./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/diff-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 4fc63b2a 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_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/diff-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2 --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 5cc33a4b6801f9f06dbbb17ff694aba4439c76c6a2b62ec290c2132cc01ea0fe --- Real Ultimate output --- This is Ultimate 0.2.5-dev-4fc63b2 [2024-11-02 12:32:16,746 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-02 12:32:16,844 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2024-11-02 12:32:16,850 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-02 12:32:16,852 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-02 12:32:16,891 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-02 12:32:16,892 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-02 12:32:16,892 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-02 12:32:16,893 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-02 12:32:16,894 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-02 12:32:16,895 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-02 12:32:16,895 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-02 12:32:16,896 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-02 12:32:16,896 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-02 12:32:16,896 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-02 12:32:16,898 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-02 12:32:16,899 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-02 12:32:16,899 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-02 12:32:16,900 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-02 12:32:16,900 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-02 12:32:16,904 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-02 12:32:16,905 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-02 12:32:16,905 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-11-02 12:32:16,905 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-11-02 12:32:16,906 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-02 12:32:16,906 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-02 12:32:16,906 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-02 12:32:16,906 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-02 12:32:16,907 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-02 12:32:16,907 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2024-11-02 12:32:16,907 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2024-11-02 12:32:16,907 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2024-11-02 12:32:16,908 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-02 12:32:16,910 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2024-11-02 12:32:16,910 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-02 12:32:16,911 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2024-11-02 12:32:16,911 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-02 12:32:16,912 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-02 12:32:16,912 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-02 12:32:16,913 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-02 12:32:16,913 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-02 12:32:16,913 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-02 12:32:16,914 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-02 12:32:16,914 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-02 12:32:16,914 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-02 12:32:16,915 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-02 12:32:16,915 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-02 12:32:16,915 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-02 12:32:16,916 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-02 12:32:16,916 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_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5cc33a4b6801f9f06dbbb17ff694aba4439c76c6a2b62ec290c2132cc01ea0fe [2024-11-02 12:32:17,197 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-02 12:32:17,229 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-02 12:32:17,232 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-02 12:32:17,234 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-02 12:32:17,235 INFO L274 PluginConnector]: CDTParser initialized [2024-11-02 12:32:17,236 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/../../sv-benchmarks/c/array-memsafety/diff-alloca-2.i Unable to find full path for "g++" [2024-11-02 12:32:19,371 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-02 12:32:19,600 INFO L384 CDTParser]: Found 1 translation units. [2024-11-02 12:32:19,601 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/sv-benchmarks/c/array-memsafety/diff-alloca-2.i [2024-11-02 12:32:19,616 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/data/354a2aeb7/49f988e25e0a423bab66593a44bafdab/FLAG7f3c74cd4 [2024-11-02 12:32:19,636 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/data/354a2aeb7/49f988e25e0a423bab66593a44bafdab [2024-11-02 12:32:19,639 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-02 12:32:19,641 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-02 12:32:19,644 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-02 12:32:19,645 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-02 12:32:19,651 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-02 12:32:19,652 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 12:32:19" (1/1) ... [2024-11-02 12:32:19,655 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@587a9501 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:32:19, skipping insertion in model container [2024-11-02 12:32:19,655 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 12:32:19" (1/1) ... [2024-11-02 12:32:19,711 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-02 12:32:20,128 WARN L1053 CHandler]: saw a pointer cast to a type that we could not get a type size for, not adapting memory model [2024-11-02 12:32:20,129 WARN L1053 CHandler]: saw a pointer cast to a type that we could not get a type size for, not adapting memory model [2024-11-02 12:32:20,130 WARN L1053 CHandler]: saw a pointer cast to a type that we could not get a type size for, not adapting memory model [2024-11-02 12:32:20,136 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-02 12:32:20,155 INFO L200 MainTranslator]: Completed pre-run [2024-11-02 12:32:20,207 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-02 12:32:20,240 INFO L204 MainTranslator]: Completed translation [2024-11-02 12:32:20,240 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:32:20 WrapperNode [2024-11-02 12:32:20,241 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-02 12:32:20,242 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-02 12:32:20,242 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-02 12:32:20,242 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-02 12:32:20,251 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:32:20" (1/1) ... [2024-11-02 12:32:20,268 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:32:20" (1/1) ... [2024-11-02 12:32:20,297 INFO L138 Inliner]: procedures = 116, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 105 [2024-11-02 12:32:20,300 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-02 12:32:20,300 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-02 12:32:20,301 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-02 12:32:20,301 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-02 12:32:20,311 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:32:20" (1/1) ... [2024-11-02 12:32:20,311 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:32:20" (1/1) ... [2024-11-02 12:32:20,314 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:32:20" (1/1) ... [2024-11-02 12:32:20,314 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:32:20" (1/1) ... [2024-11-02 12:32:20,328 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:32:20" (1/1) ... [2024-11-02 12:32:20,335 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:32:20" (1/1) ... [2024-11-02 12:32:20,337 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:32:20" (1/1) ... [2024-11-02 12:32:20,338 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:32:20" (1/1) ... [2024-11-02 12:32:20,344 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-02 12:32:20,345 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-02 12:32:20,345 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-02 12:32:20,345 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-02 12:32:20,346 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:32:20" (1/1) ... [2024-11-02 12:32:20,363 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-02 12:32:20,376 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:32:20,391 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-02 12:32:20,398 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-02 12:32:20,429 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2024-11-02 12:32:20,429 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2024-11-02 12:32:20,430 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2024-11-02 12:32:20,430 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2024-11-02 12:32:20,430 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-02 12:32:20,430 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-02 12:32:20,573 INFO L238 CfgBuilder]: Building ICFG [2024-11-02 12:32:20,575 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-02 12:32:20,928 INFO L? ?]: Removed 59 outVars from TransFormulas that were not future-live. [2024-11-02 12:32:20,929 INFO L287 CfgBuilder]: Performing block encoding [2024-11-02 12:32:21,041 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-02 12:32:21,041 INFO L316 CfgBuilder]: Removed 4 assume(true) statements. [2024-11-02 12:32:21,042 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 12:32:21 BoogieIcfgContainer [2024-11-02 12:32:21,043 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-02 12:32:21,046 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-02 12:32:21,047 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-02 12:32:21,050 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-02 12:32:21,051 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 12:32:19" (1/3) ... [2024-11-02 12:32:21,052 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c180ecb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 12:32:21, skipping insertion in model container [2024-11-02 12:32:21,052 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:32:20" (2/3) ... [2024-11-02 12:32:21,053 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c180ecb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 12:32:21, skipping insertion in model container [2024-11-02 12:32:21,054 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 12:32:21" (3/3) ... [2024-11-02 12:32:21,057 INFO L112 eAbstractionObserver]: Analyzing ICFG diff-alloca-2.i [2024-11-02 12:32:21,106 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:None NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-02 12:32:21,106 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 13 error locations. [2024-11-02 12:32:21,178 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-02 12:32:21,186 INFO L333 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, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=None, 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;@4d2c11d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-02 12:32:21,186 INFO L334 AbstractCegarLoop]: Starting to check reachability of 13 error locations. [2024-11-02 12:32:21,190 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 27 states have internal predecessors, (32), 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) [2024-11-02 