./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh --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 b3d7899c651fa61cfb9cf623e0f4ceb470fe32eb0d0272d2277c965ed07c2f88 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 18:24:19,335 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 18:24:19,398 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-12-02 18:24:19,403 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 18:24:19,403 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 18:24:19,426 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 18:24:19,427 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 18:24:19,427 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 18:24:19,428 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 18:24:19,429 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 18:24:19,429 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 18:24:19,430 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 18:24:19,430 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 18:24:19,431 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 18:24:19,431 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 18:24:19,432 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 18:24:19,432 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 18:24:19,433 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 18:24:19,433 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 18:24:19,434 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 18:24:19,434 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 18:24:19,435 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 18:24:19,436 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-12-02 18:24:19,436 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-12-02 18:24:19,437 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 18:24:19,437 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 18:24:19,437 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 18:24:19,438 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 18:24:19,438 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 18:24:19,439 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-12-02 18:24:19,439 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-12-02 18:24:19,439 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-12-02 18:24:19,440 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 18:24:19,440 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-12-02 18:24:19,440 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-12-02 18:24:19,440 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 18:24:19,441 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 18:24:19,441 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 18:24:19,441 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 18:24:19,441 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 18:24:19,441 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 18:24:19,442 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 18:24:19,442 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 18:24:19,442 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 18:24:19,442 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 18:24:19,443 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 18:24:19,443 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 18:24:19,443 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 18:24:19,443 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_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b3d7899c651fa61cfb9cf623e0f4ceb470fe32eb0d0272d2277c965ed07c2f88 [2023-12-02 18:24:19,666 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 18:24:19,684 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 18:24:19,687 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 18:24:19,688 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 18:24:19,688 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 18:24:19,690 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i [2023-12-02 18:24:22,385 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 18:24:22,598 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 18:24:22,598 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i [2023-12-02 18:24:22,613 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/data/044e7a38f/aa5423bce2104207b8d70884221b93d7/FLAG469cb0cbe [2023-12-02 18:24:22,627 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/data/044e7a38f/aa5423bce2104207b8d70884221b93d7 [2023-12-02 18:24:22,629 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 18:24:22,631 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 18:24:22,632 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 18:24:22,632 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 18:24:22,637 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 18:24:22,638 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 06:24:22" (1/1) ... [2023-12-02 18:24:22,639 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@324d6081 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:24:22, skipping insertion in model container [2023-12-02 18:24:22,639 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 06:24:22" (1/1) ... [2023-12-02 18:24:22,687 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 18:24:22,958 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 18:24:22,965 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 18:24:23,001 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 18:24:23,026 INFO L206 MainTranslator]: Completed translation [2023-12-02 18:24:23,026 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:24:23 WrapperNode [2023-12-02 18:24:23,026 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 18:24:23,027 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 18:24:23,027 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 18:24:23,028 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 18:24:23,033 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:24:23" (1/1) ... [2023-12-02 18:24:23,046 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:24:23" (1/1) ... [2023-12-02 18:24:23,070 INFO L138 Inliner]: procedures = 126, calls = 31, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 112 [2023-12-02 18:24:23,071 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 18:24:23,071 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 18:24:23,072 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 18:24:23,072 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 18:24:23,080 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:24:23" (1/1) ... [2023-12-02 18:24:23,080 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:24:23" (1/1) ... [2023-12-02 18:24:23,084 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:24:23" (1/1) ... [2023-12-02 18:24:23,085 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:24:23" (1/1) ... [2023-12-02 18:24:23,093 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:24:23" (1/1) ... [2023-12-02 18:24:23,097 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:24:23" (1/1) ... [2023-12-02 18:24:23,099 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:24:23" (1/1) ... [2023-12-02 18:24:23,101 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:24:23" (1/1) ... [2023-12-02 18:24:23,104 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 18:24:23,105 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 18:24:23,105 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 18:24:23,105 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 18:24:23,106 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:24:23" (1/1) ... [2023-12-02 18:24:23,112 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 18:24:23,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:24:23,134 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 18:24:23,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 18:24:23,178 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 18:24:23,178 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-12-02 18:24:23,178 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 18:24:23,178 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 18:24:23,179 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-12-02 18:24:23,179 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-12-02 18:24:23,179 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 18:24:23,179 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-12-02 18:24:23,179 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 18:24:23,179 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 18:24:23,180 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 18:24:23,302 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 18:24:23,304 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 18:24:23,570 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 18:24:23,612 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 18:24:23,612 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-12-02 18:24:23,614 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 06:24:23 BoogieIcfgContainer [2023-12-02 18:24:23,614 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 18:24:23,618 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 18:24:23,618 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 18:24:23,621 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 18:24:23,621 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 06:24:22" (1/3) ... [2023-12-02 18:24:23,622 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4bdc64f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 06:24:23, skipping insertion in model container [2023-12-02 18:24:23,622 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:24:23" (2/3) ... [2023-12-02 18:24:23,623 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4bdc64f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 06:24:23, skipping insertion in model container [2023-12-02 18:24:23,623 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 06:24:23" (3/3) ... [2023-12-02 18:24:23,624 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2n_remove_all_reverse.i [2023-12-02 18:24:23,642 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 18:24:23,643 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 32 error locations. [2023-12-02 18:24:23,688 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 18:24:23,695 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@1c02c842, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 18:24:23,695 INFO L358 AbstractCegarLoop]: Starting to check reachability of 32 error locations. [2023-12-02 18:24:23,699 INFO L276 IsEmpty]: Start isEmpty. Operand has 64 states, 31 states have (on average 2.2903225806451615) internal successors, (71), 63 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:24:23,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-12-02 18:24:23,706 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:24:23,707 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-12-02 18:24:23,707 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr28REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:24:23,712 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:24:23,712 INFO L85 PathProgramCache]: Analyzing trace with hash 5148869, now seen corresponding path program 1 times [2023-12-02 18:24:23,719 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:24:23,719 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1108094405] [2023-12-02 18:24:23,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:24:23,720 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:24:23,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:24:23,928 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:24:23,929 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:24:23,929 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1108094405] [2023-12-02 18:24:23,930 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1108094405] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:24:23,930 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:24:23,930 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 18:24:23,932 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004047263] [2023-12-02 18:24:23,932 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:24:23,936 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:24:23,937 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:24:23,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:24:23,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 18:24:23,969 INFO L87 Difference]: Start difference. First operand has 64 states, 31 states have (on average 2.2903225806451615) internal successors, (71), 63 states have internal predecessors, (71), 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, 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) [2023-12-02 18:24:24,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:24:24,020 INFO L93 Difference]: Finished difference Result 75 states and 80 transitions. [2023-12-02 18:24:24,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:24:24,022 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 [2023-12-02 18:24:24,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:24:24,029 INFO L225 Difference]: With dead ends: 75 [2023-12-02 18:24:24,029 INFO L226 Difference]: Without dead ends: 72 [2023-12-02 18:24:24,030 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 18:24:24,033 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 12 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 18:24:24,034 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 112 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 18:24:24,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2023-12-02 18:24:24,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 62. [2023-12-02 18:24:24,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 61 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:24:24,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 65 transitions. [2023-12-02 18:24:24,062 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 65 transitions. Word has length 4 [2023-12-02 18:24:24,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:24:24,063 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 65 transitions. [2023-12-02 18:24:24,063 INFO L496 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) [2023-12-02 18:24:24,063 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 65 transitions. [2023-12-02 18:24:24,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-12-02 18:24:24,064 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:24:24,064 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-12-02 18:24:24,064 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 18:24:24,064 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:24:24,065 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:24:24,065 INFO L85 PathProgramCache]: Analyzing trace with hash 5015013, now seen corresponding path program 1 times [2023-12-02 18:24:24,066 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:24:24,066 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713014370] [2023-12-02 18:24:24,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:24:24,066 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:24:24,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:24:24,133 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:24:24,134 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:24:24,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713014370] [2023-12-02 18:24:24,134 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [713014370] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:24:24,134 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:24:24,135 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 18:24:24,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304639977] [2023-12-02 18:24:24,135 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:24:24,136 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:24:24,136 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:24:24,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:24:24,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 18:24:24,138 INFO L87 Difference]: Start difference. First operand 62 states and 65 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:24:24,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:24:24,204 INFO L93 Difference]: Finished difference Result 60 states and 63 transitions. [2023-12-02 18:24:24,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:24:24,205 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-12-02 18:24:24,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:24:24,206 INFO L225 Difference]: With dead ends: 60 [2023-12-02 18:24:24,207 INFO L226 Difference]: Without dead ends: 60 [2023-12-02 18:24:24,207 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 18:24:24,209 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 3 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:24:24,210 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 74 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:24:24,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-12-02 18:24:24,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2023-12-02 18:24:24,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 30 states have (on average 2.1) internal successors, (63), 59 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:24:24,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 63 transitions. [2023-12-02 18:24:24,217 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 63 transitions. Word has length 4 [2023-12-02 18:24:24,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:24:24,218 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 63 transitions. [2023-12-02 18:24:24,218 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:24:24,218 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 63 transitions. [2023-12-02 18:24:24,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-12-02 18:24:24,219 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:24:24,219 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-12-02 18:24:24,219 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 18:24:24,219 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:24:24,220 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:24:24,220 INFO L85 PathProgramCache]: Analyzing trace with hash 5015014, now seen corresponding path program 1 times [2023-12-02 18:24:24,220 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:24:24,220 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [649272192] [2023-12-02 18:24:24,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:24:24,221 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:24:24,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:24:24,305 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:24:24,306 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:24:24,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [649272192] [2023-12-02 18:24:24,306 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [649272192] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:24:24,306 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:24:24,306 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 18:24:24,307 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109826614] [2023-12-02 18:24:24,307 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:24:24,307 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:24:24,307 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:24:24,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:24:24,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 18:24:24,308 INFO L87 Difference]: Start difference. First operand 60 states and 63 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:24:24,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:24:24,371 INFO L93 Difference]: Finished difference Result 58 states and 61 transitions. [2023-12-02 18:24:24,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:24:24,371 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-12-02 18:24:24,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:24:24,372 INFO L225 Difference]: With dead ends: 58 [2023-12-02 18:24:24,372 INFO L226 Difference]: Without dead ends: 58 [2023-12-02 18:24:24,373 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 18:24:24,374 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 1 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:24:24,375 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 80 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:24:24,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-12-02 18:24:24,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2023-12-02 18:24:24,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 30 states have (on average 2.033333333333333) internal successors, (61), 57 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:24:24,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 61 transitions. [2023-12-02 18:24:24,381 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 61 transitions. Word has length 4 [2023-12-02 18:24:24,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:24:24,382 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 61 transitions. [2023-12-02 18:24:24,382 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:24:24,382 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 61 transitions. [2023-12-02 18:24:24,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-12-02 18:24:24,382 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:24:24,382 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-12-02 18:24:24,382 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-12-02 18:24:24,383 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:24:24,383 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:24:24,383 INFO L85 PathProgramCache]: Analyzing trace with hash 524463697, now seen corresponding path program 1 times [2023-12-02 18:24:24,383 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:24:24,384 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193229622] [2023-12-02 18:24:24,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:24:24,384 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:24:24,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:24:24,454 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:24:24,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:24:24,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193229622] [2023-12-02 18:24:24,455 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [193229622] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:24:24,455 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:24:24,455 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 18:24:24,455 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86256274] [2023-12-02 18:24:24,455 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:24:24,455 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 18:24:24,456 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:24:24,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 18:24:24,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 18:24:24,456 INFO L87 Difference]: Start difference. First operand 58 states and 61 transitions. Second operand has 4 states, 3 states have (on average 2.0) 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) [2023-12-02 18:24:24,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:24:24,553 INFO L93 Difference]: Finished difference Result 60 states and 63 transitions. [2023-12-02 18:24:24,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 18:24:24,553 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) 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 [2023-12-02 18:24:24,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:24:24,554 INFO L225 Difference]: With dead ends: 60 [2023-12-02 18:24:24,554 INFO L226 Difference]: Without dead ends: 60 [2023-12-02 18:24:24,555 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-12-02 18:24:24,556 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 5 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:24:24,557 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 95 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:24:24,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-12-02 18:24:24,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 57. [2023-12-02 18:24:24,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 30 states have (on average 2.0) internal successors, (60), 56 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:24:24,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2023-12-02 18:24:24,562 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 6 [2023-12-02 18:24:24,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:24:24,562 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2023-12-02 18:24:24,563 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) 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) [2023-12-02 18:24:24,563 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2023-12-02 18:24:24,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-12-02 18:24:24,563 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:24:24,563 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-12-02 18:24:24,563 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 18:24:24,564 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:24:24,564 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:24:24,564 INFO L85 PathProgramCache]: Analyzing trace with hash 524463698, now seen corresponding path program 1 times [2023-12-02 18:24:24,564 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:24:24,565 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1196176228] [2023-12-02 18:24:24,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:24:24,565 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:24:24,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:24:24,689 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:24:24,690 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:24:24,690 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1196176228] [2023-12-02 18:24:24,690 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1196176228] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:24:24,690 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:24:24,690 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 18:24:24,691 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721061757] [2023-12-02 18:24:24,691 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:24:24,691 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 18:24:24,691 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:24:24,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 18:24:24,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 18:24:24,692 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:24:24,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:24:24,767 INFO L93 Difference]: Finished difference Result 59 states and 62 transitions. [2023-12-02 18:24:24,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 18:24:24,767 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-12-02 18:24:24,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:24:24,768 INFO L225 Difference]: With dead ends: 59 [2023-12-02 18:24:24,768 INFO L226 Difference]: Without dead ends: 59 [2023-12-02 18:24:24,769 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-12-02 18:24:24,770 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 4 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:24:24,770 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 123 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:24:24,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-12-02 18:24:24,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2023-12-02 18:24:24,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 30 states have (on average 1.9666666666666666) internal successors, (59), 55 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:24:24,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2023-12-02 18:24:24,775 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 6 [2023-12-02 18:24:24,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:24:24,775 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2023-12-02 18:24:24,775 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:24:24,776 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2023-12-02 18:24:24,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 18:24:24,776 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:24:24,776 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:24:24,776 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-12-02 18:24:24,777 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr28REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:24:24,777 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:24:24,777 INFO L85 PathProgramCache]: Analyzing trace with hash -789544948, now seen corresponding path program 1 times [2023-12-02 18:24:24,777 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:24:24,777 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1788956482] [2023-12-02 