./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/memsafety-broom/sll-nested-sll.i --full-output --architecture 64bit -------------------------------------------------------------------------------- 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_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/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_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety-broom/sll-nested-sll.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/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 64bit --witnessprinter.graph.data.programhash 89b7500933072598b3ae86cb9a0697a1fc30e47e1dd961db3afeb42e68cfc79e --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:22:02,056 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:22:02,183 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf [2023-11-23 21:22:02,194 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:22:02,194 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:22:02,249 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:22:02,249 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:22:02,250 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:22:02,251 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:22:02,257 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:22:02,257 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:22:02,259 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:22:02,259 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:22:02,261 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:22:02,262 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:22:02,262 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:22:02,262 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:22:02,263 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:22:02,263 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:22:02,264 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:22:02,264 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:22:02,265 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:22:02,266 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-23 21:22:02,266 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-23 21:22:02,267 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:22:02,268 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:22:02,268 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:22:02,269 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-23 21:22:02,269 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-23 21:22:02,270 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-23 21:22:02,271 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:22:02,271 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-23 21:22:02,272 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-23 21:22:02,272 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:22:02,272 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:22:02,273 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:22:02,273 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:22:02,273 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:22:02,273 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:22:02,274 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:22:02,274 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:22:02,278 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:22:02,279 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:22:02,279 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:22:02,280 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:22:02,280 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_07a0b08b-ac69-4ca7-bee5-96c0510794bb/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 89b7500933072598b3ae86cb9a0697a1fc30e47e1dd961db3afeb42e68cfc79e [2023-11-23 21:22:02,542 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:22:02,574 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:22:02,577 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:22:02,579 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:22:02,579 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:22:02,582 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/memsafety-broom/sll-nested-sll.i [2023-11-23 21:22:05,940 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:22:06,295 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:22:06,296 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/sv-benchmarks/c/memsafety-broom/sll-nested-sll.i [2023-11-23 21:22:06,328 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/data/982421e3b/e64a1191e9c64f609693e06c6ef5be3e/FLAG12e8ff905 [2023-11-23 21:22:06,343 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/data/982421e3b/e64a1191e9c64f609693e06c6ef5be3e [2023-11-23 21:22:06,346 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:22:06,348 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:22:06,349 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:22:06,349 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:22:06,355 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:22:06,356 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:22:06" (1/1) ... [2023-11-23 21:22:06,357 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e0e4b45 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:06, skipping insertion in model container [2023-11-23 21:22:06,357 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:22:06" (1/1) ... [2023-11-23 21:22:06,429 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:22:06,602 WARN L635 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2023-11-23 21:22:06,755 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:22:06,765 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:22:06,785 WARN L635 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2023-11-23 21:22:06,810 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:22:06,836 WARN L675 CHandler]: The function __builtin_bswap16 is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:22:06,844 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:22:06,845 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:06 WrapperNode [2023-11-23 21:22:06,845 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:22:06,846 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:22:06,846 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:22:06,846 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:22:06,854 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:06" (1/1) ... [2023-11-23 21:22:06,869 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:06" (1/1) ... [2023-11-23 21:22:06,893 INFO L138 Inliner]: procedures = 123, calls = 34, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 89 [2023-11-23 21:22:06,893 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:22:06,894 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:22:06,894 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:22:06,894 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:22:06,904 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:06" (1/1) ... [2023-11-23 21:22:06,904 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:06" (1/1) ... [2023-11-23 21:22:06,908 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:06" (1/1) ... [2023-11-23 21:22:06,909 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:06" (1/1) ... [2023-11-23 21:22:06,918 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:06" (1/1) ... [2023-11-23 21:22:06,922 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:06" (1/1) ... [2023-11-23 21:22:06,924 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:06" (1/1) ... [2023-11-23 21:22:06,926 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:06" (1/1) ... [2023-11-23 21:22:06,929 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:22:06,930 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:22:06,931 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:22:06,931 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:22:06,932 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:06" (1/1) ... [2023-11-23 21:22:06,938 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:22:06,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:06,966 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:22:07,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:22:07,022 INFO L130 BoogieDeclarations]: Found specification of procedure alloc_and_zero_internal [2023-11-23 21:22:07,023 INFO L138 BoogieDeclarations]: Found implementation of procedure alloc_and_zero_internal [2023-11-23 21:22:07,023 INFO L130 BoogieDeclarations]: Found specification of procedure create_internal [2023-11-23 21:22:07,023 INFO L138 BoogieDeclarations]: Found implementation of procedure create_internal [2023-11-23 21:22:07,023 INFO L130 BoogieDeclarations]: Found specification of procedure alloc_and_zero [2023-11-23 21:22:07,025 INFO L138 BoogieDeclarations]: Found implementation of procedure alloc_and_zero [2023-11-23 21:22:07,026 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 21:22:07,026 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-23 21:22:07,026 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-23 21:22:07,027 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:22:07,027 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:22:07,027 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:22:07,161 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:22:07,163 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:22:07,592 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:22:07,687 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:22:07,688 INFO L309 CfgBuilder]: Removed 6 assume(true) statements. [2023-11-23 21:22:07,690 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:22:07 BoogieIcfgContainer [2023-11-23 21:22:07,690 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:22:07,693 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:22:07,694 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:22:07,697 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:22:07,698 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:22:06" (1/3) ... [2023-11-23 21:22:07,699 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75656e52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:22:07, skipping insertion in model container [2023-11-23 21:22:07,699 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:06" (2/3) ... [2023-11-23 21:22:07,699 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75656e52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:22:07, skipping insertion in model container [2023-11-23 21:22:07,700 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:22:07" (3/3) ... [2023-11-23 21:22:07,701 INFO L112 eAbstractionObserver]: Analyzing ICFG sll-nested-sll.i [2023-11-23 21:22:07,725 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:22:07,725 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 39 error locations. [2023-11-23 21:22:07,780 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:22:07,789 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;@7738ed4d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:22:07,789 INFO L358 AbstractCegarLoop]: Starting to check reachability of 39 error locations. [2023-11-23 21:22:07,794 INFO L276 IsEmpty]: Start isEmpty. Operand has 87 states, 38 states have (on average 2.236842105263158) internal successors, (85), 77 states have internal predecessors, (85), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-23 21:22:07,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-23 21:22:07,803 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:07,804 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-23 21:22:07,804 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-11-23 21:22:07,811 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:07,811 INFO L85 PathProgramCache]: Analyzing trace with hash 6991277, now seen corresponding path program 1 times [2023-11-23 21:22:07,823 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:07,824 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730724585] [2023-11-23 21:22:07,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:07,825 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:07,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:08,139 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 21:22:08,139 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:08,140 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730724585] [2023-11-23 21:22:08,141 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [730724585] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:22:08,141 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:22:08,141 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:22:08,143 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460298771] [2023-11-23 21:22:08,144 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:22:08,149 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:22:08,151 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:08,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:22:08,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:22:08,205 INFO L87 Difference]: Start difference. First operand has 87 states, 38 states have (on average 2.236842105263158) internal successors, (85), 77 states have internal predecessors, (85), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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 21:22:08,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:08,380 INFO L93 Difference]: Finished difference Result 85 states and 93 transitions. [2023-11-23 21:22:08,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:22:08,383 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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 4 [2023-11-23 21:22:08,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:08,393 INFO L225 Difference]: With dead ends: 85 [2023-11-23 21:22:08,393 INFO L226 Difference]: Without dead ends: 84 [2023-11-23 21:22:08,395 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 21:22:08,400 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 4 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:08,401 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 112 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:22:08,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2023-11-23 21:22:08,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2023-11-23 21:22:08,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 38 states have (on average 2.1052631578947367) internal successors, (80), 74 states have internal predecessors, (80), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-23 21:22:08,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 92 transitions. [2023-11-23 21:22:08,462 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 92 transitions. Word has length 4 [2023-11-23 21:22:08,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:08,463 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 92 transitions. [2023-11-23 21:22:08,463 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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 21:22:08,464 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 92 transitions. [2023-11-23 21:22:08,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-23 21:22:08,464 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:08,464 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-23 21:22:08,464 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:22:08,465 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-11-23 21:22:08,466 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:08,466 INFO L85 PathProgramCache]: Analyzing trace with hash 6991278, now seen corresponding path program 1 times [2023-11-23 21:22:08,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:08,467 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [357405732] [2023-11-23 21:22:08,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:08,467 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:08,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:08,577 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 21:22:08,577 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:08,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [357405732] [2023-11-23 21:22:08,578 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [357405732] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:22:08,578 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:22:08,578 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:22:08,578 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883893699] [2023-11-23 21:22:08,579 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:22:08,580 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:22:08,580 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:08,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:22:08,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:22:08,582 INFO L87 Difference]: Start difference. First operand 84 states and 92 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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 21:22:08,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:08,695 INFO L93 Difference]: Finished difference Result 82 states and 90 transitions. [2023-11-23 21:22:08,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:22:08,696 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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 4 [2023-11-23 21:22:08,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:08,697 INFO L225 Difference]: With dead ends: 82 [2023-11-23 21:22:08,697 INFO L226 Difference]: Without dead ends: 82 [2023-11-23 21:22:08,698 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 21:22:08,700 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 2 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:08,700 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 117 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:22:08,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2023-11-23 21:22:08,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2023-11-23 21:22:08,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 38 states have (on average 2.0526315789473686) internal successors, (78), 72 states have internal predecessors, (78), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-23 21:22:08,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 90 transitions. [2023-11-23 21:22:08,724 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 90 transitions. Word has length 4 [2023-11-23 21:22:08,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:08,725 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 90 transitions. [2023-11-23 21:22:08,726 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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 21:22:08,726 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 90 transitions. [2023-11-23 21:22:08,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-23 21:22:08,730 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:08,730 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:08,731 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:22:08,731 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting alloc_and_zero_internalErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-11-23 21:22:08,732 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:08,733 INFO L85 PathProgramCache]: Analyzing trace with hash -939442667, now seen corresponding path program 1 times [2023-11-23 21:22:08,734 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:08,734 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149068741] [2023-11-23 21:22:08,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:08,735 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:08,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:08,880 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 21:22:08,880 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:08,880 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149068741] [2023-11-23 21:22:08,881 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [149068741] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:22:08,881 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:22:08,881 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:22:08,881 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207966535] [2023-11-23 21:22:08,882 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:22:08,882 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:22:08,883 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:08,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:22:08,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:22:08,884 INFO L87 Difference]: Start difference. First operand 82 states and 90 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:22:09,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:09,007 INFO L93 Difference]: Finished difference Result 81 states and 89 transitions. [2023-11-23 21:22:09,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:22:09,008 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2023-11-23 21:22:09,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:09,009 INFO L225 Difference]: With dead ends: 81 [2023-11-23 21:22:09,009 INFO L226 Difference]: Without dead ends: 81 [2023-11-23 21:22:09,010 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 21:22:09,011 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 2 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:09,012 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 110 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:22:09,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-11-23 21:22:09,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2023-11-23 21:22:09,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 38 states have (on average 2.026315789473684) internal successors, (77), 71 states have internal predecessors, (77), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-23 21:22:09,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 89 transitions. [2023-11-23 21:22:09,023 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 89 transitions. Word has length 11 [2023-11-23 21:22:09,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:09,025 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 89 transitions. [2023-11-23 21:22:09,025 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:22:09,025 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 89 transitions. [2023-11-23 21:22:09,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-23 21:22:09,026 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:09,026 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:09,026 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 21:22:09,026 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting alloc_and_zero_internalErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-11-23 21:22:09,027 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:09,027 INFO L85 PathProgramCache]: Analyzing trace with hash -939442666, now seen corresponding path program 1 times [2023-11-23 21:22:09,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:09,028 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1026618617] [2023-11-23 21:22:09,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:09,028 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:09,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:09,225 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 21:22:09,226 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:09,226 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1026618617] [2023-11-23 21:22:09,226 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1026618617] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:22:09,227 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:22:09,227 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:22:09,227 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999292063] [2023-11-23 21:22:09,227 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:22:09,228 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:22:09,228 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:09,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:22:09,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:22:09,229 INFO L87 Difference]: Start difference. First operand 81 states and 89 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:22:09,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:09,326 INFO L93 Difference]: Finished difference Result 80 states and 88 transitions. [2023-11-23 21:22:09,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:22:09,327 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2023-11-23 21:22:09,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:09,333 INFO L225 Difference]: With dead ends: 80 [2023-11-23 21:22:09,334 INFO L226 Difference]: Without dead ends: 80 [2023-11-23 21:22:09,335 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 21:22:09,345 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 1 