12:32:21,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2024-11-02 12:32:21,197 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:32:21,198 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1] [2024-11-02 12:32:21,198 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2024-11-02 12:32:21,203 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:32:21,204 INFO L85 PathProgramCache]: Analyzing trace with hash 152576, now seen corresponding path program 1 times [2024-11-02 12:32:21,218 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:32:21,219 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [724646886] [2024-11-02 12:32:21,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:21,220 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:32:21,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:21,734 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 12:32:21,735 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:32:21,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [724646886] [2024-11-02 12:32:21,736 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [724646886] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:32:21,736 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 12:32:21,736 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2024-11-02 12:32:21,738 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487554993] [2024-11-02 12:32:21,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:32:21,745 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-02 12:32:21,745 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:32:21,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-02 12:32:21,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-02 12:32:21,780 INFO L87 Difference]: Start difference. First operand has 28 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 27 states have internal predecessors, (32), 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) [2024-11-02 12:32:21,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:32:21,840 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2024-11-02 12:32:21,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-02 12:32:21,844 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 [2024-11-02 12:32:21,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:32:21,854 INFO L225 Difference]: With dead ends: 27 [2024-11-02 12:32:21,854 INFO L226 Difference]: Without dead ends: 26 [2024-11-02 12:32:21,856 INFO L431 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 [2024-11-02 12:32:21,862 INFO L432 NwaCegarLoop]: 19 mSDtfsCounter, 6 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-02 12:32:21,863 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 28 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-02 12:32:21,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2024-11-02 12:32:21,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2024-11-02 12:32:21,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 14 states have (on average 2.142857142857143) internal successors, (30), 25 states have internal predecessors, (30), 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) [2024-11-02 12:32:21,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2024-11-02 12:32:21,892 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 3 [2024-11-02 12:32:21,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:32:21,893 INFO L471 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2024-11-02 12:32:21,893 INFO L472 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) [2024-11-02 12:32:21,893 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2024-11-02 12:32:21,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2024-11-02 12:32:21,893 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:32:21,894 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1] [2024-11-02 12:32:21,894 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-02 12:32:21,894 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2024-11-02 12:32:21,895 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:32:21,895 INFO L85 PathProgramCache]: Analyzing trace with hash 152577, now seen corresponding path program 1 times [2024-11-02 12:32:21,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:32:21,895 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233398837] [2024-11-02 12:32:21,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:21,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:32:21,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:22,362 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 12:32:22,363 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:32:22,363 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233398837] [2024-11-02 12:32:22,363 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1233398837] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:32:22,363 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 12:32:22,364 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-11-02 12:32:22,364 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170290014] [2024-11-02 12:32:22,364 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:32:22,365 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-11-02 12:32:22,365 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:32:22,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-11-02 12:32:22,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-02 12:32:22,367 INFO L87 Difference]: Start difference. First operand 26 states and 30 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) [2024-11-02 12:32:22,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:32:22,491 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2024-11-02 12:32:22,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-02 12:32:22,492 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 [2024-11-02 12:32:22,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:32:22,493 INFO L225 Difference]: With dead ends: 28 [2024-11-02 12:32:22,493 INFO L226 Difference]: Without dead ends: 28 [2024-11-02 12:32:22,494 INFO L431 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 [2024-11-02 12:32:22,495 INFO L432 NwaCegarLoop]: 20 mSDtfsCounter, 1 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 12:32:22,495 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 44 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 12:32:22,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2024-11-02 12:32:22,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2024-11-02 12:32:22,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 16 states have (on average 2.0625) internal successors, (33), 27 states have internal predecessors, (33), 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) [2024-11-02 12:32:22,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2024-11-02 12:32:22,500 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 3 [2024-11-02 12:32:22,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:32:22,501 INFO L471 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2024-11-02 12:32:22,501 INFO L472 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) [2024-11-02 12:32:22,501 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2024-11-02 12:32:22,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2024-11-02 12:32:22,501 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:32:22,502 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2024-11-02 12:32:22,502 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-11-02 12:32:22,502 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2024-11-02 12:32:22,503 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:32:22,503 INFO L85 PathProgramCache]: Analyzing trace with hash 4823612, now seen corresponding path program 1 times [2024-11-02 12:32:22,503 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:32:22,503 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1607341914] [2024-11-02 12:32:22,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:22,503 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:32:22,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:22,584 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 12:32:22,585 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:32:22,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1607341914] [2024-11-02 12:32:22,586 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1607341914] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:32:22,586 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 12:32:22,587 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2024-11-02 12:32:22,587 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527588543] [2024-11-02 12:32:22,587 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:32:22,587 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-02 12:32:22,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:32:22,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-02 12:32:22,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-02 12:32:22,590 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 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) [2024-11-02 12:32:22,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:32:22,640 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2024-11-02 12:32:22,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-02 12:32:22,642 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 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 [2024-11-02 12:32:22,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:32:22,643 INFO L225 Difference]: With dead ends: 27 [2024-11-02 12:32:22,643 INFO L226 Difference]: Without dead ends: 27 [2024-11-02 12:32:22,643 INFO L431 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 [2024-11-02 12:32:22,645 INFO L432 NwaCegarLoop]: 19 mSDtfsCounter, 4 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-02 12:32:22,648 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 28 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-02 12:32:22,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2024-11-02 12:32:22,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2024-11-02 12:32:22,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 16 states have (on average 2.0) internal successors, (32), 26 states have internal predecessors, (32), 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) [2024-11-02 12:32:22,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2024-11-02 12:32:22,655 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 4 [2024-11-02 12:32:22,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:32:22,655 INFO L471 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2024-11-02 12:32:22,655 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 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) [2024-11-02 12:32:22,656 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2024-11-02 12:32:22,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2024-11-02 12:32:22,657 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:32:22,657 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2024-11-02 12:32:22,657 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2024-11-02 12:32:22,658 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2024-11-02 12:32:22,658 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:32:22,659 INFO L85 PathProgramCache]: Analyzing trace with hash 4823613, now seen corresponding path program 1 times [2024-11-02 12:32:22,659 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:32:22,660 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [809504521] [2024-11-02 12:32:22,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:22,660 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:32:22,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:22,752 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 12:32:22,752 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:32:22,753 