./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/dll2c_update_all.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version cf1a7837 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/dll2c_update_all.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 6bfeee33a1b1d098a34bec7a761d4de16bc595043f21d77f5851cba758b79f34 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:45:07,079 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:45:07,199 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-12 00:45:07,208 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:45:07,212 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:45:07,244 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:45:07,245 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:45:07,246 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:45:07,247 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:45:07,251 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:45:07,265 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:45:07,266 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:45:07,266 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:45:07,268 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:45:07,268 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:45:07,269 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:45:07,269 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:45:07,270 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:45:07,270 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:45:07,271 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:45:07,271 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:45:07,272 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:45:07,272 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-12 00:45:07,273 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-12 00:45:07,274 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:45:07,274 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:45:07,275 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:45:07,275 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:45:07,275 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:45:07,276 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-12 00:45:07,277 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-12 00:45:07,277 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-12 00:45:07,278 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:45:07,278 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-12 00:45:07,278 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-12 00:45:07,279 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:45:07,279 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:45:07,279 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:45:07,280 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:45:07,280 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:45:07,280 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:45:07,281 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:45:07,281 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:45:07,281 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:45:07,282 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:45:07,282 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:45:07,282 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_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6bfeee33a1b1d098a34bec7a761d4de16bc595043f21d77f5851cba758b79f34 [2023-11-12 00:45:07,620 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:45:07,650 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:45:07,652 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:45:07,654 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:45:07,655 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:45:07,656 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/list-simple/dll2c_update_all.i [2023-11-12 00:45:10,796 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:45:11,055 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:45:11,055 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/sv-benchmarks/c/list-simple/dll2c_update_all.i [2023-11-12 00:45:11,077 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/data/0204b19a3/2f7798d210c94deab31a0289bf517f1a/FLAG12ef8f83b [2023-11-12 00:45:11,097 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/data/0204b19a3/2f7798d210c94deab31a0289bf517f1a [2023-11-12 00:45:11,106 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:45:11,107 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:45:11,113 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:45:11,113 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:45:11,119 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:45:11,119 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:45:11" (1/1) ... [2023-11-12 00:45:11,121 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@70f18d3f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:11, skipping insertion in model container [2023-11-12 00:45:11,121 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:45:11" (1/1) ... [2023-11-12 00:45:11,187 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:45:11,514 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:45:11,525 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:45:11,568 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:45:11,604 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:45:11,605 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:11 WrapperNode [2023-11-12 00:45:11,605 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:45:11,607 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:45:11,607 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:45:11,607 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:45:11,614 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:11" (1/1) ... [2023-11-12 00:45:11,650 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:11" (1/1) ... [2023-11-12 00:45:11,680 INFO L138 Inliner]: procedures = 126, calls = 30, calls flagged for inlining = 8, calls inlined = 8, statements flattened = 144 [2023-11-12 00:45:11,680 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:45:11,681 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:45:11,681 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:45:11,681 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:45:11,690 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:11" (1/1) ... [2023-11-12 00:45:11,690 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:11" (1/1) ... [2023-11-12 00:45:11,714 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:11" (1/1) ... [2023-11-12 00:45:11,715 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:11" (1/1) ... [2023-11-12 00:45:11,729 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:11" (1/1) ... [2023-11-12 00:45:11,735 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:11" (1/1) ... [2023-11-12 00:45:11,742 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:11" (1/1) ... [2023-11-12 00:45:11,749 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:11" (1/1) ... [2023-11-12 00:45:11,753 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:45:11,756 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:45:11,760 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:45:11,761 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:45:11,762 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:11" (1/1) ... [2023-11-12 00:45:11,768 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:45:11,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:11,802 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:45:11,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:45:11,845 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 00:45:11,845 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 00:45:11,846 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-12 00:45:11,846 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-12 00:45:11,846 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-12 00:45:11,846 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:45:11,847 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-12 00:45:11,847 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-12 00:45:11,849 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 00:45:11,849 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:45:11,850 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:45:11,850 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:45:11,987 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:45:11,989 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:45:12,491 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:45:12,560 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:45:12,560 INFO L302 CfgBuilder]: Removed 6 assume(true) statements. [2023-11-12 00:45:12,563 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:45:12 BoogieIcfgContainer [2023-11-12 00:45:12,564 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:45:12,567 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:45:12,567 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:45:12,570 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:45:12,571 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:45:11" (1/3) ... [2023-11-12 00:45:12,571 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5305ef81 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:45:12, skipping insertion in model container [2023-11-12 00:45:12,572 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:11" (2/3) ... [2023-11-12 00:45:12,572 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5305ef81 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:45:12, skipping insertion in model container [2023-11-12 00:45:12,572 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:45:12" (3/3) ... [2023-11-12 00:45:12,574 INFO L112 eAbstractionObserver]: Analyzing ICFG dll2c_update_all.i [2023-11-12 00:45:12,596 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:45:12,597 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 34 error locations. [2023-11-12 00:45:12,651 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:45:12,658 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;@33a77eac, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:45:12,659 INFO L358 AbstractCegarLoop]: Starting to check reachability of 34 error locations. [2023-11-12 00:45:12,664 INFO L276 IsEmpty]: Start isEmpty. Operand has 78 states, 40 states have (on average 2.125) internal successors, (85), 74 states have internal predecessors, (85), 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) [2023-11-12 00:45:12,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-12 00:45:12,671 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:12,672 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-12 00:45:12,673 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:12,678 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:12,679 INFO L85 PathProgramCache]: Analyzing trace with hash 221963993, now seen corresponding path program 1 times [2023-11-12 00:45:12,690 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:12,691 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307281588] [2023-11-12 00:45:12,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:12,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:12,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:12,997 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:45:12,997 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:12,998 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307281588] [2023-11-12 00:45:12,999 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [307281588] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:45:12,999 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:45:12,999 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:45:13,001 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455510330] [2023-11-12 00:45:13,003 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:45:13,007 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:45:13,009 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:13,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:45:13,058 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:45:13,060 INFO L87 Difference]: Start difference. First operand has 78 states, 40 states have (on average 2.125) internal successors, (85), 74 states have internal predecessors, (85), 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, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:45:13,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:13,226 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2023-11-12 00:45:13,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:45:13,229 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 5 [2023-11-12 00:45:13,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:13,240 INFO L225 Difference]: With dead ends: 74 [2023-11-12 00:45:13,240 INFO L226 Difference]: Without dead ends: 72 [2023-11-12 00:45:13,243 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:45:13,250 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 8 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:13,251 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 94 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:45:13,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2023-11-12 00:45:13,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2023-11-12 00:45:13,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 38 states have (on average 2.0) internal successors, (76), 68 states have internal predecessors, (76), 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) [2023-11-12 00:45:13,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 80 transitions. [2023-11-12 00:45:13,294 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 80 transitions. Word has length 5 [2023-11-12 00:45:13,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:13,295 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 80 transitions. [2023-11-12 00:45:13,295 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:45:13,296 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 80 transitions. [2023-11-12 00:45:13,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-12 00:45:13,296 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:13,296 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-12 00:45:13,297 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:45:13,297 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:13,298 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:13,298 INFO L85 PathProgramCache]: Analyzing trace with hash 221963994, now seen corresponding path program 1 times [2023-11-12 00:45:13,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:13,299 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941816180] [2023-11-12 00:45:13,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:13,299 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:13,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:13,454 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:45:13,455 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:13,455 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941816180] [2023-11-12 00:45:13,456 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941816180] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:45:13,456 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:45:13,457 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:45:13,457 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173738342] [2023-11-12 00:45:13,457 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:45:13,458 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:45:13,459 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:13,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:45:13,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:45:13,461 INFO L87 Difference]: Start difference. First operand 72 states and 80 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:45:13,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:13,589 INFO L93 Difference]: Finished difference Result 69 states and 77 transitions. [2023-11-12 00:45:13,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:45:13,589 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 5 [2023-11-12 00:45:13,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:13,591 INFO L225 Difference]: With dead ends: 69 [2023-11-12 00:45:13,591 INFO L226 Difference]: Without dead ends: 69 [2023-11-12 00:45:13,592 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:45:13,593 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 3 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:13,594 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 98 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:45:13,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2023-11-12 00:45:13,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2023-11-12 00:45:13,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 65 states have internal predecessors, (73), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-12 00:45:13,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 77 transitions. [2023-11-12 00:45:13,605 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 77 transitions. Word has length 5 [2023-11-12 00:45:13,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:13,605 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 77 transitions. [2023-11-12 00:45:13,605 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:45:13,606 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 77 transitions. [2023-11-12 00:45:13,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-12 00:45:13,606 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:13,609 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:13,609 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-12 00:45:13,609 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:13,610 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:13,610 INFO L85 PathProgramCache]: Analyzing trace with hash 2000708184, now seen corresponding path program 1 times [2023-11-12 00:45:13,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:13,610 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [354399818] [2023-11-12 00:45:13,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:13,613 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:13,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:13,897 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:45:13,898 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:13,899 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [354399818] [2023-11-12 00:45:13,899 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [354399818] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:45:13,900 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:45:13,900 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-12 00:45:13,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625252886] [2023-11-12 00:45:13,901 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:45:13,902 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-12 00:45:13,903 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:13,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-12 00:45:13,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:45:13,906 INFO L87 Difference]: Start difference. First operand 69 states and 77 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) [2023-11-12 00:45:14,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:14,138 INFO L93 Difference]: Finished difference Result 73 states and 83 transitions. [2023-11-12 00:45:14,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:45:14,144 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 [2023-11-12 00:45:14,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:14,149 INFO L225 Difference]: With dead ends: 73 [2023-11-12 00:45:14,150 INFO L226 Difference]: Without dead ends: 73 [2023-11-12 00:45:14,152 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 [2023-11-12 00:45:14,158 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 7 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:14,158 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 184 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 190 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:45:14,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2023-11-12 00:45:14,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2023-11-12 00:45:14,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 40 states have (on average 1.925) internal successors, (77), 67 states have internal predecessors, (77), 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) [2023-11-12 00:45:14,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 81 transitions. [2023-11-12 00:45:14,179 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 81 transitions. Word has length 11 [2023-11-12 00:45:14,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:14,180 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 81 transitions. [2023-11-12 00:45:14,180 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) [2023-11-12 00:45:14,180 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 81 transitions. [2023-11-12 00:45:14,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-12 00:45:14,181 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:14,181 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:14,181 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-12 00:45:14,182 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:14,182 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:14,182 INFO L85 PathProgramCache]: Analyzing trace with hash 2000708185, now seen corresponding path program 1 times [2023-11-12 00:45:14,182 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:14,183 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631921964] [2023-11-12 00:45:14,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:14,183 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:14,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:14,315 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:45:14,315 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:14,315 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1631921964] [2023-11-12 00:45:14,316 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1631921964] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:45:14,316 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:45:14,316 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:45:14,316 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204508986] [2023-11-12 00:45:14,316 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:45:14,317 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:45:14,317 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:14,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:45:14,318 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:45:14,318 INFO L87 Difference]: Start difference. First operand 71 states and 81 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 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) [2023-11-12 00:45:14,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:14,359 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2023-11-12 00:45:14,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:45:14,360 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 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 [2023-11-12 00:45:14,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:14,361 INFO L225 Difference]: With dead ends: 70 [2023-11-12 00:45:14,361 INFO L226 Difference]: Without dead ends: 70 [2023-11-12 00:45:14,361 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 [2023-11-12 00:45:14,362 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 10 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:14,363 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 104 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:45:14,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2023-11-12 00:45:14,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2023-11-12 00:45:14,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 39 states have (on average 1.8974358974358974) internal successors, (74), 66 states have internal predecessors, (74), 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) [2023-11-12 00:45:14,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 78 transitions. [2023-11-12 00:45:14,371 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 78 transitions. Word has length 11 [2023-11-12 00:45:14,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:14,371 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 78 transitions. [2023-11-12 00:45:14,371 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 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) [2023-11-12 00:45:14,372 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 78 transitions. [2023-11-12 00:45:14,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-12 00:45:14,372 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:14,372 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:14,373 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-12 00:45:14,373 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:14,373 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:14,374 INFO L85 PathProgramCache]: Analyzing trace with hash -1812819673, now seen corresponding path program 1 times [2023-11-12 00:45:14,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:14,374 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [966895582] [2023-11-12 00:45:14,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:14,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:14,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:14,574 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-12 00:45:14,574 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:14,575 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [966895582] [2023-11-12 00:45:14,575 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [966895582] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:45:14,576 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:45:14,576 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-12 00:45:14,576 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529054382] [2023-11-12 00:45:14,576 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:45:14,578 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-12 00:45:14,579 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:14,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-12 00:45:14,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:45:14,580 INFO L87 Difference]: Start difference. First operand 70 states and 78 transitions. Second operand has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:45:14,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:14,759 INFO L93 Difference]: Finished difference Result 69 states and 77 transitions. [2023-11-12 00:45:14,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:45:14,759 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2023-11-12 00:45:14,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:14,761 INFO L225 Difference]: With dead ends: 69 [2023-11-12 00:45:14,761 INFO L226 Difference]: Without dead ends: 69 [2023-11-12 00:45:14,762 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 [2023-11-12 00:45:14,764 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 9 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:14,764 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 179 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:45:14,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2023-11-12 00:45:14,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2023-11-12 00:45:14,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 39 states have (on average 1.8717948717948718) internal successors, (73), 65 states have internal predecessors, (73), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-12 00:45:14,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 77 transitions. [2023-11-12 00:45:14,777 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 77 transitions. Word has length 19 [2023-11-12 00:45:14,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:14,778 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 77 transitions. [2023-11-12 00:45:14,778 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:45:14,778 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 77 transitions. [2023-11-12 00:45:14,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-12 00:45:14,779 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:14,780 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:14,780 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-12 00:45:14,780 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:14,781 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:14,781 INFO L85 PathProgramCache]: Analyzing trace with hash -1812819672, now seen corresponding path program 1 times [2023-11-12 00:45:14,781 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:14,781 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272634035] [2023-11-12 00:45:14,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:14,782 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:14,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:15,067 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:45:15,067 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:15,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272634035] [2023-11-12 00:45:15,068 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [272634035] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:45:15,068 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:45:15,068 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-12 00:45:15,068 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630382223] [2023-11-12 00:45:15,069 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:45:15,069 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-12 00:45:15,069 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:15,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-12 00:45:15,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:45:15,070 INFO L87 Difference]: Start difference. First operand 69 states and 77 transitions. Second operand has 6 states, 4 states have (on average 3.75) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:45:15,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:15,245 INFO L93 Difference]: Finished difference Result 68 states and 76 transitions. [2023-11-12 00:45:15,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:45:15,245 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 3.75) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2023-11-12 00:45:15,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:15,246 INFO L225 Difference]: With dead ends: 68 [2023-11-12 00:45:15,246 INFO L226 Difference]: Without dead ends: 68 [2023-11-12 00:45:15,250 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 [2023-11-12 00:45:15,251 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 7 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:15,252 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 199 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:45:15,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2023-11-12 00:45:15,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2023-11-12 00:45:15,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 39 states have (on average 1.8461538461538463) internal successors, (72), 64 states have internal predecessors, (72), 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) [2023-11-12 00:45:15,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 76 transitions. [2023-11-12 00:45:15,264 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 76 transitions. Word has length 19 [2023-11-12 00:45:15,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:15,265 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 76 transitions. [2023-11-12 00:45:15,265 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 3.75) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:45:15,265 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 76 transitions. [2023-11-12 00:45:15,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-12 00:45:15,266 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:15,266 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:15,266 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-12 00:45:15,266 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:15,267 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:15,267 INFO L85 PathProgramCache]: Analyzing trace with hash 1637016136, now seen corresponding path program 1 times [2023-11-12 00:45:15,267 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:15,267 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [481282875] [2023-11-12 00:45:15,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:15,268 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:15,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:15,621 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:45:15,621 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:15,621 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [481282875] [2023-11-12 00:45:15,621 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [481282875] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:15,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962050746] [2023-11-12 00:45:15,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:15,622 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:15,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:15,625 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:45:15,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:45:15,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:15,776 INFO L262 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-12 00:45:15,789 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:45:15,853 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-12 00:45:15,905 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| (select |c_#valid| |node_create_~temp~0#1.base|))) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-12 00:45:15,976 INFO L322 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-11-12 00:45:15,976 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-11-12 00:45:15,992 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 5 not checked. [2023-11-12 00:45:15,992 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:45:16,098 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962050746] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:16,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [950539958] [2023-11-12 00:45:16,140 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-12 00:45:16,140 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:45:16,146 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:45:16,153 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:45:16,153 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:45:17,685 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 6 for LOIs [2023-11-12 00:45:17,733 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:45:19,415 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1043#(and (= (select |#valid| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 1) (<= 1 |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.base_55| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_55| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.base_55| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0 |ULTIMATE.start_dll_circular_create_~head~0#1.base|)) |#memory_$Pointer$.base|)) (= |ULTIMATE.start_dll_circular_create_#in~data#1| 1) (= |ULTIMATE.start_dll_circular_create_~head~0#1.offset| 0) (exists ((|v_#memory_$Pointer$.offset_55| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_55| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.offset_55| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0 0)))) (= |ULTIMATE.start_dll_circular_create_#in~len#1| 2) (= 2 |ULTIMATE.start_dll_circular_create_~len#1|) (exists ((|v_#memory_int_49| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_49| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base| (store (select |v_#memory_int_49| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0 (select (select |#memory_int| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0))))) (= |ULTIMATE.start_main_~data~0#1| 1) (<= 4 (select |#length| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|)) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_circular_create_~last~0#1.offset| 0) (not (= |ULTIMATE.start_dll_circular_create_~head~0#1.base| 0)) (= |ULTIMATE.start_dll_circular_create_~new_head~0#1.offset| 0) (not (= (select |#valid| |ULTIMATE.start_dll_circular_create_~head~0#1.base|) 1)) (= |ULTIMATE.start_dll_circular_create_~data#1| 1))' at error location [2023-11-12 00:45:19,415 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:45:19,415 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-12 00:45:19,415 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 10 [2023-11-12 00:45:19,415 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391850807] [2023-11-12 00:45:19,416 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-12 00:45:19,416 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-12 00:45:19,416 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:19,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-12 00:45:19,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=477, Unknown=3, NotChecked=44, Total=600 [2023-11-12 00:45:19,418 INFO L87 Difference]: Start difference. First operand 68 states and 76 transitions. Second operand has 11 states, 8 states have (on average 2.75) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-12 00:45:19,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:19,734 INFO L93 Difference]: Finished difference Result 75 states and 85 transitions. [2023-11-12 00:45:19,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 00:45:19,735 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 2.75) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 21 [2023-11-12 00:45:19,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:19,736 INFO L225 Difference]: With dead ends: 75 [2023-11-12 00:45:19,736 INFO L226 Difference]: Without dead ends: 75 [2023-11-12 00:45:19,737 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=90, Invalid=561, Unknown=3, NotChecked=48, Total=702 [2023-11-12 00:45:19,738 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 6 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 286 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 372 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 80 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:19,738 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 223 Invalid, 372 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 286 Invalid, 0 Unknown, 80 Unchecked, 0.3s Time] [2023-11-12 00:45:19,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2023-11-12 00:45:19,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2023-11-12 00:45:19,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 43 states have (on average 1.813953488372093) internal successors, (78), 68 states have internal predecessors, (78), 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) [2023-11-12 00:45:19,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 84 transitions. [2023-11-12 00:45:19,749 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 84 transitions. Word has length 21 [2023-11-12 00:45:19,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:19,749 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 84 transitions. [2023-11-12 00:45:19,749 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 2.75) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-12 00:45:19,750 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 84 transitions. [2023-11-12 00:45:19,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-12 00:45:19,751 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:19,751 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:19,764 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-12 00:45:19,952 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-12 00:45:19,952 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:19,952 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:19,953 INFO L85 PathProgramCache]: Analyzing trace with hash 1637016137, now seen corresponding path program 1 times [2023-11-12 00:45:19,953 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:19,953 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [363677269] [2023-11-12 00:45:19,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:19,953 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:19,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:20,442 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:45:20,442 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:20,442 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [363677269] [2023-11-12 00:45:20,442 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [363677269] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:20,443 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1378754273] [2023-11-12 00:45:20,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:20,443 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:20,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:20,444 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:45:20,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:45:20,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:20,583 INFO L262 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 33 conjunts are in the unsatisfiable core [2023-11-12 00:45:20,586 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:45:20,593 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-12 00:45:20,599 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-12 00:45:20,715 INFO L322 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-12 00:45:20,715 INFO L351 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 [2023-11-12 00:45:20,724 INFO L351 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 [2023-11-12 00:45:20,758 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:45:20,758 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:45:20,898 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1378754273] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:20,899 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1012400231] [2023-11-12 00:45:20,906 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-12 00:45:20,907 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:45:20,907 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:45:20,907 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:45:20,907 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:45:21,702 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 6 for LOIs [2023-11-12 00:45:21,733 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:45:23,508 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1298#(and (= (select |#valid| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 1) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_dll_circular_create_#in~data#1| 1) (= |ULTIMATE.start_dll_circular_create_~head~0#1.offset| 0) (exists ((|v_#memory_$Pointer$.offset_69| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_69| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.offset_69| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0 0)))) (exists ((|v_#memory_int_63| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_63| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base| (store (select |v_#memory_int_63| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0 (select (select |#memory_int| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0))))) (<= (select |#length| |ULTIMATE.start_dll_circular_create_~head~0#1.base|) 7) (= |ULTIMATE.start_dll_circular_create_#in~len#1| 2) (= 2 |ULTIMATE.start_dll_circular_create_~len#1|) (= |ULTIMATE.start_main_~data~0#1| 1) (<= 4 (select |#length| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|)) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_circular_create_~last~0#1.offset| 0) (not (= |ULTIMATE.start_dll_circular_create_~head~0#1.base| 0)) (exists ((|v_#memory_$Pointer$.base_69| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_69| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.base_69| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0 |ULTIMATE.start_dll_circular_create_~head~0#1.base|)) |#memory_$Pointer$.base|)) (= |ULTIMATE.start_dll_circular_create_~new_head~0#1.offset| 0) (= |ULTIMATE.start_dll_circular_create_~data#1| 1))' at error location [2023-11-12 00:45:23,509 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:45:23,509 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-12 00:45:23,509 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 12 [2023-11-12 00:45:23,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337158719] [2023-11-12 00:45:23,510 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-12 00:45:23,510 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-12 00:45:23,510 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:23,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-12 00:45:23,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=662, Unknown=2, NotChecked=0, Total=756 [2023-11-12 00:45:23,512 INFO L87 Difference]: Start difference. First operand 73 states and 84 transitions. Second operand has 13 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-12 00:45:23,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:23,920 INFO L93 Difference]: Finished difference Result 75 states and 85 transitions. [2023-11-12 00:45:23,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-12 00:45:23,921 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 21 [2023-11-12 00:45:23,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:23,922 INFO L225 Difference]: With dead ends: 75 [2023-11-12 00:45:23,922 INFO L226 Difference]: Without dead ends: 75 [2023-11-12 00:45:23,923 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=107, Invalid=761, Unknown=2, NotChecked=0, Total=870 [2023-11-12 00:45:23,924 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 4 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:23,925 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 217 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:45:23,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2023-11-12 00:45:23,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2023-11-12 00:45:23,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 43 states have (on average 1.7906976744186047) internal successors, (77), 68 states have internal predecessors, (77), 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) [2023-11-12 00:45:23,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 83 transitions. [2023-11-12 00:45:23,940 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 83 transitions. Word has length 21 [2023-11-12 00:45:23,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:23,940 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 83 transitions. [2023-11-12 00:45:23,941 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-12 00:45:23,941 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 83 transitions. [2023-11-12 00:45:23,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-12 00:45:23,943 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:23,943 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:23,956 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 00:45:24,150 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-12 00:45:24,150 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:24,151 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:24,151 INFO L85 PathProgramCache]: Analyzing trace with hash 1214636880, now seen corresponding path program 1 times [2023-11-12 00:45:24,151 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:24,151 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993845214] [2023-11-12 00:45:24,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:24,151 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:24,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:24,285 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:45:24,285 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:24,285 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993845214] [2023-11-12 00:45:24,286 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [993845214] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:24,286 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1852925488] [2023-11-12 00:45:24,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:24,286 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:24,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:24,288 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:45:24,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:45:24,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:24,425 INFO L262 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-12 00:45:24,427 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:45:24,451 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:45:24,452 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:45:24,489 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:45:24,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1852925488] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:45:24,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [215882030] [2023-11-12 00:45:24,492 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-12 00:45:24,492 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:45:24,493 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:45:24,493 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:45:24,493 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:45:25,414 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 43 for LOIs [2023-11-12 00:45:25,534 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:45:33,427 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1601#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_dll_circular_create_#in~data#1| 1) (= |ULTIMATE.start_dll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_dll_circular_create_#in~len#1| 2) (not (= (select |#valid| |ULTIMATE.start_dll_circular_create_~last~0#1.base|) 1)) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_circular_create_~last~0#1.offset| 0) (<= |ULTIMATE.start_dll_circular_create_~len#1| 1) (= |ULTIMATE.start_dll_circular_create_~data#1| 1))' at error location [2023-11-12 00:45:33,427 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:45:33,427 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:45:33,427 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 6 [2023-11-12 00:45:33,427 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386861780] [2023-11-12 00:45:33,428 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:45:33,428 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-12 00:45:33,428 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:33,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-12 00:45:33,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=356, Unknown=6, NotChecked=0, Total=420 [2023-11-12 00:45:33,429 INFO L87 Difference]: Start difference. First operand 73 states and 83 transitions. Second operand has 6 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-12 00:45:33,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:33,561 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2023-11-12 00:45:33,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:45:33,562 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2023-11-12 00:45:33,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:33,563 INFO L225 Difference]: With dead ends: 74 [2023-11-12 00:45:33,563 INFO L226 Difference]: Without dead ends: 74 [2023-11-12 00:45:33,563 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=63, Invalid=393, Unknown=6, NotChecked=0, Total=462 [2023-11-12 00:45:33,564 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 3 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:33,564 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 246 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:45:33,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2023-11-12 00:45:33,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2023-11-12 00:45:33,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 43 states have (on average 1.7674418604651163) internal successors, (76), 68 states have internal predecessors, (76), 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) [2023-11-12 00:45:33,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 82 transitions. [2023-11-12 00:45:33,570 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 82 transitions. Word has length 23 [2023-11-12 00:45:33,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:33,570 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 82 transitions. [2023-11-12 00:45:33,571 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-12 00:45:33,571 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 82 transitions. [2023-11-12 00:45:33,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-12 00:45:33,571 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:33,572 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:33,582 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:45:33,772 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-12 00:45:33,773 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:33,773 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:33,773 INFO L85 PathProgramCache]: Analyzing trace with hash -1005934627, now seen corresponding path program 1 times [2023-11-12 00:45:33,773 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:33,773 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986238733] [2023-11-12 00:45:33,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:33,774 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:33,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:33,874 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-12 00:45:33,875 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:33,875 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986238733] [2023-11-12 00:45:33,875 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1986238733] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:33,875 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1312033621] [2023-11-12 00:45:33,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:33,876 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:33,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:33,877 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:45:33,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 00:45:34,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:34,062 INFO L262 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-12 00:45:34,065 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:45:34,096 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-12 00:45:34,097 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:45:34,123 INFO L322 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-11-12 00:45:34,123 INFO L351 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 12 treesize of output 11 [2023-11-12 00:45:34,149 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-12 00:45:34,150 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1312033621] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:45:34,150 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [229380185] [2023-11-12 00:45:34,155 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-12 00:45:34,155 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:45:34,155 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:45:34,156 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:45:34,156 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:45:35,190 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 6 for LOIs [2023-11-12 00:45:35,224 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:45:36,912 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1908#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_dll_circular_create_#in~data#1| 1) (= |ULTIMATE.start_dll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_dll_circular_create_#in~len#1| 2) (not (= (select |#valid| |ULTIMATE.start_dll_circular_create_~last~0#1.base|) 1)) (= |ULTIMATE.start_dll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_circular_create_~last~0#1.offset| 0) (= |ULTIMATE.start_dll_circular_create_~data#1| 1))' at error location [2023-11-12 00:45:36,912 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:45:36,913 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:45:36,913 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 4 [2023-11-12 00:45:36,913 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286210047] [2023-11-12 00:45:36,913 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:45:36,913 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:45:36,914 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:36,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:45:36,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=348, Unknown=7, NotChecked=0, Total=420 [2023-11-12 00:45:36,915 INFO L87 Difference]: Start difference. First operand 73 states and 82 transitions. Second operand has 5 states, 4 states have (on average 4.75) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-12 00:45:37,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:37,070 INFO L93 Difference]: Finished difference Result 78 states and 89 transitions. [2023-11-12 00:45:37,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:45:37,075 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.75) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2023-11-12 00:45:37,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:37,076 INFO L225 Difference]: With dead ends: 78 [2023-11-12 00:45:37,076 INFO L226 Difference]: Without dead ends: 78 [2023-11-12 00:45:37,077 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=71, Invalid=384, Unknown=7, NotChecked=0, Total=462 [2023-11-12 00:45:37,077 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 6 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:37,078 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 163 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:45:37,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2023-11-12 00:45:37,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2023-11-12 00:45:37,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 46 states have (on average 1.7608695652173914) internal successors, (81), 71 states have internal predecessors, (81), 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) [2023-11-12 00:45:37,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 87 transitions. [2023-11-12 00:45:37,084 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 87 transitions. Word has length 24 [2023-11-12 00:45:37,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:37,084 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 87 transitions. [2023-11-12 00:45:37,084 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.75) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-12 00:45:37,085 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 87 transitions. [2023-11-12 00:45:37,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-12 00:45:37,085 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:37,086 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:37,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 00:45:37,292 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-12 00:45:37,293 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:37,293 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:37,293 INFO L85 PathProgramCache]: Analyzing trace with hash -1005934626, now seen corresponding path program 1 times [2023-11-12 00:45:37,293 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:37,293 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201368968] [2023-11-12 00:45:37,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:37,294 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:37,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:37,513 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:45:37,514 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:37,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201368968] [2023-11-12 00:45:37,514 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1201368968] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:37,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1871320320] [2023-11-12 00:45:37,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:37,515 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:37,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:37,516 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:45:37,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 00:45:37,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:37,661 INFO L262 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-12 00:45:37,664 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:45:37,789 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:45:37,789 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:45:37,830 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 00:45:37,830 INFO L351 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 19 treesize of output 23 [2023-11-12 00:45:37,997 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:45:37,997 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1871320320] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:45:37,997 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1692507659] [2023-11-12 00:45:38,000 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-12 00:45:38,001 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:45:38,001 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:45:38,001 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:45:38,002 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:45:39,032 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 6 for LOIs [2023-11-12 00:45:39,060 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:45:40,821 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2233#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_dll_circular_create_#in~data#1| 1) (= |ULTIMATE.start_dll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_dll_circular_create_#in~len#1| 2) (= |ULTIMATE.start_dll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_circular_create_~last~0#1.offset| 0) (<= (select |#length| |ULTIMATE.start_dll_circular_create_~last~0#1.base|) 3) (= |ULTIMATE.start_dll_circular_create_~data#1| 1))' at error location [2023-11-12 00:45:40,821 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:45:40,821 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:45:40,822 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 14 [2023-11-12 00:45:40,822 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618509550] [2023-11-12 00:45:40,822 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:45:40,823 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-12 00:45:40,823 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:40,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-12 00:45:40,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=816, Unknown=2, NotChecked=0, Total=930 [2023-11-12 00:45:40,824 INFO L87 Difference]: Start difference. First operand 76 states and 87 transitions. Second operand has 15 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 13 states have internal predecessors, (43), 4 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2023-11-12 00:45:41,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:41,111 INFO L93 Difference]: Finished difference Result 80 states and 91 transitions. [2023-11-12 00:45:41,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-12 00:45:41,111 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 13 states have internal predecessors, (43), 4 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 24 [2023-11-12 00:45:41,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:41,113 INFO L225 Difference]: With dead ends: 80 [2023-11-12 00:45:41,113 INFO L226 Difference]: Without dead ends: 80 [2023-11-12 00:45:41,113 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=129, Invalid=925, Unknown=2, NotChecked=0, Total=1056 [2023-11-12 00:45:41,114 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 21 mSDsluCounter, 319 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 371 SdHoareTripleChecker+Invalid, 239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:41,115 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 371 Invalid, 239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 238 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:45:41,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-11-12 00:45:41,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 76. [2023-11-12 00:45:41,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 46 states have (on average 1.7391304347826086) internal successors, (80), 71 states have internal predecessors, (80), 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) [2023-11-12 00:45:41,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 86 transitions. [2023-11-12 00:45:41,120 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 86 transitions. Word has length 24 [2023-11-12 00:45:41,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:41,121 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 86 transitions. [2023-11-12 00:45:41,121 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 13 states have internal predecessors, (43), 4 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2023-11-12 00:45:41,121 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 86 transitions. [2023-11-12 00:45:41,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-12 00:45:41,122 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:41,123 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:41,139 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-12 00:45:41,323 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-12 00:45:41,324 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:41,324 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:41,324 INFO L85 PathProgramCache]: Analyzing trace with hash -1119202360, now seen corresponding path program 1 times [2023-11-12 00:45:41,324 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:41,324 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [262647051] [2023-11-12 00:45:41,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:41,325 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:41,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:41,455 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-12 00:45:41,455 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:41,455 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [262647051] [2023-11-12 00:45:41,456 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [262647051] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:45:41,456 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:45:41,456 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-12 00:45:41,456 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237161355] [2023-11-12 00:45:41,456 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:45:41,457 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:45:41,458 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:41,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:45:41,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:45:41,459 INFO L87 Difference]: Start difference. First operand 76 states and 86 transitions. Second operand has 7 states, 5 states have (on average 3.8) internal successors, (19), 6 states have internal predecessors, (19), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:45:41,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:41,688 INFO L93 Difference]: Finished difference Result 76 states and 86 transitions. [2023-11-12 00:45:41,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-12 00:45:41,689 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 3.8) internal successors, (19), 6 states have internal predecessors, (19), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 25 [2023-11-12 00:45:41,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:41,690 INFO L225 Difference]: With dead ends: 76 [2023-11-12 00:45:41,690 INFO L226 Difference]: Without dead ends: 76 [2023-11-12 00:45:41,690 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2023-11-12 00:45:41,691 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 9 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:41,691 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 205 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 234 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:45:41,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-11-12 00:45:41,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2023-11-12 00:45:41,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 46 states have (on average 1.7173913043478262) internal successors, (79), 70 states have internal predecessors, (79), 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) [2023-11-12 00:45:41,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 85 transitions. [2023-11-12 00:45:41,700 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 85 transitions. Word has length 25 [2023-11-12 00:45:41,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:41,701 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 85 transitions. [2023-11-12 00:45:41,701 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 3.8) internal successors, (19), 6 states have internal predecessors, (19), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:45:41,702 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 85 transitions. [2023-11-12 00:45:41,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-12 00:45:41,705 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:41,705 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:41,705 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-11-12 00:45:41,706 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:41,706 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:41,706 INFO L85 PathProgramCache]: Analyzing trace with hash -1119202359, now seen corresponding path program 1 times [2023-11-12 00:45:41,707 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:41,707 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1922321646] [2023-11-12 00:45:41,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:41,708 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:41,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:42,002 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:45:42,003 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:42,003 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1922321646] [2023-11-12 00:45:42,003 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1922321646] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:45:42,003 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:45:42,004 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-12 00:45:42,004 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759010524] [2023-11-12 00:45:42,005 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:45:42,005 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:45:42,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:42,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:45:42,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:45:42,007 INFO L87 Difference]: Start difference. First operand 75 states and 85 transitions. Second operand has 7 states, 5 states have (on average 4.2) internal successors, (21), 6 states have internal predecessors, (21), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:45:42,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:42,220 INFO L93 Difference]: Finished difference Result 74 states and 84 transitions. [2023-11-12 00:45:42,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 00:45:42,221 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 4.2) internal successors, (21), 6 states have internal predecessors, (21), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 25 [2023-11-12 00:45:42,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:42,222 INFO L225 Difference]: With dead ends: 74 [2023-11-12 00:45:42,222 INFO L226 Difference]: Without dead ends: 74 [2023-11-12 00:45:42,222 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-12 00:45:42,223 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 7 mSDsluCounter, 181 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 230 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:42,223 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 230 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:45:42,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2023-11-12 00:45:42,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2023-11-12 00:45:42,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 46 states have (on average 1.6956521739130435) internal successors, (78), 69 states have internal predecessors, (78), 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) [2023-11-12 00:45:42,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 84 transitions. [2023-11-12 00:45:42,227 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 84 transitions. Word has length 25 [2023-11-12 00:45:42,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:42,228 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 84 transitions. [2023-11-12 00:45:42,228 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 4.2) internal successors, (21), 6 states have internal predecessors, (21), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:45:42,228 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 84 transitions. [2023-11-12 00:45:42,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-12 00:45:42,229 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:42,229 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:42,229 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-11-12 00:45:42,230 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:42,230 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:42,230 INFO L85 PathProgramCache]: Analyzing trace with hash -321270645, now seen corresponding path program 1 times [2023-11-12 00:45:42,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:42,230 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782681423] [2023-11-12 00:45:42,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:42,231 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:42,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:42,461 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-12 00:45:42,461 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:42,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1782681423] [2023-11-12 00:45:42,462 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1782681423] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:45:42,462 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:45:42,462 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-12 00:45:42,462 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66937319] [2023-11-12 00:45:42,462 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:45:42,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-12 00:45:42,463 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:42,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-12 00:45:42,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-11-12 00:45:42,466 INFO L87 Difference]: Start difference. First operand 74 states and 84 transitions. Second operand has 9 states, 7 states have (on average 3.142857142857143) internal successors, (22), 8 states have internal predecessors, (22), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:45:42,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:42,774 INFO L93 Difference]: Finished difference Result 99 states and 110 transitions. [2023-11-12 00:45:42,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-12 00:45:42,774 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 3.142857142857143) internal successors, (22), 8 states have internal predecessors, (22), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 28 [2023-11-12 00:45:42,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:42,776 INFO L225 Difference]: With dead ends: 99 [2023-11-12 00:45:42,776 INFO L226 Difference]: Without dead ends: 99 [2023-11-12 00:45:42,776 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2023-11-12 00:45:42,777 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 63 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:42,777 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 219 Invalid, 339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:45:42,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2023-11-12 00:45:42,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 77. [2023-11-12 00:45:42,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 49 states have (on average 1.7142857142857142) internal successors, (84), 72 states have internal predecessors, (84), 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) [2023-11-12 00:45:42,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 90 transitions. [2023-11-12 00:45:42,781 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 90 transitions. Word has length 28 [2023-11-12 00:45:42,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:42,782 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 90 transitions. [2023-11-12 00:45:42,782 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 3.142857142857143) internal successors, (22), 8 states have internal predecessors, (22), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:45:42,782 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 90 transitions. [2023-11-12 00:45:42,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-12 00:45:42,783 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:42,783 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:42,783 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-11-12 00:45:42,783 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:42,784 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:42,784 INFO L85 PathProgramCache]: Analyzing trace with hash -321270644, now seen corresponding path program 1 times [2023-11-12 00:45:42,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:42,784 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1481017830] [2023-11-12 00:45:42,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:42,785 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:42,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:43,150 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:45:43,150 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:43,151 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1481017830] [2023-11-12 00:45:43,151 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1481017830] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:45:43,151 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:45:43,151 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-12 00:45:43,151 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639596748] [2023-11-12 00:45:43,151 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:45:43,152 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-12 00:45:43,152 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:43,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-12 00:45:43,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-11-12 00:45:43,153 INFO L87 Difference]: Start difference. First operand 77 states and 90 transitions. Second operand has 9 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 8 states have internal predecessors, (24), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:45:43,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:43,448 INFO L93 Difference]: Finished difference Result 77 states and 88 transitions. [2023-11-12 00:45:43,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-12 00:45:43,448 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 8 states have internal predecessors, (24), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 28 [2023-11-12 00:45:43,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:43,449 INFO L225 Difference]: With dead ends: 77 [2023-11-12 00:45:43,449 INFO L226 Difference]: Without dead ends: 77 [2023-11-12 00:45:43,450 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2023-11-12 00:45:43,450 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 60 mSDsluCounter, 214 mSDsCounter, 0 mSdLazyCounter, 282 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 282 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:43,451 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 255 Invalid, 283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 282 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:45:43,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2023-11-12 00:45:43,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2023-11-12 00:45:43,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 49 states have (on average 1.6734693877551021) internal successors, (82), 72 states have internal predecessors, (82), 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) [2023-11-12 00:45:43,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 88 transitions. [2023-11-12 00:45:43,455 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 88 transitions. Word has length 28 [2023-11-12 00:45:43,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:43,455 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 88 transitions. [2023-11-12 00:45:43,455 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 8 states have internal predecessors, (24), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:45:43,455 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 88 transitions. [2023-11-12 00:45:43,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-12 00:45:43,456 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:43,457 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:43,457 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-11-12 00:45:43,458 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr14REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:43,458 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:43,458 INFO L85 PathProgramCache]: Analyzing trace with hash -1364600423, now seen corresponding path program 1 times [2023-11-12 00:45:43,459 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:43,459 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [748672688] [2023-11-12 00:45:43,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:43,459 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:43,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:43,539 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-12 00:45:43,539 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:43,539 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [748672688] [2023-11-12 00:45:43,540 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [748672688] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:45:43,540 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:45:43,540 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 00:45:43,540 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992330461] [2023-11-12 00:45:43,540 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:45:43,541 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:45:43,541 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:43,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:45:43,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:45:43,542 INFO L87 Difference]: Start difference. First operand 77 states and 88 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:45:43,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:43,603 INFO L93 Difference]: Finished difference Result 100 states and 114 transitions. [2023-11-12 00:45:43,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:45:43,603 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 29 [2023-11-12 00:45:43,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:43,605 INFO L225 Difference]: With dead ends: 100 [2023-11-12 00:45:43,606 INFO L226 Difference]: Without dead ends: 100 [2023-11-12 00:45:43,606 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:45:43,607 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 95 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:43,607 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [95 Valid, 106 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:45:43,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-11-12 00:45:43,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 79. [2023-11-12 00:45:43,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 51 states have (on average 1.6470588235294117) internal successors, (84), 74 states have internal predecessors, (84), 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) [2023-11-12 00:45:43,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 90 transitions. [2023-11-12 00:45:43,613 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 90 transitions. Word has length 29 [2023-11-12 00:45:43,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:43,614 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 90 transitions. [2023-11-12 00:45:43,614 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:45:43,614 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 90 transitions. [2023-11-12 00:45:43,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-12 00:45:43,615 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:43,615 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:43,616 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-11-12 00:45:43,616 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:43,616 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:43,616 INFO L85 PathProgramCache]: Analyzing trace with hash 492052163, now seen corresponding path program 1 times [2023-11-12 00:45:43,617 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:43,617 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1907353806] [2023-11-12 00:45:43,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:43,617 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:43,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:43,708 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-12 00:45:43,708 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:43,708 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1907353806] [2023-11-12 00:45:43,709 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1907353806] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:45:43,709 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:45:43,709 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 00:45:43,709 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304366383] [2023-11-12 00:45:43,709 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:45:43,710 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:45:43,710 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:43,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:45:43,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:45:43,711 INFO L87 Difference]: Start difference. First operand 79 states and 90 transitions. Second operand has 4 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:45:43,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:43,777 INFO L93 Difference]: Finished difference Result 92 states and 104 transitions. [2023-11-12 00:45:43,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:45:43,778 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 30 [2023-11-12 00:45:43,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:43,779 INFO L225 Difference]: With dead ends: 92 [2023-11-12 00:45:43,779 INFO L226 Difference]: Without dead ends: 92 [2023-11-12 00:45:43,780 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:45:43,780 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 15 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:43,781 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 161 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:45:43,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-11-12 00:45:43,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 80. [2023-11-12 00:45:43,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 52 states have (on average 1.6346153846153846) internal successors, (85), 75 states have internal predecessors, (85), 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) [2023-11-12 00:45:43,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 91 transitions. [2023-11-12 00:45:43,785 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 91 transitions. Word has length 30 [2023-11-12 00:45:43,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:43,786 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 91 transitions. [2023-11-12 00:45:43,786 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:45:43,786 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 91 transitions. [2023-11-12 00:45:43,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-11-12 00:45:43,787 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:43,787 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:43,787 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-11-12 00:45:43,788 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr14REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:43,788 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:43,788 INFO L85 PathProgramCache]: Analyzing trace with hash 582371516, now seen corresponding path program 1 times [2023-11-12 00:45:43,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:43,789 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [522357167] [2023-11-12 00:45:43,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:43,789 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:43,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:43,921 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-12 00:45:43,921 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:43,921 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [522357167] [2023-11-12 00:45:43,922 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [522357167] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:45:43,922 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:45:43,922 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 00:45:43,922 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877638097] [2023-11-12 00:45:43,922 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:45:43,923 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:45:43,923 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:43,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:45:43,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:45:43,924 INFO L87 Difference]: Start difference. First operand 80 states and 91 transitions. Second operand has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:45:44,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:44,059 INFO L93 Difference]: Finished difference Result 104 states and 116 transitions. [2023-11-12 00:45:44,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:45:44,060 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 32 [2023-11-12 00:45:44,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:44,061 INFO L225 Difference]: With dead ends: 104 [2023-11-12 00:45:44,061 INFO L226 Difference]: Without dead ends: 104 [2023-11-12 00:45:44,061 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:45:44,062 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 58 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:44,062 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 137 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:45:44,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2023-11-12 00:45:44,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 83. [2023-11-12 00:45:44,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 55 states have (on average 1.6545454545454545) internal successors, (91), 78 states have internal predecessors, (91), 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) [2023-11-12 00:45:44,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 97 transitions. [2023-11-12 00:45:44,066 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 97 transitions. Word has length 32 [2023-11-12 00:45:44,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:44,066 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 97 transitions. [2023-11-12 00:45:44,067 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:45:44,067 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 97 transitions. [2023-11-12 00:45:44,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-11-12 00:45:44,067 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:44,068 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:44,068 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-11-12 00:45:44,068 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:44,068 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:44,068 INFO L85 PathProgramCache]: Analyzing trace with hash 582371517, now seen corresponding path program 1 times [2023-11-12 00:45:44,069 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:44,069 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [297007452] [2023-11-12 00:45:44,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:44,069 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:44,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:44,172 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-12 00:45:44,173 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:44,173 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [297007452] [2023-11-12 00:45:44,173 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [297007452] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:44,173 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1281352597] [2023-11-12 00:45:44,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:44,174 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:44,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:44,183 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:45:44,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 00:45:44,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:44,392 INFO L262 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-12 00:45:44,395 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:45:44,451 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-12 00:45:44,451 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:45:44,500 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-12 00:45:44,501 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1281352597] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:45:44,501 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1270485823] [2023-11-12 00:45:44,503 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-11-12 00:45:44,504 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:45:44,504 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:45:44,504 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:45:44,504 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:45:45,879 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 6 for LOIs [2023-11-12 00:45:45,910 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:45:48,780 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1270485823] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:45:48,780 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:45:48,780 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [5, 5, 5] total 27 [2023-11-12 00:45:48,781 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345409632] [2023-11-12 00:45:48,781 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:45:48,781 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-12 00:45:48,782 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:48,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-12 00:45:48,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=588, Unknown=2, NotChecked=0, Total=702 [2023-11-12 00:45:48,783 INFO L87 Difference]: Start difference. First operand 83 states and 97 transitions. Second operand has 21 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 17 states have internal predecessors, (23), 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) [2023-11-12 00:45:52,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:52,193 INFO L93 Difference]: Finished difference Result 75 states and 86 transitions. [2023-11-12 00:45:52,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-11-12 00:45:52,194 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 17 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 32 [2023-11-12 00:45:52,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:52,195 INFO L225 Difference]: With dead ends: 75 [2023-11-12 00:45:52,195 INFO L226 Difference]: Without dead ends: 75 [2023-11-12 00:45:52,195 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=112, Invalid=588, Unknown=2, NotChecked=0, Total=702 [2023-11-12 00:45:52,196 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 1 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 621 mSolverCounterSat, 3 mSolverCounterUnsat, 11 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 621 IncrementalHoareTripleChecker+Invalid, 11 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:52,196 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 239 Invalid, 635 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 621 Invalid, 11 Unknown, 0 Unchecked, 3.4s Time] [2023-11-12 00:45:52,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2023-11-12 00:45:52,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2023-11-12 00:45:52,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 51 states have (on average 1.588235294117647) internal successors, (81), 70 states have internal predecessors, (81), 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) [2023-11-12 00:45:52,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 85 transitions. [2023-11-12 00:45:52,200 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 85 transitions. Word has length 32 [2023-11-12 00:45:52,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:52,201 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 85 transitions. [2023-11-12 00:45:52,201 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 17 states have internal predecessors, (23), 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) [2023-11-12 00:45:52,201 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 85 transitions. [2023-11-12 00:45:52,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-12 00:45:52,202 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:52,202 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:52,225 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-11-12 00:45:52,415 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:52,415 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 31 more)] === [2023-11-12 00:45:52,415 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:52,416 INFO L85 PathProgramCache]: Analyzing trace with hash 718640128, now seen corresponding path program 1 times [2023-11-12 00:45:52,416 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:52,416 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583623572] [2023-11-12 00:45:52,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:52,416 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:52,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:53,534 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:45:53,534 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:53,535 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1583623572] [2023-11-12 00:45:53,535 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1583623572] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:53,535 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170803128] [2023-11-12 00:45:53,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:53,535 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:53,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:53,537 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:45:53,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d70c6bad-adfc-4278-af44-a6c2268123b0/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 00:45:53,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:53,744 INFO L262 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 62 conjunts are in the unsatisfiable core [2023-11-12 00:45:53,749 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:45:53,752 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-12 00:45:53,841 INFO L322 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-12 00:45:53,841 INFO L351 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 [2023-11-12 00:45:53,908 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-12 00:45:53,958 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-12 00:45:54,036 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-12 00:45:54,080 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 26 [2023-11-12 00:45:54,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:45:54,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:45:54,202 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 00:45:54,202 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 54 treesize of output 29 [2023-11-12 00:45:54,265 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 00:45:54,265 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 16 [2023-11-12 00:45:54,275 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:45:54,275 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:45:54,296 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1348 (Array Int Int))) (or (not (= v_ArrVal_1348 (let ((.cse0 (+ 8 |c_ULTIMATE.start_dll_circular_update_at_~head#1.offset|))) (store (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_dll_circular_update_at_~head#1.base|) .cse0 (select v_ArrVal_1348 .cse0))))) (= (select |c_#valid| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_dll_circular_update_at_~head#1.base| v_ArrVal_1348) |c_ULTIMATE.start_main_~s~0#1.base|) |c_ULTIMATE.start_main_~s~0#1.offset|)) 1))) is different from false [2023-11-12 00:45:54,443 INFO L322 Elim1Store]: treesize reduction 5, result has 66.7 percent of original size [2023-11-12 00:45:54,443 INFO L351 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 19 treesize of output 18 [2023-11-12 00:45:54,597 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 00:45:54,597 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2023-11-12 00:45:54,603 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 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 30 treesize of output 22 [2023-11-12 00:45:54,613 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-12 00:45:54,715 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1170803128] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:54,716 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [654591314] [2023-11-12 00:45:54,718 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-11-12 00:45:54,718 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:45:54,719 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:45:54,719 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:45:54,719 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:45:56,289 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 6 for LOIs [2023-11-12 00:45:56,318 INFO L180 IcfgInterpreter]: Interpretation finished