./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrlen_unsafe.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrlen_unsafe.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1fa4bda6bd30ba2cdf5e016e12b6593fa4b1ef45b4dc13eb01e28da7c534ab67 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:19:45,543 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:19:45,642 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-23 21:19:45,647 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:19:45,648 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:19:45,672 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:19:45,673 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:19:45,674 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:19:45,675 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:19:45,676 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:19:45,676 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:19:45,677 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:19:45,678 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:19:45,678 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:19:45,679 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:19:45,680 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:19:45,680 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:19:45,681 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:19:45,682 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:19:45,682 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:19:45,683 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:19:45,684 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:19:45,685 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-23 21:19:45,685 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-23 21:19:45,686 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:19:45,686 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:19:45,687 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:19:45,687 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:19:45,688 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:19:45,688 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-23 21:19:45,689 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-23 21:19:45,689 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-23 21:19:45,690 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:19:45,690 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-23 21:19:45,691 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-23 21:19:45,691 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:19:45,692 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:19:45,692 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:19:45,693 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:19:45,693 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:19:45,694 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:19:45,695 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:19:45,695 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:19:45,695 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:19:45,696 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:19:45,696 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:19:45,697 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:19:45,697 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:19:45,698 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_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1fa4bda6bd30ba2cdf5e016e12b6593fa4b1ef45b4dc13eb01e28da7c534ab67 [2023-11-23 21:19:46,002 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:19:46,038 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:19:46,040 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:19:46,042 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:19:46,046 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:19:46,048 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/array-memsafety/cstrlen_unsafe.i [2023-11-23 21:19:49,058 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:19:49,296 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:19:49,297 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/sv-benchmarks/c/array-memsafety/cstrlen_unsafe.i [2023-11-23 21:19:49,312 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/data/6fb80b211/cd09293a490546359c68c6938386dcba/FLAG8314c656a [2023-11-23 21:19:49,329 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/data/6fb80b211/cd09293a490546359c68c6938386dcba [2023-11-23 21:19:49,332 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:19:49,333 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:19:49,335 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:19:49,335 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:19:49,341 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:19:49,342 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:19:49" (1/1) ... [2023-11-23 21:19:49,343 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3afe862 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:49, skipping insertion in model container [2023-11-23 21:19:49,343 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:19:49" (1/1) ... [2023-11-23 21:19:49,389 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:19:49,750 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:19:49,760 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:19:49,802 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:19:49,833 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:19:49,833 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:49 WrapperNode [2023-11-23 21:19:49,833 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:19:49,834 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:19:49,835 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:19:49,835 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:19:49,843 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:49" (1/1) ... [2023-11-23 21:19:49,856 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:49" (1/1) ... [2023-11-23 21:19:49,889 INFO L138 Inliner]: procedures = 118, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 54 [2023-11-23 21:19:49,890 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:19:49,890 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:19:49,891 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:19:49,891 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:19:49,900 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:49" (1/1) ... [2023-11-23 21:19:49,901 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:49" (1/1) ... [2023-11-23 21:19:49,917 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:49" (1/1) ... [2023-11-23 21:19:49,918 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:49" (1/1) ... [2023-11-23 21:19:49,924 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:49" (1/1) ... [2023-11-23 21:19:49,936 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:49" (1/1) ... [2023-11-23 21:19:49,937 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:49" (1/1) ... [2023-11-23 21:19:49,938 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:49" (1/1) ... [2023-11-23 21:19:49,941 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:19:49,942 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:19:49,942 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:19:49,942 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:19:49,943 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:49" (1/1) ... [2023-11-23 21:19:49,955 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:19:49,971 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:49,984 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:19:50,017 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:19:50,033 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 21:19:50,033 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:19:50,033 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 21:19:50,034 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:19:50,034 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:19:50,034 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:19:50,197 