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [809504521] [2024-11-02 12:32:22,753 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [809504521] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:32:22,753 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 12:32:22,753 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-11-02 12:32:22,753 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284308468] [2024-11-02 12:32:22,754 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:32:22,754 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-02 12:32:22,754 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:32:22,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-02 12:32:22,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-02 12:32:22,756 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 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) [2024-11-02 12:32:22,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:32:22,804 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2024-11-02 12:32:22,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-02 12:32:22,805 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 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 [2024-11-02 12:32:22,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:32:22,806 INFO L225 Difference]: With dead ends: 27 [2024-11-02 12:32:22,806 INFO L226 Difference]: Without dead ends: 27 [2024-11-02 12:32:22,806 INFO L431 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 [2024-11-02 12:32:22,807 INFO L432 NwaCegarLoop]: 19 mSDtfsCounter, 1 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 37 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 [2024-11-02 12:32:22,808 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 37 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-02 12:32:22,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2024-11-02 12:32:22,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2024-11-02 12:32:22,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 16 states have (on average 1.9375) internal successors, (31), 26 states have internal predecessors, (31), 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) [2024-11-02 12:32:22,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2024-11-02 12:32:22,814 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 4 [2024-11-02 12:32:22,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:32:22,815 INFO L471 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2024-11-02 12:32:22,815 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 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) [2024-11-02 12:32:22,815 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2024-11-02 12:32:22,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2024-11-02 12:32:22,816 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:32:22,816 INFO L215 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2024-11-02 12:32:22,816 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2024-11-02 12:32:22,817 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2024-11-02 12:32:22,817 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:32:22,817 INFO L85 PathProgramCache]: Analyzing trace with hash 146710843, now seen corresponding path program 1 times [2024-11-02 12:32:22,818 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:32:22,818 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1511912227] [2024-11-02 12:32:22,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:22,819 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:32:22,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:23,309 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 12:32:23,311 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:32:23,312 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1511912227] [2024-11-02 12:32:23,312 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1511912227] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:32:23,312 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1887936765] [2024-11-02 12:32:23,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:23,313 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:32:23,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:32:23,317 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:32:23,318 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-02 12:32:23,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:23,420 INFO L255 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 23 conjuncts are in the unsatisfiable core [2024-11-02 12:32:23,428 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:32:23,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-11-02 12:32:23,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-11-02 12:32:23,630 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 9 [2024-11-02 12:32:23,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-11-02 12:32:23,649 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2024-11-02 12:32:23,842 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 12:32:23,843 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:32:24,010 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 12:32:24,010 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1887936765] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 12:32:24,011 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [580878666] [2024-11-02 12:32:24,035 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2024-11-02 12:32:24,035 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 12:32:24,040 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 12:32:24,045 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 12:32:24,046 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 12:32:25,424 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 12:32:27,694 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '298#(and (= |ULTIMATE.start_main_~B~0#1.offset| 0) (= |ULTIMATE.start_main_~D~0#1.offset| 0) (exists ((|v_ULTIMATE.start_main_~A~0#1.base_26| Int) (|v_ULTIMATE.start_main_~i~1#1_41| Int)) (and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_#t~nondet13#1| 2147483647) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet13#1|)) (<= 2 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= 2 |ULTIMATE.start_main_~B~0#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_main_~D~0#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= 2 |v_ULTIMATE.start_main_~A~0#1.base_26|) (<= 0 |v_ULTIMATE.start_main_~i~1#1_41|) (<= 1 |ULTIMATE.start_main_~Alen~0#1|) (<= (select |#length| |v_ULTIMATE.start_main_~A~0#1.base_26|) (+ 3 (* |v_ULTIMATE.start_main_~i~1#1_41| 4))))))' at error location [2024-11-02 12:32:27,694 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 12:32:27,695 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 12:32:27,695 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2024-11-02 12:32:27,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349423737] [2024-11-02 12:32:27,695 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 12:32:27,696 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2024-11-02 12:32:27,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:32:27,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2024-11-02 12:32:27,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=139, Unknown=1, NotChecked=0, Total=182 [2024-11-02 12:32:27,699 INFO L87 Difference]: Start difference. First operand 27 states and 31 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) [2024-11-02 12:32:27,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:32:27,951 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2024-11-02 12:32:27,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-11-02 12:32:27,952 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 [2024-11-02 12:32:27,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:32:27,953 INFO L225 Difference]: With dead ends: 28 [2024-11-02 12:32:27,953 INFO L226 Difference]: Without dead ends: 28 [2024-11-02 12:32:27,953 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=59, Invalid=180, Unknown=1, NotChecked=0, Total=240 [2024-11-02 12:32:27,954 INFO L432 NwaCegarLoop]: 18 mSDtfsCounter, 2 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-02 12:32:27,955 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 84 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-02 12:32:27,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2024-11-02 12:32:27,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 25. [2024-11-02 12:32:27,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 24 states have internal predecessors, (29), 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) [2024-11-02 12:32:27,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2024-11-02 12:32:27,958 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 5 [2024-11-02 12:32:27,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:32:27,959 INFO L471 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2024-11-02 12:32:27,959 INFO L472 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) [2024-11-02 12:32:27,959 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2024-11-02 12:32:27,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2024-11-02 12:32:27,960 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:32:27,960 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2024-11-02 12:32:27,980 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2024-11-02 12:32:28,160 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:32:28,161 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2024-11-02 12:32:28,162 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:32:28,162 INFO L85 PathProgramCache]: Analyzing trace with hash 253162563, now seen corresponding path program 1 times [2024-11-02 12:32:28,162 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:32:28,162 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [138874828] [2024-11-02 12:32:28,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:28,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:32:28,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:28,482 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:32:28,482 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:32:28,482 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [138874828] [2024-11-02 12:32:28,482 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [138874828] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:32:28,483 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 12:32:28,483 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2024-11-02 12:32:28,483 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268885148] [2024-11-02 12:32:28,483 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:32:28,483 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-02 12:32:28,484 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:32:28,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-02 12:32:28,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2024-11-02 12:32:28,485 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 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) [2024-11-02 12:32:28,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:32:28,606 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2024-11-02 12:32:28,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-02 12:32:28,607 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 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 [2024-11-02 12:32:28,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:32:28,608 INFO L225 Difference]: With dead ends: 27 [2024-11-02 12:32:28,608 INFO L226 Difference]: Without dead ends: 27 [2024-11-02 12:32:28,609 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2024-11-02 12:32:28,610 INFO L432 NwaCegarLoop]: 17 mSDtfsCounter, 4 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 12:32:28,610 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 49 