./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/memsafety-ext2/split_list_test05-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version dbf71c69 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/bin/utaipan-G1rejxKTta/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/bin/utaipan-G1rejxKTta/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/bin/utaipan-G1rejxKTta/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/bin/utaipan-G1rejxKTta/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety-ext2/split_list_test05-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/bin/utaipan-G1rejxKTta/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/bin/utaipan-G1rejxKTta --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash db322df1d89bf1549765f136e3e3b8000484c0c3108c31998992cf725d6dcc20 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-dbf71c6-m [2022-10-17 17:21:43,912 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-10-17 17:21:43,914 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-10-17 17:21:43,969 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-10-17 17:21:43,972 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-10-17 17:21:43,979 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-10-17 17:21:43,982 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-10-17 17:21:43,986 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-10-17 17:21:43,988 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-10-17 17:21:43,994 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-10-17 17:21:43,996 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-10-17 17:21:43,999 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-10-17 17:21:43,999 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-10-17 17:21:44,002 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-10-17 17:21:44,004 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-10-17 17:21:44,007 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-10-17 17:21:44,009 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-10-17 17:21:44,010 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-10-17 17:21:44,013 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-10-17 17:21:44,019 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-10-17 17:21:44,021 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-10-17 17:21:44,022 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-10-17 17:21:44,026 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-10-17 17:21:44,027 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-10-17 17:21:44,039 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-10-17 17:21:44,039 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-10-17 17:21:44,040 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-10-17 17:21:44,042 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-10-17 17:21:44,042 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-10-17 17:21:44,044 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-10-17 17:21:44,044 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-10-17 17:21:44,046 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-10-17 17:21:44,048 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-10-17 17:21:44,049 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-10-17 17:21:44,052 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-10-17 17:21:44,052 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-10-17 17:21:44,053 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-10-17 17:21:44,054 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-10-17 17:21:44,054 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-10-17 17:21:44,055 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-10-17 17:21:44,056 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-10-17 17:21:44,057 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/bin/utaipan-G1rejxKTta/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-10-17 17:21:44,105 INFO L113 SettingsManager]: Loading preferences was successful [2022-10-17 17:21:44,105 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-10-17 17:21:44,106 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-10-17 17:21:44,106 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-10-17 17:21:44,107 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-10-17 17:21:44,107 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-10-17 17:21:44,107 INFO L138 SettingsManager]: * User list type=DISABLED [2022-10-17 17:21:44,108 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-10-17 17:21:44,108 INFO L138 SettingsManager]: * Explicit value domain=true [2022-10-17 17:21:44,108 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-10-17 17:21:44,109 INFO L138 SettingsManager]: * Octagon Domain=false [2022-10-17 17:21:44,109 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-10-17 17:21:44,110 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-10-17 17:21:44,110 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-10-17 17:21:44,110 INFO L138 SettingsManager]: * Interval Domain=false [2022-10-17 17:21:44,110 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-10-17 17:21:44,111 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-10-17 17:21:44,111 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-10-17 17:21:44,112 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-10-17 17:21:44,112 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-10-17 17:21:44,112 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-10-17 17:21:44,112 INFO L138 SettingsManager]: * sizeof long=4 [2022-10-17 17:21:44,113 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-10-17 17:21:44,113 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-10-17 17:21:44,113 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-10-17 17:21:44,113 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-10-17 17:21:44,113 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-10-17 17:21:44,114 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-10-17 17:21:44,114 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-10-17 17:21:44,114 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-10-17 17:21:44,114 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-10-17 17:21:44,115 INFO L138 SettingsManager]: * sizeof long double=12 [2022-10-17 17:21:44,115 INFO L138 SettingsManager]: * Use constant arrays=true [2022-10-17 17:21:44,115 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-10-17 17:21:44,115 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-10-17 17:21:44,117 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:21:44,125 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-10-17 17:21:44,125 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-10-17 17:21:44,125 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-10-17 17:21:44,126 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-10-17 17:21:44,126 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-10-17 17:21:44,126 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-10-17 17:21:44,126 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/bin/utaipan-G1rejxKTta/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/bin/utaipan-G1rejxKTta Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> db322df1d89bf1549765f136e3e3b8000484c0c3108c31998992cf725d6dcc20 [2022-10-17 17:21:44,404 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-10-17 17:21:44,426 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-10-17 17:21:44,429 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-10-17 17:21:44,430 INFO L271 PluginConnector]: Initializing CDTParser... [2022-10-17 17:21:44,431 INFO L275 PluginConnector]: CDTParser initialized [2022-10-17 17:21:44,432 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/bin/utaipan-G1rejxKTta/../../sv-benchmarks/c/memsafety-ext2/split_list_test05-2.i [2022-10-17 17:21:44,498 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/bin/utaipan-G1rejxKTta/data/94542fb49/4478903c51ca4349ac6836bd40392161/FLAGccefe0d75 [2022-10-17 17:21:45,182 INFO L306 CDTParser]: Found 1 translation units. [2022-10-17 17:21:45,182 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/sv-benchmarks/c/memsafety-ext2/split_list_test05-2.i [2022-10-17 17:21:45,199 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/bin/utaipan-G1rejxKTta/data/94542fb49/4478903c51ca4349ac6836bd40392161/FLAGccefe0d75 [2022-10-17 17:21:45,423 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/bin/utaipan-G1rejxKTta/data/94542fb49/4478903c51ca4349ac6836bd40392161 [2022-10-17 17:21:45,426 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-10-17 17:21:45,428 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-10-17 17:21:45,429 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-10-17 17:21:45,429 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-10-17 17:21:45,436 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-10-17 17:21:45,437 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:21:45" (1/1) ... [2022-10-17 17:21:45,438 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@31ee598e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:45, skipping insertion in model container [2022-10-17 17:21:45,438 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:21:45" (1/1) ... [2022-10-17 17:21:45,447 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-10-17 17:21:45,520 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-10-17 17:21:45,904 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:21:45,916 INFO L203 MainTranslator]: Completed pre-run [2022-10-17 17:21:45,979 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:21:46,009 INFO L208 MainTranslator]: Completed translation [2022-10-17 17:21:46,010 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:46 WrapperNode [2022-10-17 17:21:46,010 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-10-17 17:21:46,011 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-10-17 17:21:46,012 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-10-17 17:21:46,012 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-10-17 17:21:46,020 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:46" (1/1) ... [2022-10-17 17:21:46,038 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:46" (1/1) ... [2022-10-17 17:21:46,098 INFO L138 Inliner]: procedures = 125, calls = 95, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 302 [2022-10-17 17:21:46,099 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-10-17 17:21:46,099 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-10-17 17:21:46,100 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-10-17 17:21:46,100 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-10-17 17:21:46,112 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:46" (1/1) ... [2022-10-17 17:21:46,113 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:46" (1/1) ... [2022-10-17 17:21:46,138 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:46" (1/1) ... [2022-10-17 17:21:46,139 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:46" (1/1) ... [2022-10-17 17:21:46,175 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:46" (1/1) ... [2022-10-17 17:21:46,181 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:46" (1/1) ... [2022-10-17 17:21:46,188 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:46" (1/1) ... [2022-10-17 17:21:46,191 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:46" (1/1) ... [2022-10-17 17:21:46,201 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-10-17 17:21:46,206 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-10-17 17:21:46,206 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-10-17 17:21:46,206 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-10-17 17:21:46,207 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:46" (1/1) ... [2022-10-17 17:21:46,215 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:21:46,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:21:46,241 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-10-17 17:21:46,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-10-17 17:21:46,286 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-10-17 17:21:46,286 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-10-17 17:21:46,286 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-10-17 17:21:46,286 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-10-17 17:21:46,286 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-10-17 17:21:46,287 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-10-17 17:21:46,287 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-10-17 17:21:46,287 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-10-17 17:21:46,287 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-10-17 17:21:46,287 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-10-17 17:21:46,287 INFO L130 BoogieDeclarations]: Found specification of procedure append [2022-10-17 17:21:46,288 INFO L138 BoogieDeclarations]: Found implementation of procedure append [2022-10-17 17:21:46,397 INFO L235 CfgBuilder]: Building ICFG [2022-10-17 17:21:46,400 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-10-17 17:21:47,432 INFO L276 CfgBuilder]: Performing block encoding [2022-10-17 17:21:47,536 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-10-17 17:21:47,536 INFO L300 CfgBuilder]: Removed 11 assume(true) statements. [2022-10-17 17:21:47,542 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:21:47 BoogieIcfgContainer [2022-10-17 17:21:47,542 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-10-17 17:21:47,545 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-10-17 17:21:47,545 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-10-17 17:21:47,549 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-10-17 17:21:47,550 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.10 05:21:45" (1/3) ... [2022-10-17 17:21:47,550 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@709ac406 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:21:47, skipping insertion in model container [2022-10-17 17:21:47,551 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:46" (2/3) ... [2022-10-17 17:21:47,551 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@709ac406 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:21:47, skipping insertion in model container [2022-10-17 17:21:47,551 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:21:47" (3/3) ... [2022-10-17 17:21:47,553 INFO L112 eAbstractionObserver]: Analyzing ICFG split_list_test05-2.i [2022-10-17 17:21:47,573 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-10-17 17:21:47,573 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 147 error locations. [2022-10-17 17:21:47,651 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-10-17 17:21:47,662 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;@55b11426, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-10-17 17:21:47,662 INFO L358 AbstractCegarLoop]: Starting to check reachability of 147 error locations. [2022-10-17 17:21:47,670 INFO L276 IsEmpty]: Start isEmpty. Operand has 293 states, 129 states have (on average 2.356589147286822) internal successors, (304), 278 states have internal predecessors, (304), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-10-17 17:21:47,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-10-17 17:21:47,677 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:21:47,678 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-10-17 17:21:47,678 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)] === [2022-10-17 17:21:47,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:21:47,692 INFO L85 PathProgramCache]: Analyzing trace with hash 17550, now seen corresponding path program 1 times [2022-10-17 17:21:47,703 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:21:47,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1612532838] [2022-10-17 17:21:47,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:47,705 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:21:47,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:47,962 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:21:47,963 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:21:47,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1612532838] [2022-10-17 17:21:47,964 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1612532838] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:21:47,964 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:21:47,965 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-10-17 17:21:47,966 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192910800] [2022-10-17 17:21:47,967 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:21:47,972 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:21:47,972 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:21:47,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:21:48,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:21:48,003 INFO L87 Difference]: Start difference. First operand has 293 states, 129 states have (on average 2.356589147286822) internal successors, (304), 278 states have internal predecessors, (304), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) 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) [2022-10-17 17:21:48,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:21:48,519 INFO L93 Difference]: Finished difference Result 499 states and 552 transitions. [2022-10-17 17:21:48,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:21:48,522 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 [2022-10-17 17:21:48,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:21:48,546 INFO L225 Difference]: With dead ends: 499 [2022-10-17 17:21:48,547 INFO L226 Difference]: Without dead ends: 498 [2022-10-17 17:21:48,549 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 [2022-10-17 17:21:48,556 INFO L413 NwaCegarLoop]: 200 mSDtfsCounter, 224 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 224 SdHoareTripleChecker+Valid, 356 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-10-17 17:21:48,557 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [224 Valid, 356 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 291 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-10-17 17:21:48,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 498 states. [2022-10-17 17:21:48,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 498 to 364. [2022-10-17 17:21:48,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 364 states, 203 states have (on average 2.3201970443349755) internal successors, (471), 349 states have internal predecessors, (471), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-10-17 17:21:48,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 501 transitions. [2022-10-17 17:21:48,661 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 501 transitions. Word has length 2 [2022-10-17 17:21:48,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:21:48,662 INFO L495 AbstractCegarLoop]: Abstraction has 364 states and 501 transitions. [2022-10-17 17:21:48,662 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) [2022-10-17 17:21:48,664 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 501 transitions. [2022-10-17 17:21:48,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-10-17 17:21:48,664 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:21:48,664 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-10-17 17:21:48,665 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-10-17 17:21:48,665 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)] === [2022-10-17 17:21:48,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:21:48,666 INFO L85 PathProgramCache]: Analyzing trace with hash 17551, now seen corresponding path program 1 times [2022-10-17 17:21:48,666 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:21:48,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49575122] [2022-10-17 17:21:48,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:48,667 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:21:48,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:48,830 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:21:48,830 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:21:48,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [49575122] [2022-10-17 17:21:48,832 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [49575122] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:21:48,832 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:21:48,832 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-10-17 17:21:48,833 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343399730] [2022-10-17 17:21:48,833 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:21:48,835 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:21:48,835 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:21:48,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:21:48,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:21:48,836 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) [2022-10-17 17:21:49,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:21:49,091 INFO L93 Difference]: Finished difference Result 365 states and 504 transitions. [2022-10-17 17:21:49,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:21:49,092 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 [2022-10-17 17:21:49,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:21:49,095 INFO L225 Difference]: With dead ends: 365 [2022-10-17 17:21:49,096 INFO L226 Difference]: Without dead ends: 365 [2022-10-17 17:21:49,103 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 [2022-10-17 17:21:49,105 INFO L413 NwaCegarLoop]: 289 mSDtfsCounter, 5 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 453 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-10-17 17:21:49,106 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 453 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 194 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-10-17 17:21:49,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2022-10-17 17:21:49,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 362. [2022-10-17 17:21:49,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 203 states have (on average 2.310344827586207) internal successors, (469), 347 states have internal predecessors, (469), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-10-17 17:21:49,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 499 transitions. [2022-10-17 17:21:49,134 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 499 transitions. Word has length 2 [2022-10-17 17:21:49,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:21:49,140 INFO L495 AbstractCegarLoop]: Abstraction has 362 states and 499 transitions. [2022-10-17 17:21:49,140 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) [2022-10-17 17:21:49,141 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 499 transitions. [2022-10-17 17:21:49,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-10-17 17:21:49,141 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:21:49,141 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:21:49,141 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-10-17 17:21:49,142 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2022-10-17 17:21:49,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:21:49,142 INFO L85 PathProgramCache]: Analyzing trace with hash -268395331, now seen corresponding path program 1 times [2022-10-17 17:21:49,142 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:21:49,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955065638] [2022-10-17 17:21:49,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:49,143 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:21:49,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:49,252 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:21:49,252 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:21:49,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955065638] [2022-10-17 17:21:49,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1955065638] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:21:49,253 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:21:49,253 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-10-17 17:21:49,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142020660] [2022-10-17 17:21:49,254 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:21:49,254 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:21:49,254 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:21:49,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:21:49,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:21:49,256 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) [2022-10-17 17:21:49,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:21:49,485 INFO L93 Difference]: Finished difference Result 357 states and 494 transitions. [2022-10-17 17:21:49,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:21:49,485 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 [2022-10-17 17:21:49,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:21:49,491 INFO L225 Difference]: With dead ends: 357 [2022-10-17 17:21:49,491 INFO L226 Difference]: Without dead ends: 357 [2022-10-17 17:21:49,491 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:21:49,499 INFO L413 NwaCegarLoop]: 262 mSDtfsCounter, 39 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 404 SdHoareTripleChecker+Invalid, 198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-10-17 17:21:49,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 404 Invalid, 198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 194 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-10-17 17:21:49,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2022-10-17 17:21:49,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 357. [2022-10-17 17:21:49,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 357 states, 203 states have (on average 2.2857142857142856) internal successors, (464), 342 states have internal predecessors, (464), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-10-17 17:21:49,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 494 transitions. [2022-10-17 17:21:49,516 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 494 transitions. Word has length 8 [2022-10-17 17:21:49,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:21:49,517 INFO L495 AbstractCegarLoop]: Abstraction has 357 states and 494 transitions. [2022-10-17 17:21:49,517 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) [2022-10-17 17:21:49,517 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 494 transitions. [2022-10-17 17:21:49,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-10-17 17:21:49,518 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:21:49,518 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:21:49,518 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-10-17 17:21:49,519 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2022-10-17 17:21:49,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:21:49,520 INFO L85 PathProgramCache]: Analyzing trace with hash -268395330, now seen corresponding path program 1 times [2022-10-17 17:21:49,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:21:49,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342057899] [2022-10-17 17:21:49,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:49,521 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:21:49,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:49,679 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:21:49,679 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:21:49,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1342057899] [2022-10-17 17:21:49,680 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1342057899] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:21:49,680 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:21:49,682 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-10-17 17:21:49,682 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085652070] [2022-10-17 17:21:49,682 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:21:49,683 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:21:49,683 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:21:49,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:21:49,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:21:49,684 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) [2022-10-17 17:21:49,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:21:49,970 INFO L93 Difference]: Finished difference Result 352 states and 489 transitions. [2022-10-17 17:21:49,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:21:49,971 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 [2022-10-17 17:21:49,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:21:49,973 INFO L225 Difference]: With dead ends: 352 [2022-10-17 17:21:49,973 INFO L226 Difference]: Without dead ends: 352 [2022-10-17 17:21:49,973 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:21:49,974 INFO L413 NwaCegarLoop]: 262 mSDtfsCounter, 34 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 415 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-10-17 17:21:49,975 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 415 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 178 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-10-17 17:21:49,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2022-10-17 17:21:49,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 352. [2022-10-17 17:21:49,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 352 states, 203 states have (on average 2.2610837438423643) internal successors, (459), 337 states have internal predecessors, (459), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-10-17 17:21:49,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 489 transitions. [2022-10-17 17:21:49,986 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 489 transitions. Word has length 8 [2022-10-17 17:21:49,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:21:49,987 INFO L495 AbstractCegarLoop]: Abstraction has 352 states and 489 transitions. [2022-10-17 17:21:49,987 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) [2022-10-17 17:21:49,987 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 489 transitions. [2022-10-17 17:21:49,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-10-17 17:21:49,988 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:21:49,988 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:21:49,988 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-10-17 17:21:49,988 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2022-10-17 17:21:49,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:21:49,989 INFO L85 PathProgramCache]: Analyzing trace with hash 269679752, now seen corresponding path program 1 times [2022-10-17 17:21:49,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:21:49,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75011175] [2022-10-17 17:21:49,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:49,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:21:50,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:50,141 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:21:50,141 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:21:50,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75011175] [2022-10-17 17:21:50,141 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [75011175] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:21:50,141 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:21:50,141 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-10-17 17:21:50,142 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718900473] [2022-10-17 17:21:50,142 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:21:50,142 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-10-17 17:21:50,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:21:50,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-10-17 17:21:50,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-10-17 17:21:50,143 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) [2022-10-17 17:21:50,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:21:50,710 INFO L93 Difference]: Finished difference Result 475 states and 526 transitions. [2022-10-17 17:21:50,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-10-17 17:21:50,714 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 [2022-10-17 17:21:50,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:21:50,717 INFO L225 Difference]: With dead ends: 475 [2022-10-17 17:21:50,717 INFO L226 Difference]: Without dead ends: 475 [2022-10-17 17:21:50,718 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 [2022-10-17 17:21:50,719 INFO L413 NwaCegarLoop]: 147 mSDtfsCounter, 289 mSDsluCounter, 515 mSDsCounter, 0 mSdLazyCounter, 757 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 289 SdHoareTripleChecker+Valid, 633 SdHoareTripleChecker+Invalid, 795 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 757 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-10-17 17:21:50,719 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [289 Valid, 633 Invalid, 795 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 757 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-10-17 17:21:50,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 475 states. [2022-10-17 17:21:50,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 475 to 344. [2022-10-17 17:21:50,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 203 states have (on average 2.2216748768472905) internal successors, (451), 329 states have internal predecessors, (451), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-10-17 17:21:50,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 481 transitions. [2022-10-17 17:21:50,733 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 481 transitions. Word has length 9 [2022-10-17 17:21:50,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:21:50,733 INFO L495 AbstractCegarLoop]: Abstraction has 344 states and 481 transitions. [2022-10-17 17:21:50,734 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) [2022-10-17 17:21:50,734 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 481 transitions. [2022-10-17 17:21:50,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-10-17 17:21:50,734 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:21:50,734 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:21:50,735 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-10-17 17:21:50,735 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2022-10-17 17:21:50,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:21:50,736 INFO L85 PathProgramCache]: Analyzing trace with hash 269679753, now seen corresponding path program 1 times [2022-10-17 17:21:50,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:21:50,737 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [812330880] [2022-10-17 17:21:50,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:50,737 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:21:50,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:51,057 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:21:51,057 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:21:51,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [812330880] [2022-10-17 17:21:51,057 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [812330880] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:21:51,057 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:21:51,058 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-10-17 17:21:51,058 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848825993] [2022-10-17 17:21:51,058 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:21:51,059 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-10-17 17:21:51,059 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:21:51,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-10-17 17:21:51,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-10-17 17:21:51,060 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) [2022-10-17 17:21:51,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:21:51,808 INFO L93 Difference]: Finished difference Result 465 states and 516 transitions. [2022-10-17 17:21:51,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-10-17 17:21:51,808 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 [2022-10-17 17:21:51,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:21:51,812 INFO L225 Difference]: With dead ends: 465 [2022-10-17 17:21:51,812 INFO L226 Difference]: Without dead ends: 465 [2022-10-17 17:21:51,812 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 [2022-10-17 17:21:51,813 INFO L413 NwaCegarLoop]: 95 mSDtfsCounter, 730 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 783 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 730 SdHoareTripleChecker+Valid, 308 SdHoareTripleChecker+Invalid, 844 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 783 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-10-17 17:21:51,814 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [730 Valid, 308 Invalid, 844 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 783 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-10-17 17:21:51,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2022-10-17 17:21:51,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 335. [2022-10-17 17:21:51,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 203 states have (on average 2.1724137931034484) internal successors, (441), 320 states have internal predecessors, (441), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-10-17 17:21:51,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 471 transitions. [2022-10-17 17:21:51,843 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 471 transitions. Word has length 9 [2022-10-17 17:21:51,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:21:51,844 INFO L495 AbstractCegarLoop]: Abstraction has 335 states and 471 transitions. [2022-10-17 17:21:51,844 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) [2022-10-17 17:21:51,844 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 471 transitions. [2022-10-17 17:21:51,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-10-17 17:21:51,845 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:21:51,845 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:21:51,845 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-10-17 17:21:51,845 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting appendErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2022-10-17 17:21:51,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:21:51,846 INFO L85 PathProgramCache]: Analyzing trace with hash 2120301909, now seen corresponding path program 1 times [2022-10-17 17:21:51,846 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:21:51,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793929869] [2022-10-17 17:21:51,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:51,847 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:21:51,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:52,317 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:21:52,318 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:21:52,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793929869] [2022-10-17 17:21:52,318 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [793929869] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:21:52,318 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:21:52,318 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-10-17 17:21:52,318 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322575717] [2022-10-17 17:21:52,319 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:21:52,319 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-10-17 17:21:52,319 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:21:52,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-10-17 17:21:52,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-10-17 17:21:52,320 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) [2022-10-17 17:21:52,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:21:52,740 INFO L93 Difference]: Finished difference Result 352 states and 491 transitions. [2022-10-17 17:21:52,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-10-17 17:21:52,741 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 [2022-10-17 17:21:52,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:21:52,743 INFO L225 Difference]: With dead ends: 352 [2022-10-17 17:21:52,744 INFO L226 Difference]: Without dead ends: 352 [2022-10-17 17:21:52,744 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 [2022-10-17 17:21:52,745 INFO L413 NwaCegarLoop]: 256 mSDtfsCounter, 18 mSDsluCounter, 830 mSDsCounter, 0 mSdLazyCounter, 470 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 1017 SdHoareTripleChecker+Invalid, 480 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 470 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-10-17 17:21:52,745 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 1017 Invalid, 480 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 470 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-10-17 17:21:52,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2022-10-17 17:21:52,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 342. [2022-10-17 17:21:52,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 209 states have (on average 2.1435406698564594) internal successors, (448), 326 states have internal predecessors, (448), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2022-10-17 17:21:52,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 480 transitions. [2022-10-17 17:21:52,759 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 480 transitions. Word has length 16 [2022-10-17 17:21:52,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:21:52,759 INFO L495 AbstractCegarLoop]: Abstraction has 342 states and 480 transitions. [2022-10-17 17:21:52,759 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) [2022-10-17 17:21:52,760 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 480 transitions. [2022-10-17 17:21:52,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-10-17 17:21:52,760 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:21:52,760 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:21:52,761 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-10-17 17:21:52,761 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting appendErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2022-10-17 17:21:52,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:21:52,762 INFO L85 PathProgramCache]: Analyzing trace with hash 749666084, now seen corresponding path program 1 times [2022-10-17 17:21:52,762 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:21:52,762 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [787244906] [2022-10-17 17:21:52,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:52,762 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:21:52,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:53,304 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:21:53,304 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:21:53,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [787244906] [2022-10-17 17:21:53,305 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [787244906] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:21:53,305 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:21:53,305 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-10-17 17:21:53,305 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267785702] [2022-10-17 17:21:53,306 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:21:53,306 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-10-17 17:21:53,306 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:21:53,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-10-17 17:21:53,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-10-17 17:21:53,308 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) [2022-10-17 17:21:54,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:21:54,153 INFO L93 Difference]: Finished difference Result 476 states and 529 transitions. [2022-10-17 17:21:54,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-10-17 17:21:54,153 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 [2022-10-17 17:21:54,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:21:54,156 INFO L225 Difference]: With dead ends: 476 [2022-10-17 17:21:54,156 INFO L226 Difference]: Without dead ends: 476 [2022-10-17 17:21:54,157 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 [2022-10-17 17:21:54,158 INFO L413 NwaCegarLoop]: 167 mSDtfsCounter, 683 mSDsluCounter, 893 mSDsCounter, 0 mSdLazyCounter, 1037 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 698 SdHoareTripleChecker+Valid, 1005 SdHoareTripleChecker+Invalid, 1053 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1037 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-10-17 17:21:54,158 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [698 Valid, 1005 Invalid, 1053 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 1037 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-10-17 17:21:54,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476 states. [2022-10-17 17:21:54,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476 to 344. [2022-10-17 17:21:54,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 211 states have (on average 2.132701421800948) internal successors, (450), 328 states have internal predecessors, (450), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2022-10-17 17:21:54,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 482 transitions. [2022-10-17 17:21:54,173 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 482 transitions. Word has length 17 [2022-10-17 17:21:54,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:21:54,173 INFO L495 AbstractCegarLoop]: Abstraction has 344 states and 482 transitions. [2022-10-17 17:21:54,175 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) [2022-10-17 17:21:54,176 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 482 transitions. [2022-10-17 17:21:54,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-10-17 17:21:54,177 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:21:54,178 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] [2022-10-17 17:21:54,178 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-10-17 17:21:54,179 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting appendErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 144 more)] === [2022-10-17 17:21:54,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:21:54,179 INFO L85 PathProgramCache]: Analyzing trace with hash 1443652774, now seen corresponding path program 1 times [2022-10-17 17:21:54,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:21:54,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1736400439] [2022-10-17 17:21:54,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:54,180 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:21:54,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:58,163 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:21:58,163 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:21:58,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1736400439] [2022-10-17 17:21:58,164 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1736400439] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:21:58,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [619141124] [2022-10-17 17:21:58,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:58,164 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:21:58,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:21:58,169 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:21:58,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_099e060e-a946-4709-8ffd-bfe51a3ad354/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-10-17 17:21:58,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:58,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 66 conjunts are in the unsatisfiable core [2022-10-17 17:21:58,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:21:58,357 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-10-17 17:21:58,687 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-10-17 17:21:58,697 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-10-17 17:21:58,792 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-10-17 17:21:58,792 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 22 [2022-10-17 17:21:58,808 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-10-17 17:21:58,830 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-10-17 17:21:58,831 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 22 [2022-10-17 17:21:58,843 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-10-17 17:21:58,954 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-10-17 17:21:58,955 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 26 [2022-10-17 17:21:58,976 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-10-17 17:21:58,977 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 26 [2022-10-17 17:21:59,187 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:21:59,195 INFO L356 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2022-10-17 17:21:59,196 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 29 treesize of output 28 [2022-10-17 17:21:59,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:59,448 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-10-17 17:21:59,468 INFO L356 Elim1Store]: treesize reduction 8, result has 65.2 percent of original size [2022-10-17 17:21:59,469 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 24 [2022-10-17 17:21:59,605 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 44 [2022-10-17 17:21:59,614 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 35 [2022-10-17 17:21:59,848 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 44 [2022-10-17 17:21:59,856 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 35 [2022-10-17 17:21:59,895 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 44 [2022-10-17 17:21:59,903 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 35 [2022-10-17 17:22:00,020 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:22:00,021 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 21 [2022-10-17 17:22:00,029 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:22:00,030 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 14 [2022-10-17 17:22:00,105 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:22:00,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:22:00,253 WARN L833 $PredicateComparison]: unable to prove that (let ((.cse0 (+ c_append_~head.offset 4))) (and (forall ((v_ArrVal_297 (Array Int Int))) (<= 0 (+ (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_297) c_append_~head.base) .cse0) 5))) (forall ((v_ArrVal_298 (Array Int Int)) (v_ArrVal_297 (Array Int Int))) (<= (+ (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_297) c_append_~head.base) .cse0) 9) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_298) c_append_~head.base) .cse0)))))) is different from false [2022-10-17 17:22:05,141 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-10-17 17:22:05,141 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 116 treesize of output 117 [2022-10-17 17:22:05,158 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-10-17 17:22:05,159 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 127 [2022-10-17 17:22:05,185 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-10-17 17:22:05,186 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 289 treesize of output 219 [2022-10-17 17:22:05,218 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-10-17 17:22:05,219 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 556 treesize of output 538 [2022-10-17 17:22:05,283 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-10-17 17:22:05,283 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 846 treesize of output 836 [2022-10-17 17:22:05,320 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 798 treesize of output 722 [2022-10-17 17:22:05,363 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 693 treesize of output 629 [2022-10-17 17:22:05,409 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-10-17 17:22:05,410 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 629 treesize of output 602 [2022-10-17 17:22:05,442 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 630 treesize of output 586 [2022-10-17 17:22:05,475 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 561 treesize of output 553