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:09,346 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 115 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:22:09,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-11-23 21:22:09,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2023-11-23 21:22:09,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 38 states have (on average 2.0) internal successors, (76), 70 states have internal predecessors, (76), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-23 21:22:09,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 88 transitions. [2023-11-23 21:22:09,367 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 88 transitions. Word has length 11 [2023-11-23 21:22:09,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:09,368 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 88 transitions. [2023-11-23 21:22:09,368 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:22:09,369 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 88 transitions. [2023-11-23 21:22:09,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-23 21:22:09,370 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:09,370 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:09,370 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 21:22:09,370 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-11-23 21:22:09,371 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:09,371 INFO L85 PathProgramCache]: Analyzing trace with hash 1093149562, now seen corresponding path program 1 times [2023-11-23 21:22:09,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:09,373 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793865005] [2023-11-23 21:22:09,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:09,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:09,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:09,932 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 21:22:09,932 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:09,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793865005] [2023-11-23 21:22:09,933 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [793865005] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:22:09,933 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:22:09,933 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-23 21:22:09,934 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036240146] [2023-11-23 21:22:09,934 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:22:09,934 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 21:22:09,935 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:09,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 21:22:09,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2023-11-23 21:22:09,936 INFO L87 Difference]: Start difference. First operand 80 states and 88 transitions. Second operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:22:10,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:10,488 INFO L93 Difference]: Finished difference Result 97 states and 110 transitions. [2023-11-23 21:22:10,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 21:22:10,489 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 18 [2023-11-23 21:22:10,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:10,492 INFO L225 Difference]: With dead ends: 97 [2023-11-23 21:22:10,493 INFO L226 Difference]: Without dead ends: 97 [2023-11-23 21:22:10,493 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2023-11-23 21:22:10,501 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 18 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 386 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:10,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 222 Invalid, 386 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 358 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 21:22:10,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2023-11-23 21:22:10,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 90. [2023-11-23 21:22:10,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 47 states have (on average 1.9361702127659575) internal successors, (91), 77 states have internal predecessors, (91), 7 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) [2023-11-23 21:22:10,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 107 transitions. [2023-11-23 21:22:10,523 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 107 transitions. Word has length 18 [2023-11-23 21:22:10,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:10,523 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 107 transitions. [2023-11-23 21:22:10,524 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:22:10,524 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 107 transitions. [2023-11-23 21:22:10,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-23 21:22:10,525 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:10,525 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:10,525 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-23 21:22:10,525 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-11-23 21:22:10,526 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:10,530 INFO L85 PathProgramCache]: Analyzing trace with hash 1093149563, now seen corresponding path program 1 times [2023-11-23 21:22:10,531 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:10,532 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [519395670] [2023-11-23 21:22:10,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:10,532 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:10,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:11,124 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 21:22:11,125 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:11,125 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [519395670] [2023-11-23 21:22:11,125 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [519395670] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:22:11,125 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:22:11,125 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2023-11-23 21:22:11,126 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211810330] [2023-11-23 21:22:11,126 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:22:11,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 21:22:11,127 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:11,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 21:22:11,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2023-11-23 21:22:11,128 INFO L87 Difference]: Start difference. First operand 90 states and 107 transitions. Second operand has 11 states, 8 states have (on average 1.5) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:22:11,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:11,771 INFO L93 Difference]: Finished difference Result 102 states and 123 transitions. [2023-11-23 21:22:11,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-23 21:22:11,772 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 1.5) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 18 [2023-11-23 21:22:11,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:11,773 INFO L225 Difference]: With dead ends: 102 [2023-11-23 21:22:11,774 INFO L226 Difference]: Without dead ends: 102 [2023-11-23 21:22:11,774 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2023-11-23 21:22:11,775 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 18 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 484 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 500 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 484 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:11,776 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 276 Invalid, 500 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 484 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:22:11,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2023-11-23 21:22:11,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 98. [2023-11-23 21:22:11,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 53 states have (on average 1.8679245283018868) internal successors, (99), 83 states have internal predecessors, (99), 9 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (12), 11 states have call predecessors, (12), 9 states have call successors, (12) [2023-11-23 21:22:11,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 120 transitions. [2023-11-23 21:22:11,787 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 120 transitions. Word has length 18 [2023-11-23 21:22:11,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:11,787 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 120 transitions. [2023-11-23 21:22:11,788 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 1.5) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:22:11,788 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 120 transitions. [2023-11-23 21:22:11,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-23 21:22:11,789 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:11,789 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:11,789 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-23 21:22:11,790 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting create_internalErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-11-23 21:22:11,790 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:11,790 INFO L85 PathProgramCache]: Analyzing trace with hash -1711403091, now seen corresponding path program 1 times [2023-11-23 21:22:11,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:11,791 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [81742322] [2023-11-23 21:22:11,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:11,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:11,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:11,987 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:22:11,988 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:11,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [81742322] [2023-11-23 21:22:11,988 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [81742322] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:22:11,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [957125954] [2023-11-23 21:22:11,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:11,989 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:11,989 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:11,994 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:22:12,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:22:12,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:12,117 INFO L262 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-23 21:22:12,124 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:22:12,192 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 21:22:12,236 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int)) (= |c_#valid| (store |c_old(#valid)| alloc_and_zero_internal_~pi~1.base 1))) is different from true [2023-11-23 21:22:12,269 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-23 21:22:12,270 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2023-11-23 21:22:12,284 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2023-11-23 21:22:12,284 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:22:12,501 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:22:12,502 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [957125954] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:22:12,502 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1314375885] [2023-11-23 21:22:12,527 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-23 21:22:12,527 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:22:12,533 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:22:12,540 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:22:12,540 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:22:12,811 INFO L197 IcfgInterpreter]: Interpreting procedure create_internal with input of size 50 for LOIs [2023-11-23 21:22:13,410 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 92 for LOIs [2023-11-23 21:22:13,565 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-11-23 21:22:13,590 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:22:17,401 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1300#(and (= create_internal_~sll~0.offset 0) (<= 1 |#StackHeapBarrier|) (= create_internal_~now~0.offset 0) (or (and (<= (+ create_internal_~sll~0.base 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.base_100| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_100| |create_internal_#t~ret7.base| (store (select |v_#memory_$Pointer$.base_100| |create_internal_#t~ret7.base|) 0 0)) |#memory_$Pointer$.base|)) (exists ((|v_#valid_115| (Array Int Int))) (= (select |v_#valid_115| create_internal_~sll~0.base) 0)) (exists ((|v_#memory_$Pointer$.base_98| (Array Int (Array Int Int))) (|v_#valid_114| (Array Int Int)) (|v_#memory_$Pointer$.offset_98| (Array Int (Array Int Int))) (|v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| Int) (|v_#length_94| (Array Int Int))) (and (= |old(#valid)| (store |v_#valid_114| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| 1)) (= |old(#memory_$Pointer$.offset)| (store |v_#memory_$Pointer$.offset_98| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| (store (store (select |v_#memory_$Pointer$.offset_98| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1|) 0 0) 8 0))) (= (select |v_#valid_114| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1|) 0) (= (store |v_#length_94| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| 16) |old(#length)|) (<= (+ |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| 1) |#StackHeapBarrier|) (= |old(#memory_$Pointer$.base)| (store |v_#memory_$Pointer$.base_98| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| (store (store (select |v_#memory_$Pointer$.base_98| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1|) 0 0) 8 0))) (not (= |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| 0)))) (exists ((|v_#valid_117| (Array Int Int))) (and (= (select |v_#valid_117| |create_internal_#t~ret7.base|) 0) (= (store |v_#valid_117| |create_internal_#t~ret7.base| 1) |#valid|))) (exists ((|v_ULTIMATE.start_main_old_#valid#1_BEFORE_CALL_3| (Array Int Int))) (= (select |v_ULTIMATE.start_main_old_#valid#1_BEFORE_CALL_3| 0) 0)) (exists ((|v_#length_95| (Array Int Int))) (= |#length| (store |v_#length_95| |create_internal_#t~ret7.base| 8))) (not (= |create_internal_#t~ret7.base| 0)) (exists ((|v_create_internal_#t~nondet6_7| Int)) (and (not (= |v_create_internal_#t~nondet6_7| 0)) (<= 0 (+ |v_create_internal_#t~nondet6_7| 2147483648)) (<= |v_create_internal_#t~nondet6_7| 2147483647))) (exists ((|v_#memory_$Pointer$.offset_100| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_100| |create_internal_#t~ret7.base| (store (select |v_#memory_$Pointer$.offset_100| |create_internal_#t~ret7.base|) 0 0)))) (not (= create_internal_~sll~0.base 0)) (= create_internal_~now~0.base create_internal_~sll~0.base) (<= (+ |create_internal_#t~ret7.base| 1) |#StackHeapBarrier|)) (and (<= (+ create_internal_~sll~0.base 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.base_100| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_100| |create_internal_#t~ret7.base| (store (select |v_#memory_$Pointer$.base_100| |create_internal_#t~ret7.base|) 0 0)) |#memory_$Pointer$.base|)) (exists ((|v_#valid_115| (Array Int Int))) (= (select |v_#valid_115| create_internal_~sll~0.base) 0)) (exists ((|v_#memory_$Pointer$.base_98| (Array Int (Array Int Int))) (|v_#valid_114| (Array Int Int)) (|v_#memory_$Pointer$.offset_98| (Array Int (Array Int Int))) (|v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| Int) (|v_#length_94| (Array Int Int))) (and (= |old(#valid)| (store |v_#valid_114| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| 1)) (= |old(#memory_$Pointer$.offset)| (store |v_#memory_$Pointer$.offset_98| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| (store (store (select |v_#memory_$Pointer$.offset_98| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1|) 0 0) 8 0))) (= (select |v_#valid_114| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1|) 0) (= (store |v_#length_94| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| 16) |old(#length)|) (<= (+ |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| 1) |#StackHeapBarrier|) (= |old(#memory_$Pointer$.base)| (store |v_#memory_$Pointer$.base_98| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| (store (store (select |v_#memory_$Pointer$.base_98| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1|) 0 0) 8 0))) (not (= |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| 0)))) (exists ((|v_#valid_116| (Array Int Int))) (and (= (store |v_#valid_116| |create_internal_#t~ret7.base| 1) |#valid|) (= (select |v_#valid_116| |create_internal_#t~ret7.base|) 0))) (exists ((|v_ULTIMATE.start_main_old_#valid#1_BEFORE_CALL_3| (Array Int Int))) (= (select |v_ULTIMATE.start_main_old_#valid#1_BEFORE_CALL_3| 0) 0)) (exists ((|v_#length_95| (Array Int Int))) (= |#length| (store |v_#length_95| |create_internal_#t~ret7.base| 8))) (not (= |create_internal_#t~ret7.base| 0)) (exists ((|v_create_internal_#t~nondet6_7| Int)) (and (not (= |v_create_internal_#t~nondet6_7| 0)) (<= 0 (+ |v_create_internal_#t~nondet6_7| 2147483648)) (<= |v_create_internal_#t~nondet6_7| 2147483647))) (exists ((|v_#memory_$Pointer$.offset_101| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.offset_101| |create_internal_#t~ret7.base| (store (select |v_#memory_$Pointer$.offset_101| |create_internal_#t~ret7.base|) 0 0)) |#memory_$Pointer$.offset|)) (not (= create_internal_~sll~0.base 0)) (= create_internal_~now~0.base create_internal_~sll~0.base) (<= (+ |create_internal_#t~ret7.base| 1) |#StackHeapBarrier|))) (not (= (select |#valid| create_internal_~now~0.base) 1)) (= |create_internal_#t~ret7.offset| 0))' at error location [2023-11-23 21:22:17,401 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:22:17,401 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:22:17,402 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 6] total 10 [2023-11-23 21:22:17,402 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638774949] [2023-11-23 21:22:17,402 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:22:17,403 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 21:22:17,403 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:17,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 21:22:17,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=565, Unknown=1, NotChecked=48, Total=702 [2023-11-23 21:22:17,406 INFO L87 Difference]: Start difference. First operand 98 states and 120 transitions. Second operand has 11 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 21:22:18,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:18,072 INFO L93 Difference]: Finished difference Result 100 states and 123 transitions. [2023-11-23 21:22:18,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-23 21:22:18,074 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 20 [2023-11-23 21:22:18,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:18,076 INFO L225 Difference]: With dead ends: 100 [2023-11-23 21:22:18,076 INFO L226 Difference]: Without dead ends: 100 [2023-11-23 21:22:18,077 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 37 SyntacticMatches, 4 SemanticMatches, 30 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=120, Invalid=813, Unknown=1, NotChecked=58, Total=992 [2023-11-23 21:22:18,079 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 25 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 360 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 360 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 94 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:18,080 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 279 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 360 Invalid, 0 Unknown, 94 Unchecked, 0.4s Time] [2023-11-23 21:22:18,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-11-23 21:22:18,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2023-11-23 21:22:18,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 54 states have (on average 1.8518518518518519) internal successors, (100), 83 states have internal predecessors, (100), 10 states have call successors, (10), 3 states have call predecessors, (10), 4 states have return successors, (13), 12 states have call predecessors, (13), 10 states have call successors, (13) [2023-11-23 21:22:18,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 123 transitions. [2023-11-23 21:22:18,102 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 123 transitions. Word has length 20 [2023-11-23 21:22:18,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:18,103 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 123 transitions. [2023-11-23 21:22:18,103 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 21:22:18,103 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 123 transitions. [2023-11-23 21:22:18,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-23 21:22:18,105 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:18,105 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:18,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:22:18,329 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:18,329 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting create_internalErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-11-23 21:22:18,330 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:18,330 INFO L85 PathProgramCache]: Analyzing trace with hash -1711403090, now seen corresponding path program 1 times [2023-11-23 21:22:18,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:18,330 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [693223338] [2023-11-23 21:22:18,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:18,330 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:18,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:18,809 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:22:18,809 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:18,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [693223338] [2023-11-23 21:22:18,812 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [693223338] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:22:18,813 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033346644] [2023-11-23 21:22:18,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:18,813 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:18,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:18,815 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:22:18,822 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:22:18,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:18,938 INFO L262 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-23 21:22:18,945 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:22:18,952 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 21:22:19,031 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int)) (= (store |c_old(#length)| alloc_and_zero_internal_~pi~1.base 8) |c_#length|)) is different from true [2023-11-23 21:22:19,049 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-23 21:22:19,050 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2023-11-23 21:22:19,072 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2023-11-23 21:22:19,073 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:22:19,170 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033346644] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:22:19,170 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1955052106] [2023-11-23 21:22:19,173 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-23 21:22:19,173 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:22:19,174 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:22:19,174 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:22:19,174 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:22:19,254 INFO L197 IcfgInterpreter]: Interpreting procedure create_internal with input of size 54 for LOIs [2023-11-23 21:22:19,648 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 92 for LOIs [2023-11-23 21:22:19,735 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-11-23 21:22:19,752 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:22:24,098 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1604#(and (= create_internal_~sll~0.offset 0) (<= 1 |#StackHeapBarrier|) (= create_internal_~now~0.offset 0) (<= (select |#length| create_internal_~now~0.base) 7) (= |create_internal_#t~ret7.offset| 0) (or (and (<= (+ create_internal_~sll~0.base 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.offset_112| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_112| |create_internal_#t~ret7.base| (store (select |v_#memory_$Pointer$.offset_112| |create_internal_#t~ret7.base|) 0 0)))) (exists ((|v_create_internal_#t~nondet6_8| Int)) (and (not (= |v_create_internal_#t~nondet6_8| 0)) (<= 0 (+ |v_create_internal_#t~nondet6_8| 2147483648)) (<= |v_create_internal_#t~nondet6_8| 2147483647))) (exists ((|v_#valid_124| (Array Int