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 12:32:28,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2024-11-02 12:32:28,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2024-11-02 12:32:28,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 26 states have internal predecessors, (32), 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) [2024-11-02 12:32:28,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2024-11-02 12:32:28,614 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 6 [2024-11-02 12:32:28,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:32:28,614 INFO L471 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2024-11-02 12:32:28,615 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 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) [2024-11-02 12:32:28,615 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2024-11-02 12:32:28,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2024-11-02 12:32:28,615 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:32:28,615 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:32:28,616 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2024-11-02 12:32:28,616 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2024-11-02 12:32:28,616 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:32:28,617 INFO L85 PathProgramCache]: Analyzing trace with hash -741814714, now seen corresponding path program 1 times [2024-11-02 12:32:28,617 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:32:28,617 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905913234] [2024-11-02 12:32:28,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:28,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:32:28,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:28,720 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 12:32:28,720 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:32:28,720 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905913234] [2024-11-02 12:32:28,720 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [905913234] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:32:28,721 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351761316] [2024-11-02 12:32:28,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:28,721 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:32:28,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:32:28,723 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:32:28,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-02 12:32:28,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:28,819 INFO L255 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 5 conjuncts are in the unsatisfiable core [2024-11-02 12:32:28,821 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:32:28,862 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 12:32:28,862 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:32:28,904 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 12:32:28,904 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1351761316] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 12:32:28,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [571751038] [2024-11-02 12:32:28,906 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2024-11-02 12:32:28,906 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 12:32:28,907 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 12:32:28,909 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 12:32:28,909 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 12:32:30,442 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 12:32:30,787 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '464#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_#valid_55| (Array Int Int)) (|v_ULTIMATE.start_main_#t~malloc10#1.base_22| Int) (|v_ULTIMATE.start_main_#t~malloc11#1.base_22| Int) (|v_ULTIMATE.start_main_#t~malloc12#1.base_22| Int)) (and (<= 2 |v_ULTIMATE.start_main_#t~malloc11#1.base_22|) (= |#valid| (store (store (store |v_#valid_55| |v_ULTIMATE.start_main_#t~malloc10#1.base_22| 0) |v_ULTIMATE.start_main_#t~malloc11#1.base_22| 0) |v_ULTIMATE.start_main_#t~malloc12#1.base_22| 0)) (<= 2 |v_ULTIMATE.start_main_#t~malloc12#1.base_22|) (<= 2 |v_ULTIMATE.start_main_#t~malloc10#1.base_22|))) (exists ((|v_ULTIMATE.start_main_old_#valid#1_16| (Array Int Int))) (not (= |v_ULTIMATE.start_main_old_#valid#1_16| |#valid|))) (= |ULTIMATE.start_main_#res#1| 0))' at error location [2024-11-02 12:32:30,788 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 12:32:30,788 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 12:32:30,788 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2024-11-02 12:32:30,788 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563425266] [2024-11-02 12:32:30,788 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 12:32:30,789 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2024-11-02 12:32:30,789 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:32:30,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2024-11-02 12:32:30,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=170, Unknown=1, NotChecked=0, Total=210 [2024-11-02 12:32:30,790 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 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) [2024-11-02 12:32:30,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:32:30,902 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2024-11-02 12:32:30,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-11-02 12:32:30,903 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 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 [2024-11-02 12:32:30,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:32:30,904 INFO L225 Difference]: With dead ends: 42 [2024-11-02 12:32:30,904 INFO L226 Difference]: Without dead ends: 42 [2024-11-02 12:32:30,904 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 9 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=45, Invalid=194, Unknown=1, NotChecked=0, Total=240 [2024-11-02 12:32:30,905 INFO L432 NwaCegarLoop]: 12 mSDtfsCounter, 33 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 12:32:30,905 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 58 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 12:32:30,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2024-11-02 12:32:30,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 28. [2024-11-02 12:32:30,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 27 states have internal predecessors, (33), 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) [2024-11-02 12:32:30,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2024-11-02 12:32:30,910 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 7 [2024-11-02 12:32:30,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:32:30,910 INFO L471 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2024-11-02 12:32:30,910 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 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) [2024-11-02 12:32:30,911 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2024-11-02 12:32:30,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2024-11-02 12:32:30,913 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:32:30,913 INFO L215 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2024-11-02 12:32:30,934 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2024-11-02 12:32:31,117 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2024-11-02 12:32:31,118 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2024-11-02 12:32:31,118 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:32:31,118 INFO L85 PathProgramCache]: Analyzing trace with hash -1523847127, now seen corresponding path program 1 times [2024-11-02 12:32:31,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:32:31,119 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1682284566] [2024-11-02 12:32:31,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:31,119 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:32:31,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:31,522 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:32:31,522 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:32:31,522 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1682284566] [2024-11-02 12:32:31,523 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1682284566] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:32:31,523 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1471309589] [2024-11-02 12:32:31,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:31,523 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:32:31,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:32:31,525 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:32:31,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-02 12:32:31,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:31,613 INFO L255 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 19 conjuncts are in the unsatisfiable core [2024-11-02 12:32:31,615 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:32:31,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-11-02 12:32:31,654 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 9 [2024-11-02 12:32:31,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-11-02 12:32:31,665 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2024-11-02 12:32:31,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-11-02 12:32:31,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-11-02 12:32:31,686 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-02 12:32:31,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-11-02 12:32:31,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-11-02 12:32:31,701 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-02 12:32:31,946 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:32:31,946 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:32:32,188 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:32:32,189 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1471309589] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 12:32:32,189 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [684354804] [2024-11-02 12:32:32,191 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2024-11-02 12:32:32,191 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 12:32:32,192 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 12:32:32,192 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 12:32:32,192 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 12:32:33,234 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 12:32:33,614 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '598#(and (= |ULTIMATE.start_main_~D~0#1.offset| 0) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet15#1|)) (= |ULTIMATE.start_main_~A~0#1.offset| 0) (exists ((|v_ULTIMATE.start_main_~i~2#1_41| Int) (|v_ULTIMATE.start_main_~B~0#1.base_29| Int)) (and (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= (+ |v_ULTIMATE.start_main_~i~2#1_41| 1) |ULTIMATE.start_main_~Blen~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |v_ULTIMATE.start_main_~B~0#1.base_29|) (<= 2 |ULTIMATE.start_main_~D~0#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= (select |#length| |v_ULTIMATE.start_main_~B~0#1.base_29|) (+ (* |v_ULTIMATE.start_main_~i~2#1_41| 4) 3)) (<= 2 |ULTIMATE.start_main_~A~0#1.base|) (<= 0 |v_ULTIMATE.start_main_~i~2#1_41|))) (<= |ULTIMATE.start_main_#t~nondet15#1| 2147483647))' at error location [2024-11-02 12:32:33,614 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 12:32:33,614 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 12:32:33,614 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2024-11-02 12:32:33,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407203564] [2024-11-02 12:32:33,615 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 12:32:33,615 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2024-11-02 12:32:33,616 