./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 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/dll2n_append_unequal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ --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-9bd2c7f [2023-11-19 04:59:36,424 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 04:59:36,509 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-19 04:59:36,517 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 04:59:36,517 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 04:59:36,549 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 04:59:36,549 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 04:59:36,550 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 04:59:36,551 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 04:59:36,552 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 04:59:36,553 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 04:59:36,554 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 04:59:36,554 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 04:59:36,555 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 04:59:36,556 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 04:59:36,556 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 04:59:36,557 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 04:59:36,558 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 04:59:36,559 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 04:59:36,559 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 04:59:36,560 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 04:59:36,561 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 04:59:36,562 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-19 04:59:36,563 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-19 04:59:36,564 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 04:59:36,564 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 04:59:36,565 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 04:59:36,566 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 04:59:36,566 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 04:59:36,567 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-19 04:59:36,568 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-19 04:59:36,568 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-19 04:59:36,569 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 04:59:36,570 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-19 04:59:36,570 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-19 04:59:36,571 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 04:59:36,571 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 04:59:36,572 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 04:59:36,572 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 04:59:36,573 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:59:36,573 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 04:59:36,574 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 04:59:36,575 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 04:59:36,575 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 04:59:36,576 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 04:59:36,576 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 04:59:36,577 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_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8e4e2611155a39995b0fc64ec45d64e4c98f789d2737326ee819380629347be0 [2023-11-19 04:59:36,900 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 04:59:36,954 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 04:59:36,957 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 04:59:36,960 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 04:59:36,962 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 04:59:36,963 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/list-simple/dll2n_append_unequal.i [2023-11-19 04:59:40,879 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 04:59:41,379 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 04:59:41,380 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/sv-benchmarks/c/list-simple/dll2n_append_unequal.i [2023-11-19 04:59:41,406 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/data/68e4febce/8c7f2a78c17f4637809d913310417e3f/FLAG46936925a [2023-11-19 04:59:41,422 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/data/68e4febce/8c7f2a78c17f4637809d913310417e3f [2023-11-19 04:59:41,425 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 04:59:41,427 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 04:59:41,429 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 04:59:41,429 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 04:59:41,437 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 04:59:41,438 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:59:41" (1/1) ... [2023-11-19 04:59:41,439 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@32518bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:41, skipping insertion in model container [2023-11-19 04:59:41,440 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:59:41" (1/1) ... [2023-11-19 04:59:41,503 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 04:59:41,932 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:59:41,945 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 04:59:41,997 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:59:42,041 INFO L206 MainTranslator]: Completed translation [2023-11-19 04:59:42,042 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:42 WrapperNode [2023-11-19 04:59:42,042 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 04:59:42,044 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 04:59:42,044 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 04:59:42,044 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 04:59:42,054 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:42" (1/1) ... [2023-11-19 04:59:42,102 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:42" (1/1) ... [2023-11-19 04:59:42,141 INFO L138 Inliner]: procedures = 127, calls = 41, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 146 [2023-11-19 04:59:42,141 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 04:59:42,142 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 04:59:42,142 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 04:59:42,143 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 04:59:42,155 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:42" (1/1) ... [2023-11-19 04:59:42,155 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:42" (1/1) ... [2023-11-19 04:59:42,160 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:42" (1/1) ... [2023-11-19 04:59:42,160 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:42" (1/1) ... [2023-11-19 04:59:42,171 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:42" (1/1) ... [2023-11-19 04:59:42,187 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:42" (1/1) ... [2023-11-19 04:59:42,190 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:42" (1/1) ... [2023-11-19 04:59:42,193 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:42" (1/1) ... [2023-11-19 04:59:42,198 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 04:59:42,199 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 04:59:42,199 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 04:59:42,199 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 04:59:42,200 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:42" (1/1) ... [2023-11-19 