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:19:50,199 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:19:50,390 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:19:50,490 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:19:50,490 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-23 21:19:50,491 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:19:50 BoogieIcfgContainer [2023-11-23 21:19:50,492 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:19:50,494 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:19:50,494 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:19:50,504 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:19:50,505 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:19:49" (1/3) ... [2023-11-23 21:19:50,506 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ce66d5d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:19:50, skipping insertion in model container [2023-11-23 21:19:50,506 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:49" (2/3) ... [2023-11-23 21:19:50,509 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ce66d5d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:19:50, skipping insertion in model container [2023-11-23 21:19:50,509 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:19:50" (3/3) ... [2023-11-23 21:19:50,510 INFO L112 eAbstractionObserver]: Analyzing ICFG cstrlen_unsafe.i [2023-11-23 21:19:50,526 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:19:50,527 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 10 error locations. [2023-11-23 21:19:50,582 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:19:50,590 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;@30a0d354, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:19:50,590 INFO L358 AbstractCegarLoop]: Starting to check reachability of 10 error locations. [2023-11-23 21:19:50,595 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 21 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:50,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-23 21:19:50,607 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:50,608 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-23 21:19:50,608 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 7 more)] === [2023-11-23 21:19:50,614 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:50,615 INFO L85 PathProgramCache]: Analyzing trace with hash 100490, now seen corresponding path program 1 times [2023-11-23 21:19:50,626 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:50,628 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [819909517] [2023-11-23 21:19:50,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:50,629 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:50,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:50,907 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:50,908 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:50,908 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [819909517] [2023-11-23 21:19:50,909 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [819909517] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:50,909 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:50,909 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-23 21:19:50,911 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110785215] [2023-11-23 21:19:50,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:50,916 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:19:50,917 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:50,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:19:50,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:19:50,947 INFO L87 Difference]: Start difference. First operand has 22 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 21 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:51,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:51,005 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2023-11-23 21:19:51,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:19:51,008 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-11-23 21:19:51,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:51,015 INFO L225 Difference]: With dead ends: 20 [2023-11-23 21:19:51,015 INFO L226 Difference]: Without dead ends: 19 [2023-11-23 21:19:51,017 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:19:51,020 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 4 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:51,022 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 20 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:19:51,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-23 21:19:51,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-11-23 21:19:51,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:51,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2023-11-23 21:19:51,052 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 3 [2023-11-23 21:19:51,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:51,052 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2023-11-23 21:19:51,053 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:51,053 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2023-11-23 21:19:51,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-23 21:19:51,053 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:51,054 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-23 21:19:51,054 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:19:51,054 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 7 more)] === [2023-11-23 21:19:51,055 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:51,055 INFO L85 PathProgramCache]: Analyzing trace with hash 100491, now seen corresponding path program 1 times [2023-11-23 21:19:51,055 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:51,055 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1489702315] [2023-11-23 21:19:51,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:51,056 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:51,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:51,430 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:51,431 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:51,431 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1489702315] [2023-11-23 21:19:51,432 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1489702315] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:51,432 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:51,433 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:19:51,433 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788003680] [2023-11-23 21:19:51,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:51,434 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:19:51,435 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:51,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:19:51,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:19:51,436 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:51,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:51,525 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2023-11-23 21:19:51,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:19:51,526 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-11-23 21:19:51,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:51,528 INFO L225 Difference]: With dead ends: 21 [2023-11-23 21:19:51,528 INFO L226 Difference]: Without dead ends: 21 [2023-11-23 21:19:51,534 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:19:51,536 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:51,537 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 34 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:19:51,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-23 21:19:51,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-11-23 21:19:51,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 20 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:51,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2023-11-23 21:19:51,548 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 3 [2023-11-23 21:19:51,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:51,549 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2023-11-23 21:19:51,549 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:51,549 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2023-11-23 21:19:51,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-23 21:19:51,550 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:51,550 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-23 21:19:51,550 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:19:51,551 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 7 more)] === [2023-11-23 21:19:51,551 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:51,552 INFO L85 PathProgramCache]: Analyzing trace with hash 102144, now seen corresponding path program 1 times [2023-11-23 21:19:51,552 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:51,552 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [769444376] [2023-11-23 21:19:51,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:51,554 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:51,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:51,897 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:51,898 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:51,898 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [769444376] [2023-11-23 21:19:51,899 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [769444376] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:51,899 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:51,899 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:19:51,899 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021379008] [2023-11-23 21:19:51,900 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:51,900 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:19:51,900 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:51,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:19:51,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:19:51,902 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:51,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:51,932 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2023-11-23 21:19:51,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:19:51,933 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-11-23 21:19:51,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:51,936 INFO L225 Difference]: With dead ends: 20 [2023-11-23 21:19:51,939 INFO L226 Difference]: Without dead ends: 20 [2023-11-23 21:19:51,940 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:19:51,944 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 6 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:51,945 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 22 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:19:51,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-23 21:19:51,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-23 21:19:51,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 19 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:51,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2023-11-23 21:19:51,951 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 3 [2023-11-23 21:19:51,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:51,955 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2023-11-23 21:19:51,956 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:51,956 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2023-11-23 21:19:51,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-23 21:19:51,956 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:51,956 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-23 21:19:51,957 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 21:19:51,957 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 7 more)] === [2023-11-23 21:19:51,957 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:51,958 INFO L85 PathProgramCache]: Analyzing trace with hash 3167650, now seen corresponding path program 1 times [2023-11-23 21:19:51,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:51,958 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [248226532] [2023-11-23 21:19:51,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:51,959 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:51,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:52,033 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:52,033 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:52,034 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [248226532] [2023-11-23 21:19:52,034 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [248226532] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:52,034 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:52,034 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:19:52,035 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683723791] [2023-11-23 21:19:52,035 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:52,035 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:19:52,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:52,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:19:52,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:19:52,037 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:52,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:52,060 INFO L93 Difference]: Finished difference Result 19 states and 21 transitions. [2023-11-23 21:19:52,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:19:52,061 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-23 21:19:52,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:52,062 INFO L225 Difference]: With dead ends: 19 [2023-11-23 21:19:52,062 INFO L226 Difference]: Without dead ends: 19 [2023-11-23 21:19:52,062 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:19:52,064 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 3 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:52,065 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 16 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:19:52,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-23 21:19:52,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-11-23 21:19:52,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:52,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2023-11-23 21:19:52,069 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 4 [2023-11-23 21:19:52,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:52,069 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2023-11-23 21:19:52,069 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:52,070 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2023-11-23 21:19:52,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-23 21:19:52,070 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:52,070 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-23 21:19:52,071 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 21:19:52,071 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 7 more)] === [2023-11-23 21:19:52,072 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:52,072 INFO L85 PathProgramCache]: Analyzing trace with hash 3167651, now seen corresponding path program 1 times [2023-11-23 21:19:52,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:52,072 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601607407] [2023-11-23 21:19:52,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:52,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:52,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:52,199 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:52,199 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:52,200 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601607407] [2023-11-23 21:19:52,200 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [601607407] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:52,200 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:52,200 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:19:52,200 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3479950] [2023-11-23 21:19:52,201 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:52,202 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:19:52,203 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:52,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:19:52,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:19:52,205 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:52,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:52,243 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2023-11-23 21:19:52,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:19:52,244 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-23 21:19:52,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:52,246 INFO L225 Difference]: With dead ends: 22 [2023-11-23 21:19:52,246 INFO L226 Difference]: Without dead ends: 22 [2023-11-23 21:19:52,247 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:19:52,248 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 5 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:52,249 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 28 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:19:52,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-23 21:19:52,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2023-11-23 21:19:52,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 19 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:52,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2023-11-23 21:19:52,258 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 4 [2023-11-23 21:19:52,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:52,259 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2023-11-23 21:19:52,259 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:52,259 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2023-11-23 21:19:52,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-23 21:19:52,260 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:52,260 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2023-11-23 21:19:52,260 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-23 21:19:52,260 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 7 more)] === [2023-11-23 21:19:52,262 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:52,262 INFO L85 PathProgramCache]: Analyzing trace with hash 96616604, now seen corresponding path program 1 times [2023-11-23 21:19:52,262 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:52,262 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922891910] [2023-11-23 21:19:52,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:52,263 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:52,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:52,576 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:52,577 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:52,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922891910] [2023-11-23 21:19:52,578 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922891910] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:19:52,578 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [7791224] [2023-11-23 21:19:52,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:52,579 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:52,579 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:52,584 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:19:52,608 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:19:52,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:52,658 INFO L262 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-23 21:19:52,663 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:19:52,794 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 7 [2023-11-23 21:19:52,992 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:52,992 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:19:53,146 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:53,147 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [7791224] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:19:53,147 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [490647347] [2023-11-23 21:19:53,166 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2023-11-23 21:19:53,166 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:19:53,170 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:19:53,176 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:19:53,176 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:19:53,503 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:19:53,619 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '281#(and (<= 0 |ULTIMATE.start_build_nondet_String_~i~0#1|) (<= 0 (+ |ULTIMATE.start_build_nondet_String_#t~nondet5#1| 128)) (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_build_nondet_String_~nondetString~0#1.base|) |ULTIMATE.start_build_nondet_String_~i~0#1|) (= |ULTIMATE.start_build_nondet_String_~nondetString~0#1.offset| 0) (<= |ULTIMATE.start_build_nondet_String_#t~nondet5#1| 127) (<= (+ |ULTIMATE.start_build_nondet_String_~i~0#1| 2) |ULTIMATE.start_build_nondet_String_~length~0#1|))' at error location [2023-11-23 21:19:53,619 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:19:53,619 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:19:53,620 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2023-11-23 21:19:53,620 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193580271] [2023-11-23 21:19:53,620 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:19:53,620 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 21:19:53,621 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:53,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 21:19:53,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2023-11-23 21:19:53,622 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:53,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:53,813 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2023-11-23 21:19:53,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:19:53,814 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-23 21:19:53,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:53,814 INFO L225 Difference]: With dead ends: 20 [2023-11-23 21:19:53,814 INFO L226 Difference]: Without dead ends: 20 [2023-11-23 21:19:53,815 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2023-11-23 21:19:53,816 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 2 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:53,816 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 65 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:19:53,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-23 21:19:53,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2023-11-23 21:19:53,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.5) internal successors, (18), 16 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:53,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2023-11-23 21:19:53,819 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 5 [2023-11-23 21:19:53,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:53,820 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2023-11-23 21:19:53,820 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:53,820 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2023-11-23 21:19:53,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-23 21:19:53,820 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:53,820 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-23 21:19:53,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:19:54,021 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:54,021 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 7 more)] === [2023-11-23 21:19:54,022 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:54,022 INFO L85 PathProgramCache]: Analyzing trace with hash -1250855172, now seen corresponding path program 1 times [2023-11-23 21:19:54,022 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:54,022 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20918468] [2023-11-23 21:19:54,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:54,023 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:54,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:54,217 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:54,218 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:54,218 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20918468] [2023-11-23 21:19:54,218 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [20918468] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:54,218 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:54,218 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 21:19:54,219 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010943359] [2023-11-23 21:19:54,219 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:54,219 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:19:54,219 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:54,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:19:54,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:19:54,221 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 6 states, 6 states have (on average 1.0) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:54,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:54,280 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2023-11-23 21:19:54,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:19:54,281 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.0) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-23 21:19:54,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:54,283 INFO L225 Difference]: With dead ends: 23 [2023-11-23 21:19:54,283 INFO L226 Difference]: Without dead ends: 23 [2023-11-23 21:19:54,284 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:19:54,285 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 3 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:54,285 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 43 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:19:54,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-23 21:19:54,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2023-11-23 21:19:54,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.4375) internal successors, (23), 20 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:54,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2023-11-23 21:19:54,293 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 6 [2023-11-23 21:19:54,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:54,293 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2023-11-23 21:19:54,294 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.0) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:54,294 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2023-11-23 21:19:54,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-23 21:19:54,294 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:54,294 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:54,295 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-23 21:19:54,295 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 7 more)] === [2023-11-23 21:19:54,295 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:54,295 INFO L85 PathProgramCache]: Analyzing trace with hash -121805670, now seen corresponding path program 1 times [2023-11-23 21:19:54,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:54,296 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [81020746] [2023-11-23 21:19:54,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:54,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:54,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:54,354 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:54,355 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:54,355 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [81020746] [2023-11-23 21:19:54,355 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [81020746] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:54,355 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:54,355 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:19:54,365 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512085051] [2023-11-23 21:19:54,365 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:54,365 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:19:54,366 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:54,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:19:54,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:19:54,367 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:54,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:54,381 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2023-11-23 21:19:54,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:19:54,382 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-23 21:19:54,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:54,382 INFO L225 Difference]: With dead ends: 20 [2023-11-23 21:19:54,382 INFO L226 Difference]: Without dead ends: 20 [2023-11-23 21:19:54,382 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:19:54,384 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 10 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:54,384 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 20 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:19:54,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-23 21:19:54,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-23 21:19:54,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.375) internal successors, (22), 19 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:54,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2023-11-23 21:19:54,388 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 7 [2023-11-23 21:19:54,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:54,388 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2023-11-23 21:19:54,388 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:54,388 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2023-11-23 21:19:54,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-23 21:19:54,389 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:54,389 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:54,389 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-23 21:19:54,389 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 7 more)] === [2023-11-23 21:19:54,390 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:54,390 INFO L85 PathProgramCache]: Analyzing trace with hash 727546187, now seen corresponding path program 1 times [2023-11-23 21:19:54,390 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:54,391 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294427486] [2023-11-23 21:19:54,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:54,391 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:54,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-11-23 21:19:54,413 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-11-23 21:19:54,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-11-23 21:19:54,446 INFO L130 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2023-11-23 21:19:54,446 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-11-23 21:19:54,447 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (9 of 10 remaining) [2023-11-23 21:19:54,449 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 10 remaining) [2023-11-23 21:19:54,449 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 10 remaining) [2023-11-23 21:19:54,450 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 10 remaining) [2023-11-23 21:19:54,450 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 10 remaining) [2023-11-23 21:19:54,450 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 10 remaining) [2023-11-23 21:19:54,450 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE (3 of 10 remaining) [2023-11-23 21:19:54,450 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE (2 of 10 remaining) [2023-11-23 21:19:54,451 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE (1 of 10 remaining) [2023-11-23 21:19:54,451 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK (0 of 10 remaining) [2023-11-23 21:19:54,451 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-23 21:19:54,454 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:54,458 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2023-11-23 21:19:54,474 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: Expected StepInfo for loop construct to contain Condition, but it did not [2023-11-23 21:19:54,477 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~mem6 could not be translated [2023-11-23 21:19:54,484 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.11 09:19:54 BoogieIcfgContainer [2023-11-23 21:19:54,484 INFO L131 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2023-11-23 21:19:54,484 INFO L112 PluginConnector]: ------------------------Witness Printer---------------------------- [2023-11-23 21:19:54,485 INFO L270 PluginConnector]: Initializing Witness Printer... [2023-11-23 21:19:54,485 INFO L274 PluginConnector]: Witness Printer initialized [2023-11-23 21:19:54,485 INFO L184 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:19:50" (3/4) ... [2023-11-23 21:19:54,486 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2023-11-23 21:19:54,490 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: Expected StepInfo for loop construct to contain Condition, but it did not [2023-11-23 21:19:54,491 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~mem6 could not be translated [2023-11-23 21:19:54,524 INFO L149 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/witness.graphml [2023-11-23 21:19:54,525 INFO L131 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2023-11-23 21:19:54,525 INFO L158 Benchmark]: Toolchain (without parser) took 5192.20ms. Allocated memory was 140.5MB in the beginning and 169.9MB in the end (delta: 29.4MB). Free memory was 93.5MB in the beginning and 127.9MB in the end (delta: -34.4MB). There was no memory consumed. Max. memory is 16.1GB. [2023-11-23 21:19:54,526 INFO L158 Benchmark]: CDTParser took 0.95ms. Allocated memory is still 109.1MB. Free memory is still 60.7MB. There was no memory consumed. Max. memory is 16.1GB. [2023-11-23 21:19:54,526 INFO L158 Benchmark]: CACSL2BoogieTranslator took 498.83ms. Allocated memory is still 140.5MB. Free memory was 93.5MB in the beginning and 76.8MB in the end (delta: 16.8MB). Peak memory consumption was 16.8MB. Max. memory is 16.1GB. [2023-11-23 21:19:54,527 INFO L158 Benchmark]: Boogie Procedure Inliner took 55.31ms. Allocated memory is still 140.5MB. Free memory was 76.8MB in the beginning and 75.1MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-11-23 21:19:54,527 INFO L158 Benchmark]: Boogie Preprocessor took 50.62ms. Allocated memory is still 140.5MB. Free memory was 75.1MB in the beginning and 73.5MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-11-23 21:19:54,527 INFO L158 Benchmark]: RCFGBuilder took 549.83ms. Allocated memory is still 140.5MB. Free memory was 73.5MB in the beginning and 101.6MB in the end (delta: -28.0MB). Peak memory consumption was 9.4MB. Max. memory is 16.1GB. [2023-11-23 21:19:54,528 INFO L158 Benchmark]: TraceAbstraction took 3989.80ms. Allocated memory was 140.5MB in the beginning and 169.9MB in the end (delta: 29.4MB). Free memory was 100.9MB in the beginning and 130.0MB in the end (delta: -29.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-11-23 21:19:54,528 INFO L158 Benchmark]: Witness Printer took 40.29ms. Allocated memory is still 169.9MB. Free memory was 130.0MB in the beginning and 127.9MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-11-23 21:19:54,531 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.95ms. Allocated memory is still 109.1MB. Free memory is still 60.7MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 498.83ms. Allocated memory is still 140.5MB. Free memory was 93.5MB in the beginning and 76.8MB in the end (delta: 16.8MB). Peak memory consumption was 16.8MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 55.31ms. Allocated memory is still 140.5MB. Free memory was 76.8MB in the beginning and 75.1MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 50.62ms. Allocated memory is still 140.5MB. Free memory was 75.1MB in the beginning and 73.5MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 549.83ms. Allocated memory is still 140.5MB. Free memory was 73.5MB in the beginning and 101.6MB in the end (delta: -28.0MB). Peak memory consumption was 9.4MB. Max. memory is 16.1GB. * TraceAbstraction took 3989.80ms. Allocated memory was 140.5MB in the beginning and 169.9MB in the end (delta: 29.4MB). Free memory was 100.9MB in the beginning and 130.0MB in the end (delta: -29.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Witness Printer took 40.29ms. Allocated memory is still 169.9MB. Free memory was 130.0MB in the beginning and 127.9MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Expected StepInfo for loop construct to contain Condition, but it did not - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~mem6 could not be translated - GenericResult: Unfinished Backtranslation The program execution was not completely translated back. - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Expected StepInfo for loop construct to contain Condition, but it did not - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~mem6 could not be translated - GenericResult: Unfinished Backtranslation The program execution was not completely translated back. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: -1]: pointer dereference may fail pointer dereference may fail We found a FailurePath: [L537] CALL, EXPR build_nondet_String() [L515] int length = __VERIFIER_nondet_int(); [L516] COND FALSE !(length < 1) [L519] char* nondetString = (char*) malloc(length * sizeof(char)); [L521] int i = 0; VAL [i=0, length=2, nondetString={-1:0}] [L521] COND TRUE i < length - 1 [L523] nondetString[i] = __VERIFIER_nondet_char() [L521] i++ VAL [i=1, length=2, nondetString={-1:0}] [L521] COND FALSE !(i < length - 1) [L526] nondetString[length-1] = '\0' [L527] return nondetString; [L537] RET, EXPR build_nondet_String() [L537] char* p = build_nondet_String(); [L538] CALL cstrlen(p) [L531] const char *p = s; VAL [p={-1:0}, s={-1:0}, s={-1:0}] [L532] EXPR \read(*p) VAL [p={-1:0}, s={-1:0}, s={-1:0}] [L532] COND TRUE *p != '\0' [L533] p = p+2 VAL [p={-1:2}, s={-1:0}, s={-1:0}] [L532] \read(*p) - UnprovableResult [Line: -1]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: -1]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: -1]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: -1]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: -1]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 539]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 539]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 539]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 536]: Unable to prove that all allocated memory was freed Unable to prove that all allocated memory was freed Reason: Not analyzed. - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 22 locations, 10 error locations. Started 1 CEGAR loops. OverallTime: 3.9s, OverallIterations: 9, TraceHistogramMax: 2, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 34 SdHoareTripleChecker+Valid, 0.3s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 34 mSDsluCounter, 248 SdHoareTripleChecker+Invalid, 0.3s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 159 mSDsCounter, 5 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 208 IncrementalHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 5 mSolverCounterUnsat, 89 mSDtfsCounter, 208 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 37 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22occurred in iteration=0, InterpolantAutomatonStates: 33, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 8 MinimizatonAttempts, 7 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 2.0s InterpolantComputationTime, 48 NumberOfCodeBlocks, 48 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 35 ConstructedInterpolants, 0 QuantifiedInterpolants, 500 SizeOfPredicates, 1 NumberOfNonLiveVariables, 40 ConjunctsInSsa, 12 ConjunctsInUnsatCore, 10 InterpolantComputations, 7 PerfectInterpolantSequences, 2/7 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2023-11-23 21:19:54,569 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_766252b7-d0e6-424a-b5f5-7a60d4900a59/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE(valid-deref)