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:32:33,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2024-11-02 12:32:33,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2024-11-02 12:32:33,617 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 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) [2024-11-02 12:32:33,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:32:33,866 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2024-11-02 12:32:33,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-11-02 12:32:33,868 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 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) Word has length 8 [2024-11-02 12:32:33,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:32:33,869 INFO L225 Difference]: With dead ends: 27 [2024-11-02 12:32:33,869 INFO L226 Difference]: Without dead ends: 27 [2024-11-02 12:32:33,869 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2024-11-02 12:32:33,872 INFO L432 NwaCegarLoop]: 17 mSDtfsCounter, 3 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-02 12:32:33,872 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 114 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-02 12:32:33,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2024-11-02 12:32:33,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2024-11-02 12:32:33,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 25 states have internal predecessors, (30), 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) [2024-11-02 12:32:33,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2024-11-02 12:32:33,877 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 8 [2024-11-02 12:32:33,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:32:33,877 INFO L471 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2024-11-02 12:32:33,877 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 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) [2024-11-02 12:32:33,877 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2024-11-02 12:32:33,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2024-11-02 12:32:33,878 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:32:33,878 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:32:33,899 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2024-11-02 12:32:34,079 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:32:34,079 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2024-11-02 12:32:34,080 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:32:34,080 INFO L85 PathProgramCache]: Analyzing trace with hash 169189546, now seen corresponding path program 1 times [2024-11-02 12:32:34,080 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:32:34,080 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1480564985] [2024-11-02 12:32:34,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:34,080 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:32:34,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:34,132 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:32:34,132 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:32:34,132 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1480564985] [2024-11-02 12:32:34,132 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1480564985] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:32:34,132 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 12:32:34,132 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2024-11-02 12:32:34,133 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504703206] [2024-11-02 12:32:34,133 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:32:34,133 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-11-02 12:32:34,133 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:32:34,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-11-02 12:32:34,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-02 12:32:34,134 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 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) [2024-11-02 12:32:34,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:32:34,183 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2024-11-02 12:32:34,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-02 12:32:34,184 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 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 10 [2024-11-02 12:32:34,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:32:34,185 INFO L225 Difference]: With dead ends: 24 [2024-11-02 12:32:34,185 INFO L226 Difference]: Without dead ends: 24 [2024-11-02 12:32:34,185 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-02 12:32:34,186 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 13 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-02 12:32:34,186 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 19 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-02 12:32:34,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2024-11-02 12:32:34,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2024-11-02 12:32:34,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 23 states have internal predecessors, (28), 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) [2024-11-02 12:32:34,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2024-11-02 12:32:34,189 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 10 [2024-11-02 12:32:34,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:32:34,189 INFO L471 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2024-11-02 12:32:34,189 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 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) [2024-11-02 12:32:34,189 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2024-11-02 12:32:34,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2024-11-02 12:32:34,190 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:32:34,190 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:32:34,190 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2024-11-02 12:32:34,190 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2024-11-02 12:32:34,190 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:32:34,190 INFO L85 PathProgramCache]: Analyzing trace with hash 169189547, now seen corresponding path program 1 times [2024-11-02 12:32:34,191 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:32:34,191 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373647088] [2024-11-02 12:32:34,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:34,191 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:32:34,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:34,306 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:32:34,306 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:32:34,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373647088] [2024-11-02 12:32:34,306 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [373647088] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:32:34,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [807435971] [2024-11-02 12:32:34,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:34,307 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:32:34,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:32:34,309 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:32:34,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-02 12:32:34,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:34,399 INFO L255 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 12 conjuncts are in the unsatisfiable core [2024-11-02 12:32:34,401 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:32:34,491 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:32:34,492 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:32:34,560 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2024-11-02 12:32:34,572 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:32:34,572 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [807435971] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 12:32:34,573 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [707973832] [2024-11-02 12:32:34,574 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2024-11-02 12:32:34,575 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 12:32:34,575 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 12:32:34,575 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 12:32:34,576 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 12:32:35,551 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 12:32:36,365 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '773#(and (<= 1 |ULTIMATE.start_diff_~l1~0#1|) (= |ULTIMATE.start_diff_~k~0#1| 0) (<= 1 |ULTIMATE.start_diff_~l2~0#1|) (= |ULTIMATE.start_diff_~found~0#1| 0) (= |ULTIMATE.start_diff_~j~0#1| 0) (exists ((|v_ULTIMATE.start_diff_~A#1.offset_16| Int) (|v_ULTIMATE.start_main_~i~2#1_47| Int) (|v_ULTIMATE.start_diff_~A#1.base_18| Int)) (and (= |ULTIMATE.start_diff_~B#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_diff_~l2~0#1| |v_ULTIMATE.start_main_~i~2#1_47|) (<= 2 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (= |ULTIMATE.start_diff_~D#1.offset| 0) (<= 2 |ULTIMATE.start_diff_~B#1.base|) (<= 2 |v_ULTIMATE.start_diff_~A#1.base_18|) (<= 2 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= (select |#length| |v_ULTIMATE.start_diff_~A#1.base_18|) 3) (<= 2 |ULTIMATE.start_diff_~D#1.base|) (= |v_ULTIMATE.start_diff_~A#1.offset_16| 0))))' at error location [2024-11-02 12:32:36,365 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 12:32:36,366 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 12:32:36,366 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2024-11-02 12:32:36,366 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103938705] [2024-11-02 12:32:36,366 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 12:32:36,367 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2024-11-02 12:32:36,367 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:32:36,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2024-11-02 12:32:36,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2024-11-02 12:32:36,368 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 9 states, 8 states have (on average 3.0) internal successors, (24), 8 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) [2024-11-02 12:32:36,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:32:36,516 INFO L93 Difference]: Finished difference Result 41 states and 49 transitions. [2024-11-02 12:32:36,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-11-02 12:32:36,517 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.0) internal successors, (24), 8 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) Word has length 10 [2024-11-02 12:32:36,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:32:36,518 INFO L225 Difference]: With dead ends: 41 [2024-11-02 12:32:36,518 INFO L226 Difference]: Without dead ends: 41 [2024-11-02 12:32:36,518 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2024-11-02 12:32:36,519 INFO L432 NwaCegarLoop]: 9 mSDtfsCounter, 36 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 12:32:36,519 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 48 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 12:32:36,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2024-11-02 12:32:36,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 28. [2024-11-02 12:32:36,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 21 states have (on average 1.619047619047619) internal successors, (34), 27 states have internal predecessors, (34), 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) [2024-11-02 12:32:36,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2024-11-02 12:32:36,522 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 10 [2024-11-02 12:32:36,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:32:36,523 INFO L471 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2024-11-02 12:32:36,523 