04:59:42,221 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:59:42,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:59:42,249 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 04:59:42,265 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 04:59:42,302 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 04:59:42,303 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 04:59:42,303 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-19 04:59:42,303 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-19 04:59:42,303 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-19 04:59:42,303 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 04:59:42,304 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 04:59:42,304 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-19 04:59:42,304 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-19 04:59:42,304 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 04:59:42,304 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-19 04:59:42,305 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 04:59:42,305 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 04:59:42,305 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 04:59:42,463 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 04:59:42,466 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 04:59:42,986 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 04:59:43,062 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 04:59:43,063 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-19 04:59:43,070 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:59:43 BoogieIcfgContainer [2023-11-19 04:59:43,070 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 04:59:43,075 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 04:59:43,075 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 04:59:43,080 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 04:59:43,080 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 04:59:41" (1/3) ... [2023-11-19 04:59:43,081 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72267d83 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:59:43, skipping insertion in model container [2023-11-19 04:59:43,082 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:42" (2/3) ... [2023-11-19 04:59:43,082 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72267d83 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:59:43, skipping insertion in model container [2023-11-19 04:59:43,083 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:59:43" (3/3) ... [2023-11-19 04:59:43,085 INFO L112 eAbstractionObserver]: Analyzing ICFG dll2n_append_unequal.i [2023-11-19 04:59:43,113 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 04:59:43,113 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 47 error locations. [2023-11-19 04:59:43,187 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 04:59:43,194 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;@597a6187, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 04:59:43,195 INFO L358 AbstractCegarLoop]: Starting to check reachability of 47 error locations. [2023-11-19 04:59:43,199 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) [2023-11-19 04:59:43,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-19 04:59:43,210 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:59:43,211 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-19 04:59:43,212 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)] === [2023-11-19 04:59:43,224 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:59:43,224 INFO L85 PathProgramCache]: Analyzing trace with hash -1487525647, now seen corresponding path program 1 times [2023-11-19 04:59:43,237 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:59:43,238 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2010612982] [2023-11-19 04:59:43,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:59:43,239 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:59:43,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:43,613 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:59:43,614 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:59:43,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2010612982] [2023-11-19 04:59:43,618 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2010612982] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:59:43,618 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:59:43,618 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 04:59:43,620 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922807503] [2023-11-19 04:59:43,621 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:59:43,627 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 04:59:43,628 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:59:43,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 04:59:43,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:59:43,677 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) [2023-11-19 04:59:43,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:59:43,796 INFO L93 Difference]: Finished difference Result 111 states and 123 transitions. [2023-11-19 04:59:43,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 04:59:43,802 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 [2023-11-19 04:59:43,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:59:43,816 INFO L225 Difference]: With dead ends: 111 [2023-11-19 04:59:43,816 INFO L226 Difference]: Without dead ends: 109 [2023-11-19 04:59:43,819 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 [2023-11-19 04:59:43,830 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 13 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:59:43,831 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 186 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:59:43,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2023-11-19 04:59:43,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 96. [2023-11-19 04:59:43,956 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) [2023-11-19 04:59:43,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 105 transitions. [2023-11-19 04:59:43,961 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 105 transitions. Word has length 6 [2023-11-19 04:59:43,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:59:43,962 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 105 transitions. [2023-11-19 04:59:43,962 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) [2023-11-19 04:59:43,963 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 105 transitions. [2023-11-19 04:59:43,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-19 04:59:43,963 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:59:43,963 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-19 04:59:43,964 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 04:59:43,964 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)] === [2023-11-19 04:59:43,966 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:59:43,966 INFO L85 PathProgramCache]: Analyzing trace with hash -1674136471, now seen corresponding path program 1 times [2023-11-19 04:59:43,966 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:59:43,967 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629051793] [2023-11-19 04:59:43,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:59:43,967 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:59:43,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:44,072 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:59:44,073 