./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/sll2c_insert_equal.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/sll2c_insert_equal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 8eaca07dd267d84d5b5f55ad6096951e873362e33b975be77e0f552bdb4e3bcb --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:14:15,101 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:14:15,213 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-23 21:14:15,220 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:14:15,221 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:14:15,260 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:14:15,261 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:14:15,261 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:14:15,262 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:14:15,267 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:14:15,268 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:14:15,268 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:14:15,269 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:14:15,271 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:14:15,271 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:14:15,272 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:14:15,272 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:14:15,273 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:14:15,273 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:14:15,274 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:14:15,274 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:14:15,275 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:14:15,276 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-23 21:14:15,276 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-23 21:14:15,277 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:14:15,278 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:14:15,278 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:14:15,279 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:14:15,279 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:14:15,280 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-23 21:14:15,281 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-23 21:14:15,281 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-23 21:14:15,281 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:14:15,282 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-23 21:14:15,282 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-23 21:14:15,282 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:14:15,282 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:14:15,283 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:14:15,283 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:14:15,283 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:14:15,284 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:14:15,284 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:14:15,284 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:14:15,285 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:14:15,285 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:14:15,285 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:14:15,286 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:14:15,286 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:14:15,286 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_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8eaca07dd267d84d5b5f55ad6096951e873362e33b975be77e0f552bdb4e3bcb [2023-11-23 21:14:15,610 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:14:15,643 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:14:15,646 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:14:15,647 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:14:15,648 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:14:15,649 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/list-simple/sll2c_insert_equal.i [2023-11-23 21:14:18,783 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:14:19,046 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:14:19,047 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/sv-benchmarks/c/list-simple/sll2c_insert_equal.i [2023-11-23 21:14:19,062 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/data/0d9f4dad0/7b204bf6b82c42a1a917827b4babc825/FLAGa9c405d35 [2023-11-23 21:14:19,080 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/data/0d9f4dad0/7b204bf6b82c42a1a917827b4babc825 [2023-11-23 21:14:19,083 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:14:19,085 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:14:19,086 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:14:19,086 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:14:19,094 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:14:19,095 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:14:19" (1/1) ... [2023-11-23 21:14:19,097 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2d0d1f86 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:19, skipping insertion in model container [2023-11-23 21:14:19,097 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:14:19" (1/1) ... [2023-11-23 21:14:19,170 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:14:19,545 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:14:19,558 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:14:19,640 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:14:19,686 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:14:19,686 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:19 WrapperNode [2023-11-23 21:14:19,687 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:14:19,688 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:14:19,688 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:14:19,688 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:14:19,697 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:19" (1/1) ... [2023-11-23 21:14:19,725 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:19" (1/1) ... [2023-11-23 21:14:19,755 INFO L138 Inliner]: procedures = 127, calls = 44, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 152 [2023-11-23 21:14:19,756 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:14:19,757 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:14:19,757 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:14:19,757 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:14:19,768 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:19" (1/1) ... [2023-11-23 21:14:19,768 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:19" (1/1) ... [2023-11-23 21:14:19,773 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:19" (1/1) ... [2023-11-23 21:14:19,773 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:19" (1/1) ... [2023-11-23 21:14:19,784 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:19" (1/1) ... [2023-11-23 21:14:19,788 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:19" (1/1) ... [2023-11-23 21:14:19,791 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:19" (1/1) ... [2023-11-23 21:14:19,793 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:19" (1/1) ... [2023-11-23 21:14:19,797 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:14:19,798 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:14:19,798 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:14:19,798 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:14:19,799 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:19" (1/1) ... [2023-11-23 21:14:19,806 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:14:19,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:14:19,837 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:14:19,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:14:19,906 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 21:14:19,907 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:14:19,907 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-23 21:14:19,907 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-23 21:14:19,907 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 21:14:19,908 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:14:19,908 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:14:19,908 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-23 21:14:19,908 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-23 21:14:19,909 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:14:19,909 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-23 21:14:19,909 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:14:19,909 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:14:19,910 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:14:20,070 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:14:20,073 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:14:20,504 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:14:20,611 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:14:20,611 INFO L309 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-23 21:14:20,613 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:14:20 BoogieIcfgContainer [2023-11-23 21:14:20,614 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:14:20,617 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:14:20,617 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:14:20,622 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:14:20,622 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:14:19" (1/3) ... [2023-11-23 21:14:20,623 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d5128d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:14:20, skipping insertion in model container [2023-11-23 21:14:20,624 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:19" (2/3) ... [2023-11-23 21:14:20,626 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d5128d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:14:20, skipping insertion in model container [2023-11-23 21:14:20,629 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:14:20" (3/3) ... [2023-11-23 21:14:20,630 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2c_insert_equal.i [2023-11-23 21:14:20,652 