18:24:24,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:24:24,778 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:24:24,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:24:24,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:24:24,847 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:24:24,847 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1788956482] [2023-12-02 18:24:24,847 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1788956482] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:24:24,847 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [44725789] [2023-12-02 18:24:24,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:24:24,847 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:24:24,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:24:24,853 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:24:24,857 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 18:24:24,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:24:24,954 INFO L262 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 18:24:24,959 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:24:24,998 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:24:24,998 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:24:25,018 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:24:25,019 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [44725789] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:24:25,019 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [635310422] [2023-12-02 18:24:25,038 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 18:24:25,038 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:24:25,042 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:24:25,047 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:24:25,048 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:24:26,937 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:24:35,178 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [635310422] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:24:35,178 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:24:35,178 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 10 [2023-12-02 18:24:35,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920189432] [2023-12-02 18:24:35,179 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:24:35,179 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 18:24:35,179 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:24:35,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 18:24:35,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=79, Unknown=4, NotChecked=0, Total=110 [2023-12-02 18:24:35,180 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:24:36,726 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.18s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 18:24:41,594 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 18:24:42,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:24:42,777 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2023-12-02 18:24:42,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 18:24:42,778 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 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 9 [2023-12-02 18:24:42,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:24:42,779 INFO L225 Difference]: With dead ends: 86 [2023-12-02 18:24:42,779 INFO L226 Difference]: Without dead ends: 86 [2023-12-02 18:24:42,779 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=27, Invalid=79, Unknown=4, NotChecked=0, Total=110 [2023-12-02 18:24:42,780 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 31 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 312 mSolverCounterSat, 0 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 312 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.6s IncrementalHoareTripleChecker+Time [2023-12-02 18:24:42,781 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 82 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 312 Invalid, 4 Unknown, 0 Unchecked, 7.6s Time] [2023-12-02 18:24:42,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2023-12-02 18:24:42,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 57. [2023-12-02 18:24:42,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 31 states have (on average 1.935483870967742) internal successors, (60), 56 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:24:42,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2023-12-02 18:24:42,786 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 9 [2023-12-02 18:24:42,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:24:42,786 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2023-12-02 18:24:42,786 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:24:42,786 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2023-12-02 18:24:42,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 18:24:42,787 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:24:42,787 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:24:42,793 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 18:24:42,987 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:24:42,988 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:24:42,988 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:24:42,988 INFO L85 PathProgramCache]: Analyzing trace with hash -789548110, now seen corresponding path program 1 times [2023-12-02 18:24:42,988 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:24:42,988 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [400602204] [2023-12-02 18:24:42,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:24:42,989 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:24:43,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:24:43,059 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:24:43,059 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:24:43,059 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [400602204] [2023-12-02 18:24:43,060 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [400602204] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:24:43,060 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1370603324] [2023-12-02 18:24:43,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:24:43,060 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:24:43,060 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:24:43,061 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:24:43,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 18:24:43,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:24:43,150 INFO L262 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 18:24:43,151 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:24:43,165 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:24:43,165 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:24:43,180 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:24:43,180 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1370603324] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:24:43,180 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1498843805] [2023-12-02 18:24:43,182 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 18:24:43,183 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:24:43,183 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:24:43,183 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:24:43,183 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:24:44,274 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:24:54,911 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1498843805] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:24:54,912 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:24:54,912 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 11 [2023-12-02 18:24:54,912 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852636545] [2023-12-02 18:24:54,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:24:54,912 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 18:24:54,912 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:24:54,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 18:24:54,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=97, Unknown=6, NotChecked=0, Total=132 [2023-12-02 18:24:54,913 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:24:56,479 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 18:25:01,339 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.46s for a HTC check with result VALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 18:25:05,071 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 18:25:07,187 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 18:25:09,302 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 18:25:11,832 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 18:25:15,391 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 18:25:17,403 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 18:25:19,978 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 18:25:22,574 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 18:25:24,715 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 18:25:26,262 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.29s for a HTC check with result VALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 18:25:26,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:25:26,965 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2023-12-02 18:25:26,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 18:25:26,965 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 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 9 [2023-12-02 18:25:26,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:25:26,966 INFO L225 Difference]: With dead ends: 80 [2023-12-02 18:25:26,966 INFO L226 Difference]: Without dead ends: 80 [2023-12-02 18:25:26,966 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=29, Invalid=97, Unknown=6, NotChecked=0, Total=132 [2023-12-02 18:25:26,967 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 25 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 354 mSolverCounterSat, 21 mSolverCounterUnsat, 12 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 31.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 387 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 354 IncrementalHoareTripleChecker+Invalid, 12 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 32.0s IncrementalHoareTripleChecker+Time [2023-12-02 18:25:26,967 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 98 Invalid, 387 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 354 Invalid, 12 Unknown, 0 Unchecked, 32.0s Time] [2023-12-02 18:25:26,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-12-02 18:25:26,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 62. [2023-12-02 18:25:26,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 36 states have (on average 1.8888888888888888) internal successors, (68), 61 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:25:26,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 68 transitions. [2023-12-02 18:25:26,972 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 68 transitions. Word has length 9 [2023-12-02 18:25:26,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:25:26,973 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 68 transitions. [2023-12-02 18:25:26,973 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:25:26,973 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 68 transitions. [2023-12-02 18:25:26,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-12-02 18:25:26,973 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:25:26,973 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:25:26,979 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 18:25:27,174 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:25:27,174 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:25:27,175 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:25:27,175 INFO L85 PathProgramCache]: Analyzing trace with hash 1293812386, now seen corresponding path program 1 times [2023-12-02 18:25:27,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:25:27,175 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141629461] [2023-12-02 18:25:27,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:25:27,175 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:25:27,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:25:27,234 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:25:27,234 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:25:27,235 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141629461] [2023-12-02 18:25:27,235 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [141629461] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:25:27,235 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1621383608] [2023-12-02 18:25:27,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:25:27,235 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:25:27,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:25:27,237 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:25:27,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 18:25:27,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:25:27,321 INFO L262 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 18:25:27,322 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:25:27,337 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:25:27,337 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:25:27,355 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:25:27,355 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1621383608] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:25:27,355 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2066367494] [2023-12-02 18:25:27,357 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 18:25:27,357 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:25:27,357 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:25:27,358 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:25:27,358 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:25:28,293 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:25:38,707 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [2066367494] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:25:38,707 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:25:38,707 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [3, 3, 3] total 12 [2023-12-02 18:25:38,707 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780474667] [2023-12-02 18:25:38,707 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:25:38,707 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-12-02 18:25:38,707 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:25:38,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-12-02 18:25:38,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=118, Unknown=4, NotChecked=0, Total=156 [2023-12-02 18:25:38,708 INFO L87 Difference]: Start difference. First operand 62 states and 68 transitions. Second operand has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 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) [2023-12-02 18:25:45,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:25:45,107 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2023-12-02 18:25:45,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 18:25:45,108 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 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 [2023-12-02 18:25:45,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:25:45,109 INFO L225 Difference]: With dead ends: 78 [2023-12-02 18:25:45,109 INFO L226 Difference]: Without dead ends: 78 [2023-12-02 18:25:45,109 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=34, Invalid=118, Unknown=4, NotChecked=0, Total=156 [2023-12-02 18:25:45,110 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 21 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 403 mSolverCounterSat, 1 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 406 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 403 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.4s IncrementalHoareTripleChecker+Time [2023-12-02 18:25:45,110 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 108 Invalid, 406 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 403 Invalid, 2 Unknown, 0 Unchecked, 6.4s Time] [2023-12-02 18:25:45,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2023-12-02 18:25:45,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 62. [2023-12-02 18:25:45,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 36 states have (on average 1.8333333333333333) internal successors, (66), 61 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:25:45,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2023-12-02 18:25:45,113 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 10 [2023-12-02 18:25:45,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:25:45,113 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2023-12-02 18:25:45,113 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 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) [2023-12-02 18:25:45,114 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2023-12-02 18:25:45,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-12-02 18:25:45,114 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:25:45,114 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:25:45,118 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 18:25:45,314 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:25:45,315 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:25:45,315 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:25:45,315 INFO L85 PathProgramCache]: Analyzing trace with hash 928317774, now seen corresponding path program 1 times [2023-12-02 18:25:45,315 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:25:45,315 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [363802388] [2023-12-02 18:25:45,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:25:45,315 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:25:45,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:25:45,379 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:25:45,379 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:25:45,379 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [363802388] [2023-12-02 18:25:45,380 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [363802388] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:25:45,380 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1746652681] [2023-12-02 18:25:45,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:25:45,380 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:25:45,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:25:45,381 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:25:45,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 18:25:45,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:25:45,472 INFO L262 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 18:25:45,473 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:25:45,489 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:25:45,489 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:25:45,511 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:25:45,511 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1746652681] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:25:45,511 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1361614989] [2023-12-02 18:25:45,514 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 18:25:45,514 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:25:45,514 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:25:45,514 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:25:45,514 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:25:46,560 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:25:59,668 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1361614989] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:25:59,668 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:25:59,668 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [3, 3, 3] total 15 [2023-12-02 18:25:59,669 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485901112] [2023-12-02 18:25:59,669 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:25:59,669 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 18:25:59,669 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:25:59,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 18:25:59,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=188, Unknown=4, NotChecked=0, Total=240 [2023-12-02 18:25:59,670 INFO L87 Difference]: Start difference. First operand 62 states and 66 transitions. Second operand has 13 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:26:01,074 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 18:26:04,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:26:04,714 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2023-12-02 18:26:04,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 18:26:04,714 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 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 13 [2023-12-02 18:26:04,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:26:04,715 INFO L225 Difference]: With dead ends: 76 [2023-12-02 18:26:04,715 INFO L226 Difference]: Without dead ends: 76 [2023-12-02 18:26:04,715 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 23 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=48, Invalid=188, Unknown=4, NotChecked=0, Total=240 [2023-12-02 18:26:04,716 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 31 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 3 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 325 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2023-12-02 18:26:04,716 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 79 Invalid, 325 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 320 Invalid, 2 Unknown, 0 Unchecked, 5.0s Time] [2023-12-02 18:26:04,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-12-02 18:26:04,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 64. [2023-12-02 18:26:04,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 38 states have (on average 1.8157894736842106) internal successors, (69), 63 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:26:04,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2023-12-02 18:26:04,721 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 13 [2023-12-02 18:26:04,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:26:04,721 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2023-12-02 18:26:04,721 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:26:04,722 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2023-12-02 18:26:04,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-12-02 18:26:04,722 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:26:04,722 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:26:04,726 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 18:26:04,922 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:26:04,923 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:26:04,923 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:26:04,923 INFO L85 PathProgramCache]: Analyzing trace with hash -1239816009, now seen corresponding path program 1 times [2023-12-02 18:26:04,923 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:26:04,923 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [705929315] [2023-12-02 18:26:04,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:26:04,923 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:26:04,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:26:04,985 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:26:04,985 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:26:04,986 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [705929315] [2023-12-02 18:26:04,986 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [705929315] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:26:04,986 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [486312571] [2023-12-02 18:26:04,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:26:04,986 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:26:04,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:26:04,987 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:26:04,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 18:26:05,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:26:05,093 INFO L262 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 18:26:05,094 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:26:05,108 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:26:05,109 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:26:05,126 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:26:05,126 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [486312571] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:26:05,126 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1343831367] [2023-12-02 18:26:05,129 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 18:26:05,129 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:26:05,129 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:26:05,129 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:26:05,129 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:26:06,233 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:26:20,275 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1343831367] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:26:20,275 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:26:20,275 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [3, 3, 3] total 16 [2023-12-02 18:26:20,275 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10935704] [2023-12-02 18:26:20,275 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:26:20,276 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 18:26:20,276 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:26:20,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 18:26:20,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=215, Unknown=3, NotChecked=0, Total=272 [2023-12-02 18:26:20,277 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand has 14 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:26:27,239 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 18:26:29,303 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 18:26:30,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:26:30,759 INFO L93 Difference]: Finished difference Result 73 states and 77 transitions. [2023-12-02 18:26:30,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 18:26:30,759 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 13 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 [2023-12-02 18:26:30,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:26:30,760 INFO L225 Difference]: With dead ends: 73 [2023-12-02 18:26:30,760 INFO L226 Difference]: Without dead ends: 73 [2023-12-02 18:26:30,761 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=54, Invalid=215, Unknown=3, NotChecked=0, Total=272 [2023-12-02 18:26:30,761 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 12 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 518 mSolverCounterSat, 0 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 523 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 518 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.5s IncrementalHoareTripleChecker+Time [2023-12-02 18:26:30,761 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 112 Invalid, 523 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 518 Invalid, 5 Unknown, 0 Unchecked, 10.5s Time] [2023-12-02 18:26:30,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2023-12-02 18:26:30,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 63. [2023-12-02 18:26:30,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 37 states have (on average 1.7837837837837838) internal successors, (66), 62 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:26:30,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2023-12-02 18:26:30,765 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 15 [2023-12-02 18:26:30,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:26:30,765 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2023-12-02 18:26:30,766 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:26:30,766 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2023-12-02 18:26:30,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-12-02 18:26:30,766 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:26:30,766 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:26:30,771 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 18:26:30,966 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 18:26:30,967 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:26:30,967 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:26:30,967 INFO L85 PathProgramCache]: Analyzing trace with hash -1239815954, now seen corresponding path program 1 times [2023-12-02 18:26:30,967 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:26:30,967 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580903623] [2023-12-02 18:26:30,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:26:30,967 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:26:30,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:26:31,027 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:26:31,027 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:26:31,027 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1580903623] [2023-12-02 18:26:31,027 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1580903623] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:26:31,028 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [374460290] [2023-12-02 18:26:31,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:26:31,028 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:26:31,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:26:31,029 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:26:31,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 18:26:31,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:26:31,122 INFO L262 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 18:26:31,123 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:26:31,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:26:31,131 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 18:26:31,131 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [374460290] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:26:31,131 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 18:26:31,131 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 5 [2023-12-02 18:26:31,131 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720904669] [2023-12-02 18:26:31,131 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:26:31,132 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:26:31,132 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:26:31,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:26:31,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 18:26:31,132 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand has 3 states, 2 states have (on average 7.5) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:26:31,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:26:31,179 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2023-12-02 18:26:31,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:26:31,179 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 7.5) internal successors, (15), 3 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 [2023-12-02 18:26:31,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:26:31,180 INFO L225 Difference]: With dead ends: 61 [2023-12-02 18:26:31,180 INFO L226 Difference]: Without dead ends: 61 [2023-12-02 18:26:31,181 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 18:26:31,181 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 9 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 18:26:31,182 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 55 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 18:26:31,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-12-02 18:26:31,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2023-12-02 18:26:31,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 60 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:26:31,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2023-12-02 18:26:31,185 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 15 [2023-12-02 18:26:31,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:26:31,186 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2023-12-02 18:26:31,186 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 7.5) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:26:31,186 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2023-12-02 18:26:31,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-12-02 18:26:31,187 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:26:31,187 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:26:31,197 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 18:26:31,392 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:26:31,393 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:26:31,393 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:26:31,393 INFO L85 PathProgramCache]: Analyzing trace with hash -1239815953, now seen corresponding path program 1 times [2023-12-02 18:26:31,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:26:31,393 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310775334] [2023-12-02 18:26:31,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:26:31,393 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:26:31,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:26:31,452 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:26:31,452 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:26:31,452 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1310775334] [2023-12-02 18:26:31,452 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1310775334] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:26:31,453 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [318447193] [2023-12-02 18:26:31,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:26:31,453 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:26:31,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:26:31,454 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:26:31,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 18:26:31,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:26:31,560 INFO L262 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 18:26:31,561 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:26:31,575 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:26:31,575 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 18:26:31,575 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [318447193] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:26:31,575 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 18:26:31,575 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 5 [2023-12-02 18:26:31,575 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292765331] [2023-12-02 18:26:31,575 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:26:31,576 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:26:31,576 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:26:31,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:26:31,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 18:26:31,577 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand has 3 states, 2 states have (on average 7.5) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:26:31,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:26:31,618 INFO L93 Difference]: Finished difference Result 60 states and 63 transitions. [2023-12-02 18:26:31,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:26:31,618 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 7.5) internal successors, (15), 3 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 [2023-12-02 18:26:31,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:26:31,619 INFO L225 Difference]: With dead ends: 60 [2023-12-02 18:26:31,619 INFO L226 Difference]: Without dead ends: 60 [2023-12-02 18:26:31,619 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 18:26:31,620 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 8 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 18:26:31,620 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 57 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 18:26:31,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-12-02 18:26:31,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2023-12-02 18:26:31,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 37 states have (on average 1.7027027027027026) internal successors, (63), 59 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:26:31,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 63 transitions. [2023-12-02 18:26:31,622 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 63 transitions. Word has length 15 [2023-12-02 18:26:31,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:26:31,623 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 63 transitions. [2023-12-02 18:26:31,623 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 7.5) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:26:31,623 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 63 transitions. [2023-12-02 18:26:31,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-12-02 18:26:31,623 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:26:31,623 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:26:31,628 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 18:26:31,824 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 18:26:31,824 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:26:31,824 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:26:31,824 INFO L85 PathProgramCache]: Analyzing trace with hash 220412658, now seen corresponding path program 1 times [2023-12-02 18:26:31,825 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:26:31,825 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532726409] [2023-12-02 18:26:31,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:26:31,825 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:26:31,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:26:31,883 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:26:31,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:26:31,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532726409] [2023-12-02 18:26:31,884 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1532726409] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:26:31,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1249823807] [2023-12-02 18:26:31,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:26:31,884 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:26:31,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:26:31,885 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:26:31,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 18:26:31,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:26:31,989 INFO L262 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 18:26:31,990 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:26:32,001 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:26:32,001 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:26:32,016 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:26:32,016 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1249823807] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:26:32,016 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1097431376] [2023-12-02 18:26:32,018 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 18:26:32,018 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:26:32,018 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:26:32,018 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:26:32,018 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:26:33,339 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:26:46,444 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2203#(and (<= 2 |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (<= 1 |#StackHeapBarrier|) (or (< (select |#length| |ULTIMATE.start_sll_remove_last_~last~0#1.base|) (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 8)) (< (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 4) 0)) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start_node_create_#res#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= 2 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-12-02 18:26:46,444 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:26:46,444 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:26:46,444 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 4 [2023-12-02 18:26:46,444 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592760687] [2023-12-02 18:26:46,444 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:26:46,445 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 18:26:46,445 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:26:46,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 18:26:46,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=278, Unknown=3, NotChecked=0, Total=342 [2023-12-02 18:26:46,446 INFO L87 Difference]: Start difference. First operand 60 states and 63 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:26:46,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:26:46,471 INFO L93 Difference]: Finished difference Result 65 states and 68 transitions. [2023-12-02 18:26:46,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 18:26:46,471 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-12-02 18:26:46,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:26:46,472 INFO L225 Difference]: With dead ends: 65 [2023-12-02 18:26:46,472 INFO L226 Difference]: Without dead ends: 65 [2023-12-02 18:26:46,472 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=61, Invalid=278, Unknown=3, NotChecked=0, Total=342 [2023-12-02 18:26:46,473 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 4 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 18:26:46,473 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 135 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 18:26:46,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-12-02 18:26:46,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2023-12-02 18:26:46,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 42 states have (on average 1.619047619047619) internal successors, (68), 64 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:26:46,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2023-12-02 18:26:46,476 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 16 [2023-12-02 18:26:46,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:26:46,476 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2023-12-02 18:26:46,476 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:26:46,476 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2023-12-02 18:26:46,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-12-02 18:26:46,477 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:26:46,477 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:26:46,482 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 18:26:46,677 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 18:26:46,678 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:26:46,678 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:26:46,678 INFO L85 PathProgramCache]: Analyzing trace with hash 1840084921, now seen corresponding path program 2 times [2023-12-02 18:26:46,678 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:26:46,678 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613719993] [2023-12-02 18:26:46,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:26:46,678 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:26:46,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:26:47,536 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:26:47,536 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:26:47,537 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613719993] [2023-12-02 18:26:47,537 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1613719993] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:26:47,537 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1238994729] [2023-12-02 18:26:47,537 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 18:26:47,537 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:26:47,537 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:26:47,538 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:26:47,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 18:26:47,667 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 18:26:47,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 18:26:47,670 INFO L262 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 76 conjunts are in the unsatisfiable core [2023-12-02 18:26:47,674 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:26:47,716 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 18:26:47,722 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 18:26:47,845 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-12-02 18:26:47,845 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-12-02 18:26:47,861 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-12-02 18:26:47,943 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 18:26:47,949 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 19 treesize of output 1 [2023-12-02 18:26:48,198 INFO L349 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2023-12-02 18:26:48,199 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 76 treesize of output 29 [2023-12-02 18:26:48,210 INFO L349 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2023-12-02 18:26:48,210 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 18 [2023-12-02 18:26:48,216 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:26:48,216 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:26:48,474 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 130 treesize of output 122 [2023-12-02 18:26:48,575 INFO L349 Elim1Store]: treesize reduction 37, result has 66.7 percent of original size [2023-12-02 18:26:48,575 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 260 treesize of output 287 [2023-12-02 18:26:48,840 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 18:26:48,880 INFO L349 Elim1Store]: treesize reduction 27, result has 57.1 percent of original size [2023-12-02 18:26:48,881 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 284 treesize of output 259 [2023-12-02 18:26:49,032 INFO L349 Elim1Store]: treesize reduction 37, result has 66.7 percent of original size [2023-12-02 18:26:49,032 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 560 treesize of output 535 [2023-12-02 18:26:49,792 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:26:49,792 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1238994729] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:26:49,792 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1722113573] [2023-12-02 18:26:49,794 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 18:26:49,794 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:26:49,794 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:26:49,794 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:26:49,795 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:26:51,176 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:27:15,041 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2500#(and (<= 2 |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (<= 1 |#StackHeapBarrier|) (or (< (select |#length| |ULTIMATE.start_sll_remove_last_~last~0#1.base|) (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 8)) (< (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 4) 0)) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start_node_create_#res#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= 2 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-12-02 18:27:15,041 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:27:15,041 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:27:15,041 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 10] total 32 [2023-12-02 18:27:15,042 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97600955] [2023-12-02 18:27:15,042 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:27:15,042 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-12-02 18:27:15,042 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:27:15,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-12-02 18:27:15,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=1949, Unknown=6, NotChecked=0, Total=2162 [2023-12-02 18:27:15,044 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand has 33 states, 32 states have (on average 1.90625) internal successors, (61), 33 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:27:16,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:27:16,693 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2023-12-02 18:27:16,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-12-02 18:27:16,693 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.90625) internal successors, (61), 33 states have internal predecessors, (61), 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 21 [2023-12-02 18:27:16,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:27:16,694 INFO L225 Difference]: With dead ends: 86 [2023-12-02 18:27:16,694 INFO L226 Difference]: Without dead ends: 86 [2023-12-02 18:27:16,696 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 890 ImplicationChecksByTransitivity, 25.7s TimeCoverageRelationStatistics Valid=447, Invalid=3453, Unknown=6, NotChecked=0, Total=3906 [2023-12-02 18:27:16,697 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 199 mSDsluCounter, 315 mSDsCounter, 0 mSdLazyCounter, 830 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 343 SdHoareTripleChecker+Invalid, 851 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 830 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 18:27:16,697 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [199 Valid, 343 Invalid, 851 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 830 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 18:27:16,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2023-12-02 18:27:16,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 70. [2023-12-02 18:27:16,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 47 states have (on average 1.6382978723404256) internal successors, (77), 69 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) [2023-12-02 18:27:16,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 77 transitions. [2023-12-02 18:27:16,699 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 77 transitions. Word has length 21 [2023-12-02 18:27:16,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:27:16,699 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 77 transitions. [2023-12-02 18:27:16,699 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 1.90625) internal successors, (61), 33 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:27:16,699 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 77 transitions. [2023-12-02 18:27:16,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-12-02 18:27:16,700 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:27:16,700 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:27:16,706 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 18:27:16,900 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 18:27:16,900 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr19REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:27:16,901 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:27:16,901 INFO L85 PathProgramCache]: Analyzing trace with hash 1840084920, now seen corresponding path program 1 times [2023-12-02 18:27:16,901 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:27:16,901 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286934966] [2023-12-02 18:27:16,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:27:16,901 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:27:16,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:27:17,343 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:27:17,343 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:27:17,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [286934966] [2023-12-02 18:27:17,343 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [286934966] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:27:17,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1958253915] [2023-12-02 18:27:17,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:27:17,344 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:27:17,344 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:27:17,345 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:27:17,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 18:27:17,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:27:17,468 INFO L262 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 52 conjunts are in the unsatisfiable core [2023-12-02 18:27:17,470 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:27:17,521 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-12-02 18:27:17,522 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 13 [2023-12-02 18:27:17,582 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2023-12-02 18:27:17,668 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 27 treesize of output 19 [2023-12-02 18:27:17,727 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:27:17,727 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 31 [2023-12-02 18:27:17,744 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:27:17,744 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:27:17,811 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 28 treesize of output 20 [2023-12-02 18:27:17,865 INFO L349 Elim1Store]: treesize reduction 22, result has 37.1 percent of original size [2023-12-02 18:27:17,865 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 155 treesize of output 144 [2023-12-02 18:27:17,947 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:27:17,947 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1958253915] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:27:17,947 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1679317742] [2023-12-02 18:27:17,949 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 18:27:17,949 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:27:17,949 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:27:17,949 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:27:17,949 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:27:19,221 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:27:34,296 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2848#(and (<= 2 |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start_node_create_#res#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= 2 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (not (= (select |#valid| |ULTIMATE.start_sll_remove_last_~last~0#1.base|) 1)))' at error location [2023-12-02 18:27:34,297 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:27:34,297 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:27:34,297 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 25 [2023-12-02 18:27:34,297 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219907900] [2023-12-02 18:27:34,297 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:27:34,297 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-12-02 18:27:34,298 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:27:34,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-12-02 18:27:34,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1374, Unknown=3, NotChecked=0, Total=1560 [2023-12-02 18:27:34,299 INFO L87 Difference]: Start difference. First operand 70 states and 77 transitions. Second operand has 26 states, 25 states have (on average 2.4) internal successors, (60), 26 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:27:35,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:27:35,103 INFO L93 Difference]: Finished difference Result 81 states and 88 transitions. [2023-12-02 18:27:35,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 18:27:35,103 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.4) internal successors, (60), 26 states have internal predecessors, (60), 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 21 [2023-12-02 18:27:35,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:27:35,104 INFO L225 Difference]: With dead ends: 81 [2023-12-02 18:27:35,104 INFO L226 Difference]: Without dead ends: 81 [2023-12-02 18:27:35,105 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 608 ImplicationChecksByTransitivity, 15.9s TimeCoverageRelationStatistics Valid=356, Invalid=2397, Unknown=3, NotChecked=0, Total=2756 [2023-12-02 18:27:35,105 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 147 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 587 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 597 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 587 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 18:27:35,106 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [147 Valid, 251 Invalid, 597 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 587 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 18:27:35,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-12-02 18:27:35,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 70. [2023-12-02 18:27:35,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 47 states have (on average 1.6170212765957446) internal successors, (76), 69 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:27:35,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 76 transitions. [2023-12-02 18:27:35,107 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 76 transitions. Word has length 21 [2023-12-02 18:27:35,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:27:35,108 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 76 transitions. [2023-12-02 18:27:35,108 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.4) internal successors, (60), 26 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:27:35,108 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 76 transitions. [2023-12-02 18:27:35,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-12-02 18:27:35,108 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:27:35,109 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:27:35,113 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 18:27:35,309 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 18:27:35,309 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:27:35,309 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:27:35,309 INFO L85 PathProgramCache]: Analyzing trace with hash -1204916126, now seen corresponding path program 1 times [2023-12-02 18:27:35,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:27:35,310 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1792014598] [2023-12-02 18:27:35,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:27:35,310 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:27:35,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:27:35,402 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 18:27:35,402 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:27:35,402 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1792014598] [2023-12-02 18:27:35,402 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1792014598] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:27:35,402 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1130542091] [2023-12-02 18:27:35,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:27:35,403 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:27:35,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:27:35,404 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:27:35,409 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 18:27:35,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:27:35,530 INFO L262 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 18:27:35,532 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:27:35,541 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2023-12-02 18:27:35,549 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 18:27:35,549 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:27:35,568 INFO L349 Elim1Store]: treesize reduction 5, result has 58.3 percent of original size [2023-12-02 18:27:35,569 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 16 treesize of output 15 [2023-12-02 18:27:35,572 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 18:27:35,572 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1130542091] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:27:35,573 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1241975015] [2023-12-02 18:27:35,575 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 18:27:35,575 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:27:35,575 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:27:35,575 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:27:35,575 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:27:36,957 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:27:50,707 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3177#(and (<= 2 |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (<= 1 |#StackHeapBarrier|) (not (= (select |#valid| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|) 1)) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start_node_create_#res#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 4)) (<= 2 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-12-02 18:27:50,707 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:27:50,708 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:27:50,708 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 5 [2023-12-02 18:27:50,708 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636950273] [2023-12-02 18:27:50,708 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:27:50,708 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 18:27:50,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:27:50,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 18:27:50,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=311, Unknown=3, NotChecked=0, Total=380 [2023-12-02 18:27:50,709 INFO L87 Difference]: Start difference. First operand 70 states and 76 transitions. Second operand has 6 states, 5 states have (on average 3.6) internal successors, (18), 6 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:27:50,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:27:50,971 INFO L93 Difference]: Finished difference Result 75 states and 81 transitions. [2023-12-02 18:27:50,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 18:27:50,972 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 6 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 23 [2023-12-02 18:27:50,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:27:50,973 INFO L225 Difference]: With dead ends: 75 [2023-12-02 18:27:50,973 INFO L226 Difference]: Without dead ends: 75 [2023-12-02 18:27:50,973 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=96, Invalid=501, Unknown=3, NotChecked=0, Total=600 [2023-12-02 18:27:50,974 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 48 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:27:50,974 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 73 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:27:50,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2023-12-02 18:27:50,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2023-12-02 18:27:50,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 50 states have (on average 1.62) internal successors, (81), 72 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:27:50,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 81 transitions. [2023-12-02 18:27:50,976 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 81 transitions. Word has length 23 [2023-12-02 18:27:50,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:27:50,976 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 81 transitions. [2023-12-02 18:27:50,976 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 6 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:27:50,976 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 81 transitions. [2023-12-02 18:27:50,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-12-02 18:27:50,977 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:27:50,977 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:27:50,982 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 18:27:51,177 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 18:27:51,178 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr24REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:27:51,178 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:27:51,178 INFO L85 PathProgramCache]: Analyzing trace with hash -1204916125, now seen corresponding path program 1 times [2023-12-02 18:27:51,178 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:27:51,178 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285284957] [2023-12-02 18:27:51,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:27:51,178 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:27:51,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:27:51,473 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:27:51,473 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:27:51,474 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285284957] [2023-12-02 18:27:51,474 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [285284957] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:27:51,474 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [581320599] [2023-12-02 18:27:51,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:27:51,474 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:27:51,474 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:27:51,475 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:27:51,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 18:27:51,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:27:51,614 INFO L262 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 13 conjunts are in the unsatisfiable core [2023-12-02 18:27:51,616 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:27:51,660 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 23 treesize of output 15 [2023-12-02 18:27:51,662 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 19 treesize of output 11 [2023-12-02 18:27:51,730 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 18:27:51,730 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:27:51,815 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:27:51,816 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 27 [2023-12-02 18:27:51,854 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 18:27:51,854 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [581320599] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:27:51,854 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [115502510] [2023-12-02 18:27:51,856 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 18:27:51,856 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:27:51,857 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:27:51,857 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:27:51,857 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:27:53,277 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:28:18,098 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3498#(and (<= 2 |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (<= 1 |#StackHeapBarrier|) (or (< (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4) 0) (< (select |#length| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|) (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 8))) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start_node_create_#res#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 4)) (<= 2 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-12-02 18:28:18,098 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:28:18,099 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:28:18,099 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6] total 16 [2023-12-02 18:28:18,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272577721] [2023-12-02 18:28:18,099 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:28:18,099 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-12-02 18:28:18,099 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:28:18,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-12-02 18:28:18,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=801, Unknown=7, NotChecked=0, Total=930 [2023-12-02 18:28:18,100 INFO L87 Difference]: Start difference. First operand 73 states and 81 transitions. Second operand has 17 states, 16 states have (on average 2.5) internal successors, (40), 17 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:28:18,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:28:18,955 INFO L93 Difference]: Finished difference Result 83 states and 89 transitions. [2023-12-02 18:28:18,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-12-02 18:28:18,956 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.5) internal successors, (40), 17 states have internal predecessors, (40), 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 23 [2023-12-02 18:28:18,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:28:18,956 INFO L225 Difference]: With dead ends: 83 [2023-12-02 18:28:18,957 INFO L226 Difference]: Without dead ends: 83 [2023-12-02 18:28:18,957 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 518 ImplicationChecksByTransitivity, 25.6s TimeCoverageRelationStatistics Valid=315, Invalid=1934, Unknown=7, NotChecked=0, Total=2256 [2023-12-02 18:28:18,958 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 146 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 505 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 18:28:18,958 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 185 Invalid, 505 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 496 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 18:28:18,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2023-12-02 18:28:18,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 73. [2023-12-02 18:28:18,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 50 states have (on average 1.58) internal successors, (79), 72 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:28:18,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 79 transitions. [2023-12-02 18:28:18,961 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 79 transitions. Word has length 23 [2023-12-02 18:28:18,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:28:18,961 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 79 transitions. [2023-12-02 18:28:18,961 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.5) internal successors, (40), 17 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:28:18,962 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 79 transitions. [2023-12-02 18:28:18,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-12-02 18:28:18,962 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:28:18,962 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:28:18,967 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 18:28:19,163 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 18:28:19,163 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:28:19,163 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:28:19,163 INFO L85 PathProgramCache]: Analyzing trace with hash 1302309031, now seen corresponding path program 3 times [2023-12-02 18:28:19,163 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:28:19,164 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406719406] [2023-12-02 18:28:19,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:28:19,164 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:28:19,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:28:20,207 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:28:20,207 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:28:20,207 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406719406] [2023-12-02 18:28:20,207 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406719406] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:28:20,208 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [538215746] [2023-12-02 18:28:20,208 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 18:28:20,208 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:28:20,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:28:20,209 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:28:20,210 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 18:28:20,402 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 18:28:20,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 18:28:20,406 INFO L262 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 95 conjunts are in the unsatisfiable core [2023-12-02 18:28:20,409 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:28:20,440 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 18:28:20,445 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 18:28:20,548 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 18:28:20,551 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 18:28:20,558 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 18:28:20,603 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-12-02 18:28:20,604 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-12-02 18:28:20,659 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 18:28:20,666 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 18:28:20,684 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 18:28:20,691 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 18:28:20,739 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2023-12-02 18:28:20,749 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2023-12-02 18:28:21,267 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:28:21,267 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:28:21,743 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:28:21,743 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 110 treesize of output 93 [2023-12-02 18:28:21,750 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:28:21,750 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 78 [2023-12-02 18:28:21,766 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:28:21,766 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 110 treesize of output 98 [2023-12-02 18:28:21,771 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:28:21,772 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 95 treesize of output 78 [2023-12-02 18:28:22,360 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:28:22,360 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 112 treesize of output 82 [2023-12-02 18:28:22,369 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:28:22,369 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 82 treesize of output 62 [2023-12-02 18:28:22,428 INFO L349 Elim1Store]: treesize reduction 24, result has 66.7 percent of original size [2023-12-02 18:28:22,429 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 182 treesize of output 193 [2023-12-02 18:28:22,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 18:28:23,155 INFO L349 Elim1Store]: treesize reduction 165, result has 70.9 percent of original size [2023-12-02 18:28:23,156 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 0 disjoint index pairs (out of 55 index pairs), introduced 12 new quantified variables, introduced 54 case distinctions, treesize of input 404 treesize of output 703 [2023-12-02 18:28:23,332 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:28:23,332 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 266 treesize of output 316 [2023-12-02 18:28:23,421 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:28:23,421 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 372 treesize of output 324 [2023-12-02 18:28:40,960 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:28:40,961 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 112 treesize of output 72 [2023-12-02 18:28:40,970 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:28:40,970 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 72 treesize of output 62 [2023-12-02 18:28:41,316 INFO L349 Elim1Store]: treesize reduction 161, result has 64.3 percent of original size [2023-12-02 18:28:41,317 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 12 new quantified variables, introduced 28 case distinctions, treesize of input 336 treesize of output 502 [2023-12-02 18:28:41,437 INFO L349 Elim1Store]: treesize reduction 11, result has 84.7 percent of original size [2023-12-02 18:28:41,438 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 804 treesize of output 754 [2023-12-02 18:28:41,574 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:28:41,574 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 663 treesize of output 645 [2023-12-02 18:28:41,663 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:28:41,663 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 442 treesize of output 410 [2023-12-02 18:29:26,186 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:29:26,186 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [538215746] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:29:26,186 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [903668803] [2023-12-02 18:29:26,188 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 18:29:26,188 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:29:26,188 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:29:26,188 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:29:26,188 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:29:27,477 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:29:45,015 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3879#(and (<= 2 |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (<= 1 |#StackHeapBarrier|) (or (< (select |#length| |ULTIMATE.start_sll_remove_last_~last~0#1.base|) (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 8)) (< (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 4) 0)) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start_node_create_#res#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= 2 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-12-02 18:29:45,015 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:29:45,015 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:29:45,015 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 13] total 37 [2023-12-02 18:29:45,015 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396264682] [2023-12-02 18:29:45,015 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:29:45,015 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2023-12-02 18:29:45,015 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:29:45,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2023-12-02 18:29:45,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=2420, Unknown=33, NotChecked=0, Total=2652 [2023-12-02 18:29:45,017 INFO L87 Difference]: Start difference. First operand 73 states and 79 transitions. Second operand has 38 states, 38 states have (on average 1.736842105263158) internal successors, (66), 37 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:46,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:29:46,470 INFO L93 Difference]: Finished difference Result 95 states and 102 transitions. [2023-12-02 18:29:46,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 18:29:46,471 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.736842105263158) internal successors, (66), 37 states have internal predecessors, (66), 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 24 [2023-12-02 18:29:46,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:29:46,472 INFO L225 Difference]: With dead ends: 95 [2023-12-02 18:29:46,472 INFO L226 Difference]: Without dead ends: 95 [2023-12-02 18:29:46,473 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 870 ImplicationChecksByTransitivity, 19.9s TimeCoverageRelationStatistics Valid=280, Invalid=3107, Unknown=35, NotChecked=0, Total=3422 [2023-12-02 18:29:46,474 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 29 mSDsluCounter, 578 mSDsCounter, 0 mSdLazyCounter, 831 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 613 SdHoareTripleChecker+Invalid, 841 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 831 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 18:29:46,474 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 613 Invalid, 841 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 831 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 18:29:46,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2023-12-02 18:29:46,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 88. [2023-12-02 18:29:46,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 65 states have (on average 1.4615384615384615) internal successors, (95), 87 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:46,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 95 transitions. [2023-12-02 18:29:46,477 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 95 transitions. Word has length 24 [2023-12-02 18:29:46,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:29:46,477 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 95 transitions. [2023-12-02 18:29:46,477 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.736842105263158) internal successors, (66), 37 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:46,477 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 95 transitions. [2023-12-02 18:29:46,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-12-02 18:29:46,478 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:29:46,478 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:29:46,483 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 18:29:46,679 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 18:29:46,679 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr26ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:29:46,679 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:29:46,679 INFO L85 PathProgramCache]: Analyzing trace with hash 1716774978, now seen corresponding path program 1 times [2023-12-02 18:29:46,679 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:29:46,679 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826604317] [2023-12-02 18:29:46,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:29:46,680 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:29:46,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:29:47,321 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:29:47,321 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:29:47,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1826604317] [2023-12-02 18:29:47,322 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1826604317] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:29:47,322 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [497647053] [2023-12-02 18:29:47,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:29:47,322 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:29:47,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:29:47,324 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:29:47,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 18:29:47,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:29:47,467 INFO L262 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 49 conjunts are in the unsatisfiable core [2023-12-02 18:29:47,469 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:29:47,568 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 18:29:47,663 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2023-12-02 18:29:47,932 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 25 treesize of output 13 [2023-12-02 18:29:48,009 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 22 treesize of output 10 [2023-12-02 18:29:48,101 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 18:29:48,102 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 18:29:48,105 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:29:48,105 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 15 [2023-12-02 18:29:48,114 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:29:48,114 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:29:48,374 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 40 treesize of output 28 [2023-12-02 18:29:48,474 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:29:48,474 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 167 treesize of output 173 [2023-12-02 18:29:48,985 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:29:48,986 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [497647053] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:29:48,986 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1464219487] [2023-12-02 18:29:48,987 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-12-02 18:29:48,987 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:29:48,987 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:29:48,988 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:29:48,988 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:29:50,271 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:30:09,410 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4270#(and (<= 2 |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (<= 1 |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.offset_189| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_189| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base| (store (select |v_#memory_$Pointer$.offset_189| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|) (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4) 0)))) (= |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 0) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start_node_create_#res#1.offset| 0) (<= |#StackHeapBarrier| |ULTIMATE.start_sll_remove_last_~last~0#1.base|) (exists ((|v_#memory_$Pointer$.base_191| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_191| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base| (store (select |v_#memory_$Pointer$.base_191| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|) (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4) 0)) |#memory_$Pointer$.base|)) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (<= (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 8) (select |#length| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|)) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= 2 |ULTIMATE.start_sll_remove_last_~head#1.base|) (exists ((|v_#memory_int_171| (Array Int (Array Int Int)))) (= (store |v_#memory_int_171| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base| (store (select |v_#memory_int_171| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|) (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4) (select (select |#memory_int| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|) (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)))) |#memory_int|)) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= (select |#valid| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|) 1))' at error location [2023-12-02 18:30:09,410 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:30:09,410 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:30:09,410 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 13] total 35 [2023-12-02 18:30:09,411 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123859967] [2023-12-02 18:30:09,411 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:30:09,411 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-12-02 18:30:09,411 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:30:09,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-12-02 18:30:09,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=2383, Unknown=4, NotChecked=0, Total=2652 [2023-12-02 18:30:09,413 INFO L87 Difference]: Start difference. First operand 88 states and 95 transitions. Second operand has 36 states, 35 states have (on average 1.8) internal successors, (63), 36 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:30:10,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:30:10,899 INFO L93 Difference]: Finished difference Result 96 states and 104 transitions. [2023-12-02 18:30:10,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-12-02 18:30:10,900 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.8) internal successors, (63), 36 states have internal predecessors, (63), 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 25 [2023-12-02 18:30:10,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:30:10,900 INFO L225 Difference]: With dead ends: 96 [2023-12-02 18:30:10,900 INFO L226 Difference]: Without dead ends: 96 [2023-12-02 18:30:10,902 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 34 SyntacticMatches, 4 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 990 ImplicationChecksByTransitivity, 21.0s TimeCoverageRelationStatistics Valid=470, Invalid=3816, Unknown=4, NotChecked=0, Total=4290 [2023-12-02 18:30:10,903 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 183 mSDsluCounter, 541 mSDsCounter, 0 mSdLazyCounter, 796 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 573 SdHoareTripleChecker+Invalid, 807 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 796 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 18:30:10,903 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [183 Valid, 573 Invalid, 807 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 796 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 18:30:10,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2023-12-02 18:30:10,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 89. [2023-12-02 18:30:10,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 66 states have (on average 1.4545454545454546) internal successors, (96), 88 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:30:10,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2023-12-02 18:30:10,905 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 25 [2023-12-02 18:30:10,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:30:10,906 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2023-12-02 18:30:10,906 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 1.8) internal successors, (63), 36 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:30:10,906 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2023-12-02 18:30:10,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-12-02 18:30:10,907 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:30:10,907 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:30:10,912 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 18:30:11,107 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:30:11,108 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr28REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:30:11,108 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:30:11,108 INFO L85 PathProgramCache]: Analyzing trace with hash -838853721, now seen corresponding path program 1 times [2023-12-02 18:30:11,108 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:30:11,108 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1121081754] [2023-12-02 18:30:11,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:30:11,108 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:30:11,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:30:11,217 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 18:30:11,217 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:30:11,217 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1121081754] [2023-12-02 18:30:11,217 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1121081754] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:30:11,217 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [918306860] [2023-12-02 18:30:11,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:30:11,218 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:30:11,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:30:11,219 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:30:11,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 18:30:11,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:30:11,375 INFO L262 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 18:30:11,376 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:30:11,410 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 18:30:11,410 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:30:11,444 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 18:30:11,445 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [918306860] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:30:11,445 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1832258549] [2023-12-02 18:30:11,446 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-12-02 18:30:11,446 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:30:11,447 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:30:11,447 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:30:11,447 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:30:14,001 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:30:41,167 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4673#(and (<= 1 |#StackHeapBarrier|) (= (+ |ULTIMATE.start_main_~i~0#1| 1) 0) (= |ULTIMATE.start_node_create_#res#1.offset| 0) (exists ((|v_#valid_141| (Array Int Int)) (|v_#memory_$Pointer$.base_209| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_64| Int) (|v_#memory_$Pointer$.offset_207| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_remove_last_~last~0#1.base_83| Int) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_65| Int) (|v_#memory_int_189| (Array Int (Array Int Int)))) (and (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_209| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_64| (store (select |v_#memory_$Pointer$.base_209| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_64|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_65| 4) 0))) (<= (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_65| 8) (select |#length| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_64|)) (or (= (select |v_#valid_141| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_83|) 1) (= |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_83| 0)) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_207| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_64| (store (select |v_#memory_$Pointer$.offset_207| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_64|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_65| 4) 0))) (<= (+ |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_83| 1) |#StackHeapBarrier|) (= (store |v_#valid_141| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_83| 0) |#valid|) (<= 0 (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_65| 4)) (= (store |v_#memory_int_189| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_64| (store (select |v_#memory_int_189| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_64|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_65| 4) (select (select |#memory_int| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_64|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_65| 4)))) |#memory_int|) (= (select |v_#valid_141| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_64|) 1))) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (not (= (select |#valid| |ULTIMATE.start_main_~#s~0#1.base|) 1)) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-12-02 18:30:41,167 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:30:41,167 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:30:41,167 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 5 [2023-12-02 18:30:41,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814765604] [2023-12-02 18:30:41,167 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:30:41,168 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 18:30:41,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:30:41,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 18:30:41,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=541, Unknown=9, NotChecked=0, Total=650 [2023-12-02 18:30:41,169 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 5 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) [2023-12-02 18:30:41,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:30:41,287 INFO L93 Difference]: Finished difference Result 102 states and 110 transitions. [2023-12-02 18:30:41,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 18:30:41,288 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 5 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) Word has length 29 [2023-12-02 18:30:41,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:30:41,288 INFO L225 Difference]: With dead ends: 102 [2023-12-02 18:30:41,289 INFO L226 Difference]: Without dead ends: 102 [2023-12-02 18:30:41,289 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 64 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 27.3s TimeCoverageRelationStatistics Valid=122, Invalid=625, Unknown=9, NotChecked=0, Total=756 [2023-12-02 18:30:41,290 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 114 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 18:30:41,290 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 132 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 18:30:41,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2023-12-02 18:30:41,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 98. [2023-12-02 18:30:41,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 75 states have (on average 1.4666666666666666) internal successors, (110), 97 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:30:41,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 110 transitions. [2023-12-02 18:30:41,293 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 110 transitions. Word has length 29 [2023-12-02 18:30:41,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:30:41,294 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 110 transitions. [2023-12-02 18:30:41,294 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 5 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) [2023-12-02 18:30:41,294 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 110 transitions. [2023-12-02 18:30:41,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-12-02 18:30:41,294 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:30:41,295 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:30:41,300 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2023-12-02 18:30:41,495 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:30:41,495 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:30:41,495 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:30:41,495 INFO L85 PathProgramCache]: Analyzing trace with hash -838856883, now seen corresponding path program 1 times [2023-12-02 18:30:41,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:30:41,496 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2081835815] [2023-12-02 18:30:41,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:30:41,496 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:30:41,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:30:41,693 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 18:30:41,693 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:30:41,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2081835815] [2023-12-02 18:30:41,693 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2081835815] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:30:41,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [125491846] [2023-12-02 18:30:41,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:30:41,694 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:30:41,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:30:41,694 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:30:41,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 18:30:41,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:30:41,828 INFO L262 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 14 conjunts are in the unsatisfiable core [2023-12-02 18:30:41,829 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:30:41,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 18:30:41,903 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-12-02 18:30:41,907 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 18:30:41,907 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:30:41,970 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:30:41,970 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 16 treesize of output 20 [2023-12-02 18:30:42,005 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 18:30:42,005 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [125491846] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:30:42,005 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1500836470] [2023-12-02 18:30:42,007 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-12-02 18:30:42,007 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:30:42,007 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:30:42,007 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:30:42,007 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:30:44,249 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:31:07,895 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5079#(and (= |ULTIMATE.start_sll_remove_last_~head#1.base| |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (<= 2 |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (= |ULTIMATE.start_node_create_#res#1.offset| 0) (exists ((|v_#valid_153| (Array Int Int)) (|v_ULTIMATE.start_sll_remove_last_~last~0#1.base_103| Int) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_81| Int) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_85| Int)) (and (= (store |v_#valid_153| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_103| 0) |#valid|) (exists ((|v_#memory_int_207| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_207| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_81| (store (select |v_#memory_int_207| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_81|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_85| 4) (select (select |#memory_int| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_81|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_85| 4)))))) (= (select |v_#valid_153| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_81|) 1) (exists ((|v_#memory_$Pointer$.offset_225| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_225| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_81| (store (select |v_#memory_$Pointer$.offset_225| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_81|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_85| 4) 0)))) (<= (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_85| 8) (select |#length| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_81|)) (<= 0 (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_85| 4)) (exists ((|v_#memory_$Pointer$.base_227| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_227| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_81| (store (select |v_#memory_$Pointer$.base_227| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_81|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_85| 4) 0)) |#memory_$Pointer$.base|)) (or (= |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_103| 0) (= (select |v_#valid_153| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_103|) 1)) (<= (+ |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_103| 1) |#StackHeapBarrier|))) (not (= (select |#valid| |ULTIMATE.start_sll_remove_last_~head#1.base|) 1)) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_sll_remove_last_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-12-02 18:31:07,895 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:31:07,895 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:31:07,895 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6] total 12 [2023-12-02 18:31:07,895 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349548456] [2023-12-02 18:31:07,896 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:31:07,896 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 18:31:07,896 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:31:07,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 18:31:07,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=912, Unknown=6, NotChecked=0, Total=1056 [2023-12-02 18:31:07,897 INFO L87 Difference]: Start difference. First operand 98 states and 110 transitions. Second operand has 14 states, 13 states have (on average 4.076923076923077) internal successors, (53), 13 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:31:08,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:31:08,105 INFO L93 Difference]: Finished difference Result 94 states and 106 transitions. [2023-12-02 18:31:08,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 18:31:08,106 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 4.076923076923077) internal successors, (53), 13 states have internal predecessors, (53), 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 29 [2023-12-02 18:31:08,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:31:08,107 INFO L225 Difference]: With dead ends: 94 [2023-12-02 18:31:08,107 INFO L226 Difference]: Without dead ends: 94 [2023-12-02 18:31:08,107 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 23.8s TimeCoverageRelationStatistics Valid=166, Invalid=1018, Unknown=6, NotChecked=0, Total=1190 [2023-12-02 18:31:08,108 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 188 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:31:08,108 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [188 Valid, 48 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:31:08,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2023-12-02 18:31:08,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2023-12-02 18:31:08,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 75 states have (on average 1.4133333333333333) internal successors, (106), 93 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:31:08,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 106 transitions. [2023-12-02 18:31:08,112 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 106 transitions. Word has length 29 [2023-12-02 18:31:08,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:31:08,112 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 106 transitions. [2023-12-02 18:31:08,112 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 4.076923076923077) internal successors, (53), 13 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:31:08,112 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 106 transitions. [2023-12-02 18:31:08,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-12-02 18:31:08,113 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:31:08,113 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:31:08,119 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 18:31:08,313 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-12-02 18:31:08,313 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:31:08,314 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:31:08,314 INFO L85 PathProgramCache]: Analyzing trace with hash -838856882, now seen corresponding path program 1 times [2023-12-02 18:31:08,314 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:31:08,314 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1797607019] [2023-12-02 18:31:08,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:31:08,314 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:31:08,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:31:08,471 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 18:31:08,471 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:31:08,471 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1797607019] [2023-12-02 18:31:08,471 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1797607019] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:31:08,471 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [458699512] [2023-12-02 18:31:08,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:31:08,471 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:31:08,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:31:08,472 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:31:08,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 18:31:08,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:31:08,623 INFO L262 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 18:31:08,624 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:31:08,718 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 18:31:08,718 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:31:08,815 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:31:08,816 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 17 treesize of output 21 [2023-12-02 18:31:08,838 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 18:31:08,838 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [458699512] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:31:08,838 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [861364160] [2023-12-02 18:31:08,839 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-12-02 18:31:08,839 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:31:08,839 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:31:08,839 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:31:08,839 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:31:11,170 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:31:36,878 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5468#(and (= |ULTIMATE.start_sll_remove_last_~head#1.base| |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~i~0#1| 0) (exists ((|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_105| Int) (|v_#valid_164| (Array Int Int)) (|v_ULTIMATE.start_sll_remove_last_~last~0#1.base_122| Int) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_98| Int)) (and (<= (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_105| 8) (select |#length| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_98|)) (exists ((|v_#memory_$Pointer$.offset_244| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_244| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_98| (store (select |v_#memory_$Pointer$.offset_244| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_98|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_105| 4) 0)))) (<= 0 (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_105| 4)) (= (store |v_#valid_164| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_122| 0) |#valid|) (or (= |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_122| 0) (= (select |v_#valid_164| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_122|) 1)) (<= (+ |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_122| 1) |#StackHeapBarrier|) (= (select |v_#valid_164| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_98|) 1) (exists ((|v_#memory_$Pointer$.base_246| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_246| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_98| (store (select |v_#memory_$Pointer$.base_246| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_98|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_105| 4) 0)))) (exists ((|v_#memory_int_226| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_226| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_98| (store (select |v_#memory_int_226| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_98|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_105| 4) (select (select |#memory_int| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_98|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_105| 4)))))))) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (<= (select |#length| |ULTIMATE.start_sll_remove_last_~head#1.base|) 3) (= |ULTIMATE.start_node_create_#res#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= 2 |ULTIMATE.start_sll_remove_last_~head#1.base|) (= |ULTIMATE.start_sll_remove_last_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-12-02 18:31:36,878 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:31:36,878 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:31:36,878 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2023-12-02 18:31:36,878 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699940869] [2023-12-02 18:31:36,878 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:31:36,878 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-12-02 18:31:36,878 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:31:36,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-12-02 18:31:36,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=678, Unknown=9, NotChecked=0, Total=812 [2023-12-02 18:31:36,879 INFO L87 Difference]: Start difference. First operand 94 states and 106 transitions. Second operand has 10 states, 9 states have (on average 4.777777777777778) internal successors, (43), 9 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:31:36,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:31:36,936 INFO L93 Difference]: Finished difference Result 89 states and 101 transitions. [2023-12-02 18:31:36,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 18:31:36,937 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.777777777777778) internal successors, (43), 9 states have internal predecessors, (43), 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 29 [2023-12-02 18:31:36,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:31:36,937 INFO L225 Difference]: With dead ends: 89 [2023-12-02 18:31:36,938 INFO L226 Difference]: Without dead ends: 89 [2023-12-02 18:31:36,938 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 287 ImplicationChecksByTransitivity, 25.8s TimeCoverageRelationStatistics Valid=125, Invalid=678, Unknown=9, NotChecked=0, Total=812 [2023-12-02 18:31:36,938 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 110 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:31:36,939 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 36 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:31:36,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2023-12-02 18:31:36,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2023-12-02 18:31:36,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 75 states have (on average 1.3466666666666667) internal successors, (101), 88 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:31:36,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 101 transitions. [2023-12-02 18:31:36,941 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 101 transitions. Word has length 29 [2023-12-02 18:31:36,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:31:36,942 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 101 transitions. [2023-12-02 18:31:36,942 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.777777777777778) internal successors, (43), 9 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:31:36,942 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 101 transitions. [2023-12-02 18:31:36,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-12-02 18:31:36,942 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:31:36,942 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:31:36,947 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 18:31:37,142 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-12-02 18:31:37,143 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:31:37,143 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:31:37,143 INFO L85 PathProgramCache]: Analyzing trace with hash -815780242, now seen corresponding path program 4 times [2023-12-02 18:31:37,143 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:31:37,144 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395699468] [2023-12-02 18:31:37,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:31:37,144 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:31:37,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:31:37,237 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 18:31:37,237 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:31:37,237 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395699468] [2023-12-02 18:31:37,238 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1395699468] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:31:37,238 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [734363082] [2023-12-02 18:31:37,238 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 18:31:37,238 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:31:37,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:31:37,241 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:31:37,245 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 18:31:37,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:31:37,432 INFO L262 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 18:31:37,434 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:31:37,464 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 18:31:37,464 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 18:31:37,464 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [734363082] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:31:37,464 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 18:31:37,464 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 5 [2023-12-02 18:31:37,464 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324994833] [2023-12-02 18:31:37,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:31:37,465 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 18:31:37,465 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:31:37,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 18:31:37,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-12-02 18:31:37,465 INFO L87 Difference]: Start difference. First operand 89 states and 101 transitions. Second operand has 5 states, 5 states have (on average 5.2) internal successors, (26), 4 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:31:37,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:31:37,505 INFO L93 Difference]: Finished difference Result 68 states and 72 transitions. [2023-12-02 18:31:37,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 18:31:37,505 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 4 states have internal predecessors, (26), 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 29 [2023-12-02 18:31:37,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:31:37,505 INFO L225 Difference]: With dead ends: 68 [2023-12-02 18:31:37,505 INFO L226 Difference]: Without dead ends: 68 [2023-12-02 18:31:37,506 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-12-02 18:31:37,506 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 0 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 18:31:37,507 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 112 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 18:31:37,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2023-12-02 18:31:37,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2023-12-02 18:31:37,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 54 states have (on average 1.3333333333333333) internal successors, (72), 67 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:31:37,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 72 transitions. [2023-12-02 18:31:37,509 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 72 transitions. Word has length 29 [2023-12-02 18:31:37,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:31:37,510 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 72 transitions. [2023-12-02 18:31:37,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 4 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:31:37,510 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 72 transitions. [2023-12-02 18:31:37,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-12-02 18:31:37,510 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:31:37,511 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:31:37,517 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 18:31:37,716 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2023-12-02 18:31:37,717 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:31:37,717 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:31:37,717 INFO L85 PathProgramCache]: Analyzing trace with hash -234759577, now seen corresponding path program 1 times [2023-12-02 18:31:37,717 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:31:37,717 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164020619] [2023-12-02 18:31:37,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:31:37,717 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:31:37,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:31:38,658 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:31:38,659 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:31:38,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164020619] [2023-12-02 18:31:38,659 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [164020619] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:31:38,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1536901138] [2023-12-02 18:31:38,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:31:38,659 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:31:38,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:31:38,660 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:31:38,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 18:31:38,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:31:38,801 INFO L262 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 66 conjunts are in the unsatisfiable core [2023-12-02 18:31:38,803 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:31:39,073 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 18:31:39,606 INFO L349 Elim1Store]: treesize reduction 48, result has 32.4 percent of original size [2023-12-02 18:31:39,606 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 56 treesize of output 64 [2023-12-02 18:31:39,636 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-12-02 18:31:39,637 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 14 treesize of output 12 [2023-12-02 18:31:39,775 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-12-02 18:31:39,934 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:31:39,934 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 1 case distinctions, treesize of input 41 treesize of output 21 [2023-12-02 18:31:39,937 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:31:39,937 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:31:40,250 WARN L854 $PredicateComparison]: unable to prove that (and (or (forall ((v_subst_11 Int)) (not (= 0 (select (select |c_#memory_$Pointer$.base| v_subst_11) 4)))) (forall ((v_ArrVal_1452 (Array Int Int))) (= (select |c_#valid| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_remove_last_~last~0#1.base| v_ArrVal_1452) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)) 1))) (forall ((v_ArrVal_1452 (Array Int Int))) (not (= (select (select |c_#memory_$Pointer$.base| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_remove_last_~last~0#1.base| v_ArrVal_1452) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)) 4) 0)))) is different from false [2023-12-02 18:31:40,734 INFO L349 Elim1Store]: treesize reduction 73, result has 64.2 percent of original size [2023-12-02 18:31:40,734 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 11 case distinctions, treesize of input 331 treesize of output 357 [2023-12-02 18:31:40,899 INFO L349 Elim1Store]: treesize reduction 73, result has 53.5 percent of original size [2023-12-02 18:31:40,900 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 558 treesize of output 551 [2023-12-02 18:31:40,954 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 228 treesize of output 224 [2023-12-02 18:31:40,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 18:31:40,990 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:31:40,990 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 231 treesize of output 229 [2023-12-02 18:31:41,041 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:31:41,041 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 423 treesize of output 403 [2023-12-02 18:31:54,357 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2023-12-02 18:31:54,357 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1536901138] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:31:54,358 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2070141993] [2023-12-02 18:31:54,359 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-12-02 18:31:54,359 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:31:54,359 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:31:54,359 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:31:54,359 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:31:56,587 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:32:29,583 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6116#(and (= |ULTIMATE.start_sll_remove_last_~head#1.base| |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (= (select |#valid| |ULTIMATE.start_sll_remove_last_~head#1.base|) 1) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~i~0#1| 0) (not (= (select |#valid| |ULTIMATE.start_sll_remove_last_#t~mem6#1.base|) 1)) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (= |ULTIMATE.start_node_create_#res#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_sll_remove_last_#t~mem6#1.offset| (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_remove_last_~head#1.base|) 0)) (= |ULTIMATE.start_main_~len~0#1| 2) (exists ((|v_#valid_176| (Array Int Int)) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_115| Int) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_125| Int) (|v_ULTIMATE.start_sll_remove_last_~last~0#1.base_142| Int)) (and (<= (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_125| 8) (select |#length| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_115|)) (exists ((|v_#memory_$Pointer$.offset_263| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_263| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_115| (store (select |v_#memory_$Pointer$.offset_263| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_115|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_125| 4) 0)))) (exists ((|v_#memory_int_245| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_245| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_115| (store (select |v_#memory_int_245| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_115|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_125| 4) (select (select |#memory_int| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_115|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_125| 4)))))) (or (= (select |v_#valid_176| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_142|) 1) (= |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_142| 0)) (= (store |v_#valid_176| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_142| 0) |#valid|) (<= (+ |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_142| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.base_267| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_267| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_115| (store (select |v_#memory_$Pointer$.base_267| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_115|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_125| 4) 0)))) (<= 0 (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_125| 4)) (= (select |v_#valid_176| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_115|) 1))) (<= 2 |ULTIMATE.start_sll_remove_last_~head#1.base|) (= |ULTIMATE.start_sll_remove_last_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (<= 4 (select |#length| |ULTIMATE.start_sll_remove_last_~head#1.base|)) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_remove_last_~head#1.base|) 0) |ULTIMATE.start_sll_remove_last_#t~mem6#1.base|))' at error location [2023-12-02 18:32:29,583 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:32:29,583 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:32:29,583 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 49 [2023-12-02 18:32:29,583 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500814677] [2023-12-02 18:32:29,583 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:32:29,583 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-12-02 18:32:29,583 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:32:29,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-12-02 18:32:29,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=4402, Unknown=23, NotChecked=134, Total=4830 [2023-12-02 18:32:29,585 INFO L87 Difference]: Start difference. First operand 68 states and 72 transitions. Second operand has 51 states, 50 states have (on average 1.64) internal successors, (82), 50 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:32:34,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:32:34,258 INFO L93 Difference]: Finished difference Result 111 states and 120 transitions. [2023-12-02 18:32:34,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-12-02 18:32:34,259 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 1.64) internal successors, (82), 50 states have internal predecessors, (82), 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 30 [2023-12-02 18:32:34,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:32:34,260 INFO L225 Difference]: With dead ends: 111 [2023-12-02 18:32:34,261 INFO L226 Difference]: Without dead ends: 111 [2023-12-02 18:32:34,263 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2529 ImplicationChecksByTransitivity, 38.2s TimeCoverageRelationStatistics Valid=771, Invalid=8912, Unknown=23, NotChecked=194, Total=9900 [2023-12-02 18:32:34,264 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 434 mSDsluCounter, 345 mSDsCounter, 0 mSdLazyCounter, 1614 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 434 SdHoareTripleChecker+Valid, 361 SdHoareTripleChecker+Invalid, 1760 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 1614 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 111 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-12-02 18:32:34,264 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [434 Valid, 361 Invalid, 1760 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 1614 Invalid, 0 Unknown, 111 Unchecked, 1.4s Time] [2023-12-02 18:32:34,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2023-12-02 18:32:34,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 83. [2023-12-02 18:32:34,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 69 states have (on average 1.4057971014492754) internal successors, (97), 82 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:32:34,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 97 transitions. [2023-12-02 18:32:34,267 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 97 transitions. Word has length 30 [2023-12-02 18:32:34,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:32:34,267 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 97 transitions. [2023-12-02 18:32:34,268 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 50 states have (on average 1.64) internal successors, (82), 50 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:32:34,268 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 97 transitions. [2023-12-02 18:32:34,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-12-02 18:32:34,268 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:32:34,268 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:32:34,273 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 18:32:34,468 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2023-12-02 18:32:34,469 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:32:34,469 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:32:34,469 INFO L85 PathProgramCache]: Analyzing trace with hash -234759576, now seen corresponding path program 1 times [2023-12-02 18:32:34,469 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:32:34,469 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [246970194] [2023-12-02 18:32:34,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:32:34,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:32:34,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:32:34,915 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:32:34,915 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:32:34,915 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [246970194] [2023-12-02 18:32:34,915 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [246970194] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:32:34,916 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1253308586] [2023-12-02 18:32:34,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:32:34,916 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:32:34,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:32:34,917 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:32:34,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 18:32:35,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:32:35,062 INFO L262 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 51 conjunts are in the unsatisfiable core [2023-12-02 18:32:35,064 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:32:35,623 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2023-12-02 18:32:35,623 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 52 [2023-12-02 18:32:35,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 18:32:35,630 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 24 [2023-12-02 18:32:35,764 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 32 treesize of output 20 [2023-12-02 18:32:35,767 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 26 treesize of output 14 [2023-12-02 18:32:35,799 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:32:35,799 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:32:35,918 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_1553 (Array Int Int))) (<= 0 (+ 4 (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base| v_ArrVal_1553) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)))) (forall ((v_ArrVal_1553 (Array Int Int)) (v_ArrVal_1552 (Array Int Int))) (<= (+ 8 (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base| v_ArrVal_1553) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base| v_ArrVal_1552) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|))))) is different from false [2023-12-02 18:32:35,939 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_1553 (Array Int Int))) (<= 0 (+ (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_remove_last_~last~0#1.base| v_ArrVal_1553) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 4))) (forall ((v_ArrVal_1553 (Array Int Int)) (v_ArrVal_1552 (Array Int Int))) (<= (+ (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_remove_last_~last~0#1.base| v_ArrVal_1553) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 8) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_remove_last_~last~0#1.base| v_ArrVal_1552) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|))))) is different from false [2023-12-02 18:32:36,055 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:32:36,055 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 54 treesize of output 58 [2023-12-02 18:32:36,187 WARN L854 $PredicateComparison]: unable to prove that (let ((.cse0 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_remove_last_~head#1.base|) |c_ULTIMATE.start_sll_remove_last_~head#1.offset|))) (and (forall ((v_ArrVal_1553 (Array Int Int))) (<= 0 (+ (select (select (store |c_#memory_$Pointer$.offset| .cse0 v_ArrVal_1553) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 4))) (forall ((v_prenex_2 (Array Int Int))) (< (select (select (store |c_#memory_$Pointer$.offset| .cse0 v_prenex_2) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) (+ (select (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_remove_last_~head#1.base|) |c_ULTIMATE.start_sll_remove_last_~head#1.offset|) 1))) (forall ((v_ArrVal_1552 (Array Int Int))) (= .cse0 (select (select (store |c_#memory_$Pointer$.base| .cse0 v_ArrVal_1552) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|))))) is different from false [2023-12-02 18:32:36,197 WARN L854 $PredicateComparison]: unable to prove that (let ((.cse0 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|))) (and (forall ((v_ArrVal_1553 (Array Int Int))) (<= 0 (+ 4 (select (select (store |c_#memory_$Pointer$.offset| .cse0 v_ArrVal_1553) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)))) (forall ((v_prenex_2 (Array Int Int))) (< (select (select (store |c_#memory_$Pointer$.offset| .cse0 v_prenex_2) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) (+ (select (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 1))) (forall ((v_ArrVal_1552 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| .cse0 v_ArrVal_1552) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) .cse0)))) is different from false [2023-12-02 18:32:36,204 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 72 treesize of output 48 [2023-12-02 18:32:36,207 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 63 treesize of output 51 [2023-12-02 18:32:36,209 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 45 treesize of output 43 [2023-12-02 18:32:36,212 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 43 treesize of output 41 [2023-12-02 18:32:36,214 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 41 treesize of output 39 [2023-12-02 18:32:36,364 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 4 not checked. [2023-12-02 18:32:36,364 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1253308586] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:32:36,364 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [129894142] [2023-12-02 18:32:36,366 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-12-02 18:32:36,366 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:32:36,366 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:32:36,366 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:32:36,366 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:32:38,701 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:33:14,281 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6602#(and (<= 2 |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (<= 1 |#StackHeapBarrier|) (or (< (+ |ULTIMATE.start_sll_remove_last_#t~mem6#1.offset| 4) 0) (< (select |#length| |ULTIMATE.start_sll_remove_last_#t~mem6#1.base|) (+ |ULTIMATE.start_sll_remove_last_#t~mem6#1.offset| 8))) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (= |ULTIMATE.start_node_create_#res#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= 2 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= |ULTIMATE.start_main_~i~0#1| 1) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-12-02 18:33:14,281 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:33:14,281 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:33:14,281 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13, 13] total 37 [2023-12-02 18:33:14,281 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485916770] [2023-12-02 18:33:14,281 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:33:14,282 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2023-12-02 18:33:14,282 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:33:14,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2023-12-02 18:33:14,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=2635, Unknown=33, NotChecked=428, Total=3306 [2023-12-02 18:33:14,283 INFO L87 Difference]: Start difference. First operand 83 states and 97 transitions. Second operand has 39 states, 38 states have (on average 2.3684210526315788) internal successors, (90), 38 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:33:16,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:33:16,188 INFO L93 Difference]: Finished difference Result 111 states and 120 transitions. [2023-12-02 18:33:16,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 18:33:16,189 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 2.3684210526315788) internal successors, (90), 38 states have internal predecessors, (90), 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 30 [2023-12-02 18:33:16,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:33:16,190 INFO L225 Difference]: With dead ends: 111 [2023-12-02 18:33:16,190 INFO L226 Difference]: Without dead ends: 111 [2023-12-02 18:33:16,192 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 43 SyntacticMatches, 4 SemanticMatches, 69 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 1113 ImplicationChecksByTransitivity, 37.7s TimeCoverageRelationStatistics Valid=429, Invalid=3976, Unknown=33, NotChecked=532, Total=4970 [2023-12-02 18:33:16,193 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 342 mSDsluCounter, 389 mSDsCounter, 0 mSdLazyCounter, 838 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 342 SdHoareTripleChecker+Valid, 410 SdHoareTripleChecker+Invalid, 1236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 838 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 384 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 18:33:16,193 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [342 Valid, 410 Invalid, 1236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 838 Invalid, 0 Unknown, 384 Unchecked, 0.7s Time] [2023-12-02 18:33:16,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2023-12-02 18:33:16,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 83. [2023-12-02 18:33:16,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 69 states have (on average 1.391304347826087) internal successors, (96), 82 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:33:16,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 96 transitions. [2023-12-02 18:33:16,195 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 96 transitions. Word has length 30 [2023-12-02 18:33:16,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:33:16,195 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 96 transitions. [2023-12-02 18:33:16,195 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 2.3684210526315788) internal successors, (90), 38 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:33:16,195 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 96 transitions. [2023-12-02 18:33:16,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-12-02 18:33:16,195 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:33:16,196 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:33:16,200 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 18:33:16,396 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-12-02 18:33:16,396 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:33:16,397 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:33:16,397 INFO L85 PathProgramCache]: Analyzing trace with hash -1515759767, now seen corresponding path program 1 times [2023-12-02 18:33:16,397 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:33:16,397 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417682703] [2023-12-02 18:33:16,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:33:16,397 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:33:16,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:33:16,518 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 18:33:16,519 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:33:16,519 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [417682703] [2023-12-02 18:33:16,519 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [417682703] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:33:16,519 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:33:16,519 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 18:33:16,519 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459835399] [2023-12-02 18:33:16,519 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:33:16,519 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 18:33:16,520 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:33:16,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 18:33:16,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 18:33:16,520 INFO L87 Difference]: Start difference. First operand 83 states and 96 transitions. Second operand has 5 states, 4 states have (on average 6.5) internal successors, (26), 5 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:33:16,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:33:16,638 INFO L93 Difference]: Finished difference Result 83 states and 94 transitions. [2023-12-02 18:33:16,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 18:33:16,639 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.5) internal successors, (26), 5 states have internal predecessors, (26), 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 33 [2023-12-02 18:33:16,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:33:16,640 INFO L225 Difference]: With dead ends: 83 [2023-12-02 18:33:16,640 INFO L226 Difference]: Without dead ends: 83 [2023-12-02 18:33:16,640 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 18:33:16,640 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 32 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:33:16,641 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 54 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:33:16,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2023-12-02 18:33:16,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2023-12-02 18:33:16,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 69 states have (on average 1.3623188405797102) internal successors, (94), 82 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:33:16,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 94 transitions. [2023-12-02 18:33:16,642 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 94 transitions. Word has length 33 [2023-12-02 18:33:16,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:33:16,642 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 94 transitions. [2023-12-02 18:33:16,643 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.5) internal successors, (26), 5 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:33:16,643 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 94 transitions. [2023-12-02 18:33:16,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-12-02 18:33:16,643 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:33:16,643 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:33:16,643 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2023-12-02 18:33:16,643 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:33:16,643 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:33:16,644 INFO L85 PathProgramCache]: Analyzing trace with hash -1515775660, now seen corresponding path program 1 times [2023-12-02 18:33:16,644 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:33:16,644 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [670190528] [2023-12-02 18:33:16,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:33:16,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:33:16,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:33:16,976 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:33:16,976 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:33:16,976 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [670190528] [2023-12-02 18:33:16,976 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [670190528] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:33:16,976 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [119717939] [2023-12-02 18:33:16,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:33:16,977 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:33:16,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:33:16,977 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:33:16,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 18:33:17,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:33:17,127 INFO L262 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 52 conjunts are in the unsatisfiable core [2023-12-02 18:33:17,129 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:33:17,334 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2023-12-02 18:33:17,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 18:33:17,410 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 18:33:17,453 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:33:17,453 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:33:17,515 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1701 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_remove_last_~last~0#1.base| v_ArrVal_1701) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0)) is different from false [2023-12-02 18:33:17,521 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1701 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_remove_last_~head#1.base|) |c_ULTIMATE.start_sll_remove_last_~head#1.offset|) v_ArrVal_1701) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0)) is different from false [2023-12-02 18:33:17,532 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1701 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) v_ArrVal_1701) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0)) is different from false [2023-12-02 18:33:17,537 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 23 treesize of output 15 [2023-12-02 18:33:17,539 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 30 treesize of output 22 [2023-12-02 18:33:17,542 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 18:33:17,632 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 6 not checked. [2023-12-02 18:33:17,632 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [119717939] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:33:17,632 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [708762097] [2023-12-02 18:33:17,634 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-12-02 18:33:17,634 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:33:17,634 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:33:17,634 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:33:17,634 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:33:19,863 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:33:53,118 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7243#(and (= (select |#valid| |ULTIMATE.start_sll_remove_last_~head#1.base|) 1) (<= 2 |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (<= 1 |#StackHeapBarrier|) (not (= |ULTIMATE.start_sll_remove_last_#t~mem8#1.offset| 0)) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_remove_last_~head#1.base|) 0) |ULTIMATE.start_sll_remove_last_#t~mem8#1.base|) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (= |ULTIMATE.start_node_create_#res#1.offset| 0) (= |ULTIMATE.start_sll_remove_last_#t~mem8#1.offset| (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_remove_last_~head#1.base|) 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= 2 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= 4 (select |#length| |ULTIMATE.start_sll_remove_last_~head#1.base|)) (<= |ULTIMATE.start_main_~i~0#1| 1) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-12-02 18:33:53,118 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:33:53,119 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:33:53,119 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 28 [2023-12-02 18:33:53,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508873913] [2023-12-02 18:33:53,119 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:33:53,119 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-12-02 18:33:53,119 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:33:53,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-12-02 18:33:53,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=2003, Unknown=38, NotChecked=282, Total=2550 [2023-12-02 18:33:53,121 INFO L87 Difference]: Start difference. First operand 83 states and 94 transitions. Second operand has 30 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 29 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:33:54,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:33:54,535 INFO L93 Difference]: Finished difference Result 141 states and 158 transitions. [2023-12-02 18:33:54,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-12-02 18:33:54,536 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 29 states have internal predecessors, (88), 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 33 [2023-12-02 18:33:54,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:33:54,537 INFO L225 Difference]: With dead ends: 141 [2023-12-02 18:33:54,537 INFO L226 Difference]: Without dead ends: 141 [2023-12-02 18:33:54,538 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 1228 ImplicationChecksByTransitivity, 34.6s TimeCoverageRelationStatistics Valid=553, Invalid=3977, Unknown=38, NotChecked=402, Total=4970 [2023-12-02 18:33:54,539 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 333 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 619 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 333 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 1005 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 619 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 344 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 18:33:54,539 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [333 Valid, 296 Invalid, 1005 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 619 Invalid, 0 Unknown, 344 Unchecked, 0.4s Time] [2023-12-02 18:33:54,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2023-12-02 18:33:54,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 83. [2023-12-02 18:33:54,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 70 states have (on average 1.3428571428571427) internal successors, (94), 82 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:33:54,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 94 transitions. [2023-12-02 18:33:54,541 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 94 transitions. Word has length 33 [2023-12-02 18:33:54,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:33:54,542 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 94 transitions. [2023-12-02 18:33:54,542 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 29 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:33:54,542 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 94 transitions. [2023-12-02 18:33:54,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-12-02 18:33:54,542 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:33:54,542 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:33:54,548 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2023-12-02 18:33:54,742 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:33:54,743 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:33:54,743 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:33:54,743 INFO L85 PathProgramCache]: Analyzing trace with hash 255594888, now seen corresponding path program 1 times [2023-12-02 18:33:54,743 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:33:54,743 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008875814] [2023-12-02 18:33:54,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:33:54,744 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:33:54,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:33:55,047 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:33:55,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:33:55,047 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008875814] [2023-12-02 18:33:55,047 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1008875814] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:33:55,047 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1174387909] [2023-12-02 18:33:55,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:33:55,048 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:33:55,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:33:55,048 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:33:55,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 18:33:55,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:33:55,220 INFO L262 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 39 conjunts are in the unsatisfiable core [2023-12-02 18:33:55,222 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:33:55,609 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2023-12-02 18:33:55,609 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 27 [2023-12-02 18:33:55,700 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2023-12-02 18:33:55,704 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 18:33:55,705 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:33:55,816 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1800 (Array Int Int))) (< (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_remove_last_~last~0#1.base| v_ArrVal_1800) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) |c_#StackHeapBarrier|)) is different from false [2023-12-02 18:33:55,978 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 38 treesize of output 22 [2023-12-02 18:33:55,983 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 [2023-12-02 18:33:56,030 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 2 not checked. [2023-12-02 18:33:56,030 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1174387909] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:33:56,030 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [249778470] [2023-12-02 18:33:56,031 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-12-02 18:33:56,031 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:33:56,032 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:33:56,032 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:33:56,032 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:33:58,238 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:34:29,253 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7756#(and (= (select |#valid| |ULTIMATE.start_sll_remove_last_~head#1.base|) 1) (<= 2 |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (<= 1 |#StackHeapBarrier|) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_remove_last_~head#1.base|) 0) |ULTIMATE.start_sll_remove_last_#t~mem8#1.base|) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (= |ULTIMATE.start_node_create_#res#1.offset| 0) (= |ULTIMATE.start_sll_remove_last_#t~mem8#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (<= |#StackHeapBarrier| |ULTIMATE.start_sll_remove_last_#t~mem8#1.base|) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= 2 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= 4 (select |#length| |ULTIMATE.start_sll_remove_last_~head#1.base|)) (<= |ULTIMATE.start_main_~i~0#1| 1) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_remove_last_~head#1.base|) 0) 0))' at error location [2023-12-02 18:34:29,254 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:34:29,254 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:34:29,254 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 11] total 25 [2023-12-02 18:34:29,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814891602] [2023-12-02 18:34:29,254 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:34:29,254 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-12-02 18:34:29,254 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:34:29,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-12-02 18:34:29,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=1993, Unknown=46, NotChecked=92, Total=2352 [2023-12-02 18:34:29,255 INFO L87 Difference]: Start difference. First operand 83 states and 94 transitions. Second operand has 27 states, 26 states have (on average 3.269230769230769) internal successors, (85), 26 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:34:29,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:34:29,957 INFO L93 Difference]: Finished difference Result 108 states and 116 transitions. [2023-12-02 18:34:29,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-12-02 18:34:29,957 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 3.269230769230769) internal successors, (85), 26 states have internal predecessors, (85), 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 34 [2023-12-02 18:34:29,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:34:29,958 INFO L225 Difference]: With dead ends: 108 [2023-12-02 18:34:29,958 INFO L226 Difference]: Without dead ends: 108 [2023-12-02 18:34:29,958 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 56 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 922 ImplicationChecksByTransitivity, 31.9s TimeCoverageRelationStatistics Valid=352, Invalid=2798, Unknown=46, NotChecked=110, Total=3306 [2023-12-02 18:34:29,958 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 188 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 474 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 574 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 91 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 18:34:29,959 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [188 Valid, 239 Invalid, 574 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 474 Invalid, 0 Unknown, 91 Unchecked, 0.3s Time] [2023-12-02 18:34:29,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2023-12-02 18:34:29,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 86. [2023-12-02 18:34:29,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 73 states have (on average 1.3287671232876712) internal successors, (97), 85 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:34:29,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 97 transitions. [2023-12-02 18:34:29,961 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 97 transitions. Word has length 34 [2023-12-02 18:34:29,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:34:29,961 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 97 transitions. [2023-12-02 18:34:29,961 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 3.269230769230769) internal successors, (85), 26 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:34:29,961 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 97 transitions. [2023-12-02 18:34:29,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-12-02 18:34:29,961 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:34:29,962 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:34:29,967 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2023-12-02 18:34:30,162 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-12-02 18:34:30,162 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:34:30,162 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:34:30,163 INFO L85 PathProgramCache]: Analyzing trace with hash -651221998, now seen corresponding path program 1 times [2023-12-02 18:34:30,163 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:34:30,163 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223331535] [2023-12-02 18:34:30,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:34:30,163 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:34:30,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:34:30,819 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:34:30,819 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:34:30,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223331535] [2023-12-02 18:34:30,819 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1223331535] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:34:30,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1172023316] [2023-12-02 18:34:30,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:34:30,819 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:34:30,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:34:30,821 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:34:30,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 18:34:31,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:34:31,032 INFO L262 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 21 conjunts are in the unsatisfiable core [2023-12-02 18:34:31,034 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:34:31,279 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:34:31,279 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 77 treesize of output 140 [2023-12-02 18:34:31,337 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:34:31,338 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 103 treesize of output 150 [2023-12-02 18:34:32,877 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 18:34:32,877 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 18:34:32,878 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1172023316] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:34:32,878 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 18:34:32,878 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [16] total 21 [2023-12-02 18:34:32,878 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849384193] [2023-12-02 18:34:32,878 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:34:32,879 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 18:34:32,879 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:34:32,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 18:34:32,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=369, Unknown=0, NotChecked=0, Total=420 [2023-12-02 18:34:32,879 INFO L87 Difference]: Start difference. First operand 86 states and 97 transitions. Second operand has 7 states, 7 states have (on average 4.0) internal successors, (28), 7 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) [2023-12-02 18:34:33,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:34:33,157 INFO L93 Difference]: Finished difference Result 83 states and 92 transitions. [2023-12-02 18:34:33,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 18:34:33,158 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 7 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) Word has length 35 [2023-12-02 18:34:33,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:34:33,158 INFO L225 Difference]: With dead ends: 83 [2023-12-02 18:34:33,158 INFO L226 Difference]: Without dead ends: 83 [2023-12-02 18:34:33,158 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2023-12-02 18:34:33,159 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 15 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 18:34:33,159 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 117 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 18:34:33,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2023-12-02 18:34:33,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2023-12-02 18:34:33,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 71 states have (on average 1.2816901408450705) internal successors, (91), 81 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:34:33,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 91 transitions. [2023-12-02 18:34:33,161 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 91 transitions. Word has length 35 [2023-12-02 18:34:33,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:34:33,161 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 91 transitions. [2023-12-02 18:34:33,161 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 7 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) [2023-12-02 18:34:33,161 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 91 transitions. [2023-12-02 18:34:33,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-12-02 18:34:33,162 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:34:33,162 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:34:33,167 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2023-12-02 18:34:33,362 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-12-02 18:34:33,362 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:34:33,363 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:34:33,363 INFO L85 PathProgramCache]: Analyzing trace with hash -666492970, now seen corresponding path program 1 times [2023-12-02 18:34:33,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:34:33,363 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337127775] [2023-12-02 18:34:33,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:34:33,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:34:33,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:34:33,435 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 18:34:33,435 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:34:33,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337127775] [2023-12-02 18:34:33,435 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1337127775] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:34:33,436 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:34:33,436 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 18:34:33,436 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318017945] [2023-12-02 18:34:33,436 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:34:33,436 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 18:34:33,436 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:34:33,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 18:34:33,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 18:34:33,437 INFO L87 Difference]: Start difference. First operand 82 states and 91 transitions. Second operand has 5 states, 4 states have (on average 7.0) internal successors, (28), 5 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) [2023-12-02 18:34:33,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:34:33,517 INFO L93 Difference]: Finished difference Result 81 states and 90 transitions. [2023-12-02 18:34:33,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 18:34:33,517 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 7.0) internal successors, (28), 5 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) Word has length 35 [2023-12-02 18:34:33,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:34:33,518 INFO L225 Difference]: With dead ends: 81 [2023-12-02 18:34:33,518 INFO L226 Difference]: Without dead ends: 81 [2023-12-02 18:34:33,518 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 18:34:33,518 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 16 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:34:33,519 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 57 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:34:33,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-12-02 18:34:33,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2023-12-02 18:34:33,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 71 states have (on average 1.267605633802817) internal successors, (90), 80 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:34:33,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 90 transitions. [2023-12-02 18:34:33,520 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 90 transitions. Word has length 35 [2023-12-02 18:34:33,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:34:33,520 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 90 transitions. [2023-12-02 18:34:33,521 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 7.0) internal successors, (28), 5 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) [2023-12-02 18:34:33,521 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 90 transitions. [2023-12-02 18:34:33,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-12-02 18:34:33,521 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:34:33,521 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:34:33,521 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2023-12-02 18:34:33,521 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:34:33,521 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:34:33,522 INFO L85 PathProgramCache]: Analyzing trace with hash 1286957815, now seen corresponding path program 2 times [2023-12-02 18:34:33,522 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:34:33,522 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583217303] [2023-12-02 18:34:33,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:34:33,522 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:34:33,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:34:34,220 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:34:34,220 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:34:34,220 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1583217303] [2023-12-02 18:34:34,221 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1583217303] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:34:34,221 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1245886590] [2023-12-02 18:34:34,221 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 18:34:34,221 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:34:34,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:34:34,222 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:34:34,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-12-02 18:34:34,444 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 18:34:34,444 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 18:34:34,447 INFO L262 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 67 conjunts are in the unsatisfiable core [2023-12-02 18:34:34,449 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:34:34,751 INFO L349 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2023-12-02 18:34:34,751 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 46 [2023-12-02 18:34:34,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 18:34:34,757 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 37 [2023-12-02 18:34:35,027 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 5 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:34:35,027 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:34:35,532 INFO L349 Elim1Store]: treesize reduction 14, result has 54.8 percent of original size [2023-12-02 18:34:35,532 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 423 treesize of output 311 [2023-12-02 18:34:35,563 INFO L349 Elim1Store]: treesize reduction 12, result has 52.0 percent of original size [2023-12-02 18:34:35,563 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 319 treesize of output 283 [2023-12-02 18:34:35,710 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 18:34:35,711 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 58 treesize of output 56 [2023-12-02 18:34:35,998 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 5 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:34:35,999 