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:59:44,073 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629051793] [2023-11-19 04:59:44,073 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629051793] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:59:44,073 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:59:44,074 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 04:59:44,074 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379274458] [2023-11-19 04:59:44,074 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:59:44,075 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 04:59:44,076 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:59:44,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 04:59:44,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:59:44,077 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) [2023-11-19 04:59:44,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:59:44,210 INFO L93 Difference]: Finished difference Result 93 states and 102 transitions. [2023-11-19 04:59:44,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 04:59:44,211 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 [2023-11-19 04:59:44,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:59:44,213 INFO L225 Difference]: With dead ends: 93 [2023-11-19 04:59:44,213 INFO L226 Difference]: Without dead ends: 93 [2023-11-19 04:59:44,214 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 [2023-11-19 04:59:44,216 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 [2023-11-19 04:59:44,217 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] [2023-11-19 04:59:44,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2023-11-19 04:59:44,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2023-11-19 04:59:44,232 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) [2023-11-19 04:59:44,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 102 transitions. [2023-11-19 04:59:44,246 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 102 transitions. Word has length 6 [2023-11-19 04:59:44,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:59:44,247 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 102 transitions. [2023-11-19 04:59:44,247 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) [2023-11-19 04:59:44,248 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 102 transitions. [2023-11-19 04:59:44,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-19 04:59:44,248 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:59:44,249 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-19 04:59:44,249 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 04:59:44,249 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)] === [2023-11-19 04:59:44,257 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:59:44,263 INFO L85 PathProgramCache]: Analyzing trace with hash -1674136470, now seen corresponding path program 1 times [2023-11-19 04:59:44,264 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:59:44,264 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1672061863] [2023-11-19 04:59:44,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:59:44,265 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:59:44,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:44,493 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:59:44,493 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:59:44,494 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1672061863] [2023-11-19 04:59:44,494 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1672061863] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:59:44,494 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:59:44,494 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 04:59:44,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198436233] [2023-11-19 04:59:44,495 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:59:44,495 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 04:59:44,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:59:44,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 04:59:44,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:59:44,497 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) [2023-11-19 04:59:44,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:59:44,627 INFO L93 Difference]: Finished difference Result 90 states and 99 transitions. [2023-11-19 04:59:44,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 04:59:44,630 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 [2023-11-19 04:59:44,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:59:44,631 INFO L225 Difference]: With dead ends: 90 [2023-11-19 04:59:44,632 INFO L226 Difference]: Without dead ends: 90 [2023-11-19 04:59:44,632 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 [2023-11-19 04:59:44,634 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 [2023-11-19 04:59:44,635 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] [2023-11-19 04:59:44,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2023-11-19 04:59:44,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2023-11-19 04:59:44,656 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) [2023-11-19 04:59:44,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 99 transitions. [2023-11-19 04:59:44,661 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 99 transitions. Word has length 6 [2023-11-19 04:59:44,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:59:44,662 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 99 transitions. [2023-11-19 04:59:44,662 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) [2023-11-19 04:59:44,663 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 99 transitions. [2023-11-19 04:59:44,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-19 04:59:44,664 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:59:44,664 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:59:44,665 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-19 04:59:44,665 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)] === [2023-11-19 04:59:44,670 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:59:44,671 INFO L85 PathProgramCache]: Analyzing trace with hash 2046686668, now seen corresponding path program 1 times [2023-11-19 04:59:44,671 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:59:44,672 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [523425604] [2023-11-19 04:59:44,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:59:44,673 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:59:44,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:44,990 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:59:44,990 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:59:44,991 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [523425604] [2023-11-19 04:59:44,991 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [523425604] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:59:44,991 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:59:44,992 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 04:59:44,992 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278898844] [2023-11-19 04:59:44,992 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:59:44,993 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 04:59:44,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:59:44,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 04:59:44,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-19 04:59:44,997 