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.0) internal successors, (24), 8 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) [2024-11-02 12:32:36,523 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2024-11-02 12:32:36,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2024-11-02 12:32:36,524 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:32:36,524 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:32:36,547 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2024-11-02 12:32:36,724 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:32:36,724 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2024-11-02 12:32:36,725 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:32:36,725 INFO L85 PathProgramCache]: Analyzing trace with hash 949908673, now seen corresponding path program 1 times [2024-11-02 12:32:36,725 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:32:36,725 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [979063663] [2024-11-02 12:32:36,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:36,726 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:32:36,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:36,774 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:32:36,774 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:32:36,774 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [979063663] [2024-11-02 12:32:36,774 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [979063663] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:32:36,774 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 12:32:36,774 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2024-11-02 12:32:36,774 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629012982] [2024-11-02 12:32:36,775 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:32:36,775 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-11-02 12:32:36,775 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:32:36,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-11-02 12:32:36,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-02 12:32:36,776 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 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) [2024-11-02 12:32:36,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:32:36,815 INFO L93 Difference]: Finished difference Result 27 states and 33 transitions. [2024-11-02 12:32:36,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-02 12:32:36,816 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 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 11 [2024-11-02 12:32:36,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:32:36,816 INFO L225 Difference]: With dead ends: 27 [2024-11-02 12:32:36,816 INFO L226 Difference]: Without dead ends: 27 [2024-11-02 12:32:36,817 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-02 12:32:36,817 INFO L432 NwaCegarLoop]: 11 mSDtfsCounter, 15 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-02 12:32:36,818 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 21 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-02 12:32:36,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2024-11-02 12:32:36,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2024-11-02 12:32:36,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 26 states have internal predecessors, (33), 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) [2024-11-02 12:32:36,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2024-11-02 12:32:36,820 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 11 [2024-11-02 12:32:36,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:32:36,820 INFO L471 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2024-11-02 12:32:36,821 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 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) [2024-11-02 12:32:36,821 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2024-11-02 12:32:36,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2024-11-02 12:32:36,821 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:32:36,821 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:32:36,821 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2024-11-02 12:32:36,822 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2024-11-02 12:32:36,822 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:32:36,822 INFO L85 PathProgramCache]: Analyzing trace with hash 949908674, now seen corresponding path program 1 times [2024-11-02 12:32:36,822 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:32:36,822 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1941204862] [2024-11-02 12:32:36,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:36,823 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:32:36,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:36,952 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:32:36,953 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:32:36,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1941204862] [2024-11-02 12:32:36,953 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1941204862] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:32:36,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1015565246] [2024-11-02 12:32:36,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:36,953 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:32:36,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:32:36,955 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:32:36,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-02 12:32:37,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:37,038 INFO L255 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 12 conjuncts are in the unsatisfiable core [2024-11-02 12:32:37,039 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:32:37,100 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:32:37,100 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:32:37,148 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2024-11-02 12:32:37,169 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:32:37,169 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1015565246] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 12:32:37,169 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1358131898] [2024-11-02 12:32:37,171 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-02 12:32:37,171 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 12:32:37,171 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 12:32:37,172 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 12:32:37,172 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 12:32:38,099 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 12:32:38,855 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '981#(and (<= 1 |ULTIMATE.start_diff_~l1~0#1|) (= |ULTIMATE.start_diff_~k~0#1| 0) (<= 1 |ULTIMATE.start_diff_~l2~0#1|) (= |ULTIMATE.start_diff_~found~0#1| 0) (<= 4 (select |#length| |ULTIMATE.start_diff_~A#1.base|)) (= |ULTIMATE.start_diff_~D#1.offset| 0) (exists ((|v_ULTIMATE.start_main_~i~2#1_53| Int) (|v_ULTIMATE.start_diff_~B#1.base_18| Int)) (and (<= 2 |v_ULTIMATE.start_diff_~B#1.base_18|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= |ULTIMATE.start_diff_~l2~0#1| |v_ULTIMATE.start_main_~i~2#1_53|) (<= 2 |ULTIMATE.start_diff_~A#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc11#1.base|) (<= (select |#length| |v_ULTIMATE.start_diff_~B#1.base_18|) 3) (<= 2 |ULTIMATE.start_diff_~D#1.base|))) (= (select |#valid| |ULTIMATE.start_diff_~A#1.base|) 1) (= |ULTIMATE.start_diff_~i~0#1| 0) (= |ULTIMATE.start_diff_~A#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_diff_~A#1.base|) 0) |ULTIMATE.start_diff_#t~mem2#1|))' at error location [2024-11-02 12:32:38,855 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 12:32:38,856 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 12:32:38,856 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 7 [2024-11-02 12:32:38,856 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118501816] [2024-11-02 12:32:38,856 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 12:32:38,856 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2024-11-02 12:32:38,857 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:32:38,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2024-11-02 12:32:38,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2024-11-02 12:32:38,858 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 9 states, 8 states have (on average 2.25) internal successors, (18), 8 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) [2024-11-02 12:32:39,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:32:39,046 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2024-11-02 12:32:39,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-11-02 12:32:39,047 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.25) internal successors, (18), 8 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) Word has length 11 [2024-11-02 12:32:39,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:32:39,048 INFO L225 Difference]: With dead ends: 31 [2024-11-02 12:32:39,048 INFO L226 Difference]: Without dead ends: 31 [2024-11-02 12:32:39,048 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2024-11-02 12:32:39,049 INFO L432 NwaCegarLoop]: 7 mSDtfsCounter, 22 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 12:32:39,049 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 33 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 12:32:39,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2024-11-02 12:32:39,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2024-11-02 12:32:39,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 29 states have internal predecessors, (37), 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) [2024-11-02 12:32:39,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2024-11-02 12:32:39,056 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 11 [2024-11-02 12:32:39,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:32:39,057 INFO L471 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2024-11-02 12:32:39,057 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.25) internal successors, (18), 8 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) [2024-11-02 12:32:39,057 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2024-11-02 12:32:39,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2024-11-02 12:32:39,057 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:32:39,057 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:32:39,081 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2024-11-02 12:32:39,258 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:32:39,258 INFO L396 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2024-11-02 12:32:39,259 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:32:39,259 INFO L85 PathProgramCache]: Analyzing trace with hash -616185169, now seen corresponding path program 1 times [2024-11-02 12:32:39,259 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:32:39,259 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853934228] [2024-11-02 12:32:39,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:39,259 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:32:39,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:39,365 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2024-11-02 12:32:39,365 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:32:39,365 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853934228] [2024-11-02 12:32:39,365 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [853934228] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:32:39,366 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 12:32:39,366 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-11-02 12:32:39,366 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127851656] [2024-11-02 12:32:39,366 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:32:39,366 