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1245886590] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:34:35,999 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1335059066] [2023-12-02 18:34:36,000 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-12-02 18:34:36,000 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:34:36,000 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:34:36,001 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:34:36,001 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:34:38,441 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:35:16,958 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8704#(and (<= 2 |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (<= 1 |#StackHeapBarrier|) (or (< (select |#length| |ULTIMATE.start_sll_remove_last_~last~0#1.base|) (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 8)) (< (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 4) 0)) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (= |ULTIMATE.start_node_create_#res#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (or (and (= (select |#valid| |ULTIMATE.start_sll_remove_last_~head#1.base|) 1) (= |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 0) (= |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base| 0) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_remove_last_~head#1.base|) 0) |ULTIMATE.start_sll_remove_last_~last~0#1.base|) (= |ULTIMATE.start_sll_remove_last_~last~0#1.offset| (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_remove_last_~head#1.base|) 0)) (<= 4 (select |#length| |ULTIMATE.start_sll_remove_last_~head#1.base|))) (exists ((|v_ULTIMATE.start_sll_remove_last_~last~0#1.base_223| Int) (|v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_224| Int)) (and (= (select |#valid| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_223|) 1) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_223|) (+ |v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_224| 4)) |ULTIMATE.start_sll_remove_last_~last~0#1.base|) (= |ULTIMATE.start_sll_remove_last_~last~0#1.offset| (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_223|) (+ |v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_224| 4))) (<= 0 (+ |v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_224| 4)) (<= (+ |v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_224| 8) (select |#length| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_223|))))) (<= 2 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) (<= |ULTIMATE.start_main_~i~0#1| 1) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-12-02 18:35:16,958 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:35:16,958 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:35:16,958 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 37 [2023-12-02 18:35:16,958 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35066936] [2023-12-02 18:35:16,958 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:35:16,958 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2023-12-02 18:35:16,958 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:35:16,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2023-12-02 18:35:16,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=2965, Unknown=13, NotChecked=0, Total=3192 [2023-12-02 18:35:16,959 INFO L87 Difference]: Start difference. First operand 81 states and 90 transitions. Second operand has 38 states, 38 states have (on average 2.710526315789474) internal successors, (103), 37 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:35:22,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:35:22,160 INFO L93 Difference]: Finished difference Result 109 states and 113 transitions. [2023-12-02 18:35:22,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2023-12-02 18:35:22,160 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.710526315789474) internal successors, (103), 37 states have internal predecessors, (103), 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 36 [2023-12-02 18:35:22,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:35:22,161 INFO L225 Difference]: With dead ends: 109 [2023-12-02 18:35:22,161 INFO L226 Difference]: Without dead ends: 103 [2023-12-02 18:35:22,162 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1619 ImplicationChecksByTransitivity, 43.7s TimeCoverageRelationStatistics Valid=767, Invalid=6530, Unknown=13, NotChecked=0, Total=7310 [2023-12-02 18:35:22,162 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 361 mSDsluCounter, 399 mSDsCounter, 0 mSdLazyCounter, 904 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 361 SdHoareTripleChecker+Valid, 420 SdHoareTripleChecker+Invalid, 924 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 904 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-12-02 18:35:22,162 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [361 Valid, 420 Invalid, 924 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 904 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-12-02 18:35:22,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2023-12-02 18:35:22,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 81. [2023-12-02 18:35:22,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 71 states have (on average 1.2816901408450705) internal successors, (91), 80 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:35:22,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 91 transitions. [2023-12-02 18:35:22,170 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 91 transitions. Word has length 36 [2023-12-02 18:35:22,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:35:22,170 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 91 transitions. [2023-12-02 18:35:22,171 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.710526315789474) internal successors, (103), 37 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:35:22,171 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 91 transitions. [2023-12-02 18:35:22,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-12-02 18:35:22,171 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:35:22,171 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:35:22,176 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2023-12-02 18:35:22,371 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2023-12-02 18:35:22,372 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:35:22,372 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:35:22,372 INFO L85 PathProgramCache]: Analyzing trace with hash 813554507, now seen corresponding path program 1 times [2023-12-02 18:35:22,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:35:22,372 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1338938875] [2023-12-02 18:35:22,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:35:22,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:35:22,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:35:22,494 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 18:35:22,494 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:35:22,494 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1338938875] [2023-12-02 18:35:22,494 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1338938875] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:35:22,494 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2124082567] [2023-12-02 18:35:22,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:35:22,494 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:35:22,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:35:22,495 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:35:22,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-12-02 18:35:22,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:35:22,665 INFO L262 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 18:35:22,666 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:35:22,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 18:35:22,750 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-12-02 18:35:22,752 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 18:35:22,752 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:35:22,805 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 6 treesize of output 4 [2023-12-02 18:35:22,870 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 18:35:22,871 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2124082567] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:35:22,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [962380818] [2023-12-02 18:35:22,872 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 18:35:22,872 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:35:22,872 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:35:22,872 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:35:22,873 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:35:25,439 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:36:41,207 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9193#(and (= 0 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_remove_last_~head#1.base|) |ULTIMATE.start_sll_remove_last_~head#1.offset|)) (<= (+ |ULTIMATE.start_sll_remove_last_~head#1.offset| 4) (select |#length| |ULTIMATE.start_sll_remove_last_~head#1.base|)) (<= (+ (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_remove_last_~head#1.base|) |ULTIMATE.start_sll_remove_last_~head#1.offset|) 1) |#StackHeapBarrier|) (<= 1 |ULTIMATE.start_main_~len~0#1|) (not (= (select |#valid| |ULTIMATE.start_sll_remove_last_~head#1.base|) 1)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (exists ((|v_#valid_234| (Array Int Int)) (|v_ULTIMATE.start_sll_remove_last_#t~mem6#1.base_136| Int) (|v_ULTIMATE.start_sll_remove_last_#t~mem6#1.offset_137| Int)) (and (or (and (= |ULTIMATE.start_sll_remove_last_~head#1.base| |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_remove_last_~head#1.base|) |ULTIMATE.start_sll_remove_last_~head#1.offset|) |v_ULTIMATE.start_sll_remove_last_#t~mem6#1.base_136|) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_remove_last_#t~mem6#1.base_136|) 4) 0) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| |ULTIMATE.start_main_~#s~0#1.offset|) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) |ULTIMATE.start_sll_create_#res#1.offset|) (<= 8 (select |#length| |v_ULTIMATE.start_sll_remove_last_#t~mem6#1.base_136|)) (exists ((|v_ULTIMATE.start_sll_create_#in~len#1_48| Int) (|v_ULTIMATE.start_sll_create_~data#1_50| Int) (|v_ULTIMATE.start_sll_create_#in~data#1_48| Int)) (and (= |v_ULTIMATE.start_sll_create_#in~data#1_48| 1) (= 2 |v_ULTIMATE.start_sll_create_#in~len#1_48|) (= |ULTIMATE.start_main_~data~0#1| 1) (= |v_ULTIMATE.start_sll_create_~data#1_50| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| |ULTIMATE.start_sll_remove_last_~head#1.offset|) (= |v_ULTIMATE.start_sll_remove_last_#t~mem6#1.offset_137| 0) (= |ULTIMATE.start_sll_remove_last_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_sll_remove_last_#t~mem6#1.base_136|) 4) 0) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) |ULTIMATE.start_sll_create_#res#1.base|) (= |ULTIMATE.start_main_~len~0#1| (+ |ULTIMATE.start_main_~i~0#1| 1))) (and (= |ULTIMATE.start_sll_remove_last_~head#1.base| |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_remove_last_~head#1.base|) |ULTIMATE.start_sll_remove_last_~head#1.offset|) |v_ULTIMATE.start_sll_remove_last_#t~mem6#1.base_136|) (exists ((|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_224| Int) (|v_ULTIMATE.start_sll_remove_last_~last~0#1.base_236| Int) (|v_#valid_233| (Array Int Int)) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_199| Int) (|v_#memory_$Pointer$.base_368| (Array Int (Array Int Int))) (|v_#memory_int_343| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_364| (Array Int (Array Int Int)))) (and (<= (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_224| 8) (select |#length| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_199|)) (<= 0 (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_224| 4)) (= (select |v_#valid_233| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_199|) 1) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_364| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_199| (store (select |v_#memory_$Pointer$.offset_364| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_199|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_224| 4) 0))) (= (store |v_#memory_$Pointer$.base_368| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_199| (store (select |v_#memory_$Pointer$.base_368| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_199|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_224| 4) 0)) |#memory_$Pointer$.base|) (or (= |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_236| 0) (= (select |v_#valid_233| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_236|) 1)) (<= (+ |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_236| 1) |#StackHeapBarrier|) (= (store |v_#valid_233| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_236| 0) |v_#valid_234|) (= |#memory_int| (store |v_#memory_int_343| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_199| (store (select |v_#memory_int_343| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_199|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_224| 4) (select (select |#memory_int| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_199|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_224| 4))))))) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_remove_last_#t~mem6#1.base_136|) 4) 0) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| |ULTIMATE.start_main_~#s~0#1.offset|) (<= 8 (select |#length| |v_ULTIMATE.start_sll_remove_last_#t~mem6#1.base_136|)) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| |ULTIMATE.start_sll_remove_last_~head#1.offset|) (= |v_ULTIMATE.start_sll_remove_last_#t~mem6#1.offset_137| 0) (= |ULTIMATE.start_sll_remove_last_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_sll_remove_last_#t~mem6#1.base_136|) 4) 0))) (= |#valid| (store |v_#valid_234| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_remove_last_~head#1.base|) |ULTIMATE.start_sll_remove_last_~head#1.offset|) 0)) (= (select |v_#valid_234| |ULTIMATE.start_sll_remove_last_~head#1.base|) 1))) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|))' at error location [2023-12-02 18:36:41,207 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:36:41,207 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:36:41,207 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 10 [2023-12-02 18:36:41,208 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015699254] [2023-12-02 18:36:41,208 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:36:41,208 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-12-02 18:36:41,208 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:36:41,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-12-02 18:36:41,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=982, Unknown=32, NotChecked=0, Total=1122 [2023-12-02 18:36:41,209 INFO L87 Difference]: Start difference. First operand 81 states and 91 transitions. Second operand has 12 states, 11 states have (on average 5.636363636363637) internal successors, (62), 11 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:41,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:36:41,416 INFO L93 Difference]: Finished difference Result 81 states and 91 transitions. [2023-12-02 18:36:41,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 18:36:41,417 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 5.636363636363637) internal successors, (62), 11 states have internal predecessors, (62), 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 36 [2023-12-02 18:36:41,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:36:41,417 INFO L225 Difference]: With dead ends: 81 [2023-12-02 18:36:41,418 INFO L226 Difference]: Without dead ends: 81 [2023-12-02 18:36:41,418 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 75.9s TimeCoverageRelationStatistics Valid=139, Invalid=1161, Unknown=32, NotChecked=0, Total=1332 [2023-12-02 18:36:41,418 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 37 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:36:41,419 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 50 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:36:41,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-12-02 18:36:41,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2023-12-02 18:36:41,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 71 states have (on average 1.267605633802817) internal successors, (90), 79 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:41,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 90 transitions. [2023-12-02 18:36:41,421 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 90 transitions. Word has length 36 [2023-12-02 18:36:41,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:36:41,421 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 90 transitions. [2023-12-02 18:36:41,422 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 5.636363636363637) internal successors, (62), 11 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:41,422 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 90 transitions. [2023-12-02 18:36:41,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-12-02 18:36:41,422 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:36:41,422 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:36:41,427 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2023-12-02 18:36:41,622 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2023-12-02 18:36:41,623 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:36:41,623 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:36:41,623 INFO L85 PathProgramCache]: Analyzing trace with hash -1133776593, now seen corresponding path program 1 times [2023-12-02 18:36:41,623 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:36:41,623 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1859877569] [2023-12-02 18:36:41,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:36:41,623 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:36:41,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:36:41,724 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 11 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 18:36:41,724 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:36:41,724 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1859877569] [2023-12-02 18:36:41,724 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1859877569] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:36:41,724 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914282605] [2023-12-02 18:36:41,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:36:41,724 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:36:41,724 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:36:41,725 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:36:41,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-12-02 18:36:41,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:36:41,908 INFO L262 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 18:36:41,909 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:36:41,959 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 18:36:41,960 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 18:36:41,960 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1914282605] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:36:41,960 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 18:36:41,960 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 6 [2023-12-02 18:36:41,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224818897] [2023-12-02 18:36:41,960 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:36:41,961 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 18:36:41,961 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:36:41,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 18:36:41,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 18:36:41,961 INFO L87 Difference]: Start difference. First operand 80 states and 90 transitions. Second operand has 6 states, 6 states have (on average 5.666666666666667) internal successors, (34), 5 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) [2023-12-02 18:36:42,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:36:42,007 INFO L93 Difference]: Finished difference Result 45 states and 44 transitions. [2023-12-02 18:36:42,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 18:36:42,008 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.666666666666667) internal successors, (34), 5 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) Word has length 40 [2023-12-02 18:36:42,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:36:42,008 INFO L225 Difference]: With dead ends: 45 [2023-12-02 18:36:42,008 INFO L226 Difference]: Without dead ends: 45 [2023-12-02 18:36:42,009 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2023-12-02 18:36:42,009 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 42 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 18:36:42,010 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 57 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 18:36:42,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2023-12-02 18:36:42,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2023-12-02 18:36:42,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 43 states have (on average 1.0232558139534884) internal successors, (44), 44 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:42,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 44 transitions. [2023-12-02 18:36:42,011 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 44 transitions. Word has length 40 [2023-12-02 18:36:42,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:36:42,012 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 44 transitions. [2023-12-02 18:36:42,012 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.666666666666667) internal successors, (34), 5 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) [2023-12-02 18:36:42,012 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 44 transitions. [2023-12-02 18:36:42,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-12-02 18:36:42,012 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:36:42,013 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:36:42,019 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2023-12-02 18:36:42,218 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2023-12-02 18:36:42,219 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr31ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-12-02 18:36:42,219 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:36:42,219 INFO L85 PathProgramCache]: Analyzing trace with hash -784295189, now seen corresponding path program 1 times [2023-12-02 18:36:42,219 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:36:42,219 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1547658347] [2023-12-02 18:36:42,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:36:42,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:36:42,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:36:44,985 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:36:44,985 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:36:44,986 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1547658347] [2023-12-02 18:36:44,986 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1547658347] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:36:44,986 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [156869818] [2023-12-02 18:36:44,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:36:44,986 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:36:44,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:36:44,987 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:36:44,988 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41544978-c2e2-4617-936d-8c620c4d57d4/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2023-12-02 18:36:45,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:36:45,170 INFO L262 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 87 conjunts are in the unsatisfiable core [2023-12-02 18:36:45,174 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:36:45,213 INFO L349 Elim1Store]: treesize reduction 34, result has 30.6 percent of original size [2023-12-02 18:36:45,213 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 25 treesize of output 39 [2023-12-02 18:36:45,592 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 19 treesize of output 1 [2023-12-02 18:36:45,956 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 110 treesize of output 90 [2023-12-02 18:36:46,425 INFO L349 Elim1Store]: treesize reduction 27, result has 15.6 percent of original size [2023-12-02 18:36:46,425 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 116 treesize of output 83 [2023-12-02 18:36:46,429 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 70 treesize of output 50 [2023-12-02 18:36:47,033 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 45 treesize of output 29 [2023-12-02 18:36:47,579 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:36:47,579 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:36:48,707 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 73 treesize of output 61 [2023-12-02 18:36:48,937 INFO L349 Elim1Store]: treesize reduction 98, result has 30.0 percent of original size [2023-12-02 18:36:48,937 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 342 treesize of output 287 [2023-12-02 18:36:48,969 INFO L349 Elim1Store]: treesize reduction 27, result has 22.9 percent of original size [2023-12-02 18:36:48,970 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 419 treesize of output 359 [2023-12-02 18:36:48,987 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 218 treesize of output 210 [2023-12-02 18:37:43,642 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:37:43,642 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [156869818] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:37:43,642 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1967928713] [2023-12-02 18:37:43,644 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 18:37:43,644 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:37:43,644 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:37:43,644 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:37:43,644 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:37:46,601 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:38:06,664 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9902#(and (not (= |ULTIMATE.start_main_old_#valid#1| |#valid|)) (<= (+ |ULTIMATE.start_main_~i~0#1| 1) 0) (exists ((|v_#valid_260| (Array Int Int)) (|v_ULTIMATE.start_main_~#s~0#1.offset_21| Int) (|v_ULTIMATE.start_main_~#s~0#1.base_22| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#s~0#1.offset_21|) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_main_~#s~0#1.base_22|) |v_ULTIMATE.start_main_~#s~0#1.offset_21|) 0) (<= (+ 4 |v_ULTIMATE.start_main_~#s~0#1.offset_21|) (select |#length| |v_ULTIMATE.start_main_~#s~0#1.base_22|)) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_main_~#s~0#1.base_22|) |v_ULTIMATE.start_main_~#s~0#1.offset_21|) 0) (= (select |v_#valid_260| |v_ULTIMATE.start_main_~#s~0#1.base_22|) 1) (= (store |v_#valid_260| |v_ULTIMATE.start_main_~#s~0#1.base_22| 0) |#valid|))) (= |ULTIMATE.start_main_#res#1| 0))' at error location [2023-12-02 18:38:06,665 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:38:06,665 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:38:06,665 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 18, 19] total 58 [2023-12-02 18:38:06,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211523277] [2023-12-02 18:38:06,665 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:38:06,666 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2023-12-02 18:38:06,666 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:38:06,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2023-12-02 18:38:06,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=6704, Unknown=4, NotChecked=0, Total=6972 [2023-12-02 18:38:06,667 INFO L87 Difference]: Start difference. First operand 45 states and 44 transitions. Second operand has 60 states, 59 states have (on average 2.0338983050847457) internal successors, (120), 59 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:38:15,791 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2023-12-02 18:38:17,933 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2023-12-02 18:38:20,039 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2023-12-02 18:38:23,794 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2023-12-02 18:38:25,356 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.06s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2023-12-02 18:38:26,609 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.18s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2023-12-02 18:38:28,240 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.10s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2023-12-02 18:38:29,564 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.29s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1]