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) [2023-11-19 04:59:45,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:59:45,278 INFO L93 Difference]: Finished difference Result 88 states and 97 transitions. [2023-11-19 04:59:45,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 04:59:45,279 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 [2023-11-19 04:59:45,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:59:45,280 INFO L225 Difference]: With dead ends: 88 [2023-11-19 04:59:45,281 INFO L226 Difference]: Without dead ends: 88 [2023-11-19 04:59:45,281 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-19 04:59:45,283 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 10 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s 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 [2023-11-19 04:59:45,289 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] [2023-11-19 04:59:45,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2023-11-19 04:59:45,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2023-11-19 04:59:45,310 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) [2023-11-19 04:59:45,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 97 transitions. [2023-11-19 04:59:45,312 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 97 transitions. Word has length 11 [2023-11-19 04:59:45,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:59:45,312 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 97 transitions. [2023-11-19 04:59:45,313 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) [2023-11-19 04:59:45,313 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 97 transitions. [2023-11-19 04:59:45,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-19 04:59:45,314 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:59:45,314 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:59:45,314 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-19 04:59:45,316 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)] === [2023-11-19 04:59:45,317 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:59:45,317 INFO L85 PathProgramCache]: Analyzing trace with hash 2046686667, now seen corresponding path program 1 times [2023-11-19 04:59:45,318 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:59:45,318 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1211782084] [2023-11-19 04:59:45,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:59:45,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:59:45,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:45,497 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:59:45,497 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:59:45,498 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1211782084] [2023-11-19 04:59:45,498 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1211782084] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:59:45,499 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:59:45,499 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 04:59:45,499 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667813723] [2023-11-19 04:59:45,500 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:59:45,502 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 04:59:45,502 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:59:45,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 04:59:45,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-19 04:59:45,503 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) [2023-11-19 04:59:45,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:59:45,769 INFO L93 Difference]: Finished difference Result 86 states and 95 transitions. [2023-11-19 04:59:45,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 04:59:45,770 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 [2023-11-19 04:59:45,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:59:45,773 INFO L225 Difference]: With dead ends: 86 [2023-11-19 04:59:45,773 INFO L226 Difference]: Without dead ends: 86 [2023-11-19 04:59:45,773 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 [2023-11-19 04:59:45,782 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 [2023-11-19 04:59:45,783 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] [2023-11-19 04:59:45,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2023-11-19 04:59:45,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2023-11-19 04:59:45,798 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) [2023-11-19 04:59:45,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 95 transitions. [2023-11-19 04:59:45,799 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 95 transitions. Word has length 11 [2023-11-19 04:59:45,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:59:45,800 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 95 transitions. [2023-11-19 04:59:45,800 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) [2023-11-19 04:59:45,801 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 95 transitions. [2023-11-19 04:59:45,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-19 04:59:45,801 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:59:45,802 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:59:45,802 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-19 04:59:45,802 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)] === [2023-11-19 04:59:45,803 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:59:45,803 INFO L85 PathProgramCache]: Analyzing trace with hash 1486749833, now seen corresponding path program 1 times [2023-11-19 04:59:45,803 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:59:45,804 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1334878089] [2023-11-19 04:59:45,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:59:45,804 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:59:45,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:45,886 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:59:45,886 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:59:45,887 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1334878089] [2023-11-19 04:59:45,887 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1334878089] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:59:45,887 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:59:45,887 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 04:59:45,888 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1580146124] [2023-11-19 04:59:45,889 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:59:45,891 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 04:59:45,895 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:59:45,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 04:59:45,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:59:45,896 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) [2023-11-19 04:59:45,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:59:45,950 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2023-11-19 04:59:45,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 04:59:45,952 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 [2023-11-19 04:59:45,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:59:45,961 INFO L225 Difference]: With dead ends: 92 [2023-11-19 04:59:45,962 INFO L226 Difference]: Without dead ends: 92 [2023-11-19 04:59:45,962 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 [2023-11-19 04:59:45,967 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 [2023-11-19 04:59:45,970 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] [2023-11-19 