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-11-02 12:32:39,366 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:32:39,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-11-02 12:32:39,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-02 12:32:39,367 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand has 4 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2024-11-02 12:32:39,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:32:39,405 INFO L93 Difference]: Finished difference Result 29 states and 36 transitions. [2024-11-02 12:32:39,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-02 12:32:39,406 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 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 12 [2024-11-02 12:32:39,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:32:39,406 INFO L225 Difference]: With dead ends: 29 [2024-11-02 12:32:39,406 INFO L226 Difference]: Without dead ends: 29 [2024-11-02 12:32:39,407 INFO L431 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 [2024-11-02 12:32:39,407 INFO L432 NwaCegarLoop]: 11 mSDtfsCounter, 9 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-02 12:32:39,408 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 21 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-02 12:32:39,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2024-11-02 12:32:39,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2024-11-02 12:32:39,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.5) internal successors, (36), 28 states have internal predecessors, (36), 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) [2024-11-02 12:32:39,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2024-11-02 12:32:39,413 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 12 [2024-11-02 12:32:39,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:32:39,413 INFO L471 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2024-11-02 12:32:39,413 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2024-11-02 12:32:39,413 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2024-11-02 12:32:39,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2024-11-02 12:32:39,414 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:32:39,416 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:32:39,417 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2024-11-02 12:32:39,417 INFO L396 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2024-11-02 12:32:39,417 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:32:39,418 INFO L85 PathProgramCache]: Analyzing trace with hash -616185168, now seen corresponding path program 1 times [2024-11-02 12:32:39,418 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:32:39,418 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1027561663] [2024-11-02 12:32:39,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:39,418 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:32:39,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:39,529 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:32:39,529 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:32:39,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1027561663] [2024-11-02 12:32:39,529 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1027561663] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:32:39,530 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1429777509] [2024-11-02 12:32:39,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:39,530 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:32:39,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:32:39,532 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:32:39,534 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-02 12:32:39,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:39,624 INFO L255 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-11-02 12:32:39,625 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:32:39,664 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:32:39,664 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:32:39,711 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:32:39,711 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1429777509] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 12:32:39,711 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [377677700] [2024-11-02 12:32:39,713 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2024-11-02 12:32:39,714 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 12:32:39,714 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 12:32:39,714 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 12:32:39,715 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 12:32:40,546 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 12:32:41,366 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1193#(and (= |ULTIMATE.start_diff_~B#1.offset| 0) (<= 1 |ULTIMATE.start_diff_~l1~0#1|) (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_diff_~D#1.base_19| Int)) (and (<= (select |#length| |v_ULTIMATE.start_diff_~D#1.base_19|) 3) (<= 2 |v_ULTIMATE.start_diff_~D#1.base_19|))) (<= |ULTIMATE.start_diff_~l2~0#1| 0) (<= 2 |ULTIMATE.start_main_#t~malloc10#1.base|) (<= 2 |ULTIMATE.start_diff_~A#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 4 (select |#length| |ULTIMATE.start_diff_~A#1.base|)) (<= 2 |ULTIMATE.start_diff_~B#1.base|) (= (select |#valid| |ULTIMATE.start_diff_~A#1.base|) 1) (<= 2 |ULTIMATE.start_main_#t~malloc11#1.base|) (= |ULTIMATE.start_diff_~i~0#1| 0) (= |ULTIMATE.start_diff_~A#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_diff_~A#1.base|) 0) |ULTIMATE.start_diff_#t~mem5#1|))' at error location [2024-11-02 12:32:41,367 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 12:32:41,367 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 12:32:41,367 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 10 [2024-11-02 12:32:41,367 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839680564] [2024-11-02 12:32:41,368 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 12:32:41,368 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2024-11-02 12:32:41,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:32:41,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2024-11-02 12:32:41,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2024-11-02 12:32:41,369 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 10 states, 10 states have (on average 1.9) internal successors, (19), 10 states have internal predecessors, (19), 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) [2024-11-02 12:32:41,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:32:41,467 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2024-11-02 12:32:41,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-11-02 12:32:41,467 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.9) internal successors, (19), 10 states have internal predecessors, (19), 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 12 [2024-11-02 12:32:41,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:32:41,468 INFO L225 Difference]: With dead ends: 27 [2024-11-02 12:32:41,468 INFO L226 Difference]: Without dead ends: 27 [2024-11-02 12:32:41,468 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=69, Invalid=393, Unknown=0, NotChecked=0, Total=462 [2024-11-02 12:32:41,469 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 22 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 12:32:41,469 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 50 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 12:32:41,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2024-11-02 12:32:41,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2024-11-02 12:32:41,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 25 states have internal predecessors, (30), 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) [2024-11-02 12:32:41,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2024-11-02 12:32:41,476 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 12 [2024-11-02 12:32:41,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:32:41,476 INFO L471 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2024-11-02 12:32:41,477 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.9) internal successors, (19), 10 states have internal predecessors, (19), 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) [2024-11-02 12:32:41,477 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2024-11-02 12:32:41,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2024-11-02 12:32:41,477 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:32:41,477 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:32:41,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2024-11-02 12:32:41,678 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2024-11-02 12:32:41,679 INFO L396 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2024-11-02 12:32:41,679 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:32:41,680 INFO L85 PathProgramCache]: Analyzing trace with hash -808856643, now seen corresponding path program 1 times [2024-11-02 12:32:41,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:32:41,680 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [821757566] [2024-11-02 12:32:41,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:41,680 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:32:41,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:41,807 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:32:41,807 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:32:41,807 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [821757566] [2024-11-02 12:32:41,807 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [821757566] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:32:41,808 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1664307869] [2024-11-02 12:32:41,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:41,808 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:32:41,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:32:41,810 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:32:41,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-02 12:32:41,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:41,895 INFO L255 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 13 conjuncts are in the unsatisfiable core [2024-11-02 12:32:41,897 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:32:42,012 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 27 [2024-11-02 12:32:42,077 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:32:42,077 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:32:42,144 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2024-11-02 12:32:42,203 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:32:42,203 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1664307869] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 12:32:42,203 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [237800762] [2024-11-02 12:32:42,205 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-02 12:32:42,209 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 12:32:42,209 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 12:32:42,209 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 12:32:42,210 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 12:32:43,379 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 12:32:44,285 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1355#(and (<= 1 |ULTIMATE.start_diff_~l1~0#1|) (exists ((|v_ULTIMATE.start_diff_~B#1.base_21| Int) (|v_ULTIMATE.start_diff_~j~0#1_37| Int) (|v_ULTIMATE.start_diff_~B#1.offset_20| Int)) (and (<= 0 |v_ULTIMATE.start_diff_~j~0#1_37|) (or (< (select |#length| |v_ULTIMATE.start_diff_~B#1.base_21|) (+ |v_ULTIMATE.start_diff_~B#1.offset_20| (* |v_ULTIMATE.start_diff_~j~0#1_37| 4) 4)) (< (+ |v_ULTIMATE.start_diff_~B#1.offset_20| (* |v_ULTIMATE.start_diff_~j~0#1_37| 4)) 0)))) (<= (+ |ULTIMATE.start_diff_~A#1.offset| 4) (select |#length| |ULTIMATE.start_diff_~A#1.base|)) (= |ULTIMATE.start_diff_~k~0#1| 0) (<= 1 |ULTIMATE.start_diff_~l2~0#1|) (= |ULTIMATE.start_diff_~found~0#1| 0) (<= 0 |ULTIMATE.start_diff_~A#1.offset|) (= (select |#valid| |ULTIMATE.start_diff_~A#1.base|) 1) (= |ULTIMATE.start_diff_~i~0#1| 0) (= |ULTIMATE.start_diff_#t~mem2#1| (select (select |#memory_int| |ULTIMATE.start_diff_~A#1.base|) |ULTIMATE.start_diff_~A#1.offset|)))' at error location [2024-11-02 12:32:44,285 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 12:32:44,285 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 12:32:44,285 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 17 [2024-11-02 12:32:44,285 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784972917] [2024-11-02 12:32:44,285 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 12:32:44,286 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-02 12:32:44,286 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:32:44,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-02 12:32:44,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=570, Unknown=0, NotChecked=0, Total=650 [2024-11-02 12:32:44,287 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 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) [2024-11-02 12:32:44,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:32:44,427 INFO L93 Difference]: Finished difference Result 43 states and 50 transitions. [2024-11-02 12:32:44,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-11-02 12:32:44,427 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 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 14 [2024-11-02 12:32:44,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:32:44,428 INFO L225 Difference]: With dead ends: 43 [2024-11-02 12:32:44,428 INFO L226 Difference]: Without dead ends: 43 [2024-11-02 12:32:44,428 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=95, Invalid=661, Unknown=0, NotChecked=0, Total=756 [2024-11-02 12:32:44,429 INFO L432 NwaCegarLoop]: 11 mSDtfsCounter, 21 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 12:32:44,429 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 90 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 12:32:44,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2024-11-02 12:32:44,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2024-11-02 12:32:44,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 39 states have internal predecessors, (49), 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) [2024-11-02 12:32:44,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 49 transitions. [2024-11-02 12:32:44,436 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 49 transitions. Word has length 14 [2024-11-02 12:32:44,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:32:44,437 INFO L471 AbstractCegarLoop]: Abstraction has 40 states and 49 transitions. [2024-11-02 12:32:44,437 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 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) [2024-11-02 12:32:44,437 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 49 transitions. [2024-11-02 12:32:44,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2024-11-02 12:32:44,438 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:32:44,438 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:32:44,462 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2024-11-02 12:32:44,638 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2024-11-02 12:32:44,639 INFO L396 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2024-11-02 12:32:44,639 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:32:44,639 INFO L85 PathProgramCache]: Analyzing trace with hash 696664853, now seen corresponding path program 1 times [2024-11-02 12:32:44,639 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:32:44,640 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1867647438] [2024-11-02 12:32:44,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:44,640 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:32:44,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:44,978 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2024-11-02 12:32:44,978 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:32:44,978 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1867647438] [2024-11-02 12:32:44,979 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1867647438] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:32:44,979 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1176364683] [2024-11-02 12:32:44,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:44,979 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:32:44,979 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:32:44,981 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:32:44,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2024-11-02 12:32:45,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:45,069 INFO L255 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 35 conjuncts are in the unsatisfiable core [2024-11-02 12:32:45,071 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:32:45,113 INFO L349 Elim1Store]: treesize reduction 31, result has 26.2 percent of original size [2024-11-02 12:32:45,113 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2024-11-02 12:32:45,155 INFO L349 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2024-11-02 12:32:45,155 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 1 case distinctions, treesize of input 13 treesize of output 15 [2024-11-02 12:32:45,184 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2024-11-02 12:32:45,185 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 19 [2024-11-02 12:32:45,673 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2024-11-02 12:32:45,674 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:32:45,844 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2024-11-02 12:32:45,845 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1176364683] provided 1 perfect and 1 imperfect interpolant sequences [2024-11-02 12:32:45,845 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2024-11-02 12:32:45,845 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 9 [2024-11-02 12:32:45,845 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480410662] [2024-11-02 12:32:45,845 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:32:45,847 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-02 12:32:45,849 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:32:45,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-02 12:32:45,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2024-11-02 12:32:45,850 INFO L87 Difference]: Start difference. First operand 40 states and 49 transitions. Second operand has 5 states, 4 states have (on average 3.75) internal successors, (15), 4 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) [2024-11-02 12:32:45,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:32:45,924 INFO L93 Difference]: Finished difference Result 62 states and 77 transitions. [2024-11-02 12:32:45,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-02 12:32:45,925 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 4 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 15 [2024-11-02 12:32:45,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:32:45,926 INFO L225 Difference]: With dead ends: 62 [2024-11-02 12:32:45,927 INFO L226 Difference]: Without dead ends: 62 [2024-11-02 12:32:45,927 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2024-11-02 12:32:45,928 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 6 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 12:32:45,928 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 30 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 12:32:45,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2024-11-02 12:32:45,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2024-11-02 12:32:45,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 56 states have (on average 1.375) internal successors, (77), 59 states have internal predecessors, (77), 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) [2024-11-02 12:32:45,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 77 transitions. [2024-11-02 12:32:45,940 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 77 transitions. Word has length 15 [2024-11-02 12:32:45,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:32:45,940 INFO L471 AbstractCegarLoop]: Abstraction has 60 states and 77 transitions. [2024-11-02 12:32:45,940 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 4 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) [2024-11-02 12:32:45,941 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 77 transitions. [2024-11-02 12:32:45,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2024-11-02 12:32:45,941 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:32:45,941 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:32:45,964 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2024-11-02 12:32:46,141 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2024-11-02 12:32:46,142 INFO L396 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 10 more)] === [2024-11-02 12:32:46,143 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:32:46,143 INFO L85 PathProgramCache]: Analyzing trace with hash 1613728163, now seen corresponding path program 2 times [2024-11-02 12:32:46,143 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:32:46,143 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497599766] [2024-11-02 12:32:46,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:32:46,144 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:32:46,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:32:46,368 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-11-02 12:32:46,368 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:32:46,368 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [497599766] [2024-11-02 12:32:46,369 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [497599766] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:32:46,369 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [292364485] [2024-11-02 12:32:46,369 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-02 12:32:46,369 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:32:46,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:32:46,371 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:32:46,373 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6067c67e-df6b-4003-9005-ced19a885c41/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2024-11-02 12:32:46,476 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2024-11-02 12:32:46,476 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-02 12:32:46,478 INFO L255 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 16 conjuncts are in the unsatisfiable core [2024-11-02 12:32:46,480 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:32:46,616 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 27 [2024-11-02 12:32:46,705 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-11-02 12:32:46,705 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:32:46,923 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2024-11-02 12:32:46,950 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-11-02 12:32:46,950 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [292364485] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 12:32:46,950 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [277275204] [2024-11-02 12:32:46,952 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2024-11-02 12:32:46,953 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 12:32:46,953 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 12:32:46,953 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 12:32:46,953 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs