./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 9bd2c7ff 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_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety-broom/sll-nested-sll.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 89b7500933072598b3ae86cb9a0697a1fc30e47e1dd961db3afeb42e68cfc79e --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:23:48,350 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:23:48,474 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf [2023-11-19 05:23:48,482 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:23:48,484 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:23:48,527 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:23:48,528 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:23:48,528 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:23:48,529 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:23:48,530 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:23:48,530 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:23:48,531 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:23:48,532 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:23:48,532 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:23:48,533 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:23:48,533 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:23:48,534 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:23:48,534 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:23:48,535 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:23:48,535 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:23:48,536 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:23:48,536 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:23:48,537 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-19 05:23:48,538 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-19 05:23:48,538 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:23:48,539 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:23:48,539 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:23:48,540 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-19 05:23:48,540 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-19 05:23:48,540 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-19 05:23:48,541 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:23:48,541 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-19 05:23:48,541 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-19 05:23:48,542 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:23:48,542 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:23:48,542 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:23:48,543 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:23:48,543 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:23:48,543 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:23:48,543 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:23:48,544 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:23:48,544 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:23:48,544 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:23:48,544 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_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 89b7500933072598b3ae86cb9a0697a1fc30e47e1dd961db3afeb42e68cfc79e [2023-11-19 05:23:48,901 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:23:48,931 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:23:48,933 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:23:48,934 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:23:48,935 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:23:48,936 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/memsafety-broom/sll-nested-sll.i [2023-11-19 05:23:52,136 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:23:52,636 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:23:52,636 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/sv-benchmarks/c/memsafety-broom/sll-nested-sll.i [2023-11-19 05:23:52,689 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/data/ce78d981e/66c728cb3f9d4f0aa6c516e29c773aaf/FLAG0acb0bed8 [2023-11-19 05:23:52,708 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/data/ce78d981e/66c728cb3f9d4f0aa6c516e29c773aaf [2023-11-19 05:23:52,716 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:23:52,717 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:23:52,719 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:23:52,719 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:23:52,725 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:23:52,726 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:23:52" (1/1) ... [2023-11-19 05:23:52,727 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@255bea50 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:23:52, skipping insertion in model container [2023-11-19 05:23:52,727 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:23:52" (1/1) ... [2023-11-19 05:23:52,825 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:23:53,052 WARN L635 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2023-11-19 05:23:53,269 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:23:53,279 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:23:53,303 WARN L635 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2023-11-19 05:23:53,328 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:23:53,358 WARN L675 CHandler]: The function __builtin_bswap16 is called, but not defined or handled by StandardFunctionHandler. [2023-11-19 05:23:53,367 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:23:53,368 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:23:53 WrapperNode [2023-11-19 05:23:53,368 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:23:53,370 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:23:53,370 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:23:53,370 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:23:53,379 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:23:53" (1/1) ... [2023-11-19 05:23:53,408 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:23:53" (1/1) ... [2023-11-19 05:23:53,457 INFO L138 Inliner]: procedures = 123, calls = 34, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 89 [2023-11-19 05:23:53,457 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:23:53,458 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:23:53,458 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:23:53,458 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:23:53,469 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:23:53" (1/1) ... [2023-11-19 05:23:53,469 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:23:53" (1/1) ... [2023-11-19 05:23:53,486 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:23:53" (1/1) ... [2023-11-19 05:23:53,486 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:23:53" (1/1) ... [2023-11-19 05:23:53,508 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:23:53" (1/1) ... [2023-11-19 05:23:53,513 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:23:53" (1/1) ... [2023-11-19 05:23:53,515 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:23:53" (1/1) ... [2023-11-19 05:23:53,517 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:23:53" (1/1) ... [2023-11-19 05:23:53,522 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:23:53,523 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:23:53,523 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:23:53,523 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:23:53,524 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:23:53" (1/1) ... [2023-11-19 05:23:53,531 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:23:53,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:23:53,567 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:23:53,569 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:23:53,605 INFO L130 BoogieDeclarations]: Found specification of procedure alloc_and_zero_internal [2023-11-19 05:23:53,605 INFO L138 BoogieDeclarations]: Found implementation of procedure alloc_and_zero_internal [2023-11-19 05:23:53,605 INFO L130 BoogieDeclarations]: Found specification of procedure create_internal [2023-11-19 05:23:53,606 INFO L138 BoogieDeclarations]: Found implementation of procedure create_internal [2023-11-19 05:23:53,606 INFO L130 BoogieDeclarations]: Found specification of procedure alloc_and_zero [2023-11-19 05:23:53,606 INFO L138 BoogieDeclarations]: Found implementation of procedure alloc_and_zero [2023-11-19 05:23:53,606 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-19 05:23:53,607 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-19 05:23:53,609 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-19 05:23:53,610 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 05:23:53,610 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:23:53,610 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:23:53,760 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:23:53,762 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:23:54,185 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:23:54,264 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:23:54,265 INFO L302 CfgBuilder]: Removed 6 assume(true) statements. [2023-11-19 05:23:54,270 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:23:54 BoogieIcfgContainer [2023-11-19 05:23:54,270 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:23:54,273 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:23:54,273 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:23:54,277 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:23:54,277 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:23:52" (1/3) ... [2023-11-19 05:23:54,278 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f0e851f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:23:54, skipping insertion in model container [2023-11-19 05:23:54,279 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:23:53" (2/3) ... [2023-11-19 05:23:54,279 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f0e851f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:23:54, skipping insertion in model container [2023-11-19 05:23:54,279 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:23:54" (3/3) ... [2023-11-19 05:23:54,281 INFO L112 eAbstractionObserver]: Analyzing ICFG sll-nested-sll.i [2023-11-19 05:23:54,327 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:23:54,328 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 39 error locations. [2023-11-19 05:23:54,404 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:23:54,411 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;@d268986, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:23:54,411 INFO L358 AbstractCegarLoop]: Starting to check reachability of 39 error locations. [2023-11-19 05:23:54,416 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) [2023-11-19 05:23:54,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-19 05:23:54,424 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:23:54,425 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-19 05:23:54,426 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)] === [2023-11-19 05:23:54,430 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:23:54,431 INFO L85 PathProgramCache]: Analyzing trace with hash 6842322, now seen corresponding path program 1 times [2023-11-19 05:23:54,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:23:54,443 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549192235] [2023-11-19 05:23:54,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:23:54,444 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:23:54,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:23:54,677 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:23:54,678 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:23:54,678 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549192235] [2023-11-19 05:23:54,679 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549192235] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:23:54,679 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:23:54,679 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:23:54,681 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237345807] [2023-11-19 05:23:54,682 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:23:54,687 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:23:54,687 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:23:54,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:23:54,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:23:54,748 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) [2023-11-19 05:23:54,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:23:54,934 INFO L93 Difference]: Finished difference Result 85 states and 93 transitions. [2023-11-19 