./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/dll2n_append_unequal.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/dll2n_append_unequal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 8e4e2611155a39995b0fc64ec45d64e4c98f789d2737326ee819380629347be0 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:21:01,816 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:21:01,910 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-23 21:21:01,918 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:21:01,919 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:21:01,952 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:21:01,953 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:21:01,954 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:21:01,955 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:21:01,956 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:21:01,957 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:21:01,958 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:21:01,959 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:21:01,960 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:21:01,960 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:21:01,961 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:21:01,962 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:21:01,963 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:21:01,963 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:21:01,964 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:21:01,965 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:21:01,973 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:21:01,974 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-23 21:21:01,975 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-23 21:21:01,976 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:21:01,977 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:21:01,978 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:21:01,979 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:21:01,979 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:21:01,980 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-23 21:21:01,982 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-23 21:21:01,982 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-23 21:21:01,983 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:21:01,983 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-23 21:21:01,984 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-23 21:21:01,984 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:21:01,984 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:21:01,985 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:21:01,985 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:21:01,986 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:21:01,986 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:21:01,987 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:21:01,987 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:21:01,988 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:21:01,989 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:21:01,989 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:21:01,989 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:21:01,990 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:21:01,991 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8e4e2611155a39995b0fc64ec45d64e4c98f789d2737326ee819380629347be0 [2023-11-23 21:21:02,319 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:21:02,345 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:21:02,348 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:21:02,349 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:21:02,350 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:21:02,352 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/list-simple/dll2n_append_unequal.i [2023-11-23 21:21:05,885 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:21:06,255 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:21:06,255 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/sv-benchmarks/c/list-simple/dll2n_append_unequal.i [2023-11-23 21:21:06,279 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/data/afaabe52c/b60ad67b94a844f1a68e5a97852fbf09/FLAG793821d4e [2023-11-23 21:21:06,305 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/data/afaabe52c/b60ad67b94a844f1a68e5a97852fbf09 [2023-11-23 21:21:06,308 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:21:06,310 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:21:06,312 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:21:06,312 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:21:06,319 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:21:06,320 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:21:06" (1/1) ... [2023-11-23 21:21:06,321 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@542e84c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:06, skipping insertion in model container [2023-11-23 21:21:06,322 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:21:06" (1/1) ... [2023-11-23 21:21:06,379 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:21:06,780 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:21:06,797 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:21:06,860 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:21:06,906 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:21:06,907 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:06 WrapperNode [2023-11-23 21:21:06,907 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:21:06,909 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:21:06,909 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:21:06,910 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:21:06,919 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:06" (1/1) ... [2023-11-23 21:21:06,962 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:06" (1/1) ... [2023-11-23 21:21:07,014 INFO L138 Inliner]: procedures = 127, calls = 41, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 146 [2023-11-23 21:21:07,015 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:21:07,016 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:21:07,016 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:21:07,017 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:21:07,029 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:06" (1/1) ... [2023-11-23 21:21:07,029 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:06" (1/1) ... [2023-11-23 21:21:07,053 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:06" (1/1) ... [2023-11-23 21:21:07,054 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:06" (1/1) ... [2023-11-23 21:21:07,064 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:06" (1/1) ... [2023-11-23 21:21:07,083 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:06" (1/1) ... [2023-11-23 21:21:07,085 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:06" (1/1) ... [2023-11-23 21:21:07,088 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:06" (1/1) ... [2023-11-23 21:21:07,092 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:21:07,093 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:21:07,093 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:21:07,094 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:21:07,095 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:06" (1/1) ... [2023-11-23 21:21:07,102 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:21:07,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:21:07,138 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:21:07,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:21:07,188 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 21:21:07,188 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:21:07,188 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-23 21:21:07,188 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-23 21:21:07,188 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 21:21:07,189 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:21:07,189 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:21:07,189 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-23 21:21:07,190 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-23 21:21:07,190 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:21:07,190 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-23 21:21:07,190 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:21:07,191 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:21:07,191 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:21:07,333 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:21:07,336 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:21:07,786 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:21:07,849 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:21:07,849 INFO L309 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-23 21:21:07,851 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:21:07 BoogieIcfgContainer [2023-11-23 21:21:07,851 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:21:07,854 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:21:07,854 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:21:07,857 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:21:07,858 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:21:06" (1/3) ... [2023-11-23 21:21:07,858 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36dac4e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:21:07, skipping insertion in model container [2023-11-23 21:21:07,859 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:06" (2/3) ... [2023-11-23 21:21:07,859 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36dac4e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:21:07, skipping insertion in model container [2023-11-23 21:21:07,859 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:21:07" (3/3) ... [2023-11-23 21:21:07,861 INFO L112 eAbstractionObserver]: Analyzing ICFG dll2n_append_unequal.i [2023-11-23 21:21:07,880 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:21:07,881 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 47 error locations. [2023-11-23 21:21:07,931 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:21:07,938 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;@7c902977, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:21:07,938 INFO L358 AbstractCegarLoop]: Starting to check reachability of 47 error locations. [2023-11-23 21:21:07,943 INFO L276 IsEmpty]: Start isEmpty. Operand has 98 states, 47 states have (on average 2.297872340425532) internal successors, (108), 94 states have internal predecessors, (108), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:21:07,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-23 21:21:07,951 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:07,951 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-23 21:21:07,952 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 44 more)] === [2023-11-23 21:21:07,958 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:07,958 INFO L85 PathProgramCache]: Analyzing trace with hash -1602042251, now seen corresponding path program 1 times [2023-11-23 21:21:07,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:07,969 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1899750444] [2023-11-23 21:21:07,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:07,970 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:08,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:08,265 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:21:08,266 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:08,266 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1899750444] [2023-11-23 21:21:08,267 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1899750444] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:21:08,267 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:21:08,268 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:21:08,269 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099029073] [2023-11-23 21:21:08,271 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:21:08,275 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:21:08,276 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:08,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:21:08,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:21:08,328 INFO L87 Difference]: Start difference. First operand has 98 states, 47 states have (on average 2.297872340425532) internal successors, (108), 94 states have internal predecessors, (108), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:08,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:08,418 INFO L93 Difference]: Finished difference Result 111 states and 123 transitions. [2023-11-23 21:21:08,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:21:08,421 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-23 21:21:08,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:08,430 INFO L225 Difference]: With dead ends: 111 [2023-11-23 21:21:08,431 INFO L226 Difference]: Without dead ends: 109 [2023-11-23 21:21:08,433 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:21:08,440 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 13 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:08,441 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 186 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:21:08,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2023-11-23 21:21:08,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 96. [2023-11-23 21:21:08,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 46 states have (on average 2.1956521739130435) internal successors, (101), 92 states have internal predecessors, (101), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:21:08,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 105 transitions. [2023-11-23 21:21:08,488 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 105 transitions. Word has length 6 [2023-11-23 21:21:08,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:21:08,489 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 105 transitions. [2023-11-23 21:21:08,489 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:08,489 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 105 transitions. [2023-11-23 21:21:08,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-23 21:21:08,490 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:08,490 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-23 21:21:08,490 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:21:08,490 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 44 more)] === [2023-11-23 21:21:08,491 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:08,491 INFO L85 PathProgramCache]: Analyzing trace with hash -1788653075, now seen corresponding path program 1 times [2023-11-23 21:21:08,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:08,492 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [268889337] [2023-11-23 21:21:08,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:08,492 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:08,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:08,559 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:21:08,560 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:08,560 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [268889337] [2023-11-23 21:21:08,560 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [268889337] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:21:08,560 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:21:08,560 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:21:08,561 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143936976] [2023-11-23 21:21:08,561 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:21:08,562 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:21:08,562 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:08,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:21:08,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:21:08,563 INFO L87 Difference]: Start difference. First operand 96 states and 105 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:08,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:08,661 INFO L93 Difference]: Finished difference Result 93 states and 102 transitions. [2023-11-23 21:21:08,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:21:08,662 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-23 21:21:08,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:08,663 INFO L225 Difference]: With dead ends: 93 [2023-11-23 21:21:08,663 INFO L226 Difference]: Without dead ends: 93 [2023-11-23 21:21:08,664 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:21:08,665 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 6 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:08,666 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 133 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:21:08,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2023-11-23 21:21:08,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2023-11-23 21:21:08,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 46 states have (on average 2.130434782608696) internal successors, (98), 89 states have internal predecessors, (98), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:21:08,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 102 transitions. [2023-11-23 21:21:08,676 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 102 transitions. Word has length 6 [2023-11-23 21:21:08,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:21:08,677 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 102 transitions. [2023-11-23 21:21:08,677 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:08,677 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 102 transitions. [2023-11-23 21:21:08,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-23 21:21:08,678 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:08,678 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-23 21:21:08,678 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:21:08,679 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting node_createErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 44 more)] === [2023-11-23 21:21:08,679 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:08,679 INFO L85 PathProgramCache]: Analyzing trace with hash -1788653074, now seen corresponding path program 1 times [2023-11-23 21:21:08,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:08,680 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876633870] [2023-11-23 21:21:08,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:08,680 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:08,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:08,799 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:21:08,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:08,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876633870] [2023-11-23 21:21:08,800 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [876633870] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:21:08,800 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:21:08,801 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:21:08,801 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403307728] [2023-11-23 21:21:08,801 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:21:08,801 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:21:08,803 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:08,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:21:08,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:21:08,805 INFO L87 Difference]: Start difference. First operand 93 states and 102 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:08,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:08,900 INFO L93 Difference]: Finished difference Result 90 states and 99 transitions. [2023-11-23 21:21:08,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:21:08,900 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-23 21:21:08,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:08,902 INFO L225 Difference]: With dead ends: 90 [2023-11-23 21:21:08,902 INFO L226 Difference]: Without dead ends: 90 [2023-11-23 21:21:08,903 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:21:08,904 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 3 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:08,905 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 136 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:21:08,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2023-11-23 21:21:08,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2023-11-23 21:21:08,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 46 states have (on average 2.0652173913043477) internal successors, (95), 86 states have internal predecessors, (95), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:21:08,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 99 transitions. [2023-11-23 21:21:08,914 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 99 transitions. Word has length 6 [2023-11-23 21:21:08,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:21:08,915 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 99 transitions. [2023-11-23 21:21:08,915 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:08,915 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 99 transitions. [2023-11-23 21:21:08,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-23 21:21:08,916 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:08,916 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:21:08,916 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 21:21:08,917 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 44 more)] === [2023-11-23 21:21:08,917 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:08,917 INFO L85 PathProgramCache]: Analyzing trace with hash 644676676, now seen corresponding path program 1 times [2023-11-23 21:21:08,918 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:08,918 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240373217] [2023-11-23 21:21:08,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:08,918 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:08,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:09,212 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:21:09,212 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:09,213 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240373217] [2023-11-23 21:21:09,213 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240373217] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:21:09,213 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:21:09,213 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 21:21:09,214 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375752261] [2023-11-23 21:21:09,214 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:21:09,214 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:21:09,215 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:09,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:21:09,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:21:09,216 INFO L87 Difference]: Start difference. First operand 90 states and 99 transitions. Second operand has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:21:09,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:09,416 INFO L93 Difference]: Finished difference Result 88 states and 97 transitions. [2023-11-23 21:21:09,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:21:09,416 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2023-11-23 21:21:09,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:09,418 INFO L225 Difference]: With dead ends: 88 [2023-11-23 21:21:09,418 INFO L226 Difference]: Without dead ends: 88 [2023-11-23 21:21:09,418 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:21:09,420 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 10 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:09,420 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 263 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:21:09,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2023-11-23 21:21:09,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2023-11-23 21:21:09,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 46 states have (on average 2.0217391304347827) internal successors, (93), 84 states have internal predecessors, (93), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:21:09,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 97 transitions. [2023-11-23 21:21:09,428 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 97 transitions. Word has length 11 [2023-11-23 21:21:09,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:21:09,428 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 97 transitions. [2023-11-23 21:21:09,429 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:21:09,429 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 97 transitions. [2023-11-23 21:21:09,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-23 21:21:09,429 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:09,430 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:21:09,430 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 21:21:09,430 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 44 more)] === [2023-11-23 21:21:09,431 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:09,431 INFO L85 PathProgramCache]: Analyzing trace with hash 644676675, now seen corresponding path program 1 times [2023-11-23 21:21:09,431 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:09,431 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [475625998] [2023-11-23 21:21:09,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:09,432 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:09,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:09,533 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:21:09,534 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:09,534 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [475625998] [2023-11-23 21:21:09,534 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [475625998] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:21:09,534 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:21:09,534 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 21:21:09,535 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424646030] [2023-11-23 21:21:09,535 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:21:09,535 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:21:09,535 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:09,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:21:09,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:21:09,536 INFO L87 Difference]: Start difference. First operand 88 states and 97 transitions. Second operand has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:21:09,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:09,742 INFO L93 Difference]: Finished difference Result 86 states and 95 transitions. [2023-11-23 21:21:09,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:21:09,743 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2023-11-23 21:21:09,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:09,745 INFO L225 Difference]: With dead ends: 86 [2023-11-23 21:21:09,746 INFO L226 Difference]: Without dead ends: 86 [2023-11-23 21:21:09,746 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:21:09,750 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 9 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:09,753 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 251 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:21:09,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2023-11-23 21:21:09,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2023-11-23 21:21:09,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 46 states have (on average 1.9782608695652173) internal successors, (91), 82 states have internal predecessors, (91), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:21:09,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 95 transitions. [2023-11-23 21:21:09,774 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 95 transitions. Word has length 11 [2023-11-23 21:21:09,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:21:09,775 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 95 transitions. [2023-11-23 21:21:09,775 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:21:09,776 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 95 transitions. [2023-11-23 21:21:09,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-23 21:21:09,777 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:09,777 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:21:09,778 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-23 21:21:09,778 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 44 more)] === [2023-11-23 21:21:09,780 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:09,781 INFO L85 PathProgramCache]: Analyzing trace with hash -1530935535, now seen corresponding path program 1 times [2023-11-23 21:21:09,781 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:09,783 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142329538] [2023-11-23 21:21:09,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:09,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:09,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:09,860 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:21:09,860 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:09,861 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1142329538] [2023-11-23 21:21:09,861 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1142329538] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:21:09,861 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:21:09,861 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:21:09,862 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953961018] [2023-11-23 21:21:09,862 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:21:09,862 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:21:09,863 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:09,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:21:09,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:21:09,864 INFO L87 Difference]: Start difference. First operand 86 states and 95 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:21:09,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:09,916 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2023-11-23 21:21:09,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:21:09,917 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2023-11-23 21:21:09,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:09,918 INFO L225 Difference]: With dead ends: 92 [2023-11-23 21:21:09,919 INFO L226 Difference]: Without dead ends: 92 [2023-11-23 21:21:09,919 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:21:09,920 INFO L413 NwaCegarLoop]: 81 mSDtfsCounter, 1 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:09,921 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 157 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:21:09,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-11-23 21:21:09,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2023-11-23 21:21:09,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 50 states have (on average 1.9) internal successors, (95), 86 states have internal predecessors, (95), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:21:09,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 101 transitions. [2023-11-23 21:21:09,928 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 101 transitions. Word has length 14 [2023-11-23 21:21:09,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:21:09,928 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 101 transitions. [2023-11-23 21:21:09,928 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:21:09,929 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 101 transitions. [2023-11-23 21:21:09,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-23 21:21:09,930 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:09,930 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:21:09,930 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-23 21:21:09,931 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 44 more)] === [2023-11-23 21:21:09,931 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:09,931 INFO L85 PathProgramCache]: Analyzing trace with hash -196982527, now seen corresponding path program 1 times [2023-11-23 21:21:09,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:09,932 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674190980] [2023-11-23 21:21:09,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:09,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:09,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:10,096 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:21:10,096 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:10,097 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674190980] [2023-11-23 21:21:10,097 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674190980] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:21:10,097 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1109658143] [2023-11-23 21:21:10,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:10,098 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:10,098 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:21:10,100 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:21:10,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:21:10,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:10,304 INFO L262 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 21:21:10,311 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:21:10,412 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:21:10,412 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:21:10,463 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:21:10,463 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1109658143] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:21:10,464 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [756934590] [2023-11-23 21:21:10,487 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-23 21:21:10,488 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:21:10,494 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:21:10,501 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:21:10,502 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:21:13,949 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 38 for LOIs [2023-11-23 21:21:14,091 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:21:27,646 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1375#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~uneq~0#1| 5) (= |ULTIMATE.start_dll_append_#in~data#1| 5) (= |ULTIMATE.start_dll_append_~new_last~0#1.offset| 0) (= |ULTIMATE.start_dll_append_~head#1.offset| 0) (not (= (select |#valid| |ULTIMATE.start_dll_append_~head#1.base|) 1)) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (or (and (exists ((|v_#memory_$Pointer$.offset_BEFORE_CALL_16| (Array Int (Array Int Int)))) (= (select (select |v_#memory_$Pointer$.offset_BEFORE_CALL_16| |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (exists ((|v_#memory_int_51| (Array Int (Array Int Int))) (|v_#memory_int_52| (Array Int (Array Int Int))) (|v_#memory_int_50| (Array Int (Array Int Int)))) (and (= |v_#memory_int_52| (store |v_#memory_int_51| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (select |v_#memory_int_51| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 8 (select (select |v_#memory_int_52| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 8)))) (= |v_#memory_int_51| (store |v_#memory_int_50| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (select |v_#memory_int_50| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 4 (select (select |v_#memory_int_51| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 4)))) (= |#memory_int| (store |v_#memory_int_52| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (select |v_#memory_int_52| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 0 5))))) (= |ULTIMATE.start_dll_append_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (<= (+ |ULTIMATE.start_dll_append_~new_last~0#1.base| 1) |#StackHeapBarrier|) (not (= |ULTIMATE.start_dll_append_~new_last~0#1.base| 0)) (exists ((|v_#memory_$Pointer$.base_72| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_72| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (store (store (select |v_#memory_$Pointer$.base_72| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 4 0) 8 0) 0 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 0))) |#memory_$Pointer$.base|)) (exists ((|v_#memory_$Pointer$.offset_72| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_72| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (store (store (select |v_#memory_$Pointer$.offset_72| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 4 0) 8 0) 0 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 0))))) (exists ((|v_#valid_96| (Array Int Int))) (and (= 0 (select |v_#valid_96| |ULTIMATE.start_dll_append_~new_last~0#1.base|)) (= (store |v_#valid_96| |ULTIMATE.start_dll_append_~new_last~0#1.base| 1) |#valid|))) (exists ((|v_old(#memory_$Pointer$.base)_AFTER_CALL_10| (Array Int (Array Int Int)))) (= |ULTIMATE.start_dll_create_#res#1.base| (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_10| |ULTIMATE.start_main_~#s~0#1.base|) 0))) (exists ((|v_#length_81| (Array Int Int))) (= (store |v_#length_81| |ULTIMATE.start_dll_append_~new_last~0#1.base| 12) |#length|)) (= |ULTIMATE.start_dll_append_~head#1.base| |ULTIMATE.start_dll_append_#in~head#1.base|)) (and (exists ((|v_old(#memory_$Pointer$.offset)_AFTER_CALL_9| (Array Int (Array Int Int)))) (= (select (select |v_old(#memory_$Pointer$.offset)_AFTER_CALL_9| |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (exists ((|v_#memory_int_51| (Array Int (Array Int Int))) (|v_#memory_int_52| (Array Int (Array Int Int))) (|v_#memory_int_50| (Array Int (Array Int Int)))) (and (= |v_#memory_int_52| (store |v_#memory_int_51| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (select |v_#memory_int_51| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 8 (select (select |v_#memory_int_52| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 8)))) (= |v_#memory_int_51| (store |v_#memory_int_50| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (select |v_#memory_int_50| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 4 (select (select |v_#memory_int_51| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 4)))) (= |#memory_int| (store |v_#memory_int_52| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (select |v_#memory_int_52| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 0 5))))) (exists ((|v_old(#memory_$Pointer$.base)_AFTER_CALL_9| (Array Int (Array Int Int)))) (= |ULTIMATE.start_dll_create_#res#1.base| (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_9| |ULTIMATE.start_main_~#s~0#1.base|) 0))) (= |ULTIMATE.start_dll_append_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (<= (+ |ULTIMATE.start_dll_append_~new_last~0#1.base| 1) |#StackHeapBarrier|) (not (= |ULTIMATE.start_dll_append_~new_last~0#1.base| 0)) (exists ((|v_#memory_$Pointer$.base_72| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_72| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (store (store (select |v_#memory_$Pointer$.base_72| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 4 0) 8 0) 0 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 0))) |#memory_$Pointer$.base|)) (exists ((|v_#memory_$Pointer$.offset_72| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_72| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (store (store (select |v_#memory_$Pointer$.offset_72| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 4 0) 8 0) 0 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 0))))) (exists ((|v_#valid_96| (Array Int Int))) (and (= 0 (select |v_#valid_96| |ULTIMATE.start_dll_append_~new_last~0#1.base|)) (= (store |v_#valid_96| |ULTIMATE.start_dll_append_~new_last~0#1.base| 1) |#valid|))) (exists ((|v_#length_81| (Array Int Int))) (= (store |v_#length_81| |ULTIMATE.start_dll_append_~new_last~0#1.base| 12) |#length|)) (= |ULTIMATE.start_dll_append_~head#1.base| |ULTIMATE.start_dll_append_#in~head#1.base|))) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_create_#res#1.offset| 0) (<= 2 |ULTIMATE.start_dll_append_~head#1.base|) (= |ULTIMATE.start_dll_append_#in~head#1.offset| 0) (= 5 |ULTIMATE.start_dll_append_~data#1|))' at error location [2023-11-23 21:21:27,647 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:21:27,647 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:21:27,647 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 4 [2023-11-23 21:21:27,648 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855875848] [2023-11-23 21:21:27,648 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:21:27,649 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:21:27,650 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:27,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:21:27,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=314, Unknown=4, NotChecked=0, Total=380 [2023-11-23 21:21:27,652 INFO L87 Difference]: Start difference. First operand 91 states and 101 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 21:21:27,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:27,748 INFO L93 Difference]: Finished difference Result 93 states and 103 transitions. [2023-11-23 21:21:27,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:21:27,750 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2023-11-23 21:21:27,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:27,751 INFO L225 Difference]: With dead ends: 93 [2023-11-23 21:21:27,751 INFO L226 Difference]: Without dead ends: 93 [2023-11-23 21:21:27,752 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=62, Invalid=314, Unknown=4, NotChecked=0, Total=380 [2023-11-23 21:21:27,753 INFO L413 NwaCegarLoop]: 81 mSDtfsCounter, 9 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:27,754 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 161 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:21:27,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2023-11-23 21:21:27,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2023-11-23 21:21:27,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 52 states have (on average 1.8653846153846154) internal successors, (97), 88 states have internal predecessors, (97), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:21:27,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 103 transitions. [2023-11-23 21:21:27,763 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 103 transitions. Word has length 24 [2023-11-23 21:21:27,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:21:27,764 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 103 transitions. [2023-11-23 21:21:27,764 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 21:21:27,765 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 103 transitions. [2023-11-23 21:21:27,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-23 21:21:27,766 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:27,766 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2023-11-23 21:21:27,805 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:21:27,992 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:27,993 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 44 more)] === [2023-11-23 21:21:27,993 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:27,993 INFO L85 PathProgramCache]: Analyzing trace with hash 1713381069, now seen corresponding path program 1 times [2023-11-23 21:21:27,993 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:27,994 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1966174761] [2023-11-23 21:21:27,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:27,994 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:28,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:28,784 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:21:28,785 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:28,785 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1966174761] [2023-11-23 21:21:28,785 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1966174761] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:21:28,785 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1858731019] [2023-11-23 21:21:28,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:28,786 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:28,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:21:28,788 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:21:28,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:21:29,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:29,050 INFO L262 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-23 21:21:29,054 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:21:29,130 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| 1))) is different from true [2023-11-23 21:21:29,251 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-23 21:21:29,253 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2023-11-23 21:21:29,325 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:21:29,326 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:21:29,719 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:21:29,719 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1858731019] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:21:29,719 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1020886434] [2023-11-23 21:21:29,722 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-23 21:21:29,722 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:21:29,723 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:21:29,723 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:21:29,723 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:21:31,825 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 122 for LOIs [2023-11-23 21:21:32,359 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:21:42,239 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1746#(and (= |ULTIMATE.start_dll_create_~new_head~0#1.offset| 0) (exists ((|v_#memory_int_87| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_87| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (store (select |v_#memory_int_87| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0 1) 4 (select (select |#memory_int| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 4))))) (<= 1 |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.offset_109| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_110| (Array Int (Array Int Int)))) (and (= |v_#memory_$Pointer$.offset_110| (store |v_#memory_$Pointer$.offset_109| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.offset_109| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0 (select (select |v_#memory_$Pointer$.offset_110| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_110| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.offset_110| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 4 0))))) (exists ((|v_#memory_$Pointer$.base_109| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_110| (Array Int (Array Int Int)))) (and (= (store |v_#memory_$Pointer$.base_110| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.base_110| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 4 |ULTIMATE.start_dll_create_~head~0#1.base|)) |#memory_$Pointer$.base|) (= (store |v_#memory_$Pointer$.base_109| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.base_109| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0 (select (select |v_#memory_$Pointer$.base_110| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0))) |v_#memory_$Pointer$.base_110|))) (not (= |ULTIMATE.start_dll_create_~head~0#1.base| 0)) (not (= (select |#valid| |ULTIMATE.start_dll_create_~head~0#1.base|) 1)) (= (select |#valid| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 1) (= |ULTIMATE.start_dll_create_#in~len#1| 2) (<= |ULTIMATE.start_dll_create_~len#1| 2) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_dll_create_#in~data#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_create_~head~0#1.offset| 0) (<= 8 (select |#length| |ULTIMATE.start_dll_create_~new_head~0#1.base|)) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_dll_create_~data#1| 1))' at error location [2023-11-23 21:21:42,239 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:21:42,240 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:21:42,240 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5, 4] total 12 [2023-11-23 21:21:42,240 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322219667] [2023-11-23 21:21:42,241 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:21:42,241 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-23 21:21:42,241 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:42,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-23 21:21:42,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=550, Unknown=1, NotChecked=48, Total=702 [2023-11-23 21:21:42,244 INFO L87 Difference]: Start difference. First operand 93 states and 103 transitions. Second operand has 13 states, 10 states have (on average 4.0) internal successors, (40), 11 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 21:21:43,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:43,502 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2023-11-23 21:21:43,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-23 21:21:43,503 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 4.0) internal successors, (40), 11 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 27 [2023-11-23 21:21:43,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:43,505 INFO L225 Difference]: With dead ends: 92 [2023-11-23 21:21:43,505 INFO L226 Difference]: Without dead ends: 92 [2023-11-23 21:21:43,506 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 63 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=120, Invalid=695, Unknown=1, NotChecked=54, Total=870 [2023-11-23 21:21:43,507 INFO L413 NwaCegarLoop]: 73 mSDtfsCounter, 8 mSDsluCounter, 343 mSDsCounter, 0 mSdLazyCounter, 447 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 416 SdHoareTripleChecker+Invalid, 550 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 447 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 96 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:43,508 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 416 Invalid, 550 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 447 Invalid, 0 Unknown, 96 Unchecked, 1.0s Time] [2023-11-23 21:21:43,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-11-23 21:21:43,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2023-11-23 21:21:43,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 52 states have (on average 1.8461538461538463) internal successors, (96), 87 states have internal predecessors, (96), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:21:43,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 102 transitions. [2023-11-23 21:21:43,516 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 102 transitions. Word has length 27 [2023-11-23 21:21:43,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:21:43,517 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 102 transitions. [2023-11-23 21:21:43,517 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 4.0) internal successors, (40), 11 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 21:21:43,517 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 102 transitions. [2023-11-23 21:21:43,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-23 21:21:43,518 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:43,519 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2023-11-23 21:21:43,544 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:21:43,731 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:43,732 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 44 more)] === [2023-11-23 21:21:43,732 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:43,733 INFO L85 PathProgramCache]: Analyzing trace with hash 1713381070, now seen corresponding path program 1 times [2023-11-23 21:21:43,733 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:43,733 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490819] [2023-11-23 21:21:43,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:43,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:43,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:44,711 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:21:44,712 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:44,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490819] [2023-11-23 21:21:44,712 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [490819] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:21:44,714 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [86786388] [2023-11-23 21:21:44,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:44,715 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:44,715 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:21:44,716 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:21:44,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab239401-9090-426c-bcbd-76323821ad6d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:21:44,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:44,866 INFO L262 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-23 21:21:44,870 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:21:44,878 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-23 21:21:45,291 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (= (store |c_old(#length)| |node_create_~temp~0#1.base| (select |c_#length| |node_create_~temp~0#1.base|)) |c_#length|) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-23 21:21:45,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:21:45,373 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-23 21:21:45,394 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-23 21:21:45,394 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-23 21:21:45,456 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 5 not checked. [2023-11-23 21:21:45,456 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:21:45,812 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [86786388] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:21:45,812 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [446950817] [2023-11-23 21:21:45,815 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-23 21:21:45,816 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:21:45,816 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:21:45,816 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:21:45,817 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:21:47,423 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 122 for LOIs [2023-11-23 21:21:47,857 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:21:57,180 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2067#(and (= |ULTIMATE.start_dll_create_~new_head~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (exists ((|v_#memory_int_107| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_107| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (store (select |v_#memory_int_107| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0 1) 4 (select (select |#memory_int| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 4))))) (not (= |ULTIMATE.start_dll_create_~head~0#1.base| 0)) (<= (select |#length| |ULTIMATE.start_dll_create_~head~0#1.base|) 11) (= (select |#valid| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 1) (exists ((|v_#memory_$Pointer$.base_130| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_129| (Array Int (Array Int Int)))) (and (= (store |v_#memory_$Pointer$.base_130| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.base_130| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 4 |ULTIMATE.start_dll_create_~head~0#1.base|)) |#memory_$Pointer$.base|) (= |v_#memory_$Pointer$.base_130| (store |v_#memory_$Pointer$.base_129| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.base_129| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0 (select (select |v_#memory_$Pointer$.base_130| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0)))))) (= |ULTIMATE.start_dll_create_#in~len#1| 2) (<= |ULTIMATE.start_dll_create_~len#1| 2) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_dll_create_#in~data#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_create_~head~0#1.offset| 0) (<= 8 (select |#length| |ULTIMATE.start_dll_create_~new_head~0#1.base|)) (exists ((|v_#memory_$Pointer$.offset_129| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_130| (Array Int (Array Int Int)))) (and (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_130| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.offset_130| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 4 0))) (= (store |v_#memory_$Pointer$.offset_129| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.offset_129| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0 (select (select |v_#memory_$Pointer$.offset_130| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0))) |v_#memory_$Pointer$.offset_130|))) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_dll_create_~data#1| 1))' at error location [2023-11-23 21:21:57,180 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:21:57,180 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:21:57,180 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 16 [2023-11-23 21:21:57,180 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065246392] [2023-11-23 21:21:57,180 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:21:57,181 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-23 21:21:57,181 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:57,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-23 21:21:57,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=882, Unknown=1, NotChecked=60, Total=1056 [2023-11-23 21:21:57,183 INFO L87 Difference]: Start difference. First operand 92 states and 102 transitions. Second operand has 17 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 14 states have internal predecessors, (35), 2 states have call successors, (2), 2 states have call predecessors, (2), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4)