Int)) (|v_#length_108| (Array Int Int)) (|v_#memory_$Pointer$.offset_110| (Array Int (Array Int Int))) (|v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| Int) (|v_#memory_$Pointer$.base_110| (Array Int (Array Int Int)))) (and (not (= |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| 0)) (= (select |v_#valid_124| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2|) 0) (= |old(#valid)| (store |v_#valid_124| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| 1)) (= (store |v_#memory_$Pointer$.base_110| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| (store (store (select |v_#memory_$Pointer$.base_110| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2|) 0 0) 8 0)) |old(#memory_$Pointer$.base)|) (= |old(#length)| (store |v_#length_108| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| 16)) (= |old(#memory_$Pointer$.offset)| (store |v_#memory_$Pointer$.offset_110| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| (store (store (select |v_#memory_$Pointer$.offset_110| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2|) 0 0) 8 0))) (<= (+ |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| 1) |#StackHeapBarrier|))) (exists ((|v_#memory_$Pointer$.base_112| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_112| |create_internal_#t~ret7.base| (store (select |v_#memory_$Pointer$.base_112| |create_internal_#t~ret7.base|) 0 0)))) (not (= |create_internal_#t~ret7.base| 0)) (exists ((|v_#valid_127| (Array Int Int))) (and (= (store |v_#valid_127| |create_internal_#t~ret7.base| 1) |#valid|) (= (select |v_#valid_127| |create_internal_#t~ret7.base|) 0))) (exists ((|v_ULTIMATE.start_main_old_#valid#1_BEFORE_CALL_7| (Array Int Int))) (= (select |v_ULTIMATE.start_main_old_#valid#1_BEFORE_CALL_7| 0) 0)) (exists ((|v_#valid_125| (Array Int Int))) (= (select |v_#valid_125| create_internal_~sll~0.base) 0)) (not (= create_internal_~sll~0.base 0)) (= create_internal_~now~0.base create_internal_~sll~0.base) (<= (+ |create_internal_#t~ret7.base| 1) |#StackHeapBarrier|) (exists ((|v_#length_111| (Array Int Int))) (= (store |v_#length_111| |create_internal_#t~ret7.base| 8) |#length|))) (and (<= (+ create_internal_~sll~0.base 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.base_113| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_113| |create_internal_#t~ret7.base| (store (select |v_#memory_$Pointer$.base_113| |create_internal_#t~ret7.base|) 0 0)) |#memory_$Pointer$.base|)) (exists ((|v_#memory_$Pointer$.offset_112| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_112| |create_internal_#t~ret7.base| (store (select |v_#memory_$Pointer$.offset_112| |create_internal_#t~ret7.base|) 0 0)))) (exists ((|v_create_internal_#t~nondet6_8| Int)) (and (not (= |v_create_internal_#t~nondet6_8| 0)) (<= 0 (+ |v_create_internal_#t~nondet6_8| 2147483648)) (<= |v_create_internal_#t~nondet6_8| 2147483647))) (exists ((|v_#valid_124| (Array Int Int)) (|v_#length_108| (Array Int Int)) (|v_#memory_$Pointer$.offset_110| (Array Int (Array Int Int))) (|v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| Int) (|v_#memory_$Pointer$.base_110| (Array Int (Array Int Int)))) (and (not (= |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| 0)) (= (select |v_#valid_124| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2|) 0) (= |old(#valid)| (store |v_#valid_124| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| 1)) (= (store |v_#memory_$Pointer$.base_110| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| (store (store (select |v_#memory_$Pointer$.base_110| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2|) 0 0) 8 0)) |old(#memory_$Pointer$.base)|) (= |old(#length)| (store |v_#length_108| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| 16)) (= |old(#memory_$Pointer$.offset)| (store |v_#memory_$Pointer$.offset_110| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| (store (store (select |v_#memory_$Pointer$.offset_110| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2|) 0 0) 8 0))) (<= (+ |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| 1) |#StackHeapBarrier|))) (exists ((|v_#length_110| (Array Int Int))) (= |#length| (store |v_#length_110| |create_internal_#t~ret7.base| 8))) (not (= |create_internal_#t~ret7.base| 0)) (exists ((|v_ULTIMATE.start_main_old_#valid#1_BEFORE_CALL_7| (Array Int Int))) (= (select |v_ULTIMATE.start_main_old_#valid#1_BEFORE_CALL_7| 0) 0)) (exists ((|v_#valid_126| (Array Int Int))) (= 0 (select |v_#valid_126| create_internal_~sll~0.base))) (not (= create_internal_~sll~0.base 0)) (= create_internal_~now~0.base create_internal_~sll~0.base) (<= (+ |create_internal_#t~ret7.base| 1) |#StackHeapBarrier|) (exists ((|v_#valid_125| (Array Int Int))) (and (= (store |v_#valid_125| |create_internal_#t~ret7.base| 1) |#valid|) (= (select |v_#valid_125| |create_internal_#t~ret7.base|) 0))))))' at error location [2023-11-23 21:22:24,098 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:22:24,099 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:22:24,099 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 13 [2023-11-23 21:22:24,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672242771] [2023-11-23 21:22:24,099 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:22:24,100 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-23 21:22:24,100 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:24,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-23 21:22:24,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=827, Unknown=1, NotChecked=58, Total=992 [2023-11-23 21:22:24,101 INFO L87 Difference]: Start difference. First operand 99 states and 123 transitions. Second operand has 14 states, 10 states have (on average 1.9) internal successors, (19), 10 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-23 21:22:24,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:24,576 INFO L93 Difference]: Finished difference Result 100 states and 123 transitions. [2023-11-23 21:22:24,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-23 21:22:24,577 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 10 states have (on average 1.9) internal successors, (19), 10 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 20 [2023-11-23 21:22:24,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:24,578 INFO L225 Difference]: With dead ends: 100 [2023-11-23 21:22:24,578 INFO L226 Difference]: Without dead ends: 100 [2023-11-23 21:22:24,579 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=134, Invalid=1059, Unknown=1, NotChecked=66, Total=1260 [2023-11-23 21:22:24,580 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 14 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 270 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 386 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 270 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 94 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:24,584 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 255 Invalid, 386 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 270 Invalid, 0 Unknown, 94 Unchecked, 0.3s Time] [2023-11-23 21:22:24,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-11-23 21:22:24,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2023-11-23 21:22:24,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 55 states have (on average 1.8181818181818181) internal successors, (100), 84 states have internal predecessors, (100), 10 states have call successors, (10), 3 states have call predecessors, (10), 4 states have return successors, (13), 12 states have call predecessors, (13), 10 states have call successors, (13) [2023-11-23 21:22:24,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 123 transitions. [2023-11-23 21:22:24,591 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 123 transitions. Word has length 20 [2023-11-23 21:22:24,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:24,591 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 123 transitions. [2023-11-23 21:22:24,591 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 10 states have (on average 1.9) internal successors, (19), 10 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-23 21:22:24,592 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 123 transitions. [2023-11-23 21:22:24,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-23 21:22:24,593 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:24,593 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:24,613 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:22:24,806 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:24,807 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-11-23 21:22:24,807 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:24,807 INFO L85 PathProgramCache]: Analyzing trace with hash -222925609, now seen corresponding path program 1 times [2023-11-23 21:22:24,807 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:24,808 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [749248572] [2023-11-23 21:22:24,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:24,808 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:24,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:24,890 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 21:22:24,891 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:24,891 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [749248572] [2023-11-23 21:22:24,891 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [749248572] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:22:24,891 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:22:24,891 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 21:22:24,892 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077780250] [2023-11-23 21:22:24,892 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:22:24,892 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:22:24,892 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:24,893 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:22:24,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:22:24,893 INFO L87 Difference]: Start difference. First operand 100 states and 123 transitions. Second operand has 5 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 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 21:22:25,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:25,043 INFO L93 Difference]: Finished difference Result 119 states and 149 transitions. [2023-11-23 21:22:25,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:22:25,044 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 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 23 [2023-11-23 21:22:25,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:25,045 INFO L225 Difference]: With dead ends: 119 [2023-11-23 21:22:25,046 INFO L226 Difference]: Without dead ends: 119 [2023-11-23 21:22:25,046 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:22:25,047 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 27 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:25,047 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 169 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 158 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:22:25,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2023-11-23 21:22:25,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 110. [2023-11-23 21:22:25,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 65 states have (on average 1.8461538461538463) internal successors, (120), 92 states have internal predecessors, (120), 11 states have call successors, (11), 3 states have call predecessors, (11), 4 states have return successors, (15), 14 states have call predecessors, (15), 11 states have call successors, (15) [2023-11-23 21:22:25,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 146 transitions. [2023-11-23 21:22:25,055 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 146 transitions. Word has length 23 [2023-11-23 21:22:25,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:25,055 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 146 transitions. [2023-11-23 21:22:25,055 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 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 21:22:25,056 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 146 transitions. [2023-11-23 21:22:25,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-23 21:22:25,056 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:25,057 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:25,057 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-23 21:22:25,057 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-11-23 