.offset)_AFTER_CALL_27| |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (exists ((|v_#memory_int_54| (Array Int (Array Int Int))) (|v_#memory_int_55| (Array Int (Array Int Int)))) (and (= |#memory_int| (store |v_#memory_int_55| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select |v_#memory_int_55| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 1))) (= (store |v_#memory_int_54| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select |v_#memory_int_54| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 4 (select (select |v_#memory_int_55| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 4))) |v_#memory_int_55|)))) (and (exists ((|v_old(#memory_$Pointer$.base)_AFTER_CALL_26| (Array Int (Array Int Int)))) (= (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_26| |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_create_#res#1.base|)) (<= (+ |ULTIMATE.start_sll_append_~new_last~0#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#length_83| (Array Int Int))) (= |#length| (store |v_#length_83| |ULTIMATE.start_sll_append_~new_last~0#1.base| 8))) (not (= |ULTIMATE.start_sll_append_~new_last~0#1.base| 0)) (exists ((|v_#valid_98| (Array Int Int))) (and (= (select |v_#valid_98| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0) (= |#valid| (store |v_#valid_98| |ULTIMATE.start_sll_append_~new_last~0#1.base| 1)))) (exists ((|v_#memory_$Pointer$.base_79| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_79| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.base_79| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 4 0) 0 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0))))) (= |ULTIMATE.start_sll_append_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (exists ((|v_#memory_$Pointer$.offset_79| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_79| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_79| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 4 0) 0 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0))))) (= |ULTIMATE.start_sll_append_#in~head#1.base| |ULTIMATE.start_sll_append_~head#1.base|) (exists ((|v_#memory_$Pointer$.offset_BEFORE_CALL_35| (Array Int (Array Int Int)))) (= (select (select |v_#memory_$Pointer$.offset_BEFORE_CALL_35| |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (exists ((|v_#memory_int_54| (Array Int (Array Int Int))) (|v_#memory_int_55| (Array Int (Array Int Int)))) (and (= |#memory_int| (store |v_#memory_int_55| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select |v_#memory_int_55| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 1))) (= (store |v_#memory_int_54| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select |v_#memory_int_54| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 4 (select (select |v_#memory_int_55| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 4))) |v_#memory_int_55|))))) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_append_#in~head#1.offset| 0) (= (select |#valid| |ULTIMATE.start_sll_append_~head#1.base|) 1))' at error location [2023-11-24 23:57:34,976 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:57:34,976 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-24 23:57:34,977 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 28 [2023-11-24 23:57:34,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346571726] [2023-11-24 23:57:34,977 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-24 23:57:34,977 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-11-24 23:57:34,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:57:34,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-11-24 23:57:34,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1904, Unknown=16, NotChecked=88, Total=2162 [2023-11-24 23:57:34,980 INFO L87 Difference]: Start difference. First operand 63 states and 70 transitions. Second operand has 29 states, 22 states have (on average 2.0) internal successors, (44), 25 states have internal predecessors, (44), 4 states have call successors, (4), 3 states have call predecessors, (4), 5 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-24 23:57:36,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:57:36,725 INFO L93 Difference]: Finished difference Result 71 states and 79 transitions. [2023-11-24 23:57:36,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-24 23:57:36,726 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 22 states have (on average 2.0) internal successors, (44), 25 states have internal predecessors, (44), 4 states have call successors, (4), 3 states have call predecessors, (4), 5 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) Word has length 31 [2023-11-24 23:57:36,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:57:36,727 INFO L225 Difference]: With dead ends: 71 [2023-11-24 23:57:36,727 INFO L226 Difference]: Without dead ends: 71 [2023-11-24 23:57:36,729 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 700 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=259, Invalid=2912, Unknown=25, NotChecked=110, Total=3306 [2023-11-24 23:57:36,731 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 192 mSDsluCounter, 536 mSDsCounter, 0 mSdLazyCounter, 967 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 569 SdHoareTripleChecker+Invalid, 1058 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 967 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 77 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:57:36,732 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [192 Valid, 569 Invalid, 1058 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 967 Invalid, 0 Unknown, 77 Unchecked, 1.0s Time] [2023-11-24 23:57:36,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2023-11-24 23:57:36,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 67. [2023-11-24 23:57:36,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 42 states have (on average 1.7142857142857142) internal successors, (72), 62 states have internal predecessors, (72), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-24 23:57:36,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 78 transitions. [2023-11-24 23:57:36,737 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 78 transitions. Word has length 31 [2023-11-24 23:57:36,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:57:36,737 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 78 transitions. [2023-11-24 23:57:36,737 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 22 states have (on average 2.0) internal successors, (44), 25 states have internal predecessors, (44), 4 states have call successors, (4), 3 states have call predecessors, (4), 5 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-24 23:57:36,737 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 78 transitions. [2023-11-24 23:57:36,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-11-24 23:57:36,738 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:57:36,739 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:57:36,745 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-24 23:57:36,945 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-24 23:57:36,945 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 30 more)] === [2023-11-24 23:57:36,946 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:57:36,946 INFO L85 PathProgramCache]: Analyzing trace with hash -38199816, now seen corresponding path program 1 times [2023-11-24 23:57:36,946 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:57:36,946 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [571530328] [2023-11-24 23:57:36,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:36,947 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:57:36,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:37,665 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-24 23:57:37,665 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:57:37,665 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [571530328] [2023-11-24 23:57:37,665 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [571530328] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:57:37,665 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [576081269] [2023-11-24 23:57:37,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:37,666 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:57:37,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:57:37,669 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:57:37,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_440fb7e5-3687-4760-9f37-e93bc094b82e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-24 23:57:37,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:37,851 INFO L262 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 39 conjunts are in the unsatisfiable core [2023-11-24 23:57:37,860 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:57:37,911 INFO L378 Elim1Store]: Elim1 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 [2023-11-24 23:57:38,076 INFO L378 Elim1Store]: Elim1 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 9 treesize of output 5 [2023-11-24 23:57:38,150 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| |node_create_~temp~0#1.base| (select |c_#memory_$Pointer$.base| |node_create_~temp~0#1.base|))) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| 1)))) is different from true [2023-11-24 23:57:38,174 INFO L349 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2023-11-24 23:57:38,175 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 18 [2023-11-24 23:57:38,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-24 23:57:38,181 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-11-24 23:57:38,276 INFO L378 Elim1Store]: Elim1 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 17 treesize of output 9 [2023-11-24 23:57:38,305 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 1 not checked. [2023-11-24 23:57:38,305 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:57:40,378 WARN L854 $PredicateComparison]: unable to prove that (forall ((|v_node_create_~temp~0#1.base_26| Int) (v_ArrVal_598 (Array Int Int))) (or (< |c_#StackHeapBarrier| (+ |v_node_create_~temp~0#1.base_26| 1)) (= (select (store |c_#valid| |v_node_create_~temp~0#1.base_26| 1) (select (select (store |c_#memory_$Pointer$.base| |v_node_create_~temp~0#1.base_26| v_ArrVal_598) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|)) 1))) is different from false [2023-11-24 23:57:40,380 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [576081269] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:57:40,381 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1182661114] [2023-11-24 23:57:40,383 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-24 23:57:40,383 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:57:40,384 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:57:40,384 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:57:40,384 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:57:42,000 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 144 for LOIs [2023-11-24 23:57:42,520 INFO L180 IcfgInterpreter]: Interpretation finished