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:14:20,652 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 52 error locations. [2023-11-23 21:14:20,710 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:14:20,718 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;@668ce161, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:14:20,718 INFO L358 AbstractCegarLoop]: Starting to check reachability of 52 error locations. [2023-11-23 21:14:20,723 INFO L276 IsEmpty]: Start isEmpty. Operand has 108 states, 51 states have (on average 2.2549019607843137) internal successors, (115), 103 states have internal predecessors, (115), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:14:20,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-23 21:14:20,732 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:20,733 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-23 21:14:20,734 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 49 more)] === [2023-11-23 21:14:20,741 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:20,746 INFO L85 PathProgramCache]: Analyzing trace with hash 236219979, now seen corresponding path program 1 times [2023-11-23 21:14:20,758 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:20,759 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633037612] [2023-11-23 21:14:20,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:20,760 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:20,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:21,097 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:14:21,097 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:21,098 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1633037612] [2023-11-23 21:14:21,098 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1633037612] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:14:21,099 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:14:21,099 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:14:21,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810989419] [2023-11-23 21:14:21,102 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:14:21,108 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:14:21,109 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:21,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:14:21,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:14:21,164 INFO L87 Difference]: Start difference. First operand has 108 states, 51 states have (on average 2.2549019607843137) internal successors, (115), 103 states have internal predecessors, (115), 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) 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) [2023-11-23 21:14:21,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:21,370 INFO L93 Difference]: Finished difference Result 105 states and 115 transitions. [2023-11-23 21:14:21,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:14:21,372 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 [2023-11-23 21:14:21,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:21,381 INFO L225 Difference]: With dead ends: 105 [2023-11-23 21:14:21,382 INFO L226 Difference]: Without dead ends: 103 [2023-11-23 21:14:21,384 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:14:21,390 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 6 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:21,391 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 146 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:14:21,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2023-11-23 21:14:21,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2023-11-23 21:14:21,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 49 states have (on average 2.163265306122449) internal successors, (106), 98 states have internal predecessors, (106), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:14:21,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 112 transitions. [2023-11-23 21:14:21,447 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 112 transitions. Word has length 5 [2023-11-23 21:14:21,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:21,447 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 112 transitions. [2023-11-23 21:14:21,447 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) [2023-11-23 21:14:21,448 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 112 transitions. [2023-11-23 21:14:21,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-23 21:14:21,449 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:21,449 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-23 21:14:21,449 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:14:21,450 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 49 more)] === [2023-11-23 21:14:21,451 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:21,451 INFO L85 PathProgramCache]: Analyzing trace with hash 236219980, now seen corresponding path program 1 times [2023-11-23 21:14:21,451 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:21,452 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800594457] [2023-11-23 21:14:21,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:21,452 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:21,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:21,620 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:14:21,621 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:21,621 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800594457] [2023-11-23 21:14:21,622 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1800594457] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:14:21,622 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:14:21,622 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:14:21,622 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835034195] [2023-11-23 21:14:21,623 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:14:21,624 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:14:21,625 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:21,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:14:21,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:14:21,627 INFO L87 Difference]: Start difference. First operand 103 states and 112 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) [2023-11-23 21:14:21,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:21,762 INFO L93 Difference]: Finished difference Result 101 states and 110 transitions. [2023-11-23 21:14:21,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:14:21,763 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 [2023-11-23 21:14:21,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:21,767 INFO L225 Difference]: With dead ends: 101 [2023-11-23 21:14:21,767 INFO L226 Difference]: Without dead ends: 101 [2023-11-23 21:14:21,773 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:14:21,774 INFO L413 NwaCegarLoop]: 92 mSDtfsCounter, 2 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:21,775 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 151 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:14:21,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2023-11-23 21:14:21,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2023-11-23 21:14:21,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 49 states have (on average 2.122448979591837) internal successors, (104), 96 states have internal predecessors, (104), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:14:21,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 110 transitions. [2023-11-23 21:14:21,795 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 110 transitions. Word has length 5 [2023-11-23 21:14:21,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:21,795 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 110 transitions. [2023-11-23 21:14:21,795 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) [2023-11-23 21:14:21,795 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 110 transitions. [2023-11-23 21:14:21,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-23 21:14:21,796 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:21,796 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:21,796 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:14:21,797 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 49 more)] === [2023-11-23 21:14:21,797 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:21,797 INFO L85 PathProgramCache]: Analyzing trace with hash -561581278, now seen corresponding path program 1 times [2023-11-23 21:14:21,798 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:21,798 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1162392562] [2023-11-23 21:14:21,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:21,798 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:21,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:21,923 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:14:21,925 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:21,925 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1162392562] [2023-11-23 21:14:21,926 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1162392562] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:14:21,926 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:14:21,926 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:14:21,926 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1289393266] [2023-11-23 21:14:21,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:14:21,927 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:14:21,928 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:21,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:14:21,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:14:21,931 INFO L87 Difference]: Start difference. First operand 101 states and 110 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:14:21,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:21,987 INFO L93 Difference]: Finished difference Result 107 states and 117 transitions. [2023-11-23 21:14:21,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:14:21,988 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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 10 [2023-11-23 21:14:21,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:21,994 INFO L225 Difference]: With dead ends: 107 [2023-11-23 21:14:21,994 INFO L226 Difference]: Without dead ends: 107 [2023-11-23 21:14:21,998 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:14:22,001 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 4 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:22,002 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 184 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:14:22,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2023-11-23 21:14:22,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 102. [2023-11-23 21:14:22,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 50 states have (on average 2.1) internal successors, (105), 97 states have internal predecessors, (105), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:14:22,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 111 transitions. [2023-11-23 21:14:22,012 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 111 transitions. Word has length 10 [2023-11-23 21:14:22,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:22,013 INFO L495 AbstractCegarLoop]: Abstraction has 102 states and 111 transitions. [2023-11-23 21:14:22,013 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:14:22,013 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 111 transitions. [2023-11-23 21:14:22,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-23 21:14:22,014 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:22,014 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:22,014 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 21:14:22,015 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 49 more)] === [2023-11-23 21:14:22,015 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:22,015 INFO L85 PathProgramCache]: Analyzing trace with hash -1249894050, now seen corresponding path program 1 times [2023-11-23 21:14:22,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:22,016 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1859290508] [2023-11-23 21:14:22,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:22,016 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:22,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:22,233 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:14:22,233 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:22,233 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1859290508] [2023-11-23 21:14:22,234 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1859290508] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:14:22,234 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:14:22,234 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 21:14:22,235 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82626979] [2023-11-23 21:14:22,235 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:14:22,235 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:14:22,236 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:22,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:14:22,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:14:22,237 INFO L87 Difference]: Start difference. First operand 102 states and 111 transitions. Second operand has 6 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 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) [2023-11-23 21:14:22,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:22,493 INFO L93 Difference]: Finished difference Result 101 states and 110 transitions. [2023-11-23 21:14:22,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:14:22,494 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 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 17 [2023-11-23 21:14:22,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:22,496 INFO L225 Difference]: With dead ends: 101 [2023-11-23 21:14:22,496 INFO L226 Difference]: Without dead ends: 101 [2023-11-23 21:14:22,497 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:14:22,500 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 3 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:22,504 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 293 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:14:22,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2023-11-23 21:14:22,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2023-11-23 21:14:22,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 50 states have (on average 2.08) internal successors, (104), 96 states have internal predecessors, (104), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:14:22,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 110 transitions. [2023-11-23 21:14:22,518 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 110 transitions. Word has length 17 [2023-11-23 21:14:22,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:22,519 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 110 transitions. [2023-11-23 21:14:22,519 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 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) [2023-11-23 21:14:22,519 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 110 transitions. [2023-11-23 21:14:22,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-23 21:14:22,521 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:22,521 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:22,522 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 21:14:22,522 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 49 more)] === [2023-11-23 21:14:22,523 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:22,523 INFO L85 PathProgramCache]: Analyzing trace with hash -1249894049, now seen corresponding path program 1 times [2023-11-23 21:14:22,523 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:22,524 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [550180376] [2023-11-23 21:14:22,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:22,524 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:22,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:22,786 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:14:22,786 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:22,786 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [550180376] [2023-11-23 21:14:22,787 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [550180376] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:14:22,787 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:14:22,787 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 21:14:22,787 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116177890] [2023-11-23 21:14:22,787 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:14:22,790 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:14:22,790 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:22,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:14:22,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:14:22,791 INFO L87 Difference]: Start difference. First operand 101 states and 110 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) [2023-11-23 21:14:22,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:22,978 INFO L93 Difference]: Finished difference Result 100 states and 109 transitions. [2023-11-23 21:14:22,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:14:22,978 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 17 [2023-11-23 21:14:22,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:22,979 INFO L225 Difference]: With dead ends: 100 [2023-11-23 21:14:22,979 INFO L226 Difference]: Without dead ends: 100 [2023-11-23 21:14:22,980 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:14:22,980 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 1 mSDsluCounter, 228 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:22,981 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 317 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:14:22,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-11-23 21:14:22,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2023-11-23 21:14:22,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 50 states have (on average 2.06) internal successors, (103), 95 states have internal predecessors, (103), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:14:22,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 109 transitions. [2023-11-23 21:14:22,997 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 109 transitions. Word has length 17 [2023-11-23 21:14:22,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:22,998 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 109 transitions. [2023-11-23 21:14:22,998 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) [2023-11-23 21:14:22,998 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 109 transitions. [2023-11-23 21:14:22,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-23 21:14:22,999 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:22,999 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:22,999 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-23 21:14:22,999 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 49 more)] === [2023-11-23 21:14:23,000 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:23,000 INFO L85 PathProgramCache]: Analyzing trace with hash 1442864927, now seen corresponding path program 1 times [2023-11-23 21:14:23,000 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:23,000 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [379610593] [2023-11-23 21:14:23,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:23,001 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:23,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:23,332 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:14:23,332 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:23,333 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [379610593] [2023-11-23 21:14:23,333 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [379610593] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:23,333 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1204482625] [2023-11-23 21:14:23,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:23,333 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:23,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:14:23,336 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:14:23,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:14:23,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:23,475 INFO L262 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 23 conjunts are in the unsatisfiable core [2023-11-23 21:14:23,481 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:14:23,538 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 21:14:23,627 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-23 21:14:23,628 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 13 [2023-11-23 21:14:23,708 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:14:23,708 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:14:24,121 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:14:24,122 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1204482625] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:14:24,122 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [891478947] [2023-11-23 21:14:24,141 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:14:24,142 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:14:24,146 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:14:24,152 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:14:24,153 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:14:25,753 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-23 21:14:25,909 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:14:27,943 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1283#(and (not (= (select |#valid| |ULTIMATE.start_sll_circular_create_~last~0#1.base|) 1)) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_create_#in~data#1| 1) (= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 0) (<= |ULTIMATE.start_sll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_circular_create_~data#1| 1))' at error location [2023-11-23 21:14:27,944 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:14:27,944 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:14:27,944 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 17 [2023-11-23 21:14:27,944 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188432188] [2023-11-23 21:14:27,944 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:14:27,945 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-23 21:14:27,945 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:27,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-23 21:14:27,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=749, Unknown=0, NotChecked=0, Total=870 [2023-11-23 21:14:27,947 INFO L87 Difference]: Start difference. First operand 100 states and 109 transitions. Second operand has 18 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-23 21:14:28,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:28,558 INFO L93 Difference]: Finished difference Result 99 states and 108 transitions. [2023-11-23 21:14:28,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 21:14:28,559 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 19 [2023-11-23 21:14:28,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:28,560 INFO L225 Difference]: With dead ends: 99 [2023-11-23 21:14:28,560 INFO L226 Difference]: Without dead ends: 99 [2023-11-23 21:14:28,561 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=133, Invalid=797, Unknown=0, NotChecked=0, Total=930 [2023-11-23 21:14:28,562 INFO L413 NwaCegarLoop]: 85 mSDtfsCounter, 4 mSDsluCounter, 523 mSDsCounter, 0 mSdLazyCounter, 624 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 608 SdHoareTripleChecker+Invalid, 630 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 624 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:28,562 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 608 Invalid, 630 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 624 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-23 21:14:28,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2023-11-23 21:14:28,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2023-11-23 21:14:28,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 50 states have (on average 2.04) internal successors, (102), 94 states have internal predecessors, (102), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:14:28,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 108 transitions. [2023-11-23 21:14:28,569 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 108 transitions. Word has length 19 [2023-11-23 21:14:28,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:28,569 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 108 transitions. [2023-11-23 21:14:28,570 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-23 21:14:28,570 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 108 transitions. [2023-11-23 21:14:28,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-23 21:14:28,571 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:28,571 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:28,599 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-23 21:14:28,792 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:28,793 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 49 more)] === [2023-11-23 21:14:28,793 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:28,793 INFO L85 PathProgramCache]: Analyzing trace with hash 1442864928, now seen corresponding path program 1 times [2023-11-23 21:14:28,793 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:28,794 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1895057676] [2023-11-23 21:14:28,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:28,794 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:28,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:29,184 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:14:29,184 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:29,185 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1895057676] [2023-11-23 21:14:29,185 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1895057676] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:29,185 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1205793209] [2023-11-23 21:14:29,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:29,186 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:29,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:14:29,188 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:14:29,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:14:29,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:29,325 INFO L262 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 37 conjunts are in the unsatisfiable core [2023-11-23 21:14:29,328 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:14:29,337 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 21:14:29,344 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-23 21:14:29,588 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-23 21:14:29,588 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 13 [2023-11-23 21:14:29,606 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-23 21:14:29,606 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-23 21:14:29,672 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:14:29,672 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:14:29,851 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1205793209] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:29,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [47516321] [2023-11-23 21:14:29,857 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:14:29,857 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:14:29,857 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:14:29,858 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:14:29,858 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:14:31,057 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-23 21:14:31,216 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:14:33,549 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1584#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_create_#in~data#1| 1) (= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 0) (<= (select |#length| |ULTIMATE.start_sll_circular_create_~last~0#1.base|) 3) (<= |ULTIMATE.start_sll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_circular_create_~data#1| 1))' at error location [2023-11-23 21:14:33,549 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:14:33,549 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:14:33,549 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10] total 17 [2023-11-23 21:14:33,549 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131526971] [2023-11-23 21:14:33,550 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:14:33,550 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-23 21:14:33,550 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:33,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-23 21:14:33,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=888, Unknown=0, NotChecked=0, Total=992 [2023-11-23 21:14:33,552 INFO L87 Difference]: Start difference. First operand 99 states and 108 transitions. Second operand has 18 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-23 21:14:34,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:34,280 INFO L93 Difference]: Finished difference Result 100 states and 110 transitions. [2023-11-23 21:14:34,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 21:14:34,281 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 19 [2023-11-23 21:14:34,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:34,282 INFO L225 Difference]: With dead ends: 100 [2023-11-23 21:14:34,282 INFO L226 Difference]: Without dead ends: 100 [2023-11-23 21:14:34,283 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=144, Invalid=1188, Unknown=0, NotChecked=0, Total=1332 [2023-11-23 21:14:34,285 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 4 mSDsluCounter, 597 mSDsCounter, 0 mSdLazyCounter, 776 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 681 SdHoareTripleChecker+Invalid, 781 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 776 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:34,285 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 681 Invalid, 781 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 776 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-23 21:14:34,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-11-23 21:14:34,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 98. [2023-11-23 21:14:34,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 50 states have (on average 2.02) internal successors, (101), 93 states have internal predecessors, (101), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:14:34,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 107 transitions. [2023-11-23 21:14:34,290 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 107 transitions. Word has length 19 [2023-11-23 21:14:34,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:34,290 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 107 transitions. [2023-11-23 21:14:34,291 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-23 21:14:34,291 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 107 transitions. [2023-11-23 21:14:34,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-23 21:14:34,292 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:34,292 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:34,310 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:14:34,505 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-23 21:14:34,505 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 49 more)] === [2023-11-23 21:14:34,506 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:34,508 INFO L85 PathProgramCache]: Analyzing trace with hash 1114399102, now seen corresponding path program 1 times [2023-11-23 21:14:34,508 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:34,508 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053227413] [2023-11-23 21:14:34,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:34,509 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:34,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:35,145 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:14:35,145 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:35,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053227413] [2023-11-23 21:14:35,146 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2053227413] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:35,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [882677564] [2023-11-23 21:14:35,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:35,146 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:35,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:14:35,147 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:14:35,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:14:35,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:35,301 INFO L262 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 23 conjunts are in the unsatisfiable core [2023-11-23 21:14:35,306 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:14:35,311 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 21:14:35,319 INFO L378 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 [2023-11-23 21:14:35,328 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 [2023-11-23 21:14:35,363 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-11-23 21:14:35,363 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-11-23 21:14:35,379 INFO L378 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 [2023-11-23 21:14:35,392 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| (select |c_#valid| |node_create_~temp~0#1.base|))))) is different from true [2023-11-23 21:14:35,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:14:35,443 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-23 21:14:35,501 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-11-23 21:14:35,502 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-11-23 21:14:35,506 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 8 not checked. [2023-11-23 21:14:35,506 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:14:35,555 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [882677564] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:35,555 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1848167438] [2023-11-23 21:14:35,558 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-23 21:14:35,558 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:14:35,559 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:14:35,559 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:14:35,560 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:14:36,934 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 6 for LOIs [2023-11-23 21:14:36,957 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:14:41,205 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1907#(and (= |ULTIMATE.start_sll_circular_insert_~snd_to_last~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_insert_~new_node~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_insert_#in~head#1.offset| 0) (= |ULTIMATE.start_sll_circular_insert_#in~index#1| 1) (= |ULTIMATE.start_sll_circular_insert_~index#1| 1) (= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (or (and (exists ((|v_#memory_$Pointer$.offset_117| (Array Int (Array Int Int))) (|v_old(#valid)_AFTER_CALL_31| (Array Int Int)) (|v_#memory_$Pointer$.base_117| (Array Int (Array Int Int))) (|v_old(#length)_AFTER_CALL_31| (Array Int Int)) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| Int) (|v_#memory_int_93| (Array Int (Array Int Int))) (|v_old(#memory_int)_AFTER_CALL_31| (Array Int (Array Int Int)))) (and (<= 4 (select |v_old(#length)_AFTER_CALL_31| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|)) (= |v_old(#memory_int)_AFTER_CALL_31| (store |v_#memory_int_93| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_int_93| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 (select (select |v_old(#memory_int)_AFTER_CALL_31| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0)))) (= |ULTIMATE.start_sll_circular_create_#res#1.base| (select (select (store |v_#memory_$Pointer$.base_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_$Pointer$.base_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|)) |ULTIMATE.start_main_~#s~0#1.base|) 0)) (= (select (select (store |v_#memory_$Pointer$.offset_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_$Pointer$.offset_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0) (= (select |v_old(#valid)_AFTER_CALL_31| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 1))) (not (= |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 0)) (<= (+ |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#memory_int_89| (Array Int (Array Int Int))) (|v_#memory_int_90| (Array Int (Array Int Int)))) (and (= |#memory_int| (store |v_#memory_int_90| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (select |v_#memory_int_90| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 4 1))) (= |v_#memory_int_90| (store |v_#memory_int_89| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (select |v_#memory_int_89| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0 (select (select |v_#memory_int_90| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0)))))) (exists ((|v_#memory_$Pointer$.base_113| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_113| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.base_113| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 4))) |#memory_$Pointer$.base|)) (exists ((|v_#valid_138| (Array Int Int))) (and (= (store |v_#valid_138| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 1) |#valid|) (= (select |v_#valid_138| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0))) (exists ((|v_#memory_$Pointer$.offset_113| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_113| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_113| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 4))))) (= |ULTIMATE.start_sll_circular_insert_~head#1.base| |ULTIMATE.start_sll_circular_insert_#in~head#1.base|) (exists ((|v_#length_113| (Array Int Int))) (= |#length| (store |v_#length_113| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 8))) (= |ULTIMATE.start_sll_circular_insert_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|)) (and (exists ((|v_old(#valid)_AFTER_CALL_30| (Array Int Int)) (|v_#memory_$Pointer$.offset_117| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_117| (Array Int (Array Int Int))) (|v_old(#memory_int)_AFTER_CALL_30| (Array Int (Array Int Int))) (|v_#length_BEFORE_CALL_52| (Array Int Int)) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| Int) (|v_#memory_int_93| (Array Int (Array Int Int)))) (and (= |v_old(#memory_int)_AFTER_CALL_30| (store |v_#memory_int_93| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_int_93| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 (select (select |v_old(#memory_int)_AFTER_CALL_30| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0)))) (= (select |v_old(#valid)_AFTER_CALL_30| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 1) (= |ULTIMATE.start_sll_circular_create_#res#1.base| (select (select (store |v_#memory_$Pointer$.base_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_$Pointer$.base_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|)) |ULTIMATE.start_main_~#s~0#1.base|) 0)) (= (select (select (store |v_#memory_$Pointer$.offset_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_$Pointer$.offset_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0) (<= 4 (select |v_#length_BEFORE_CALL_52| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|)))) (not (= |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 0)) (<= (+ |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#memory_int_89| (Array Int (Array Int Int))) (|v_#memory_int_90| (Array Int (Array Int Int)))) (and (= |#memory_int| (store |v_#memory_int_90| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (select |v_#memory_int_90| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 4 1))) (= |v_#memory_int_90| (store |v_#memory_int_89| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (select |v_#memory_int_89| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0 (select (select |v_#memory_int_90| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0)))))) (exists ((|v_#memory_$Pointer$.base_113| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_113| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.base_113| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 4))) |#memory_$Pointer$.base|)) (exists ((|v_#valid_138| (Array Int Int))) (and (= (store |v_#valid_138| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 1) |#valid|) (= (select |v_#valid_138| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0))) (exists ((|v_#memory_$Pointer$.offset_113| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_113| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_113| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 4))))) (= |ULTIMATE.start_sll_circular_insert_~head#1.base| |ULTIMATE.start_sll_circular_insert_#in~head#1.base|) (exists ((|v_#length_113| (Array Int Int))) (= |#length| (store |v_#length_113| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 8))) (= |ULTIMATE.start_sll_circular_insert_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|))) (= |ULTIMATE.start_sll_circular_insert_~snd_to_last~0#1.base| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_circular_insert_~head#1.offset| 0) (<= 2 |ULTIMATE.start_sll_circular_insert_#in~head#1.base|) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= 1 |ULTIMATE.start_sll_circular_insert_~data#1|) (= |ULTIMATE.start_sll_circular_insert_#in~data#1| 1) (not (= (select |#valid| |ULTIMATE.start_sll_circular_insert_~head#1.base|) 1)))' at error location [2023-11-23 21:14:41,206 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:14:41,206 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:14:41,206 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 13 [2023-11-23 21:14:41,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553480114] [2023-11-23 21:14:41,206 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:14:41,207 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-23 21:14:41,207 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:41,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-23 21:14:41,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=731, Unknown=3, NotChecked=110, Total=930 [2023-11-23 21:14:41,209 INFO L87 Difference]: Start difference. First operand 98 states and 107 transitions. Second operand has 15 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 13 states have internal predecessors, (29), 2 states have call successors, (3), 1 states have call predecessors, (3), 5 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-23 21:14:41,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:41,755 INFO L93 Difference]: Finished difference Result 107 states and 117 transitions. [2023-11-23 21:14:41,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:14:41,755 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 13 states have internal predecessors, (29), 2 states have call successors, (3), 1 states have call predecessors, (3), 5 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 27 [2023-11-23 21:14:41,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:41,757 INFO L225 Difference]: With dead ends: 107 [2023-11-23 21:14:41,757 INFO L226 Difference]: Without dead ends: 107 [2023-11-23 21:14:41,758 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=101, Invalid=834, Unknown=3, NotChecked=118, Total=1056 [2023-11-23 21:14:41,759 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 120 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 475 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 295 SdHoareTripleChecker+Invalid, 710 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 475 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 224 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:41,759 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [120 Valid, 295 Invalid, 710 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 475 Invalid, 0 Unknown, 224 Unchecked, 0.4s Time] [2023-11-23 21:14:41,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2023-11-23 21:14:41,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 90. [2023-11-23 21:14:41,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 50 states have (on average 1.86) internal successors, (93), 85 states have internal predecessors, (93), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:14:41,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 99 transitions. [2023-11-23 21:14:41,765 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 99 transitions. Word has length 27 [2023-11-23 21:14:41,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:41,765 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 99 transitions. [2023-11-23 21:14:41,766 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 13 states have internal predecessors, (29), 2 states have call successors, (3), 1 states have call predecessors, (3), 5 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-23 21:14:41,766 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 99 transitions. [2023-11-23 21:14:41,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-23 21:14:41,767 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:41,767 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:41,806 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-23 21:14:41,973 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-23 21:14:41,973 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 49 more)] === [2023-11-23 21:14:41,974 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:41,974 INFO L85 PathProgramCache]: Analyzing trace with hash 1114399103, now seen corresponding path program 1 times [2023-11-23 21:14:41,974 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:41,974 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812110210] [2023-11-23 21:14:41,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:41,975 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:42,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:42,953 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:14:42,953 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:42,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812110210] [2023-11-23 21:14:42,953 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812110210] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:42,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1739974435] [2023-11-23 21:14:42,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:42,953 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:42,954 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:14:42,954 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:14:42,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:14:43,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:43,121 INFO L262 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-23 21:14:43,128 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:14:43,134 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-23 21:14:43,149 INFO L378 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 [2023-11-23 21:14:43,160 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= (store |c_old(#length)| |node_create_~temp~0#1.base| (select |c_#length| |node_create_~temp~0#1.base|)) |c_#length|))) is different from true [2023-11-23 21:14:43,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:14:43,189 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-23 21:14:43,216 INFO L378 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 [2023-11-23 21:14:43,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:14:43,252 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-23 21:14:43,295 INFO L378 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 [2023-11-23 21:14:43,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:14:43,328 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-23 21:14:43,335 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-23 21:14:43,335 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:14:43,336 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1739974435] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:14:43,336 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:14:43,336 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [12] total 13 [2023-11-23 21:14:43,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249705947] [2023-11-23 21:14:43,337 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:14:43,338 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:14:43,338 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:43,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:14:43,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=144, Unknown=1, NotChecked=24, Total=210 [2023-11-23 21:14:43,340 INFO L87 Difference]: Start difference. First operand 90 states and 99 transitions. Second operand has 7 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 21:14:43,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:43,535 INFO L93 Difference]: Finished difference Result 85 states and 94 transitions. [2023-11-23 21:14:43,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 21:14:43,537 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2023-11-23 21:14:43,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:43,538 INFO L225 Difference]: With dead ends: 85 [2023-11-23 21:14:43,538 INFO L226 Difference]: Without dead ends: 85 [2023-11-23 21:14:43,538 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=167, Unknown=1, NotChecked=26, Total=240 [2023-11-23 21:14:43,539 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 30 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 115 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:43,539 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 188 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 150 Invalid, 0 Unknown, 115 Unchecked, 0.2s Time] [2023-11-23 21:14:43,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2023-11-23 21:14:43,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2023-11-23 21:14:43,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 50 states have (on average 1.76) internal successors, (88), 80 states have internal predecessors, (88), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:14:43,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 94 transitions. [2023-11-23 21:14:43,544 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 94 transitions. Word has length 27 [2023-11-23 21:14:43,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:43,544 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 94 transitions. [2023-11-23 21:14:43,544 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 21:14:43,548 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 94 transitions. [2023-11-23 21:14:43,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-23 21:14:43,549 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:43,550 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:43,579 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:14:43,750 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:43,751 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 49 more)] === [2023-11-23 21:14:43,751 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:43,751 INFO L85 PathProgramCache]: Analyzing trace with hash 1490859481, now seen corresponding path program 1 times [2023-11-23 21:14:43,751 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:43,751 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83722368] [2023-11-23 21:14:43,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:43,752 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:43,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:44,377 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:14:44,377 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:44,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83722368] [2023-11-23 21:14:44,378 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [83722368] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:44,378 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1263720383] [2023-11-23 21:14:44,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:44,378 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:44,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:14:44,380 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:14:44,409 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:14:44,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:44,744 INFO L262 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 57 conjunts are in the unsatisfiable core [2023-11-23 21:14:44,749 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:14:44,753 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 21:14:44,867 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-23 21:14:44,868 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 13 [2023-11-23 21:14:44,966 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-23 21:14:44,966 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 17 [2023-11-23 21:14:45,303 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| (select |c_#valid| |node_create_~temp~0#1.base|))) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| |node_create_~temp~0#1.base| (select |c_#memory_$Pointer$.base| |node_create_~temp~0#1.base|))) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-23 21:14:45,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:14:45,317 INFO L378 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 18 treesize of output 13 [2023-11-23 21:14:45,360 INFO L349 Elim1Store]: treesize reduction 64, result has 29.7 percent of original size [2023-11-23 21:14:45,360 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 28 treesize of output 36 [2023-11-23 21:14:45,380 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 17 treesize of output 9 [2023-11-23 21:14:45,407 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 2 not checked. [2023-11-23 21:14:45,407 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:14:45,521 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1263720383] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:45,521 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1498374382] [2023-11-23 21:14:45,523 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-23 21:14:45,523 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:14:45,524 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:14:45,524 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:14:45,524 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:14:47,068 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 6 for LOIs [2023-11-23 21:14:47,093 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:14:54,660 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2516#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_insert_~new_node~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_insert_#in~head#1.offset| 0) (= (select |#valid| |ULTIMATE.start_sll_circular_insert_~head#1.base|) 1) (= |ULTIMATE.start_sll_circular_insert_#in~index#1| 1) (= |ULTIMATE.start_sll_circular_insert_~index#1| 1) (= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (or (and (exists ((|v_old(#memory_int)_AFTER_CALL_49| (Array Int (Array Int Int))) (|v_old(#length)_AFTER_CALL_49| (Array Int Int)) (|v_#memory_$Pointer$.offset_129| (Array Int (Array Int Int))) (|v_#memory_int_105| (Array Int (Array Int Int))) (|v_old(#valid)_AFTER_CALL_49| (Array Int Int)) (|v_#memory_$Pointer$.base_133| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| Int)) (and (= |ULTIMATE.start_sll_circular_create_#res#1.base| (select (select (store |v_#memory_$Pointer$.base_133| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| (store (select |v_#memory_$Pointer$.base_133| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|)) |ULTIMATE.start_main_~#s~0#1.base|) 0)) (<= 4 (select |v_old(#length)_AFTER_CALL_49| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|)) (= (select (select (store |v_#memory_$Pointer$.offset_129| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| (store (select |v_#memory_$Pointer$.offset_129| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0) (= (select |v_old(#valid)_AFTER_CALL_49| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 1) (= |v_old(#memory_int)_AFTER_CALL_49| (store |v_#memory_int_105| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| (store (select |v_#memory_int_105| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0 (select (select |v_old(#memory_int)_AFTER_CALL_49| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0)))))) (exists ((|v_#valid_151| (Array Int Int))) (and (= (select |v_#valid_151| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0) (= (store |v_#valid_151| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 1) |#valid|))) (not (= |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 0)) (<= (+ |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.base_129| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_129| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.base_129| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 4))) |#memory_$Pointer$.base|)) (exists ((|v_#memory_int_101| (Array Int (Array Int Int))) (|v_#memory_int_102| (Array Int (Array Int Int)))) (and (= (store |v_#memory_int_101| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (select |v_#memory_int_101| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0 (select (select |v_#memory_int_102| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0))) |v_#memory_int_102|) (= |#memory_int| (store |v_#memory_int_102| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (select |v_#memory_int_102| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 4 1))))) (exists ((|v_#memory_$Pointer$.offset_125| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_125| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_125| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 4))))) (= |ULTIMATE.start_sll_circular_insert_~head#1.base| |ULTIMATE.start_sll_circular_insert_#in~head#1.base|) (exists ((|v_#length_124| (Array Int Int))) (= |#length| (store |v_#length_124| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 8))) (= |ULTIMATE.start_sll_circular_insert_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|)) (and (exists ((|v_#valid_151| (Array Int Int))) (and (= (select |v_#valid_151| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0) (= (store |v_#valid_151| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 1) |#valid|))) (not (= |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 0)) (<= (+ |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.base_129| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_129| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.base_129| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 4))) |#memory_$Pointer$.base|)) (exists ((|v_#memory_int_101| (Array Int (Array Int Int))) (|v_#memory_int_102| (Array Int (Array Int Int)))) (and (= (store |v_#memory_int_101| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (select |v_#memory_int_101| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0 (select (select |v_#memory_int_102| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0))) |v_#memory_int_102|) (= |#memory_int| (store |v_#memory_int_102| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (select |v_#memory_int_102| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 4 1))))) (exists ((|v_#memory_$Pointer$.offset_125| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_125| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_125| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 4))))) (= |ULTIMATE.start_sll_circular_insert_~head#1.base| |ULTIMATE.start_sll_circular_insert_#in~head#1.base|) (exists ((|v_#memory_$Pointer$.offset_129| (Array Int (Array Int Int))) (|v_#memory_int_105| (Array Int (Array Int Int))) (|v_old(#valid)_AFTER_CALL_48| (Array Int Int)) (|v_#length_BEFORE_CALL_86| (Array Int Int)) (|v_#memory_$Pointer$.base_133| (Array Int (Array Int Int))) (|v_#memory_int_BEFORE_CALL_78| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| Int)) (and (= |ULTIMATE.start_sll_circular_create_#res#1.base| (select (select (store |v_#memory_$Pointer$.base_133| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| (store (select |v_#memory_$Pointer$.base_133| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|)) |ULTIMATE.start_main_~#s~0#1.base|) 0)) (= (select |v_old(#valid)_AFTER_CALL_48| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 1) (= (select (select (store |v_#memory_$Pointer$.offset_129| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| (store (select |v_#memory_$Pointer$.offset_129| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0) (= (store |v_#memory_int_105| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| (store (select |v_#memory_int_105| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0 (select (select |v_#memory_int_BEFORE_CALL_78| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0))) |v_#memory_int_BEFORE_CALL_78|) (<= 4 (select |v_#length_BEFORE_CALL_86| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|)))) (exists ((|v_#length_124| (Array Int Int))) (= |#length| (store |v_#length_124| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 8))) (= |ULTIMATE.start_sll_circular_insert_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|))) (<= 4 (select |#length| |ULTIMATE.start_sll_circular_insert_~head#1.base|)) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_circular_insert_~snd_to_last~0#1.base| |ULTIMATE.start_sll_circular_insert_~last~1#1.base|) (= |ULTIMATE.start_sll_circular_insert_~head#1.offset| 0) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_insert_~snd_to_last~0#1.offset| |ULTIMATE.start_sll_circular_insert_~last~1#1.offset|) (= |ULTIMATE.start_main_~len~0#1| 2) (= 1 |ULTIMATE.start_sll_circular_insert_~data#1|) (<= 2 |ULTIMATE.start_sll_circular_insert_~head#1.base|) (not (= (select |#valid| |ULTIMATE.start_sll_circular_insert_~last~1#1.base|) 1)) (= |ULTIMATE.start_sll_circular_insert_#in~data#1| 1) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_circular_insert_~head#1.base|) 0) |ULTIMATE.start_sll_circular_insert_~last~1#1.offset|) (= |ULTIMATE.start_sll_circular_insert_~last~1#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_circular_insert_~head#1.base|) 0)))' at error location [2023-11-23 21:14:54,661 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:14:54,661 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:14:54,661 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 27 [2023-11-23 21:14:54,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728445757] [2023-11-23 21:14:54,661 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:14:54,662 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-11-23 21:14:54,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:54,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-11-23 21:14:54,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1825, Unknown=2, NotChecked=86, Total=2070 [2023-11-23 21:14:54,665 INFO L87 Difference]: Start difference. First operand 85 states and 94 transitions. Second operand has 28 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 23 states have internal predecessors, (38), 5 states have call successors, (6), 3 states have call predecessors, (6), 5 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2023-11-23 21:14:56,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:56,268 INFO L93 Difference]: Finished difference Result 132 states and 146 transitions. [2023-11-23 21:14:56,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-23 21:14:56,269 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 23 states have internal predecessors, (38), 5 states have call successors, (6), 3 states have call predecessors, (6), 5 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 29 [2023-11-23 21:14:56,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:56,270 INFO L225 Difference]: With dead ends: 132 [2023-11-23 21:14:56,270 INFO L226 Difference]: Without dead ends: 132 [2023-11-23 21:14:56,272 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 803 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=291, Invalid=2903, Unknown=2, NotChecked=110, Total=3306 [2023-11-23 21:14:56,273 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 572 mSDsluCounter, 413 mSDsCounter, 0 mSdLazyCounter, 816 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 572 SdHoareTripleChecker+Valid, 452 SdHoareTripleChecker+Invalid, 989 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 816 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 145 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:56,274 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [572 Valid, 452 Invalid, 989 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 816 Invalid, 0 Unknown, 145 Unchecked, 0.9s Time] [2023-11-23 21:14:56,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2023-11-23 21:14:56,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 87. [2023-11-23 21:14:56,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 52 states have (on average 1.7692307692307692) internal successors, (92), 82 states have internal predecessors, (92), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:14:56,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 98 transitions. [2023-11-23 21:14:56,284 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 98 transitions. Word has length 29 [2023-11-23 21:14:56,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:56,284 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 98 transitions. [2023-11-23 21:14:56,285 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 23 states have internal predecessors, (38), 5 states have call successors, (6), 3 states have call predecessors, (6), 5 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2023-11-23 21:14:56,285 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 98 transitions. [2023-11-23 21:14:56,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-23 21:14:56,286 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:56,286 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:56,309 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:14:56,497 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:56,497 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 49 more)] === [2023-11-23 21:14:56,498 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:56,498 INFO L85 PathProgramCache]: Analyzing trace with hash 1490859482, now seen corresponding path program 1 times [2023-11-23 21:14:56,498 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:56,498 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790541671] [2023-11-23 21:14:56,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:56,498 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:56,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:57,842 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:14:57,842 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:57,842 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790541671] [2023-11-23 21:14:57,842 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [790541671] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:57,843 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [169163428] [2023-11-23 21:14:57,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:57,843 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:57,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:14:57,849 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:14:57,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_000dc6dc-a7dd-485f-9672-80318fdfc81d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:14:58,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:58,177 INFO L262 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 81 conjunts are in the unsatisfiable core [2023-11-23 21:14:58,188 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:14:58,192 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 21:14:58,337 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-23 21:14:58,337 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 13 [2023-11-23 21:14:58,446 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-23 21:14:58,569 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-23 21:14:58,569 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 17 [2023-11-23 21:14:59,050 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (= (store |c_old(#length)| |node_create_~temp~0#1.base| (select |c_#length| |node_create_~temp~0#1.base|)) |c_#length|) (= |c_#memory_$Pointer$.offset| (store |c_old(#memory_$Pointer$.offset)| |node_create_~temp~0#1.base| (select |c_#memory_$Pointer$.offset| |node_create_~temp~0#1.base|))) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| |node_create_~temp~0#1.base| (select |c_#memory_$Pointer$.base| |node_create_~temp~0#1.base|))) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-23 21:14:59,070 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:14:59,071 INFO L378 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 27 treesize of output 20 [2023-11-23 21:14:59,102 INFO L349 Elim1Store]: treesize reduction 20, result has 39.4 percent of original size [2023-11-23 21:14:59,103 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 20 treesize of output 22 [2023-11-23 21:14:59,111 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-23 21:14:59,120 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-11-23 21:14:59,188 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 17 treesize of output 9 [2023-11-23 21:14:59,198 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 2 not checked. [2023-11-23 21:14:59,198 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:14:59,522 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [169163428] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:59,523 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [380932048] [2023-11-23 21:14:59,526 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-23 21:14:59,526 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:14:59,526 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:14:59,527 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:14:59,527 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:15:01,062 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 6 for LOIs [2023-11-23 21:15:01,087 INFO L180 IcfgInterpreter]: Interpretation finished