21:22:25,057 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:25,057 INFO L85 PathProgramCache]: Analyzing trace with hash -222925608, now seen corresponding path program 1 times [2023-11-23 21:22:25,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:25,058 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1150104495] [2023-11-23 21:22:25,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:25,058 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:25,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:25,261 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 21:22:25,261 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:25,262 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1150104495] [2023-11-23 21:22:25,262 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1150104495] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:22:25,262 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:22:25,262 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-23 21:22:25,262 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931659002] [2023-11-23 21:22:25,262 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:22:25,263 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-23 21:22:25,263 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:25,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-23 21:22:25,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-23 21:22:25,264 INFO L87 Difference]: Start difference. First operand 110 states and 146 transitions. Second operand has 8 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 21:22:25,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:25,482 INFO L93 Difference]: Finished difference Result 124 states and 156 transitions. [2023-11-23 21:22:25,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 21:22:25,483 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2023-11-23 21:22:25,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:25,485 INFO L225 Difference]: With dead ends: 124 [2023-11-23 21:22:25,485 INFO L226 Difference]: Without dead ends: 124 [2023-11-23 21:22:25,486 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2023-11-23 21:22:25,486 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 23 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 243 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 341 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:25,486 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 341 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 243 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:22:25,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2023-11-23 21:22:25,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 116. [2023-11-23 21:22:25,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 71 states have (on average 1.8309859154929577) internal successors, (130), 98 states have internal predecessors, (130), 11 states have call successors, (11), 3 states have call predecessors, (11), 4 states have return successors, (15), 14 states have call predecessors, (15), 11 states have call successors, (15) [2023-11-23 21:22:25,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 156 transitions. [2023-11-23 21:22:25,493 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 156 transitions. Word has length 23 [2023-11-23 21:22:25,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:25,493 INFO L495 AbstractCegarLoop]: Abstraction has 116 states and 156 transitions. [2023-11-23 21:22:25,494 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 21:22:25,494 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 156 transitions. [2023-11-23 21:22:25,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-23 21:22:25,504 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:25,504 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:25,504 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-11-23 21:22:25,504 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-11-23 21:22:25,505 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:25,505 INFO L85 PathProgramCache]: Analyzing trace with hash 1679385118, now seen corresponding path program 1 times [2023-11-23 21:22:25,505 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:25,506 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217445349] [2023-11-23 21:22:25,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:25,506 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:25,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:25,588 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 21:22:25,588 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:25,588 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [217445349] [2023-11-23 21:22:25,588 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [217445349] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:22:25,588 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:22:25,589 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-23 21:22:25,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450268448] [2023-11-23 21:22:25,589 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:22:25,589 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:22:25,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:25,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:22:25,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:22:25,590 INFO L87 Difference]: Start difference. First operand 116 states and 156 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 21:22:25,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:25,727 INFO L93 Difference]: Finished difference Result 126 states and 165 transitions. [2023-11-23 21:22:25,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 21:22:25,727 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2023-11-23 21:22:25,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:25,728 INFO L225 Difference]: With dead ends: 126 [2023-11-23 21:22:25,729 INFO L226 Difference]: Without dead ends: 126 [2023-11-23 21:22:25,729 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-23 21:22:25,729 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 25 mSDsluCounter, 284 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:25,730 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 345 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:22:25,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2023-11-23 21:22:25,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 117. [2023-11-23 21:22:25,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 72 states have (on average 1.7916666666666667) internal successors, (129), 99 states have internal predecessors, (129), 11 states have call successors, (11), 3 states have call predecessors, (11), 4 states have return successors, (15), 14 states have call predecessors, (15), 11 states have call successors, (15) [2023-11-23 21:22:25,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 155 transitions. [2023-11-23 21:22:25,736 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 155 transitions. Word has length 24 [2023-11-23 21:22:25,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:25,737 INFO L495 AbstractCegarLoop]: Abstraction has 117 states and 155 transitions. [2023-11-23 21:22:25,737 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 21:22:25,737 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 155 transitions. [2023-11-23 21:22:25,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-23 21:22:25,738 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:25,738 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:25,738 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-23 21:22:25,738 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-11-23 21:22:25,739 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:25,739 INFO L85 PathProgramCache]: Analyzing trace with hash -126915569, now seen corresponding path program 1 times [2023-11-23 21:22:25,739 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:25,739 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [495654723] [2023-11-23 21:22:25,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:25,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:25,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:26,270 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 21:22:26,270 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:26,270 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [495654723] [2023-11-23 21:22:26,270 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [495654723] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:22:26,270 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [205996074] [2023-11-23 21:22:26,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:26,271 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:26,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:26,272 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:22:26,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:22:26,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:26,390 INFO L262 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 24 conjunts are in the unsatisfiable core [2023-11-23 21:22:26,394 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:22:26,403 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 21:22:26,422 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int)) (and (= |c_#valid| (store |c_old(#valid)| alloc_and_zero_internal_~pi~1.base (select |c_#valid| alloc_and_zero_internal_~pi~1.base))) (= (select |c_old(#valid)| alloc_and_zero_internal_~pi~1.base) 0))) is different from true [2023-11-23 21:22:26,451 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int)) (= |c_#valid| (store |c_old(#valid)| alloc_and_zero_internal_~pi~1.base 1))) is different from true [2023-11-23 21:22:26,658 INFO L349 Elim1Store]: treesize reduction 104, result has 34.2 percent of original size [2023-11-23 21:22:26,658 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 9 case distinctions, treesize of input 40 treesize of output 104 [2023-11-23 21:22:26,933 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:22:26,942 INFO L349 Elim1Store]: treesize reduction 25, result has 16.7 percent of original size [2023-11-23 21:22:26,942 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 12 [2023-11-23 21:22:26,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:22:27,016 INFO L349 Elim1Store]: treesize reduction 425, result has 0.2 percent of original size [2023-11-23 21:22:27,017 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 3 stores, 5 select indices, 5 select index equivalence classes, 2 disjoint index pairs (out of 10 index pairs), introduced 8 new quantified variables, introduced 19 case distinctions, treesize of input 75 treesize of output 1 [2023-11-23 21:22:27,246 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 4 not checked. [2023-11-23 21:22:27,246 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:22:27,358 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [205996074] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:22:27,359 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1963094900] [2023-11-23 21:22:27,361 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-11-23 21:22:27,361 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:22:27,362 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:22:27,362 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:22:27,362 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:22:28,507 INFO L197 IcfgInterpreter]: Interpreting procedure create_internal with input of size 54 for LOIs [2023-11-23 21:22:29,741 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 53 for LOIs [2023-11-23 21:22:29,775 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-11-23 21:22:29,789 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:22:35,881 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2667#(and (not (= (select |#valid| |ULTIMATE.start_create_~now~1#1.base|) 1)) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_create_#t~ret10#1.offset| 0) (or (and (exists ((v_create_internal_~now~0.offset_21 Int) (|v_#valid_151| (Array Int Int)) (|v_#length_126| (Array Int Int)) (v_create_internal_~now~0.base_23 Int) (|v_#memory_$Pointer$.offset_132| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_132| (Array Int (Array Int Int)))) (and (= |#memory_$Pointer$.offset| (store (store |v_#memory_$Pointer$.offset_132| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21) (store (select |v_#memory_$Pointer$.offset_132| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21)) 0 0)) v_create_internal_~now~0.base_23 (store (select (store |v_#memory_$Pointer$.offset_132| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21) (store (select |v_#memory_$Pointer$.offset_132| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21)) 0 0)) v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21 0))) (= |#memory_$Pointer$.base| (store (store |v_#memory_$Pointer$.base_132| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21) (store (select |v_#memory_$Pointer$.base_132| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21)) 0 0)) v_create_internal_~now~0.base_23 (store (select (store |v_#memory_$Pointer$.base_132| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21) (store (select |v_#memory_$Pointer$.base_132| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21)) 0 0)) v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21 (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21)))) (<= (+ v_create_internal_~now~0.offset_21 8) (select |#length| v_create_internal_~now~0.base_23)) (<= (+ (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21) 1) |#StackHeapBarrier|) (<= 0 v_create_internal_~now~0.offset_21) (= (select |v_#valid_151| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21)) 0) (= (store |v_#valid_151| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21) 1) |#valid|) (not (= (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21) 0)) (= |#length| (store |v_#length_126| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21) 8)) (= (select |#valid| v_create_internal_~now~0.base_23) 1))) (exists ((|v_#valid_150| (Array Int Int))) (= (select |v_#valid_150| |ULTIMATE.start_create_~sll~1#1.base|) 0)) (<= (+ |ULTIMATE.start_create_~sll~1#1.base| 1) |#StackHeapBarrier|) (not (= |ULTIMATE.start_create_~sll~1#1.base| 0)) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (= |ULTIMATE.start_create_~now~1#1.base| |ULTIMATE.start_create_~sll~1#1.base|)) (and (exists ((|v_#valid_150| (Array Int Int))) (= (select |v_#valid_150| |ULTIMATE.start_create_~sll~1#1.base|) 0)) (<= (+ |ULTIMATE.start_create_~sll~1#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.offset_132| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_132| |ULTIMATE.start_create_#t~ret10#1.base| (store (select |v_#memory_$Pointer$.offset_132| |ULTIMATE.start_create_#t~ret10#1.base|) 0 0)))) (not (= |ULTIMATE.start_create_~sll~1#1.base| 0)) (not (= |ULTIMATE.start_create_#t~ret10#1.base| 0)) (exists ((|v_#valid_151| (Array Int Int))) (and (= (select |v_#valid_151| |ULTIMATE.start_create_#t~ret10#1.base|) 0) (= |#valid| (store |v_#valid_151| |ULTIMATE.start_create_#t~ret10#1.base| 1)))) (exists ((|v_#memory_$Pointer$.base_132| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_132| |ULTIMATE.start_create_#t~ret10#1.base| (store (select |v_#memory_$Pointer$.base_132| |ULTIMATE.start_create_#t~ret10#1.base|) 0 0)))) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (exists ((|v_#length_126| (Array Int Int))) (= (store |v_#length_126| |ULTIMATE.start_create_#t~ret10#1.base| 8) |#length|)) (<= (+ |ULTIMATE.start_create_#t~ret10#1.base| 1) |#StackHeapBarrier|) (= |ULTIMATE.start_create_~now~1#1.base| |ULTIMATE.start_create_~sll~1#1.base|))) (= |ULTIMATE.start_create_~now~1#1.offset| 0) (= |ULTIMATE.start_create_~sll~1#1.offset| 0))' at error location [2023-11-23 21:22:35,882 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:22:35,882 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:22:35,882 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 16 [2023-11-23 21:22:35,882 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259488720] [2023-11-23 21:22:35,882 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:22:35,883 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-23 21:22:35,883 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:35,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-23 21:22:35,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1116, Unknown=4, NotChecked=138, Total=1406 [2023-11-23 21:22:35,885 INFO L87 Difference]: Start difference. First operand 117 states and 155 transitions. Second operand has 17 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 5 states have call successors, (5), 2 states have call predecessors, (5), 7 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2023-11-23 21:22:37,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:37,498 INFO L93 Difference]: Finished difference Result 132 states and 177 transitions. [2023-11-23 21:22:37,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-23 21:22:37,498 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 5 states have call successors, (5), 2 states have call predecessors, (5), 7 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) Word has length 26 [2023-11-23 21:22:37,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:37,500 INFO L225 Difference]: With dead ends: 132 [2023-11-23 21:22:37,500 INFO L226 Difference]: Without dead ends: 132 [2023-11-23 21:22:37,501 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 493 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=226, Invalid=1670, Unknown=4, NotChecked=170, Total=2070 [2023-11-23 21:22:37,502 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 38 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 518 mSolverCounterSat, 61 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 300 SdHoareTripleChecker+Invalid, 808 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 518 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 228 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:37,502 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 300 Invalid, 808 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 518 Invalid, 1 Unknown, 228 Unchecked, 0.8s Time] [2023-11-23 21:22:37,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2023-11-23 21:22:37,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 122. [2023-11-23 21:22:37,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 76 states have (on average 1.7763157894736843) internal successors, (135), 103 states have internal predecessors, (135), 11 states have call successors, (11), 3 states have call predecessors, (11), 5 states have return successors, (19), 15 states have call predecessors, (19), 11 states have call successors, (19) [2023-11-23 21:22:37,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 165 transitions. [2023-11-23 21:22:37,533 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 165 transitions. Word has length 26 [2023-11-23 21:22:37,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:37,534 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 165 transitions. [2023-11-23 21:22:37,534 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 5 states have call successors, (5), 2 states have call predecessors, (5), 7 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2023-11-23 21:22:37,534 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 165 transitions. [2023-11-23 21:22:37,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-23 21:22:37,535 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:37,536 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:37,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:22:37,757 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:37,757 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-11-23 21:22:37,758 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:37,758 INFO L85 PathProgramCache]: Analyzing trace with hash -126915568, now seen corresponding path program 1 times [2023-11-23 21:22:37,758 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:37,758 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [50905710] [2023-11-23 21:22:37,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:37,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:37,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:38,400 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:22:38,400 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:38,400 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [50905710] [2023-11-23 21:22:38,401 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [50905710] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:22:38,401 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [74906031] [2023-11-23 21:22:38,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:38,401 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:38,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:38,402 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:22:38,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:22:38,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:38,520 INFO L262 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 45 conjunts are in the unsatisfiable core [2023-11-23 21:22:38,531 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:22:38,538 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 21:22:38,546 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 21:22:38,673 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int)) (and (= (store |c_old(#length)| alloc_and_zero_internal_~pi~1.base (select |c_#length| alloc_and_zero_internal_~pi~1.base)) |c_#length|) (= (select |c_old(#valid)| alloc_and_zero_internal_~pi~1.base) 0) (= |c_#valid| (store |c_old(#valid)| alloc_and_zero_internal_~pi~1.base 1)))) is different from true [2023-11-23 21:22:38,721 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int)) (and (= (store |c_old(#length)| alloc_and_zero_internal_~pi~1.base (select |c_#length| alloc_and_zero_internal_~pi~1.base)) |c_#length|) (= (select |c_old(#valid)| alloc_and_zero_internal_~pi~1.base) 0))) is different from true [2023-11-23 21:22:38,741 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int) (v_alloc_and_zero_internal_~pi~1.base_34 Int)) (and (= (select (store |c_old(#valid)| alloc_and_zero_internal_~pi~1.base 1) v_alloc_and_zero_internal_~pi~1.base_34) 0) (= |c_#length| (store (store |c_old(#length)| alloc_and_zero_internal_~pi~1.base (select |c_#length| alloc_and_zero_internal_~pi~1.base)) v_alloc_and_zero_internal_~pi~1.base_34 (select |c_#length| v_alloc_and_zero_internal_~pi~1.base_34))) (= (select |c_old(#valid)| alloc_and_zero_internal_~pi~1.base) 0))) is different from true [2023-11-23 21:22:38,791 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:22:38,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:22:38,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:22:38,794 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 9 [2023-11-23 21:22:38,817 INFO L349 Elim1Store]: treesize reduction 16, result has 36.0 percent of original size [2023-11-23 21:22:38,818 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 21:22:38,839 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 4 not checked. [2023-11-23 21:22:38,839 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:22:39,105 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [74906031] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:22:39,105 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1709902084] [2023-11-23 21:22:39,108 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-11-23 21:22:39,108 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:22:39,108 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:22:39,109 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:22:39,109 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:22:40,059 INFO L197 IcfgInterpreter]: Interpreting procedure create_internal with input of size 52 for LOIs [2023-11-23 21:22:41,248 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 55 for LOIs [2023-11-23 21:22:41,283 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-11-23 21:22:41,296 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:22:51,649 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3063#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_create_#t~ret10#1.offset| 0) (<= (select |#length| |ULTIMATE.start_create_~now~1#1.base|) 15) (or (and (<= (+ |ULTIMATE.start_create_~sll~1#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.offset_162| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_162| |ULTIMATE.start_create_#t~ret10#1.base| (store (select |v_#memory_$Pointer$.offset_162| |ULTIMATE.start_create_#t~ret10#1.base|) 0 0)))) (not (= |ULTIMATE.start_create_~sll~1#1.base| 0)) (not (= |ULTIMATE.start_create_#t~ret10#1.base| 0)) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (exists ((|v_#valid_178| (Array Int Int))) (and (= (store |v_#valid_178| |ULTIMATE.start_create_#t~ret10#1.base| 1) |#valid|) (= (select |v_#valid_178| |ULTIMATE.start_create_#t~ret10#1.base|) 0))) (exists ((|v_#length_154| (Array Int Int))) (= |#length| (store |v_#length_154| |ULTIMATE.start_create_#t~ret10#1.base| 8))) (exists ((|v_#memory_$Pointer$.base_162| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_162| |ULTIMATE.start_create_#t~ret10#1.base| (store (select |v_#memory_$Pointer$.base_162| |ULTIMATE.start_create_#t~ret10#1.base|) 0 0)))) (exists ((|v_#valid_177| (Array Int Int))) (= (select |v_#valid_177| |ULTIMATE.start_create_~sll~1#1.base|) 0)) (<= (+ |ULTIMATE.start_create_#t~ret10#1.base| 1) |#StackHeapBarrier|) (= |ULTIMATE.start_create_~now~1#1.base| |ULTIMATE.start_create_~sll~1#1.base|)) (and (<= (+ |ULTIMATE.start_create_~sll~1#1.base| 1) |#StackHeapBarrier|) (not (= |ULTIMATE.start_create_~sll~1#1.base| 0)) (exists ((|v_#memory_$Pointer$.base_162| (Array Int (Array Int Int))) (|v_#valid_178| (Array Int Int)) (|v_#memory_$Pointer$.offset_162| (Array Int (Array Int Int))) (v_create_internal_~now~0.base_35 Int) (|v_#length_154| (Array Int Int)) (v_create_internal_~now~0.offset_33 Int)) (and (= (store |v_#length_154| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33) 8) |#length|) (= (select |v_#valid_178| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33)) 0) (= 1 (select |#valid| v_create_internal_~now~0.base_35)) (= |#memory_$Pointer$.offset| (store (store |v_#memory_$Pointer$.offset_162| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33) (store (select |v_#memory_$Pointer$.offset_162| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33)) 0 0)) v_create_internal_~now~0.base_35 (store (select (store |v_#memory_$Pointer$.offset_162| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33) (store (select |v_#memory_$Pointer$.offset_162| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33)) 0 0)) v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33 0))) (not (= (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33) 0)) (<= (+ (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33) 1) |#StackHeapBarrier|) (= |#memory_$Pointer$.base| (store (store |v_#memory_$Pointer$.base_162| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33) (store (select |v_#memory_$Pointer$.base_162| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33)) 0 0)) v_create_internal_~now~0.base_35 (store (select (store |v_#memory_$Pointer$.base_162| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33) (store (select |v_#memory_$Pointer$.base_162| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33)) 0 0)) v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33 (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33)))) (<= (+ v_create_internal_~now~0.offset_33 8) (select |#length| v_create_internal_~now~0.base_35)) (= (store |v_#valid_178| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33) 1) |#valid|) (<= 0 v_create_internal_~now~0.offset_33))) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (exists ((|v_#valid_177| (Array Int Int))) (= (select |v_#valid_177| |ULTIMATE.start_create_~sll~1#1.base|) 0)) (= |ULTIMATE.start_create_~now~1#1.base| |ULTIMATE.start_create_~sll~1#1.base|))) (= |ULTIMATE.start_create_~now~1#1.offset| 0) (= |ULTIMATE.start_create_~sll~1#1.offset| 0))' at error location [2023-11-23 21:22:51,649 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:22:51,649 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:22:51,649 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 21 [2023-11-23 21:22:51,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802015679] [2023-11-23 21:22:51,650 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:22:51,650 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-23 21:22:51,651 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:51,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-23 21:22:51,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1477, Unknown=6, NotChecked=240, Total=1892 [2023-11-23 21:22:51,652 INFO L87 Difference]: Start difference. First operand 122 states and 165 transitions. Second operand has 22 states, 16 states have (on average 2.1875) internal successors, (35), 17 states have internal predecessors, (35), 6 states have call successors, (6), 2 states have call predecessors, (6), 8 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) [2023-11-23 21:22:52,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:52,708 INFO L93 Difference]: Finished difference Result 138 states and 186 transitions. [2023-11-23 21:22:52,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-23 21:22:52,709 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 16 states have (on average 2.1875) internal successors, (35), 17 states have internal predecessors, (35), 6 states have call successors, (6), 2 states have call predecessors, (6), 8 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) Word has length 26 [2023-11-23 21:22:52,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:52,711 INFO L225 Difference]: With dead ends: 138 [2023-11-23 21:22:52,711 INFO L226 Difference]: Without dead ends: 138 [2023-11-23 21:22:52,712 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=218, Invalid=1857, Unknown=7, NotChecked=270, Total=2352 [2023-11-23 21:22:52,713 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 37 mSDsluCounter, 281 mSDsCounter, 0 mSdLazyCounter, 643 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 336 SdHoareTripleChecker+Invalid, 1028 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 643 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 361 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:52,713 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 336 Invalid, 1028 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 643 Invalid, 0 Unknown, 361 Unchecked, 0.6s Time] [2023-11-23 21:22:52,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2023-11-23 21:22:52,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 119. [2023-11-23 21:22:52,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 74 states have (on average 1.7837837837837838) internal successors, (132), 101 states have internal predecessors, (132), 11 states have call successors, (11), 3 states have call predecessors, (11), 4 states have return successors, (15), 14 states have call predecessors, (15), 11 states have call successors, (15) [2023-11-23 21:22:52,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 158 transitions. [2023-11-23 21:22:52,720 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 158 transitions. Word has length 26 [2023-11-23 21:22:52,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:52,721 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 158 transitions. [2023-11-23 21:22:52,721 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 16 states have (on average 2.1875) internal successors, (35), 17 states have internal predecessors, (35), 6 states have call successors, (6), 2 states have call predecessors, (6), 8 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) [2023-11-23 21:22:52,721 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 158 transitions. [2023-11-23 21:22:52,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-23 21:22:52,722 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:52,722 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:52,743 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:22:52,938 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a0b08b-ac69-4ca7-bee5-96c0510794bb/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-23 21:22:52,939 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-11-23 21:22:52,939 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:52,939 INFO L85 PathProgramCache]: Analyzing trace with hash 516984702, now seen corresponding path program 1 times [2023-11-23 21:22:52,939 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:52,939 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [668317121] [2023-11-23 21:22:52,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:52,940 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:52,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:53,427 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 21:22:53,427 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:53,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [668317121] [2023-11-23 21:22:53,427 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [668317121] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:22:53,427 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:22:53,428 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2023-11-23 21:22:53,428 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076356091] [2023-11-23 21:22:53,428 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:22:53,428 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-23 21:22:53,429 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:53,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-23 21:22:53,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2023-11-23 21:22:53,430 INFO L87 Difference]: Start difference. First operand 119 states and 158 transitions. Second operand has 14 states, 9 states have (on average 2.111111111111111) internal successors, (19), 11 states have internal predecessors, (19), 2 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 21:22:53,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:53,910 INFO L93 Difference]: Finished difference Result 142 states and 182 transitions. [2023-11-23 21:22:53,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-23 21:22:53,911 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 9 states have (on average 2.111111111111111) internal successors, (19), 11 states have internal predecessors, (19), 2 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2023-11-23 21:22:53,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:53,913 INFO L225 Difference]: With dead ends: 142 [2023-11-23 21:22:53,913 INFO L226 Difference]: Without dead ends: 142 [2023-11-23 21:22:53,913 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2023-11-23 21:22:53,914 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 34 mSDsluCounter, 409 mSDsCounter, 0 mSdLazyCounter, 567 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 568 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 567 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:53,914 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 459 Invalid, 568 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 567 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 21:22:53,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2023-11-23 21:22:53,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 129. [2023-11-23 21:22:53,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 83 states have (on average 1.7349397590361446) internal successors, (144), 110 states have internal predecessors, (144), 11 states have call successors, (11), 3 states have call predecessors, (11), 5 states have return successors, (19), 15 states have call predecessors, (19), 11 states have call successors, (19) [2023-11-23 21:22:53,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 174 transitions. [2023-11-23 21:22:53,927 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 174 transitions. Word has length 25 [2023-11-23 21:22:53,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:53,927 INFO L495 AbstractCegarLoop]: Abstraction has 129 states and 174 transitions. [2023-11-23 21:22:53,928 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 9 states have (on average 2.111111111111111) internal successors, (19), 11 states have internal predecessors, (19), 2 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 21:22:53,928 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 174 transitions. [2023-11-23 21:22:53,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-23 21:22:53,930 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:53,931 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:53,931 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-11-23 21:22:53,931 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-11-23 21:22:53,932 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:53,932 INFO L85 PathProgramCache]: Analyzing trace with hash 516984703, now seen corresponding path program 1 times [2023-11-23 21:22:53,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:53,932 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870984057] [2023-11-23 21:22:53,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:53,933 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:53,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat