./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/memsafety-ext2/split_list_test05-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version cf1a7837 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d92f43a-9ab7-4baa-bdd9-c039e091e4de/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d92f43a-9ab7-4baa-bdd9-c039e091e4de/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d92f43a-9ab7-4baa-bdd9-c039e091e4de/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d92f43a-9ab7-4baa-bdd9-c039e091e4de/bin/utaipan-verify-NcY6lQBIFX/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety-ext2/split_list_test05-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d92f43a-9ab7-4baa-bdd9-c039e091e4de/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d92f43a-9ab7-4baa-bdd9-c039e091e4de/bin/utaipan-verify-NcY6lQBIFX --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 753b20bc59ec3e8b11fc0f1b54dadf2ece41f6cecc7eda05bde7d4413de53136 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:13:19,478 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:13:19,598 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d92f43a-9ab7-4baa-bdd9-c039e091e4de/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-12 00:13:19,606 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:13:19,607 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:13:19,648 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:13:19,648 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:13:19,649 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:13:19,650 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:13:19,655 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:13:19,656 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:13:19,657 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:13:19,657 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:13:19,659 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:13:19,659 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:13:19,660 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:13:19,660 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:13:19,661 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:13:19,661 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:13:19,661 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:13:19,662 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:13:19,662 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:13:19,663 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-12 00:13:19,663 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-12 00:13:19,664 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:13:19,665 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:13:19,665 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:13:19,666 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:13:19,666 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:13:19,666 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-12 00:13:19,668 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-12 00:13:19,668 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-12 00:13:19,668 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:13:19,668 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-12 00:13:19,669 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-12 00:13:19,669 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:13:19,669 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:13:19,669 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:13:19,669 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:13:19,670 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:13:19,670 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:13:19,670 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:13:19,671 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:13:19,671 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:13:19,671 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:13:19,672 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:13:19,672 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_6d92f43a-9ab7-4baa-bdd9-c039e091e4de/bin/utaipan-verify-NcY6lQBIFX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d92f43a-9ab7-4baa-bdd9-c039e091e4de/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 753b20bc59ec3e8b11fc0f1b54dadf2ece41f6cecc7eda05bde7d4413de53136 [2023-11-12 00:13:19,955 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:13:19,993 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:13:19,996 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:13:19,997 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:13:19,999 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:13:20,000 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d92f43a-9ab7-4baa-bdd9-c039e091e4de/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/memsafety-ext2/split_list_test05-1.i [2023-11-12 00:13:23,117 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:13:23,552 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:13:23,552 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d92f43a-9ab7-4baa-bdd9-c039e091e4de/sv-benchmarks/c/memsafety-ext2/split_list_test05-1.i [2023-11-12 00:13:23,575 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d92f43a-9ab7-4baa-bdd9-c039e091e4de/bin/utaipan-verify-NcY6lQBIFX/data/e26e51bc7/8830eeedf56b4839b785dc4a0891e198/FLAGbb5b9a275 [2023-11-12 00:13:23,591 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d92f43a-9ab7-4baa-bdd9-c039e091e4de/bin/utaipan-verify-NcY6lQBIFX/data/e26e51bc7/8830eeedf56b4839b785dc4a0891e198 [2023-11-12 00:13:23,599 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:13:23,601 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:13:23,605 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:13:23,605 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:13:23,611 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:13:23,612 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:13:23" (1/1) ... [2023-11-12 00:13:23,613 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4b84c78c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:23, skipping insertion in model container [2023-11-12 00:13:23,613 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:13:23" (1/1) ... [2023-11-12 00:13:23,660 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:13:24,017 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:13:24,036 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:13:24,140 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:13:24,191 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:13:24,191 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:24 WrapperNode [2023-11-12 00:13:24,192 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:13:24,193 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:13:24,193 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:13:24,193 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:13:24,200 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:24" (1/1) ... [2023-11-12 00:13:24,219 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:24" (1/1) ... [2023-11-12 00:13:24,258 INFO L138 Inliner]: procedures = 125, calls = 94, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 315 [2023-11-12 00:13:24,259 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:13:24,259 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:13:24,260 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:13:24,260 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:13:24,270 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:24" (1/1) ... [2023-11-12 00:13:24,270 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:24" (1/1) ... [2023-11-12 00:13:24,278 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:24" (1/1) ... [2023-11-12 00:13:24,278 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:24" (1/1) ... [2023-11-12 00:13:24,297 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:24" (1/1) ... [2023-11-12 00:13:24,303 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:24" (1/1) ... [2023-11-12 00:13:24,306 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:24" (1/1) ... [2023-11-12 00:13:24,309 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:24" (1/1) ... [2023-11-12 00:13:24,315 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:13:24,316 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:13:24,316 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:13:24,317 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:13:24,317 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:24" (1/1) ... [2023-11-12 00:13:24,339 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:13:24,356 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d92f43a-9ab7-4baa-bdd9-c039e091e4de/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:24,374 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d92f43a-9ab7-4baa-bdd9-c039e091e4de/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:13:24,398 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d92f43a-9ab7-4baa-bdd9-c039e091e4de/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:13:24,420 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 00:13:24,420 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 00:13:24,420 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-12 00:13:24,421 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:13:24,421 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-12 00:13:24,421 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-12 00:13:24,421 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 00:13:24,421 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:13:24,422 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:13:24,422 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:13:24,422 INFO L130 BoogieDeclarations]: Found specification of procedure append [2023-11-12 00:13:24,422 INFO L138 BoogieDeclarations]: Found implementation of procedure append [2023-11-12 00:13:24,559 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:13:24,561 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:13:25,447 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:13:25,530 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:13:25,531 INFO L302 CfgBuilder]: Removed 11 assume(true) statements. [2023-11-12 00:13:25,536 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:13:25 BoogieIcfgContainer [2023-11-12 00:13:25,536 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:13:25,540 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:13:25,541 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:13:25,544 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:13:25,544 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:13:23" (1/3) ... [2023-11-12 00:13:25,546 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59778132 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:13:25, skipping insertion in model container [2023-11-12 00:13:25,546 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:24" (2/3) ... [2023-11-12 00:13:25,549 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59778132 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:13:25, skipping insertion in model container [2023-11-12 00:13:25,549 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:13:25" (3/3) ... [2023-11-12 00:13:25,551 INFO L112 eAbstractionObserver]: Analyzing ICFG split_list_test05-1.i [2023-11-12 00:13:25,571 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:13:25,572 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 147 error locations. [2023-11-12 00:13:25,640 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:13:25,647 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;@65f77a30, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:13:25,647 INFO L358 AbstractCegarLoop]: Starting to check reachability of 147 error locations. [2023-11-12 00:13:25,654 INFO L276 IsEmpty]: Start isEmpty. Operand has 293 states, 130 states have (on average 2.353846153846154) internal successors, (306), 279 states have internal predecessors, (306), 14 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-12 00:13:25,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2023-11-12 00:13:25,663 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:25,664 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2023-11-12 00:13:25,664 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2023-11-12 00:13:25,672 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:25,673 INFO L85 PathProgramCache]: Analyzing trace with hash 17705, now seen corresponding path program 1 times [2023-11-12 00:13:25,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:25,684 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1978494281] [2023-11-12 00:13:25,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:25,685 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:25,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:25,959 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:25,960 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:25,960 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1978494281] [2023-11-12 00:13:25,961 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1978494281] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:25,961 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:25,961 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 00:13:25,963 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323200854] [2023-11-12 00:13:25,965 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:25,970 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:13:25,971 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:26,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:13:26,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:13:26,032 INFO L87 Difference]: Start difference. First operand has 293 states, 130 states have (on average 2.353846153846154) internal successors, (306), 279 states have internal predecessors, (306), 14 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:26,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:26,722 INFO L93 Difference]: Finished difference Result 499 states and 552 transitions. [2023-11-12 00:13:26,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:13:26,725 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2023-11-12 00:13:26,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:26,745 INFO L225 Difference]: With dead ends: 499 [2023-11-12 00:13:26,746 INFO L226 Difference]: Without dead ends: 498 [2023-11-12 00:13:26,748 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:13:26,755 INFO L413 NwaCegarLoop]: 196 mSDtfsCounter, 224 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 224 SdHoareTripleChecker+Valid, 362 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:26,757 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [224 Valid, 362 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-12 00:13:26,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 498 states. [2023-11-12 00:13:26,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 498 to 364. [2023-11-12 00:13:26,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 364 states, 204 states have (on average 2.3186274509803924) internal successors, (473), 350 states have internal predecessors, (473), 14 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-12 00:13:26,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 501 transitions. [2023-11-12 00:13:26,861 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 501 transitions. Word has length 2 [2023-11-12 00:13:26,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:26,861 INFO L495 AbstractCegarLoop]: Abstraction has 364 states and 501 transitions. [2023-11-12 00:13:26,861 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:26,862 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 501 transitions. [2023-11-12 00:13:26,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2023-11-12 00:13:26,863 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:26,863 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2023-11-12 00:13:26,864 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:13:26,864 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2023-11-12 00:13:26,864 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:26,865 INFO L85 PathProgramCache]: Analyzing trace with hash 17706, now seen corresponding path program 1 times [2023-11-12 00:13:26,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:26,865 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347903326] [2023-11-12 00:13:26,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:26,866 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:26,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:26,987 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:26,987 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:26,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347903326] [2023-11-12 00:13:26,988 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [347903326] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:26,988 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:26,989 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 00:13:26,989 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559176307] [2023-11-12 00:13:26,989 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:26,990 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:13:26,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:26,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:13:26,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:13:26,992 INFO L87 Difference]: Start difference. First operand 364 states and 501 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:27,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:27,291 INFO L93 Difference]: Finished difference Result 365 states and 504 transitions. [2023-11-12 00:13:27,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:13:27,291 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2023-11-12 00:13:27,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:27,294 INFO L225 Difference]: With dead ends: 365 [2023-11-12 00:13:27,295 INFO L226 Difference]: Without dead ends: 365 [2023-11-12 00:13:27,299 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:13:27,303 INFO L413 NwaCegarLoop]: 285 mSDtfsCounter, 5 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:27,304 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 459 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:13:27,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2023-11-12 00:13:27,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 362. [2023-11-12 00:13:27,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 204 states have (on average 2.3088235294117645) internal successors, (471), 348 states have internal predecessors, (471), 14 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-12 00:13:27,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 499 transitions. [2023-11-12 00:13:27,332 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 499 transitions. Word has length 2 [2023-11-12 00:13:27,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:27,333 INFO L495 AbstractCegarLoop]: Abstraction has 362 states and 499 transitions. [2023-11-12 00:13:27,333 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:27,334 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 499 transitions. [2023-11-12 00:13:27,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-12 00:13:27,334 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:27,334 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:27,335 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-12 00:13:27,335 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2023-11-12 00:13:27,348 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:27,349 INFO L85 PathProgramCache]: Analyzing trace with hash 27741937, now seen corresponding path program 1 times [2023-11-12 00:13:27,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:27,350 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80605971] [2023-11-12 00:13:27,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:27,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:27,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:27,515 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:27,515 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:27,516 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80605971] [2023-11-12 00:13:27,516 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [80605971] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:27,517 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:27,517 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:13:27,518 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840594891] [2023-11-12 00:13:27,518 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:27,519 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:13:27,519 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:27,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:13:27,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:13:27,521 INFO L87 Difference]: Start difference. First operand 362 states and 499 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 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) [2023-11-12 00:13:27,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:27,861 INFO L93 Difference]: Finished difference Result 357 states and 494 transitions. [2023-11-12 00:13:27,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:13:27,862 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 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 8 [2023-11-12 00:13:27,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:27,865 INFO L225 Difference]: With dead ends: 357 [2023-11-12 00:13:27,865 INFO L226 Difference]: Without dead ends: 357 [2023-11-12 00:13:27,866 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 [2023-11-12 00:13:27,867 INFO L413 NwaCegarLoop]: 259 mSDtfsCounter, 39 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 399 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:27,868 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 399 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:13:27,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2023-11-12 00:13:27,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 357. [2023-11-12 00:13:27,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 357 states, 204 states have (on average 2.284313725490196) internal successors, (466), 343 states have internal predecessors, (466), 14 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-12 00:13:27,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 494 transitions. [2023-11-12 00:13:27,898 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 494 transitions. Word has length 8 [2023-11-12 00:13:27,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:27,899 INFO L495 AbstractCegarLoop]: Abstraction has 357 states and 494 transitions. [2023-11-12 00:13:27,899 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 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) [2023-11-12 00:13:27,900 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 494 transitions. [2023-11-12 00:13:27,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-12 00:13:27,900 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:27,900 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:27,901 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-12 00:13:27,901 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2023-11-12 00:13:27,902 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:27,902 INFO L85 PathProgramCache]: Analyzing trace with hash 27741938, now seen corresponding path program 1 times [2023-11-12 00:13:27,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:27,903 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1635559551] [2023-11-12 00:13:27,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:27,903 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:27,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:28,019 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:28,019 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:28,020 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1635559551] [2023-11-12 00:13:28,020 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1635559551] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:28,020 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:28,020 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:13:28,020 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039727046] [2023-11-12 00:13:28,021 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:28,021 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:13:28,021 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:28,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:13:28,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:13:28,022 INFO L87 Difference]: Start difference. First operand 357 states and 494 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 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) [2023-11-12 00:13:28,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:28,295 INFO L93 Difference]: Finished difference Result 352 states and 489 transitions. [2023-11-12 00:13:28,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:13:28,295 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 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 8 [2023-11-12 00:13:28,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:28,298 INFO L225 Difference]: With dead ends: 352 [2023-11-12 00:13:28,298 INFO L226 Difference]: Without dead ends: 352 [2023-11-12 00:13:28,299 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 [2023-11-12 00:13:28,300 INFO L413 NwaCegarLoop]: 259 mSDtfsCounter, 34 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 183 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 410 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:28,301 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 410 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 183 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:13:28,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2023-11-12 00:13:28,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 352. [2023-11-12 00:13:28,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 352 states, 204 states have (on average 2.2598039215686274) internal successors, (461), 338 states have internal predecessors, (461), 14 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-12 00:13:28,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 489 transitions. [2023-11-12 00:13:28,313 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 489 transitions. Word has length 8 [2023-11-12 00:13:28,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:28,314 INFO L495 AbstractCegarLoop]: Abstraction has 352 states and 489 transitions. [2023-11-12 00:13:28,314 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 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) [2023-11-12 00:13:28,314 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 489 transitions. [2023-11-12 00:13:28,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-12 00:13:28,315 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:28,315 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:28,315 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-12 00:13:28,315 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2023-11-12 00:13:28,316 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:28,316 INFO L85 PathProgramCache]: Analyzing trace with hash 860000475, now seen corresponding path program 1 times [2023-11-12 00:13:28,316 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:28,317 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934368027] [2023-11-12 00:13:28,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:28,317 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:28,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:28,470 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:28,471 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:28,471 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934368027] [2023-11-12 00:13:28,471 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1934368027] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:28,471 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:28,472 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 00:13:28,472 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667484551] [2023-11-12 00:13:28,472 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:28,472 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-12 00:13:28,473 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:28,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-12 00:13:28,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:13:28,474 INFO L87 Difference]: Start difference. First operand 352 states and 489 transitions. Second operand has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 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) [2023-11-12 00:13:29,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:29,165 INFO L93 Difference]: Finished difference Result 475 states and 526 transitions. [2023-11-12 00:13:29,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:13:29,165 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 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 9 [2023-11-12 00:13:29,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:29,168 INFO L225 Difference]: With dead ends: 475 [2023-11-12 00:13:29,169 INFO L226 Difference]: Without dead ends: 475 [2023-11-12 00:13:29,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:13:29,170 INFO L413 NwaCegarLoop]: 145 mSDtfsCounter, 288 mSDsluCounter, 485 mSDsCounter, 0 mSdLazyCounter, 762 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 288 SdHoareTripleChecker+Valid, 630 SdHoareTripleChecker+Invalid, 798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 762 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:29,170 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [288 Valid, 630 Invalid, 798 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 762 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-12 00:13:29,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 475 states. [2023-11-12 00:13:29,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 475 to 344. [2023-11-12 00:13:29,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 204 states have (on average 2.2205882352941178) internal successors, (453), 330 states have internal predecessors, (453), 14 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-12 00:13:29,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 481 transitions. [2023-11-12 00:13:29,183 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 481 transitions. Word has length 9 [2023-11-12 00:13:29,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:29,183 INFO L495 AbstractCegarLoop]: Abstraction has 344 states and 481 transitions. [2023-11-12 00:13:29,183 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 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) [2023-11-12 00:13:29,184 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 481 transitions. [2023-11-12 00:13:29,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-12 00:13:29,184 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:29,184 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:29,184 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-12 00:13:29,185 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2023-11-12 00:13:29,185 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:29,185 INFO L85 PathProgramCache]: Analyzing trace with hash 860000476, now seen corresponding path program 1 times [2023-11-12 00:13:29,185 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:29,186 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [484574671] [2023-11-12 00:13:29,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:29,186 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:29,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:29,413 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:29,414 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:29,414 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [484574671] [2023-11-12 00:13:29,414 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [484574671] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:29,414 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:29,414 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 00:13:29,415 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381304551] [2023-11-12 00:13:29,415 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:29,415 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-12 00:13:29,415 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:29,416 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-12 00:13:29,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:13:29,416 INFO L87 Difference]: Start difference. First operand 344 states and 481 transitions. Second operand has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 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) [2023-11-12 00:13:30,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:30,276 INFO L93 Difference]: Finished difference Result 465 states and 516 transitions. [2023-11-12 00:13:30,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:13:30,278 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 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 9 [2023-11-12 00:13:30,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:30,281 INFO L225 Difference]: With dead ends: 465 [2023-11-12 00:13:30,281 INFO L226 Difference]: Without dead ends: 465 [2023-11-12 00:13:30,282 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:13:30,283 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 734 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 787 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 734 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 839 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 787 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:30,283 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [734 Valid, 306 Invalid, 839 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 787 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-12 00:13:30,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2023-11-12 00:13:30,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 335. [2023-11-12 00:13:30,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 204 states have (on average 2.1715686274509802) internal successors, (443), 321 states have internal predecessors, (443), 14 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-12 00:13:30,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 471 transitions. [2023-11-12 00:13:30,301 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 471 transitions. Word has length 9 [2023-11-12 00:13:30,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:30,301 INFO L495 AbstractCegarLoop]: Abstraction has 335 states and 471 transitions. [2023-11-12 00:13:30,301 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 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) [2023-11-12 00:13:30,301 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 471 transitions. [2023-11-12 00:13:30,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-12 00:13:30,302 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:30,302 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:30,302 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-12 00:13:30,303 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2023-11-12 00:13:30,303 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:30,303 INFO L85 PathProgramCache]: Analyzing trace with hash -1830426323, now seen corresponding path program 1 times [2023-11-12 00:13:30,303 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:30,303 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [669154603] [2023-11-12 00:13:30,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:30,321 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:30,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:30,796 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:30,796 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:30,796 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [669154603] [2023-11-12 00:13:30,796 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [669154603] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:30,797 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:30,797 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-12 00:13:30,797 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412953781] [2023-11-12 00:13:30,797 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:30,798 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:13:30,798 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:30,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:13:30,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:13:30,799 INFO L87 Difference]: Start difference. First operand 335 states and 471 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 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) [2023-11-12 00:13:31,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:31,337 INFO L93 Difference]: Finished difference Result 352 states and 491 transitions. [2023-11-12 00:13:31,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-12 00:13:31,337 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 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 16 [2023-11-12 00:13:31,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:31,340 INFO L225 Difference]: With dead ends: 352 [2023-11-12 00:13:31,340 INFO L226 Difference]: Without dead ends: 352 [2023-11-12 00:13:31,341 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2023-11-12 00:13:31,345 INFO L413 NwaCegarLoop]: 252 mSDtfsCounter, 20 mSDsluCounter, 761 mSDsCounter, 0 mSdLazyCounter, 469 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 1013 SdHoareTripleChecker+Invalid, 476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 469 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:31,345 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 1013 Invalid, 476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 469 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-12 00:13:31,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2023-11-12 00:13:31,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 342. [2023-11-12 00:13:31,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 210 states have (on average 2.142857142857143) internal successors, (450), 327 states have internal predecessors, (450), 15 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2023-11-12 00:13:31,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 480 transitions. [2023-11-12 00:13:31,366 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 480 transitions. Word has length 16 [2023-11-12 00:13:31,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:31,366 INFO L495 AbstractCegarLoop]: Abstraction has 342 states and 480 transitions. [2023-11-12 00:13:31,366 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 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) [2023-11-12 00:13:31,367 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 480 transitions. [2023-11-12 00:13:31,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-12 00:13:31,368 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:31,368 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:31,369 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-12 00:13:31,369 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2023-11-12 00:13:31,369 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:31,370 INFO L85 PathProgramCache]: Analyzing trace with hash -571852452, now seen corresponding path program 1 times [2023-11-12 00:13:31,370 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:31,370 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977343745] [2023-11-12 00:13:31,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:31,371 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:31,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:31,925 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:31,925 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:31,926 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977343745] [2023-11-12 00:13:31,926 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [977343745] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:31,926 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:31,926 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-12 00:13:31,926 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298528671] [2023-11-12 00:13:31,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:31,927 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-12 00:13:31,927 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:31,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-12 00:13:31,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2023-11-12 00:13:31,928 INFO L87 Difference]: Start difference. First operand 342 states and 480 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 7 states have internal predecessors, (16), 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) [2023-11-12 00:13:32,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:32,890 INFO L93 Difference]: Finished difference Result 476 states and 529 transitions. [2023-11-12 00:13:32,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-12 00:13:32,890 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 7 states have internal predecessors, (16), 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 17 [2023-11-12 00:13:32,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:32,893 INFO L225 Difference]: With dead ends: 476 [2023-11-12 00:13:32,893 INFO L226 Difference]: Without dead ends: 476 [2023-11-12 00:13:32,894 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2023-11-12 00:13:32,895 INFO L413 NwaCegarLoop]: 163 mSDtfsCounter, 686 mSDsluCounter, 878 mSDsCounter, 0 mSdLazyCounter, 995 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 700 SdHoareTripleChecker+Valid, 1041 SdHoareTripleChecker+Invalid, 1002 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 995 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:32,895 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [700 Valid, 1041 Invalid, 1002 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 995 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-12 00:13:32,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476 states. [2023-11-12 00:13:32,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476 to 344. [2023-11-12 00:13:32,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 212 states have (on average 2.1320754716981134) internal successors, (452), 329 states have internal predecessors, (452), 15 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2023-11-12 00:13:32,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 482 transitions. [2023-11-12 00:13:32,907 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 482 transitions. Word has length 17 [2023-11-12 00:13:32,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:32,908 INFO L495 AbstractCegarLoop]: Abstraction has 344 states and 482 transitions. [2023-11-12 00:13:32,908 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 7 states have internal predecessors, (16), 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) [2023-11-12 00:13:32,908 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 482 transitions. [2023-11-12 00:13:32,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-11-12 00:13:32,910 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:32,910 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:32,910 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-12 00:13:32,910 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2023-11-12 00:13:32,911 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:32,911 INFO L85 PathProgramCache]: Analyzing trace with hash 1218114883, now seen corresponding path program 1 times [2023-11-12 00:13:32,911 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:32,911 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [260080138] [2023-11-12 00:13:32,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:32,912 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:32,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:34,255 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:34,255 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:34,255 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [260080138] [2023-11-12 00:13:34,256 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [260080138] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:34,256 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2010754998] [2023-11-12 00:13:34,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:34,256 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:34,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d92f43a-9ab7-4baa-bdd9-c039e091e4de/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:34,260 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d92f43a-9ab7-4baa-bdd9-c039e091e4de/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:34,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d92f43a-9ab7-4baa-bdd9-c039e091e4de/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:13:34,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:34,444 INFO L262 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 45 conjunts are in the unsatisfiable core [2023-11-12 00:13:34,455 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:34,509 INFO L351 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 [2023-11-12 00:13:34,760 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-12 00:13:34,827 INFO L322 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-12 00:13:34,829 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 17 [2023-11-12 00:13:34,843 INFO L351 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 7 treesize of output 3 [2023-11-12 00:13:34,915 INFO L322 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-12 00:13:34,915 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 21 [2023-11-12 00:13:35,010 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-12 00:13:35,019 INFO L322 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-11-12 00:13:35,019 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 29 treesize of output 28 [2023-11-12 00:13:35,242 INFO L322 Elim1Store]: treesize reduction 58, result has 34.8 percent of original size [2023-11-12 00:13:35,243 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 30 treesize of output 40 [2023-11-12 00:13:35,338 INFO L351 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 40 treesize of output 31 [2023-11-12 00:13:35,556 INFO L351 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 40 treesize of output 31 [2023-11-12 00:13:35,599 INFO L351 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 40 treesize of output 31 [2023-11-12 00:13:35,680 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-12 00:13:35,681 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 13 [2023-11-12 00:13:35,734 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:35,735 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:13:35,775 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_289 (Array Int Int))) (= (select |c_#valid| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_289) c_append_~head.base) (+ c_append_~head.offset 4))) 1)) is different from false [2023-11-12 00:13:36,174 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 00:13:36,174 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 34 [2023-11-12 00:13:36,190 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 00:13:36,191 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 332 treesize of output 214 [2023-11-12 00:13:36,203 INFO L351 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 41 treesize of output 37 [2023-11-12 00:13:36,213 INFO L351 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 44 treesize of output 36 [2023-11-12 00:13:36,598 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2010754998] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:36,598 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [872471199] [2023-11-12 00:13:36,619 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-11-12 00:13:36,619 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:13:36,624 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:13:36,630 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:13:36,630 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:13:37,728 INFO L197 IcfgInterpreter]: Interpreting procedure append with input of size 266 for LOIs [2023-11-12 00:13:42,051 INFO L180 IcfgInterpreter]: Interpretation finished