05:23:54,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:23:54,936 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 [2023-11-19 05:23:54,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:23:54,946 INFO L225 Difference]: With dead ends: 85 [2023-11-19 05:23:54,947 INFO L226 Difference]: Without dead ends: 84 [2023-11-19 05:23:54,949 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:23:54,955 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 [2023-11-19 05:23:54,957 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] [2023-11-19 05:23:54,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2023-11-19 05:23:54,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2023-11-19 05:23:54,999 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) [2023-11-19 05:23:55,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 92 transitions. [2023-11-19 05:23:55,003 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 92 transitions. Word has length 4 [2023-11-19 05:23:55,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:23:55,004 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 92 transitions. [2023-11-19 05:23:55,004 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) [2023-11-19 05:23:55,004 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 92 transitions. [2023-11-19 05:23:55,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-19 05:23:55,005 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:23:55,005 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-19 05:23:55,005 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:23:55,006 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)] === [2023-11-19 05:23:55,006 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:23:55,006 INFO L85 PathProgramCache]: Analyzing trace with hash 6842323, now seen corresponding path program 1 times [2023-11-19 05:23:55,007 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:23:55,007 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [939590515] [2023-11-19 05:23:55,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:23:55,007 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:23:55,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:23:55,128 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:23:55,129 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:23:55,129 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [939590515] [2023-11-19 05:23:55,130 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [939590515] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:23:55,130 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:23:55,130 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:23:55,131 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947591192] [2023-11-19 05:23:55,131 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:23:55,139 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:23:55,139 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:23:55,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:23:55,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:23:55,140 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) [2023-11-19 05:23:55,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:23:55,272 INFO L93 Difference]: Finished difference Result 82 states and 90 transitions. [2023-11-19 05:23:55,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:23:55,273 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 [2023-11-19 05:23:55,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:23:55,279 INFO L225 Difference]: With dead ends: 82 [2023-11-19 05:23:55,280 INFO L226 Difference]: Without dead ends: 82 [2023-11-19 05:23:55,284 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:23:55,288 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 [2023-11-19 05:23:55,289 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] [2023-11-19 05:23:55,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2023-11-19 05:23:55,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2023-11-19 05:23:55,305 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) [2023-11-19 05:23:55,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 90 transitions. [2023-11-19 05:23:55,314 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 90 transitions. Word has length 4 [2023-11-19 05:23:55,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:23:55,316 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 90 transitions. [2023-11-19 05:23:55,317 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) [2023-11-19 05:23:55,317 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 90 transitions. [2023-11-19 05:23:55,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-19 05:23:55,317 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:23:55,317 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:23:55,318 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 05:23:55,318 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)] === [2023-11-19 05:23:55,319 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:23:55,319 INFO L85 PathProgramCache]: Analyzing trace with hash -116967137, now seen corresponding path program 1 times [2023-11-19 05:23:55,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:23:55,320 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2085739389] [2023-11-19 05:23:55,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:23:55,320 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:23:55,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:23:55,429 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:23:55,430 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:23:55,430 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2085739389] [2023-11-19 05:23:55,430 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2085739389] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:23:55,431 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:23:55,431 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:23:55,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401477961] [2023-11-19 05:23:55,431 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:23:55,432 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:23:55,432 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:23:55,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:23:55,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:23:55,434 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) [2023-11-19 05:23:55,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:23:55,523 INFO L93 Difference]: Finished difference Result 81 states and 89 transitions. [2023-11-19 05:23:55,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:23:55,524 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 [2023-11-19 05:23:55,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:23:55,526 INFO L225 Difference]: With dead ends: 81 [2023-11-19 05:23:55,527 INFO L226 Difference]: Without dead ends: 81 [2023-11-19 05:23:55,527 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:23:55,529 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 [2023-11-19 05:23:55,530 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] [2023-11-19 05:23:55,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-11-19 05:23:55,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2023-11-19 05:23:55,539 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) [2023-11-19 05:23:55,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 89 transitions. [2023-11-19 05:23:55,541 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 89 transitions. Word has length 11 [2023-11-19 05:23:55,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:23:55,543 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 89 transitions. [2023-11-19 05:23:55,543 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) [2023-11-19 05:23:55,543 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 89 transitions. [2023-11-19 05:23:55,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-19 05:23:55,544 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:23:55,544 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:23:55,545 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-19 05:23:55,545 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)] === [2023-11-19 05:23:55,546 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:23:55,546 INFO L85 PathProgramCache]: Analyzing trace with hash -116967136, now seen corresponding path program 1 times [2023-11-19 05:23:55,546 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:23:55,547 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790621311] [2023-11-19 05:23:55,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:23:55,547 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:23:55,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:23:55,748 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:23:55,749 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:23:55,749 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790621311] [2023-11-19 05:23:55,750 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [790621311] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:23:55,750 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:23:55,750 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:23:55,750 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360053687] [2023-11-19 05:23:55,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:23:55,751 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:23:55,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:23:55,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:23:55,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:23:55,753 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) [2023-11-19 05:23:55,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:23:55,884 INFO L93 Difference]: Finished difference Result 80 states and 88 transitions. [2023-11-19 05:23:55,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:23:55,885 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 [2023-11-19 05:23:55,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:23:55,889 INFO L225 Difference]: With dead ends: 80 [2023-11-19 05:23:55,890 INFO L226 Difference]: Without dead ends: 80 [2023-11-19 05:23:55,891 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:23:55,903 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 [2023-11-19 05:23:55,905 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] [2023-11-19 05:23:55,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-11-19 05:23:55,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2023-11-19 05:23:55,921 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) [2023-11-19 05:23:55,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 88 transitions. [2023-11-19 05:23:55,926 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 88 transitions. Word has length 11 [2023-11-19 05:23:55,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:23:55,927 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 88 transitions. [2023-11-19 05:23:55,927 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) [2023-11-19 05:23:55,928 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 88 transitions. [2023-11-19 05:23:55,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-19 05:23:55,929 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:23:55,929 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:23:55,930 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-19 05:23:55,930 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)] === [2023-11-19 05:23:55,931 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:23:55,931 INFO L85 PathProgramCache]: Analyzing trace with hash 1608398490, now seen corresponding path program 1 times [2023-11-19 05:23:55,931 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:23:55,931 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [757906988] [2023-11-19 05:23:55,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:23:55,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:23:55,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:23:56,453 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:23:56,455 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:23:56,455 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [757906988] [2023-11-19 05:23:56,455 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [757906988] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:23:56,455 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:23:56,456 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-19 05:23:56,456 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033961785] [2023-11-19 05:23:56,457 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:23:56,457 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 05:23:56,459 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:23:56,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 05:23:56,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2023-11-19 05:23:56,461 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) [2023-11-19 05:23:56,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:23:56,930 INFO L93 Difference]: Finished difference Result 97 states and 110 transitions. [2023-11-19 05:23:56,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-19 05:23:56,931 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 [2023-11-19 05:23:56,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:23:56,934 INFO L225 Difference]: With dead ends: 97 [2023-11-19 05:23:56,934 INFO L226 Difference]: Without dead ends: 97 [2023-11-19 05:23:56,934 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2023-11-19 05:23:56,935 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 18 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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 [2023-11-19 05:23:56,935 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] [2023-11-19 05:23:56,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2023-11-19 05:23:56,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 90. [2023-11-19 05:23:56,945 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) [2023-11-19 05:23:56,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 107 transitions. [2023-11-19 05:23:56,947 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 107 transitions. Word has length 18 [2023-11-19 05:23:56,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:23:56,948 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 107 transitions. [2023-11-19 05:23:56,948 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) [2023-11-19 05:23:56,948 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 107 transitions. [2023-11-19 05:23:56,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-19 05:23:56,949 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:23:56,950 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:23:56,950 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-19 05:23:56,950 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)] === [2023-11-19 05:23:56,951 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:23:56,951 INFO L85 PathProgramCache]: Analyzing trace with hash 1608398491, now seen corresponding path program 1 times [2023-11-19 05:23:56,951 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:23:56,952 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1336845412] [2023-11-19 05:23:56,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:23:56,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:23:56,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:23:57,459 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:23:57,459 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:23:57,460 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1336845412] [2023-11-19 05:23:57,460 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1336845412] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:23:57,460 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:23:57,460 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2023-11-19 05:23:57,461 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418029824] [2023-11-19 05:23:57,461 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:23:57,461 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-19 05:23:57,462 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:23:57,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-19 05:23:57,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2023-11-19 05:23:57,468 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) [2023-11-19 05:23:57,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:23:57,993 INFO L93 Difference]: Finished difference Result 102 states and 123 transitions. [2023-11-19 05:23:57,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:23:57,997 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 [2023-11-19 05:23:57,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:23:57,998 INFO L225 Difference]: With dead ends: 102 [2023-11-19 05:23:57,999 INFO L226 Difference]: Without dead ends: 102 [2023-11-19 05:23:57,999 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 [2023-11-19 05:23:58,000 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 18 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 484 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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, 0.4s IncrementalHoareTripleChecker+Time [2023-11-19 05:23:58,000 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 276 Invalid, 500 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 484 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-19 05:23:58,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2023-11-19 05:23:58,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 98. [2023-11-19 05:23:58,009 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) [2023-11-19 05:23:58,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 120 transitions. [2023-11-19 05:23:58,011 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 120 transitions. Word has length 18 [2023-11-19 05:23:58,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:23:58,011 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 120 transitions. [2023-11-19 05:23:58,012 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) [2023-11-19 05:23:58,012 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 120 transitions. [2023-11-19 05:23:58,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-19 05:23:58,013 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:23:58,013 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:23:58,013 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-19 05:23:58,013 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)] === [2023-11-19 05:23:58,014 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:23:58,014 INFO L85 PathProgramCache]: Analyzing trace with hash -475664253, now seen corresponding path program 1 times [2023-11-19 05:23:58,014 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:23:58,014 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507456436] [2023-11-19 05:23:58,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:23:58,015 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:23:58,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:23:58,245 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:23:58,245 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:23:58,245 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507456436] [2023-11-19 05:23:58,245 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1507456436] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:23:58,246 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [430668310] [2023-11-19 05:23:58,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:23:58,246 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:23:58,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:23:58,249 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:23:58,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:23:58,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:23:58,368 INFO L262 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-19 05:23:58,375 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:23:58,427 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 [2023-11-19 05:23:58,464 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 [2023-11-19 05:23:58,493 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-19 05:23:58,493 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 [2023-11-19 05:23:58,505 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2023-11-19 05:23:58,506 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:23:58,653 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:23:58,653 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [430668310] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:23:58,653 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1491413692] [2023-11-19 05:23:58,695 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-19 05:23:58,695 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:23:58,700 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:23:58,707 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:23:58,707 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:23:58,909 INFO L197 IcfgInterpreter]: Interpreting procedure create_internal with input of size 52 for LOIs [2023-11-19 05:23:59,438 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 96 for LOIs [2023-11-19 05:23:59,554 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-11-19 05:23:59,575 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:24:03,438 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$.base_92| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_92| |create_internal_#t~ret7.base| (store (select |v_#memory_$Pointer$.base_92| |create_internal_#t~ret7.base|) 0 0)) |#memory_$Pointer$.base|)) (exists ((|v_#valid_110| (Array Int Int)) (|v_#length_90| (Array Int Int)) (|v_#memory_$Pointer$.base_90| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_90| (Array Int (Array Int Int))) (|v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| Int)) (and (= |old(#memory_$Pointer$.base)| (store |v_#memory_$Pointer$.base_90| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| (store (store (select |v_#memory_$Pointer$.base_90| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1|) 0 0) 8 0))) (= |old(#memory_$Pointer$.offset)| (store |v_#memory_$Pointer$.offset_90| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| (store (store (select |v_#memory_$Pointer$.offset_90| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1|) 0 0) 8 0))) (= (store |v_#valid_110| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| 1) |old(#valid)|) (= (store |v_#length_90| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| 16) |old(#length)|) (= (select |v_#valid_110| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1|) 0) (<= (+ |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| 1) |#StackHeapBarrier|) (not (= |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| 0)))) (exists ((|v_#memory_$Pointer$.offset_92| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_92| |create_internal_#t~ret7.base| (store (select |v_#memory_$Pointer$.offset_92| |create_internal_#t~ret7.base|) 0 0)))) (exists ((|v_#valid_111| (Array Int Int))) (= (select |v_#valid_111| create_internal_~sll~0.base) 0)) (exists ((|v_ULTIMATE.start_main_old_#valid#1_BEFORE_CALL_3| (Array Int Int))) (= (select |v_ULTIMATE.start_main_old_#valid#1_BEFORE_CALL_3| 0) 0)) (not (= |create_internal_#t~ret7.base| 0)) (exists ((|v_create_internal_#t~nondet6_7| Int)) (and (not (= |v_create_internal_#t~nondet6_7| 0)) (<= 0 (+ |v_create_internal_#t~nondet6_7| 2147483648)) (<= |v_create_internal_#t~nondet6_7| 2147483647))) (exists ((|v_#length_92| (Array Int Int))) (= |#length| (store |v_#length_92| |create_internal_#t~ret7.base| 8))) (exists ((|v_#valid_112| (Array Int Int))) (and (= (select |v_#valid_112| |create_internal_#t~ret7.base|) 0) (= (store |v_#valid_112| |create_internal_#t~ret7.base| 1) |#valid|))) (not (= create_internal_~sll~0.base 0)) (= create_internal_~now~0.base create_internal_~sll~0.base) (<= (+ |create_internal_#t~ret7.base| 1) |#StackHeapBarrier|)) (and (<= (+ create_internal_~sll~0.base 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.base_94| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_94| |create_internal_#t~ret7.base| (store (select |v_#memory_$Pointer$.base_94| |create_internal_#t~ret7.base|) 0 0)) |#memory_$Pointer$.base|)) (exists ((|v_#valid_110| (Array Int Int)) (|v_#length_90| (Array Int Int)) (|v_#memory_$Pointer$.base_90| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_90| (Array Int (Array Int Int))) (|v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| Int)) (and (= |old(#memory_$Pointer$.base)| (store |v_#memory_$Pointer$.base_90| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| (store (store (select |v_#memory_$Pointer$.base_90| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1|) 0 0) 8 0))) (= |old(#memory_$Pointer$.offset)| (store |v_#memory_$Pointer$.offset_90| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| (store (store (select |v_#memory_$Pointer$.offset_90| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1|) 0 0) 8 0))) (= (store |v_#valid_110| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| 1) |old(#valid)|) (= (store |v_#length_90| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| 16) |old(#length)|) (= (select |v_#valid_110| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1|) 0) (<= (+ |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| 1) |#StackHeapBarrier|) (not (= |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_1| 0)))) (exists ((|v_#valid_111| (Array Int Int))) (= (select |v_#valid_111| create_internal_~sll~0.base) 0)) (exists ((|v_ULTIMATE.start_main_old_#valid#1_BEFORE_CALL_3| (Array Int Int))) (= (select |v_ULTIMATE.start_main_old_#valid#1_BEFORE_CALL_3| 0) 0)) (not (= |create_internal_#t~ret7.base| 0)) (exists ((|v_create_internal_#t~nondet6_7| Int)) (and (not (= |v_create_internal_#t~nondet6_7| 0)) (<= 0 (+ |v_create_internal_#t~nondet6_7| 2147483648)) (<= |v_create_internal_#t~nondet6_7| 2147483647))) (exists ((|v_#memory_$Pointer$.offset_94| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_94| |create_internal_#t~ret7.base| (store (select |v_#memory_$Pointer$.offset_94| |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|) (exists ((|v_#length_91| (Array Int Int))) (= (store |v_#length_91| |create_internal_#t~ret7.base| 8) |#length|)) (exists ((|v_#valid_113| (Array Int Int))) (and (= (store |v_#valid_113| |create_internal_#t~ret7.base| 1) |#valid|) (= (select |v_#valid_113| |create_internal_#t~ret7.base|) 0))))) (not (= (select |#valid| create_internal_~now~0.base) 1)) (= |create_internal_#t~ret7.offset| 0))' at error location [2023-11-19 05:24:03,439 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:24:03,439 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:24:03,439 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 6] total 10 [2023-11-19 05:24:03,439 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304185038] [2023-11-19 05:24:03,439 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:24:03,440 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-19 05:24:03,440 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:24:03,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-19 05:24:03,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=565, Unknown=1, NotChecked=48, Total=702 [2023-11-19 05:24:03,441 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) [2023-11-19 05:24:04,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:24:04,007 INFO L93 Difference]: Finished difference Result 100 states and 123 transitions. [2023-11-19 05:24:04,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:24:04,008 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 [2023-11-19 05:24:04,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:24:04,009 INFO L225 Difference]: With dead ends: 100 [2023-11-19 05:24:04,009 INFO L226 Difference]: Without dead ends: 100 [2023-11-19 05:24:04,010 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 [2023-11-19 05:24:04,010 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, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:24:04,011 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 279 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 360 Invalid, 0 Unknown, 94 Unchecked, 0.3s Time] [2023-11-19 05:24:04,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-11-19 05:24:04,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2023-11-19 05:24:04,017 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) [2023-11-19 05:24:04,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 123 transitions. [2023-11-19 05:24:04,019 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 123 transitions. Word has length 20 [2023-11-19 05:24:04,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:24:04,019 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 123 transitions. [2023-11-19 05:24:04,020 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) [2023-11-19 05:24:04,020 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 123 transitions. [2023-11-19 05:24:04,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-19 05:24:04,021 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:04,021 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:24:04,047 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:24:04,234 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-19 05:24:04,235 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)] === [2023-11-19 05:24:04,235 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:04,235 INFO L85 PathProgramCache]: Analyzing trace with hash -475664252, now seen corresponding path program 1 times [2023-11-19 05:24:04,235 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:04,236 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186645441] [2023-11-19 05:24:04,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:04,236 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:04,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:04,614 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:24:04,615 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:24:04,615 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [186645441] [2023-11-19 05:24:04,615 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [186645441] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:24:04,616 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [567134531] [2023-11-19 05:24:04,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:04,616 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:04,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:24:04,618 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:24:04,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:24:04,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:04,719 INFO L262 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-19 05:24:04,726 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:24:04,733 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 [2023-11-19 05:24:04,802 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 [2023-11-19 05:24:04,818 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-19 05:24:04,818 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 [2023-11-19 05:24:04,838 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2023-11-19 05:24:04,839 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:24:04,947 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [567134531] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:24:04,947 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [677999824] [2023-11-19 05:24:04,950 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-19 05:24:04,950 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:24:04,951 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:24:04,951 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:24:04,951 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:24:05,047 INFO L197 IcfgInterpreter]: Interpreting procedure create_internal with input of size 52 for LOIs [2023-11-19 05:24:05,360 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 90 for LOIs [2023-11-19 05:24:05,431 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-11-19 05:24:05,444 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:24:08,801 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$.base_104| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_104| |create_internal_#t~ret7.base| (store (select |v_#memory_$Pointer$.base_104| |create_internal_#t~ret7.base|) 0 0)) |#memory_$Pointer$.base|)) (exists ((|v_create_internal_#t~nondet6_8| Int)) (and (not (= |v_create_internal_#t~nondet6_8| 0)) (<= 0 (+ |v_create_internal_#t~nondet6_8| 2147483648)) (<= |v_create_internal_#t~nondet6_8| 2147483647))) (exists ((|v_#valid_123| (Array Int Int))) (= (select |v_#valid_123| create_internal_~sll~0.base) 0)) (not (= |create_internal_#t~ret7.base| 0)) (exists ((|v_ULTIMATE.start_main_old_#valid#1_BEFORE_CALL_7| (Array Int Int))) (= (select |v_ULTIMATE.start_main_old_#valid#1_BEFORE_CALL_7| 0) 0)) (not (= create_internal_~sll~0.base 0)) (= create_internal_~now~0.base create_internal_~sll~0.base) (<= (+ |create_internal_#t~ret7.base| 1) |#StackHeapBarrier|) (exists ((|v_#valid_121| (Array Int Int))) (and (= (select |v_#valid_121| |create_internal_#t~ret7.base|) 0) (= (store |v_#valid_121| |create_internal_#t~ret7.base| 1) |#valid|))) (exists ((|v_#memory_$Pointer$.offset_106| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_106| |create_internal_#t~ret7.base| (store (select |v_#memory_$Pointer$.offset_106| |create_internal_#t~ret7.base|) 0 0)))) (exists ((|v_#valid_120| (Array Int Int)) (|v_#length_104| (Array Int Int)) (|v_#memory_$Pointer$.base_102| (Array Int (Array Int Int))) (|v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| Int) (|v_#memory_$Pointer$.offset_102| (Array Int (Array Int Int)))) (and (= (store |v_#memory_$Pointer$.base_102| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| (store (store (select |v_#memory_$Pointer$.base_102| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2|) 0 0) 8 0)) |old(#memory_$Pointer$.base)|) (not (= |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| 0)) (= |old(#memory_$Pointer$.offset)| (store |v_#memory_$Pointer$.offset_102| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| (store (store (select |v_#memory_$Pointer$.offset_102| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2|) 0 0) 8 0))) (= (select |v_#valid_120| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2|) 0) (= |old(#valid)| (store |v_#valid_120| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| 1)) (= (store |v_#length_104| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| 16) |old(#length)|) (<= (+ |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| 1) |#StackHeapBarrier|))) (exists ((|v_#length_105| (Array Int Int))) (= (store |v_#length_105| |create_internal_#t~ret7.base| 8) |#length|))) (and (exists ((|v_#memory_$Pointer$.offset_105| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_105| |create_internal_#t~ret7.base| (store (select |v_#memory_$Pointer$.offset_105| |create_internal_#t~ret7.base|) 0 0)))) (<= (+ create_internal_~sll~0.base 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.base_104| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_104| |create_internal_#t~ret7.base| (store (select |v_#memory_$Pointer$.base_104| |create_internal_#t~ret7.base|) 0 0)) |#memory_$Pointer$.base|)) (exists ((|v_create_internal_#t~nondet6_8| Int)) (and (not (= |v_create_internal_#t~nondet6_8| 0)) (<= 0 (+ |v_create_internal_#t~nondet6_8| 2147483648)) (<= |v_create_internal_#t~nondet6_8| 2147483647))) (not (= |create_internal_#t~ret7.base| 0)) (exists ((|v_ULTIMATE.start_main_old_#valid#1_BEFORE_CALL_7| (Array Int Int))) (= (select |v_ULTIMATE.start_main_old_#valid#1_BEFORE_CALL_7| 0) 0)) (not (= create_internal_~sll~0.base 0)) (= create_internal_~now~0.base create_internal_~sll~0.base) (<= (+ |create_internal_#t~ret7.base| 1) |#StackHeapBarrier|) (exists ((|v_#valid_122| (Array Int Int))) (and (= (store |v_#valid_122| |create_internal_#t~ret7.base| 1) |#valid|) (= (select |v_#valid_122| |create_internal_#t~ret7.base|) 0))) (exists ((|v_#valid_120| (Array Int Int)) (|v_#length_104| (Array Int Int)) (|v_#memory_$Pointer$.base_102| (Array Int (Array Int Int))) (|v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| Int) (|v_#memory_$Pointer$.offset_102| (Array Int (Array Int Int)))) (and (= (store |v_#memory_$Pointer$.base_102| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| (store (store (select |v_#memory_$Pointer$.base_102| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2|) 0 0) 8 0)) |old(#memory_$Pointer$.base)|) (not (= |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| 0)) (= |old(#memory_$Pointer$.offset)| (store |v_#memory_$Pointer$.offset_102| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| (store (store (select |v_#memory_$Pointer$.offset_102| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2|) 0 0) 8 0))) (= (select |v_#valid_120| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2|) 0) (= |old(#valid)| (store |v_#valid_120| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| 1)) (= (store |v_#length_104| |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| 16) |old(#length)|) (<= (+ |v_ULTIMATE.start_create_~now~1#1.base_BEFORE_CALL_2| 1) |#StackHeapBarrier|))) (exists ((|v_#length_105| (Array Int Int))) (= (store |v_#length_105| |create_internal_#t~ret7.base| 8) |#length|)) (exists ((|v_#valid_121| (Array Int Int))) (= (select |v_#valid_121| create_internal_~sll~0.base) 0)))))' at error location [2023-11-19 05:24:08,802 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:24:08,802 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:24:08,802 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 13 [2023-11-19 05:24:08,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758491458] [2023-11-19 05:24:08,802 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:24:08,803 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-19 05:24:08,803 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:24:08,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-19 05:24:08,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=827, Unknown=1, NotChecked=58, Total=992 [2023-11-19 05:24:08,804 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) [2023-11-19 05:24:09,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:24:09,271 INFO L93 Difference]: Finished difference Result 100 states and 123 transitions. [2023-11-19 05:24:09,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:24:09,272 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 [2023-11-19 05:24:09,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:24:09,274 INFO L225 Difference]: With dead ends: 100 [2023-11-19 05:24:09,274 INFO L226 Difference]: Without dead ends: 100 [2023-11-19 05:24:09,275 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=134, Invalid=1059, Unknown=1, NotChecked=66, Total=1260 [2023-11-19 05:24:09,275 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 [2023-11-19 05:24:09,276 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] [2023-11-19 05:24:09,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-11-19 05:24:09,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2023-11-19 05:24:09,281 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) [2023-11-19 05:24:09,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 123 transitions. [2023-11-19 05:24:09,285 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 123 transitions. Word has length 20 [2023-11-19 05:24:09,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:24:09,286 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 123 transitions. [2023-11-19 05:24:09,286 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) [2023-11-19 05:24:09,286 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 123 transitions. [2023-11-19 05:24:09,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-19 05:24:09,287 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:09,288 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] [2023-11-19 05:24:09,313 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:24:09,508 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:09,509 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)] === [2023-11-19 05:24:09,509 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:09,509 INFO L85 PathProgramCache]: Analyzing trace with hash 1118586666, now seen corresponding path program 1 times [2023-11-19 05:24:09,509 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:09,510 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137757501] [2023-11-19 05:24:09,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:09,510 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:09,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:09,588 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:24:09,589 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:24:09,589 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [137757501] [2023-11-19 05:24:09,589 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [137757501] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:24:09,589 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:24:09,589 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 05:24:09,590 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700040482] [2023-11-19 05:24:09,590 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:24:09,590 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:24:09,590 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:24:09,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:24:09,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:24:09,592 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) [2023-11-19 05:24:09,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:24:09,735 INFO L93 Difference]: Finished difference Result 119 states and 149 transitions. [2023-11-19 05:24:09,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:24:09,736 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 [2023-11-19 05:24:09,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:24:09,738 INFO L225 Difference]: With dead ends: 119 [2023-11-19 05:24:09,738 INFO L226 Difference]: Without dead ends: 119 [2023-11-19 05:24:09,738 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 [2023-11-19 05:24:09,740 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 [2023-11-19 05:24:09,741 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] [2023-11-19 05:24:09,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2023-11-19 05:24:09,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 110. [2023-11-19 05:24:09,759 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) [2023-11-19 05:24:09,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 146 transitions. [2023-11-19 05:24:09,761 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 146 transitions. Word has length 23 [2023-11-19 05:24:09,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:24:09,763 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 146 transitions. [2023-11-19 05:24:09,763 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) [2023-11-19 05:24:09,764 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 146 transitions. [2023-11-19 05:24:09,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-19 05:24:09,765 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:09,765 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] [2023-11-19 05:24:09,765 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-19 05:24:09,766 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)] === [2023-11-19 05:24:09,766 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:09,766 INFO L85 PathProgramCache]: Analyzing trace with hash 1118586667, now seen corresponding path program 1 times [2023-11-19 05:24:09,766 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:09,767 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122370739] [2023-11-19 05:24:09,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:09,767 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:09,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:09,933 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:24:09,933 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:24:09,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122370739] [2023-11-19 05:24:09,934 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2122370739] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:24:09,934 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:24:09,934 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-19 05:24:09,934 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582497421] [2023-11-19 05:24:09,934 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:24:09,935 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 05:24:09,935 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:24:09,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 05:24:09,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:24:09,936 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) [2023-11-19 05:24:10,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:24:10,137 INFO L93 Difference]: Finished difference Result 124 states and 156 transitions. [2023-11-19 05:24:10,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 05:24:10,137 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 [2023-11-19 05:24:10,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:24:10,139 INFO L225 Difference]: With dead ends: 124 [2023-11-19 05:24:10,140 INFO L226 Difference]: Without dead ends: 124 [2023-11-19 05:24:10,140 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 [2023-11-19 05:24:10,140 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 23 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 243 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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 [2023-11-19 05:24:10,141 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] [2023-11-19 05:24:10,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2023-11-19 05:24:10,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 116. [2023-11-19 05:24:10,147 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) [2023-11-19 05:24:10,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 156 transitions. [2023-11-19 05:24:10,149 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 156 transitions. Word has length 23 [2023-11-19 05:24:10,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:24:10,149 INFO L495 AbstractCegarLoop]: Abstraction has 116 states and 156 transitions. [2023-11-19 05:24:10,150 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) [2023-11-19 05:24:10,150 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 156 transitions. [2023-11-19 05:24:10,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-19 05:24:10,151 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:10,151 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] [2023-11-19 05:24:10,151 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-11-19 05:24:10,152 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)] === [2023-11-19 05:24:10,152 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:10,152 INFO L85 PathProgramCache]: Analyzing trace with hash 316592683, now seen corresponding path program 1 times [2023-11-19 05:24:10,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:10,153 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [833907950] [2023-11-19 05:24:10,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:10,163 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:10,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:10,246 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:24:10,246 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:24:10,247 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [833907950] [2023-11-19 05:24:10,247 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [833907950] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:24:10,247 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:24:10,247 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-19 05:24:10,247 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795706071] [2023-11-19 05:24:10,248 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:24:10,248 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 05:24:10,248 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:24:10,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 05:24:10,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:24:10,249 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) [2023-11-19 05:24:10,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:24:10,357 INFO L93 Difference]: Finished difference Result 126 states and 165 transitions. [2023-11-19 05:24:10,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 05:24:10,358 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 [2023-11-19 05:24:10,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:24:10,359 INFO L225 Difference]: With dead ends: 126 [2023-11-19 05:24:10,359 INFO L226 Difference]: Without dead ends: 126 [2023-11-19 05:24:10,360 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 [2023-11-19 05:24:10,360 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 [2023-11-19 05:24:10,361 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] [2023-11-19 05:24:10,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2023-11-19 05:24:10,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 117. [2023-11-19 05:24:10,366 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) [2023-11-19 05:24:10,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 155 transitions. [2023-11-19 05:24:10,368 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 155 transitions. Word has length 24 [2023-11-19 05:24:10,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:24:10,368 INFO L495 AbstractCegarLoop]: Abstraction has 117 states and 155 transitions. [2023-11-19 05:24:10,368 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) [2023-11-19 05:24:10,368 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 155 transitions. [2023-11-19 05:24:10,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-19 05:24:10,370 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:10,370 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] [2023-11-19 05:24:10,370 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-19 05:24:10,370 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)] === [2023-11-19 05:24:10,371 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:10,371 INFO L85 PathProgramCache]: Analyzing trace with hash -1118628324, now seen corresponding path program 1 times [2023-11-19 05:24:10,371 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:10,371 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [978516682] [2023-11-19 05:24:10,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:10,371 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:10,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:10,865 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:24:10,865 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:24:10,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [978516682] [2023-11-19 05:24:10,866 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [978516682] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:24:10,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1552883586] [2023-11-19 05:24:10,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:10,866 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:10,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:24:10,868 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:24:10,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:24:11,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:11,011 INFO L262 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 24 conjunts are in the unsatisfiable core [2023-11-19 05:24:11,015 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:24:11,023 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 [2023-11-19 05:24:11,044 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 [2023-11-19 05:24:11,075 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 [2023-11-19 05:24:11,284 INFO L349 Elim1Store]: treesize reduction 104, result has 34.2 percent of original size [2023-11-19 05:24:11,285 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 [2023-11-19 05:24:11,536 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-19 05:24:11,545 INFO L349 Elim1Store]: treesize reduction 25, result has 16.7 percent of original size [2023-11-19 05:24:11,546 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 [2023-11-19 05:24:11,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:24:11,609 INFO L349 Elim1Store]: treesize reduction 425, result has 0.2 percent of original size [2023-11-19 05:24:11,610 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 [2023-11-19 05:24:11,795 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 4 not checked. [2023-11-19 05:24:11,796 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:24:11,895 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1552883586] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:24:11,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1347275659] [2023-11-19 05:24:11,898 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-11-19 05:24:11,899 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:24:11,899 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:24:11,899 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:24:11,900 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:24:13,009 INFO L197 IcfgInterpreter]: Interpreting procedure create_internal with input of size 54 for LOIs [2023-11-19 05:24:14,293 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 53 for LOIs [2023-11-19 05:24:14,325 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-11-19 05:24:14,338 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:24:18,172 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 (<= (+ |ULTIMATE.start_create_~sll~1#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#valid_146| (Array Int Int))) (= (select |v_#valid_146| |ULTIMATE.start_create_~sll~1#1.base|) 0)) (exists ((v_create_internal_~now~0.offset_21 Int) (|v_#valid_147| (Array Int Int)) (v_create_internal_~now~0.base_23 Int) (|v_#memory_$Pointer$.base_124| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_124| (Array Int (Array Int Int))) (|v_#length_122| (Array Int Int))) (and (= (store (store |v_#memory_$Pointer$.offset_124| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21) (store (select |v_#memory_$Pointer$.offset_124| (select (select |#memory_$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$.offset_124| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21) (store (select |v_#memory_$Pointer$.offset_124| (select (select |#memory_$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$.offset|) (= (store (store |v_#memory_$Pointer$.base_124| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21) (store (select |v_#memory_$Pointer$.base_124| (select (select |#memory_$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$.base_124| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21) (store (select |v_#memory_$Pointer$.base_124| (select (select |#memory_$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$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21))) |#memory_$Pointer$.base|) (<= (+ v_create_internal_~now~0.offset_21 8) (select |#length| v_create_internal_~now~0.base_23)) (<= (+ (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21) 1) |#StackHeapBarrier|) (<= 0 v_create_internal_~now~0.offset_21) (= (select |v_#valid_147| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21)) 0) (not (= (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21) 0)) (= (store |v_#length_122| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21) 8) |#length|) (= (store |v_#valid_147| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_23) v_create_internal_~now~0.offset_21) 1) |#valid|) (= (select |#valid| v_create_internal_~now~0.base_23) 1))) (not (= |ULTIMATE.start_create_~sll~1#1.base| 0)) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (= |ULTIMATE.start_create_~now~1#1.base| |ULTIMATE.start_create_~sll~1#1.base|)) (and (<= (+ |ULTIMATE.start_create_~sll~1#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#valid_146| (Array Int Int))) (= (select |v_#valid_146| |ULTIMATE.start_create_~sll~1#1.base|) 0)) (not (= |ULTIMATE.start_create_~sll~1#1.base| 0)) (exists ((|v_#valid_147| (Array Int Int))) (and (= |#valid| (store |v_#valid_147| |ULTIMATE.start_create_#t~ret10#1.base| 1)) (= 0 (select |v_#valid_147| |ULTIMATE.start_create_#t~ret10#1.base|)))) (exists ((|v_#memory_$Pointer$.base_124| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_124| |ULTIMATE.start_create_#t~ret10#1.base| (store (select |v_#memory_$Pointer$.base_124| |ULTIMATE.start_create_#t~ret10#1.base|) 0 0)))) (not (= |ULTIMATE.start_create_#t~ret10#1.base| 0)) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (exists ((|v_#length_122| (Array Int Int))) (= (store |v_#length_122| |ULTIMATE.start_create_#t~ret10#1.base| 8) |#length|)) (exists ((|v_#memory_$Pointer$.offset_124| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_124| |ULTIMATE.start_create_#t~ret10#1.base| (store (select |v_#memory_$Pointer$.offset_124| |ULTIMATE.start_create_#t~ret10#1.base|) 0 0)))) (<= (+ |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 [2023-11-19 05:24:18,172 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:24:18,172 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:24:18,173 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 16 [2023-11-19 05:24:18,173 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010605768] [2023-11-19 05:24:18,173 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:24:18,174 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-19 05:24:18,174 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:24:18,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-19 05:24:18,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1117, Unknown=3, NotChecked=138, Total=1406 [2023-11-19 05:24:18,176 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) [2023-11-19 05:24:19,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:24:19,581 INFO L93 Difference]: Finished difference Result 132 states and 177 transitions. [2023-11-19 05:24:19,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-19 05:24:19,582 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 [2023-11-19 05:24:19,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:24:19,583 INFO L225 Difference]: With dead ends: 132 [2023-11-19 05:24:19,583 INFO L226 Difference]: Without dead ends: 132 [2023-11-19 05:24:19,584 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 493 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=226, Invalid=1671, Unknown=3, NotChecked=170, Total=2070 [2023-11-19 05:24:19,585 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 38 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 516 mSolverCounterSat, 61 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 302 SdHoareTripleChecker+Invalid, 808 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 516 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 228 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-19 05:24:19,585 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 302 Invalid, 808 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 516 Invalid, 3 Unknown, 228 Unchecked, 0.7s Time] [2023-11-19 05:24:19,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2023-11-19 05:24:19,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 122. [2023-11-19 05:24:19,591 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) [2023-11-19 05:24:19,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 165 transitions. [2023-11-19 05:24:19,592 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 165 transitions. Word has length 26 [2023-11-19 05:24:19,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:24:19,593 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 165 transitions. [2023-11-19 05:24:19,593 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) [2023-11-19 05:24:19,593 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 165 transitions. [2023-11-19 05:24:19,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-19 05:24:19,594 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:19,594 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] [2023-11-19 05:24:19,622 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-19 05:24:19,810 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-19 05:24:19,811 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)] === [2023-11-19 05:24:19,811 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:19,811 INFO L85 PathProgramCache]: Analyzing trace with hash -1118628323, now seen corresponding path program 1 times [2023-11-19 05:24:19,811 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:19,811 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716367086] [2023-11-19 05:24:19,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:19,812 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:19,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:20,517 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 05:24:20,517 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:24:20,517 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716367086] [2023-11-19 05:24:20,517 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [716367086] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:24:20,517 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2139929087] [2023-11-19 05:24:20,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:20,518 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:20,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:24:20,519 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:24:20,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:24:20,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:20,634 INFO L262 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 45 conjunts are in the unsatisfiable core [2023-11-19 05:24:20,640 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:24:20,655 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-19 05:24:20,658 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 [2023-11-19 05:24:20,782 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 [2023-11-19 05:24:20,829 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 [2023-11-19 05:24:20,849 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 [2023-11-19 05:24:20,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:24:20,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:24:20,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:24:20,906 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 [2023-11-19 05:24:20,925 INFO L349 Elim1Store]: treesize reduction 16, result has 36.0 percent of original size [2023-11-19 05:24:20,925 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 [2023-11-19 05:24:20,949 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 4 not checked. [2023-11-19 05:24:20,949 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:24:21,211 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2139929087] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:24:21,211 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1183715464] [2023-11-19 05:24:21,213 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-11-19 05:24:21,214 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:24:21,214 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:24:21,214 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:24:21,214 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:24:22,281 INFO L197 IcfgInterpreter]: Interpreting procedure create_internal with input of size 52 for LOIs [2023-11-19 05:24:23,395 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 53 for LOIs [2023-11-19 05:24:23,417 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-11-19 05:24:23,427 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:24:29,078 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$.base_154| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_154| |ULTIMATE.start_create_#t~ret10#1.base| (store (select |v_#memory_$Pointer$.base_154| |ULTIMATE.start_create_#t~ret10#1.base|) 0 0)) |#memory_$Pointer$.base|)) (not (= |ULTIMATE.start_create_~sll~1#1.base| 0)) (exists ((|v_#length_150| (Array Int Int))) (= (store |v_#length_150| |ULTIMATE.start_create_#t~ret10#1.base| 8) |#length|)) (not (= |ULTIMATE.start_create_#t~ret10#1.base| 0)) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (exists ((|v_#valid_174| (Array Int Int))) (and (= (select |v_#valid_174| |ULTIMATE.start_create_#t~ret10#1.base|) 0) (= |#valid| (store |v_#valid_174| |ULTIMATE.start_create_#t~ret10#1.base| 1)))) (exists ((|v_#memory_$Pointer$.offset_154| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_154| |ULTIMATE.start_create_#t~ret10#1.base| (store (select |v_#memory_$Pointer$.offset_154| |ULTIMATE.start_create_#t~ret10#1.base|) 0 0)))) (<= (+ |ULTIMATE.start_create_#t~ret10#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#valid_173| (Array Int Int))) (= (select |v_#valid_173| |ULTIMATE.start_create_~sll~1#1.base|) 0)) (= |ULTIMATE.start_create_~now~1#1.base| |ULTIMATE.start_create_~sll~1#1.base|)) (and (<= (+ |ULTIMATE.start_create_~sll~1#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#length_150| (Array Int Int)) (|v_#valid_174| (Array Int Int)) (|v_#memory_$Pointer$.offset_154| (Array Int (Array Int Int))) (v_create_internal_~now~0.base_35 Int) (v_create_internal_~now~0.offset_33 Int) (|v_#memory_$Pointer$.base_154| (Array Int (Array Int Int)))) (and (= 1 (select |#valid| v_create_internal_~now~0.base_35)) (= |#memory_$Pointer$.offset| (store (store |v_#memory_$Pointer$.offset_154| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33) (store (select |v_#memory_$Pointer$.offset_154| (select (select |#memory_$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$.offset_154| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33) (store (select |v_#memory_$Pointer$.offset_154| (select (select |#memory_$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$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33) 0)) (= (store (store |v_#memory_$Pointer$.base_154| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33) (store (select |v_#memory_$Pointer$.base_154| (select (select |#memory_$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$.base_154| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33) (store (select |v_#memory_$Pointer$.base_154| (select (select |#memory_$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$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33))) |#memory_$Pointer$.base|) (<= (+ (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33) 1) |#StackHeapBarrier|) (<= (+ v_create_internal_~now~0.offset_33 8) (select |#length| v_create_internal_~now~0.base_35)) (<= 0 v_create_internal_~now~0.offset_33) (= |#length| (store |v_#length_150| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33) 8)) (= 0 (select |v_#valid_174| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33))) (= (store |v_#valid_174| (select (select |#memory_$Pointer$.base| v_create_internal_~now~0.base_35) v_create_internal_~now~0.offset_33) 1) |#valid|))) (not (= |ULTIMATE.start_create_~sll~1#1.base| 0)) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (exists ((|v_#valid_173| (Array Int Int))) (= (select |v_#valid_173| |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 [2023-11-19 05:24:29,079 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:24:29,079 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:24:29,079 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 21 [2023-11-19 05:24:29,079 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129370189] [2023-11-19 05:24:29,079 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:24:29,080 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-19 05:24:29,080 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:24:29,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-19 05:24:29,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1477, Unknown=4, NotChecked=240, Total=1892 [2023-11-19 05:24:29,082 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) [2023-11-19 05:24:30,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:24:30,088 INFO L93 Difference]: Finished difference Result 138 states and 186 transitions. [2023-11-19 05:24:30,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-19 05:24:30,089 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 [2023-11-19 05:24:30,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:24:30,091 INFO L225 Difference]: With dead ends: 138 [2023-11-19 05:24:30,091 INFO L226 Difference]: Without dead ends: 138 [2023-11-19 05:24:30,092 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 585 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=220, Invalid=1857, Unknown=5, NotChecked=270, Total=2352 [2023-11-19 05:24:30,093 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 [2023-11-19 05:24:30,093 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] [2023-11-19 05:24:30,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2023-11-19 05:24:30,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 119. [2023-11-19 05:24:30,099 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) [2023-11-19 05:24:30,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 158 transitions. [2023-11-19 05:24:30,100 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 158 transitions. Word has length 26 [2023-11-19 05:24:30,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:24:30,101 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 158 transitions. [2023-11-19 05:24:30,101 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) [2023-11-19 05:24:30,101 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 158 transitions. [2023-11-19 05:24:30,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-19 05:24:30,102 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:30,102 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] [2023-11-19 05:24:30,130 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-11-19 05:24:30,314 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-19 05:24:30,315 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)] === [2023-11-19 05:24:30,315 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:30,315 INFO L85 PathProgramCache]: Analyzing trace with hash 1220096021, now seen corresponding path program 1 times [2023-11-19 05:24:30,315 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:30,315 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [352538908] [2023-11-19 05:24:30,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:30,315 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:30,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:30,736 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:24:30,736 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:24:30,736 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [352538908] [2023-11-19 05:24:30,736 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [352538908] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:24:30,736 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:24:30,736 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2023-11-19 05:24:30,737 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330563084] [2023-11-19 05:24:30,737 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:24:30,737 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-19 05:24:30,737 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:24:30,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-19 05:24:30,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2023-11-19 05:24:30,738 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) [2023-11-19 05:24:31,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:24:31,152 INFO L93 Difference]: Finished difference Result 142 states and 182 transitions. [2023-11-19 05:24:31,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-19 05:24:31,152 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 [2023-11-19 05:24:31,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:24:31,154 INFO L225 Difference]: With dead ends: 142 [2023-11-19 05:24:31,154 INFO L226 Difference]: Without dead ends: 142 [2023-11-19 05:24:31,154 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 [2023-11-19 05:24:31,155 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, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:24:31,156 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 459 Invalid, 568 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 567 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:24:31,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2023-11-19 05:24:31,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 129. [2023-11-19 05:24:31,168 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) [2023-11-19 05:24:31,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 174 transitions. [2023-11-19 05:24:31,170 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 174 transitions. Word has length 25 [2023-11-19 05:24:31,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:24:31,171 INFO L495 AbstractCegarLoop]: Abstraction has 129 states and 174 transitions. [2023-11-19 05:24:31,171 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) [2023-11-19 05:24:31,171 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 174 transitions. [2023-11-19 05:24:31,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-19 05:24:31,174 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:31,174 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] [2023-11-19 05:24:31,174 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-11-19 05:24:31,175 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)] === [2023-11-19 05:24:31,175 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:31,175 INFO L85 PathProgramCache]: Analyzing trace with hash 1220096022, now seen corresponding path program 1 times [2023-11-19 05:24:31,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:31,175 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [794640734] [2023-11-19 05:24:31,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:31,176 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:31,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:31,820 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:24:31,820 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:24:31,820 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [794640734] [2023-11-19 05:24:31,820 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [794640734] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:24:31,820 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:24:31,820 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2023-11-19 05:24:31,820 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684760840] [2023-11-19 05:24:31,821 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:24:31,821 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-19 05:24:31,821 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:24:31,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-19 05:24:31,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2023-11-19 05:24:31,822 INFO L87 Difference]: Start difference. First operand 129 states and 174 transitions. Second operand has 15 states, 10 states have (on average 1.9) internal successors, (19), 12 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) [2023-11-19 05:24:32,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:24:32,298 INFO L93 Difference]: Finished difference Result 141 states and 181 transitions. [2023-11-19 05:24:32,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-19 05:24:32,299 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 10 states have (on average 1.9) internal successors, (19), 12 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 [2023-11-19 05:24:32,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:24:32,300 INFO L225 Difference]: With dead ends: 141 [2023-11-19 05:24:32,300 INFO L226 Difference]: Without dead ends: 141 [2023-11-19 05:24:32,302 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=332, Unknown=0, NotChecked=0, Total=380 [2023-11-19 05:24:32,303 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 33 mSDsluCounter, 511 mSDsCounter, 0 mSdLazyCounter, 613 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 562 SdHoareTripleChecker+Invalid, 614 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 613 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-19 05:24:32,304 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 562 Invalid, 614 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 613 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-19 05:24:32,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2023-11-19 05:24:32,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 129. [2023-11-19 05:24:32,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 83 states have (on average 1.7228915662650603) internal successors, (143), 110 states have internal predecessors, (143), 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) [2023-11-19 05:24:32,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 173 transitions. [2023-11-19 05:24:32,312 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 173 transitions. Word has length 25 [2023-11-19 05:24:32,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:24:32,313 INFO L495 AbstractCegarLoop]: Abstraction has 129 states and 173 transitions. [2023-11-19 05:24:32,313 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 10 states have (on average 1.9) internal successors, (19), 12 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) [2023-11-19 05:24:32,313 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 173 transitions. [2023-11-19 05:24:32,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-19 05:24:32,314 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:32,314 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:24:32,314 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-11-19 05:24:32,315 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting create_internalErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-11-19 05:24:32,315 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:32,315 INFO L85 PathProgramCache]: Analyzing trace with hash -1218381947, now seen corresponding path program 1 times [2023-11-19 05:24:32,315 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:32,316 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1226953622] [2023-11-19 05:24:32,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:32,316 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:32,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:32,516 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:24:32,516 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:24:32,517 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1226953622] [2023-11-19 05:24:32,517 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1226953622] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:24:32,517 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [42622934] [2023-11-19 05:24:32,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:32,517 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:32,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:24:32,519 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:24:32,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:24:32,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:32,651 INFO L262 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-19 05:24:32,654 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:24:32,658 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 [2023-11-19 05:24:32,674 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 1 [2023-11-19 05:24:32,682 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2023-11-19 05:24:32,693 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 [2023-11-19 05:24:32,704 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-19 05:24:32,705 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 [2023-11-19 05:24:32,714 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 2 not checked. [2023-11-19 05:24:32,714 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:24:32,820 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 05:24:32,820 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [42622934] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:24:32,820 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [10901526] [2023-11-19 05:24:32,826 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-19 05:24:32,826 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:24:32,827 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:24:32,827 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:24:32,827 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:24:32,881 INFO L197 IcfgInterpreter]: Interpreting procedure create_internal with input of size 52 for LOIs [2023-11-19 05:24:34,037 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 53 for LOIs [2023-11-19 05:24:34,071 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-11-19 05:24:34,084 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:24:36,557 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4112#(and (= create_internal_~sll~0.offset 0) (exists ((|v_#valid_204| (Array Int Int))) (and (= (select |v_#valid_204| |create_internal_#t~ret7.base|) 0) (= (store |v_#valid_204| |create_internal_#t~ret7.base| 1) |#valid|))) (<= 1 |#StackHeapBarrier|) (exists ((|v_#length_174| (Array Int Int))) (= (store |v_#length_174| |create_internal_#t~ret7.base| 8) |#length|)) (exists ((|v_#memory_$Pointer$.offset_190| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_190| |create_internal_#t~ret7.base| (store (select |v_#memory_$Pointer$.offset_190| |create_internal_#t~ret7.base|) 0 0)))) (not (= (select |#valid| create_internal_~now~0.base) 1)) (not (= |create_internal_#t~ret7.base| 0)) (= |create_internal_#t~ret7.offset| 0) (<= (+ |create_internal_#t~ret7.base| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.base_191| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_191| |create_internal_#t~ret7.base| (store (select |v_#memory_$Pointer$.base_191| |create_internal_#t~ret7.base|) 0 0)))))' at error location [2023-11-19 05:24:36,557 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:24:36,557 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:24:36,557 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 7] total 11 [2023-11-19 05:24:36,557 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971029028] [2023-11-19 05:24:36,557 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:24:36,558 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-19 05:24:36,558 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:24:36,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-19 05:24:36,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=712, Unknown=1, NotChecked=54, Total=870 [2023-11-19 05:24:36,559 INFO L87 Difference]: Start difference. First operand 129 states and 173 transitions. Second operand has 12 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (6), 3 states have call predecessors, (6), 5 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-19 05:24:37,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:24:37,114 INFO L93 Difference]: Finished difference Result 128 states and 172 transitions. [2023-11-19 05:24:37,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:24:37,116 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (6), 3 states have call predecessors, (6), 5 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 28 [2023-11-19 05:24:37,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:24:37,117 INFO L225 Difference]: With dead ends: 128 [2023-11-19 05:24:37,117 INFO L226 Difference]: Without dead ends: 128 [2023-11-19 05:24:37,118 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 61 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=141, Invalid=1052, Unknown=1, NotChecked=66, Total=1260 [2023-11-19 05:24:37,119 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 23 mSDsluCounter, 310 mSDsCounter, 0 mSdLazyCounter, 476 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 372 SdHoareTripleChecker+Invalid, 579 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 476 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 91 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-19 05:24:37,119 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 372 Invalid, 579 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 476 Invalid, 0 Unknown, 91 Unchecked, 0.4s Time] [2023-11-19 05:24:37,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2023-11-19 05:24:37,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 128. [2023-11-19 05:24:37,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 83 states have (on average 1.7108433734939759) internal successors, (142), 109 states have internal predecessors, (142), 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) [2023-11-19 05:24:37,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 172 transitions. [2023-11-19 05:24:37,126 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 172 transitions. Word has length 28 [2023-11-19 05:24:37,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:24:37,126 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 172 transitions. [2023-11-19 05:24:37,127 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (6), 3 states have call predecessors, (6), 5 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-19 05:24:37,127 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 172 transitions. [2023-11-19 05:24:37,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-19 05:24:37,128 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:37,128 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:24:37,153 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-11-19 05:24:37,348 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:37,348 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting create_internalErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2023-11-19 05:24:37,349 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:37,349 INFO L85 PathProgramCache]: Analyzing trace with hash -1218381946, now seen corresponding path program 1 times [2023-11-19 05:24:37,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:37,349 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [939006852] [2023-11-19 05:24:37,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:37,349 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:37,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:37,796 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 05:24:37,796 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:24:37,796 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [939006852] [2023-11-19 05:24:37,796 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [939006852] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:24:37,796 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909452569] [2023-11-19 05:24:37,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:37,796 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:37,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:24:37,798 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:24:37,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64c956be-62e7-404c-af19-cc1c2579a137/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 05:24:37,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:37,931 INFO L262 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 31 conjunts are in the unsatisfiable core [2023-11-19 05:24:37,935 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:24:37,943 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 [2023-11-19 05:24:38,004 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 1 [2023-11-19 05:24:38,007 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 7 [2023-11-19 05:24:38,035 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2023-11-19 05:24:38,090 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 [2023-11-19 05:24:38,109 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-19 05:24:38,113 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 [2023-11-19 05:24:38,139 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 2 not checked. [2023-11-19 05:24:38,139 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:24:38,460 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 05:24:38,460 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1909452569] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:24:38,460 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [332860609] [2023-11-19 05:24:38,463 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-19 05:24:38,463 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:24:38,464 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:24:38,464 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:24:38,464 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:24:38,513 INFO L197 IcfgInterpreter]: Interpreting procedure create_internal with input of size 50 for LOIs