04:59:45,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-11-19 04:59:45,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2023-11-19 04:59:45,986 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) [2023-11-19 04:59:45,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 101 transitions. [2023-11-19 04:59:45,988 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 101 transitions. Word has length 14 [2023-11-19 04:59:45,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:59:45,988 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 101 transitions. [2023-11-19 04:59:45,989 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) [2023-11-19 04:59:45,989 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 101 transitions. [2023-11-19 04:59:45,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-19 04:59:45,990 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:59:45,991 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:59:45,991 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-19 04:59:45,992 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)] === [2023-11-19 04:59:45,992 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:59:45,993 INFO L85 PathProgramCache]: Analyzing trace with hash -1583400195, now seen corresponding path program 1 times [2023-11-19 04:59:45,993 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:59:45,993 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496398887] [2023-11-19 04:59:45,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:59:45,994 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:59:46,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:46,175 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:59:46,175 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:59:46,176 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496398887] [2023-11-19 04:59:46,176 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496398887] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:59:46,176 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1820378668] [2023-11-19 04:59:46,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:59:46,177 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:59:46,177 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:59:46,180 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:59:46,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 04:59:46,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:46,394 INFO L262 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 04:59:46,405 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:59:46,484 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:59:46,484 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:59:46,544 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:59:46,545 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1820378668] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:59:46,545 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1643272507] [2023-11-19 04:59:46,574 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-19 04:59:46,574 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:59:46,580 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:59:46,588 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:59:46,589 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:59:50,502 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 38 for LOIs [2023-11-19 04:59:50,641 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:00:04,011 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1376#(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 [2023-11-19 05:00:04,011 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:00:04,012 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:00:04,012 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 5 [2023-11-19 05:00:04,012 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633938876] [2023-11-19 05:00:04,013 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:00:04,014 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:00:04,014 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:04,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:00:04,015 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=350, Unknown=4, NotChecked=0, Total=420 [2023-11-19 05:00:04,016 INFO L87 Difference]: Start difference. First operand 91 states and 101 transitions. Second operand has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-19 05:00:04,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:04,110 INFO L93 Difference]: Finished difference Result 93 states and 103 transitions. [2023-11-19 05:00:04,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:00:04,110 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 24 [2023-11-19 05:00:04,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:04,112 INFO L225 Difference]: With dead ends: 93 [2023-11-19 05:00:04,112 INFO L226 Difference]: Without dead ends: 93 [2023-11-19 05:00:04,113 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 53 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=66, Invalid=350, Unknown=4, NotChecked=0, Total=420 [2023-11-19 05:00:04,114 INFO L413 NwaCegarLoop]: 81 mSDtfsCounter, 9 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:00:04,114 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 169 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:00:04,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2023-11-19 05:00:04,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2023-11-19 05:00:04,120 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) [2023-11-19 05:00:04,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 103 transitions. [2023-11-19 05:00:04,122 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 103 transitions. Word has length 24 [2023-11-19 05:00:04,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:04,122 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 103 transitions. [2023-11-19 05:00:04,123 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-19 05:00:04,123 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 103 transitions. [2023-11-19 05:00:04,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-19 05:00:04,124 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:04,124 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2023-11-19 05:00:04,156 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:00:04,330 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:00:04,331 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)] === [2023-11-19 05:00:04,332 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:04,332 INFO L85 PathProgramCache]: Analyzing trace with hash -649847983, now seen corresponding path program 1 times [2023-11-19 05:00:04,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:04,332 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [14202486] [2023-11-19 05:00:04,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:04,333 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:04,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:04,958 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:04,958 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:00:04,958 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [14202486] [2023-11-19 05:00:04,958 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [14202486] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:00:04,958 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1473520419] [2023-11-19 05:00:04,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:04,958 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:00:04,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:00:04,960 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:00:04,965 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:00:05,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:05,087 INFO L262 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-19 05:00:05,093 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:00:05,297 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-11-19 05:00:05,298 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-11-19 05:00:05,361 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:05,361 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:00:05,483 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1473520419] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:00:05,483 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [882721870] [2023-11-19 05:00:05,486 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-19 05:00:05,486 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:00:05,486 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:00:05,487 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:00:05,487 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:00:07,250 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 122 for LOIs [2023-11-19 05:00:07,630 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:00:16,388 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1689#(and (= |ULTIMATE.start_dll_create_~new_head~0#1.offset| 0) (exists ((|v_#memory_int_77| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_77| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (store (select |v_#memory_int_77| |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|) (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) (exists ((|v_#memory_$Pointer$.offset_99| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_100| (Array Int (Array Int Int)))) (and (= (store |v_#memory_$Pointer$.offset_99| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.offset_99| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0 (select (select |v_#memory_$Pointer$.offset_100| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0))) |v_#memory_$Pointer$.offset_100|) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_100| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.offset_100| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 4 0))))) (= |ULTIMATE.start_dll_create_#in~len#1| 2) (<= |ULTIMATE.start_dll_create_~len#1| 2) (= |ULTIMATE.start_main_~data~0#1| 1) (exists ((|v_#memory_$Pointer$.base_99| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_100| (Array Int (Array Int Int)))) (and (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_100| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.base_100| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 4 |ULTIMATE.start_dll_create_~head~0#1.base|))) (= (store |v_#memory_$Pointer$.base_99| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.base_99| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0 (select (select |v_#memory_$Pointer$.base_100| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0))) |v_#memory_$Pointer$.base_100|))) (= |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 [2023-11-19 05:00:16,388 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:00:16,388 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:00:16,389 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 13 [2023-11-19 05:00:16,389 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659813671] [2023-11-19 05:00:16,389 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:00:16,389 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-19 05:00:16,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:16,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-19 05:00:16,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=704, Unknown=0, NotChecked=0, Total=812 [2023-11-19 05:00:16,392 INFO L87 Difference]: Start difference. First operand 93 states and 103 transitions. Second operand has 14 states, 10 states have (on average 3.6) internal successors, (36), 11 states have internal predecessors, (36), 2 states have call successors, (2), 2 states have call predecessors, (2), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-19 05:00:17,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:17,700 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2023-11-19 05:00:17,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:00:17,701 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 10 states have (on average 3.6) internal successors, (36), 11 states have internal predecessors, (36), 2 states have call successors, (2), 2 states have call predecessors, (2), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 27 [2023-11-19 05:00:17,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:17,702 INFO L225 Difference]: With dead ends: 92 [2023-11-19 05:00:17,702 INFO L226 Difference]: Without dead ends: 92 [2023-11-19 05:00:17,704 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=141, Invalid=915, Unknown=0, NotChecked=0, Total=1056 [2023-11-19 05:00:17,704 INFO L413 NwaCegarLoop]: 73 mSDtfsCounter, 12 mSDsluCounter, 386 mSDsCounter, 0 mSdLazyCounter, 511 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 511 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:00:17,705 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 459 Invalid, 517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 511 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-19 05:00:17,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-11-19 05:00:17,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2023-11-19 05:00:17,710 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) [2023-11-19 05:00:17,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 102 transitions. [2023-11-19 05:00:17,711 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 102 transitions. Word has length 27 [2023-11-19 05:00:17,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:17,712 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 102 transitions. [2023-11-19 05:00:17,712 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 10 states have (on average 3.6) internal successors, (36), 11 states have internal predecessors, (36), 2 states have call successors, (2), 2 states have call predecessors, (2), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-19 05:00:17,712 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 102 transitions. [2023-11-19 05:00:17,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-19 05:00:17,714 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:17,714 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2023-11-19 05:00:17,739 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-19 05:00:17,937 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:00:17,937 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)] === [2023-11-19 05:00:17,938 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:17,938 INFO L85 PathProgramCache]: Analyzing trace with hash -649847982, now seen corresponding path program 1 times [2023-11-19 05:00:17,938 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:17,938 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [983504026] [2023-11-19 05:00:17,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:17,939 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:17,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:18,903 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:18,903 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:00:18,903 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [983504026] [2023-11-19 05:00:18,904 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [983504026] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:00:18,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [976227713] [2023-11-19 05:00:18,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:18,904 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:00:18,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:00:18,905 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:00:18,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:00:19,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:19,047 INFO L262 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 33 conjunts are in the unsatisfiable core [2023-11-19 05:00:19,051 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:00:19,069 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 [2023-11-19 05:00:19,549 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-19 05:00:19,550 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 [2023-11-19 05:00:19,560 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 [2023-11-19 05:00:19,668 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:19,668 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:00:20,023 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [976227713] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:00:20,024 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1749268922] [2023-11-19 05:00:20,027 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-19 05:00:20,027 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:00:20,027 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:00:20,028 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:00:20,028 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:00:21,477 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 122 for LOIs [2023-11-19 05:00:21,884 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:00:31,133 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2012#(and (= |ULTIMATE.start_dll_create_~new_head~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (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) (= |ULTIMATE.start_dll_create_#in~len#1| 2) (= |ULTIMATE.start_main_~data~0#1| 1) (exists ((|v_#memory_$Pointer$.offset_119| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_120| (Array Int (Array Int Int)))) (and (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_120| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.offset_120| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 4 0))) (= (store |v_#memory_$Pointer$.offset_119| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.offset_119| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0 (select (select |v_#memory_$Pointer$.offset_120| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0))) |v_#memory_$Pointer$.offset_120|))) (= |ULTIMATE.start_dll_create_#in~data#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (exists ((|v_#memory_int_97| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_97| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (store (select |v_#memory_int_97| |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))))) (= |ULTIMATE.start_dll_create_~len#1| 1) (= |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|) (exists ((|v_#memory_$Pointer$.base_119| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_120| (Array Int (Array Int Int)))) (and (= (store |v_#memory_$Pointer$.base_120| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.base_120| |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_119| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.base_119| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0 (select (select |v_#memory_$Pointer$.base_120| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0))) |v_#memory_$Pointer$.base_120|))) (= |ULTIMATE.start_dll_create_~data#1| 1))' at error location [2023-11-19 05:00:31,134 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:00:31,134 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:00:31,134 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 17 [2023-11-19 05:00:31,134 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839726373] [2023-11-19 05:00:31,134 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:00:31,135 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-19 05:00:31,135 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:31,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-19 05:00:31,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=996, Unknown=0, NotChecked=0, Total=1122 [2023-11-19 05:00:31,137 INFO L87 Difference]: Start difference. First operand 92 states and 102 transitions. Second operand has 18 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (2), 2 states have call predecessors, (2), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-19 05:00:32,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:32,789 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2023-11-19 05:00:32,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-19 05:00:32,790 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (2), 2 states have call predecessors, (2), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 27 [2023-11-19 05:00:32,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:32,791 INFO L225 Difference]: With dead ends: 92 [2023-11-19 05:00:32,791 INFO L226 Difference]: Without dead ends: 92 [2023-11-19 05:00:32,792 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 335 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=171, Invalid=1311, Unknown=0, NotChecked=0, Total=1482 [2023-11-19 05:00:32,793 INFO L413 NwaCegarLoop]: 73 mSDtfsCounter, 7 mSDsluCounter, 409 mSDsCounter, 0 mSdLazyCounter, 596 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 482 SdHoareTripleChecker+Invalid, 602 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 596 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:00:32,794 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 482 Invalid, 602 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 596 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2023-11-19 05:00:32,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-11-19 05:00:32,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2023-11-19 05:00:32,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 52 states have (on average 1.8269230769230769) 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) [2023-11-19 05:00:32,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 101 transitions. [2023-11-19 05:00:32,800 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 101 transitions. Word has length 27 [2023-11-19 05:00:32,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:32,801 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 101 transitions. [2023-11-19 05:00:32,801 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (2), 2 states have call predecessors, (2), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-19 05:00:32,801 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 101 transitions. [2023-11-19 05:00:32,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-19 05:00:32,803 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:32,803 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-19 05:00:32,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_803ddc23-1add-41f4-bc97-4b2f8c120151/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0