./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/dll2n_update_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version e7bb482b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/dll2n_update_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp --witnessprinter.witness.filename witness.graphml --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 cab0e4c46b209be0775136f8613c1e239028ef0244464c17ac04057ecb0a0b33 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 21:07:11,384 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 21:07:11,511 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-06 21:07:11,522 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 21:07:11,523 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 21:07:11,562 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 21:07:11,563 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 21:07:11,564 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 21:07:11,565 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 21:07:11,570 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 21:07:11,570 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 21:07:11,571 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 21:07:11,572 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 21:07:11,574 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 21:07:11,574 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 21:07:11,574 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 21:07:11,576 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 21:07:11,577 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 21:07:11,577 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 21:07:11,578 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 21:07:11,578 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 21:07:11,579 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 21:07:11,579 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-06 21:07:11,580 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-06 21:07:11,581 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 21:07:11,581 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 21:07:11,582 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 21:07:11,582 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 21:07:11,583 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 21:07:11,583 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-06 21:07:11,584 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-06 21:07:11,585 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-06 21:07:11,585 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 21:07:11,585 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-06 21:07:11,586 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-06 21:07:11,586 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 21:07:11,586 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 21:07:11,586 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 21:07:11,587 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 21:07:11,587 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 21:07:11,587 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 21:07:11,588 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 21:07:11,588 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 21:07:11,588 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 21:07:11,589 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 21:07:11,589 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 21:07:11,589 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_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cab0e4c46b209be0775136f8613c1e239028ef0244464c17ac04057ecb0a0b33 [2023-11-06 21:07:11,892 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 21:07:11,930 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 21:07:11,932 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 21:07:11,934 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 21:07:11,935 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 21:07:11,937 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/list-simple/dll2n_update_all_reverse.i [2023-11-06 21:07:15,188 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 21:07:15,528 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 21:07:15,530 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/sv-benchmarks/c/list-simple/dll2n_update_all_reverse.i [2023-11-06 21:07:15,558 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/data/af496745f/1eb99be623e3443c94efe265c002be34/FLAG0fddeca26 [2023-11-06 21:07:15,575 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/data/af496745f/1eb99be623e3443c94efe265c002be34 [2023-11-06 21:07:15,581 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 21:07:15,583 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 21:07:15,586 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 21:07:15,587 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 21:07:15,592 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 21:07:15,593 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:07:15" (1/1) ... [2023-11-06 21:07:15,594 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5cdb2370 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:07:15, skipping insertion in model container [2023-11-06 21:07:15,594 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:07:15" (1/1) ... [2023-11-06 21:07:15,664 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 21:07:16,016 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 21:07:16,027 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 21:07:16,082 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 21:07:16,112 INFO L206 MainTranslator]: Completed translation [2023-11-06 21:07:16,112 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:07:16 WrapperNode [2023-11-06 21:07:16,112 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 21:07:16,113 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 21:07:16,114 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 21:07:16,114 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 21:07:16,121 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:07:16" (1/1) ... [2023-11-06 21:07:16,135 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:07:16" (1/1) ... [2023-11-06 21:07:16,160 INFO L138 Inliner]: procedures = 126, calls = 28, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 120 [2023-11-06 21:07:16,161 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 21:07:16,162 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 21:07:16,162 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 21:07:16,162 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 21:07:16,171 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:07:16" (1/1) ... [2023-11-06 21:07:16,172 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:07:16" (1/1) ... [2023-11-06 21:07:16,177 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:07:16" (1/1) ... [2023-11-06 21:07:16,177 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:07:16" (1/1) ... [2023-11-06 21:07:16,185 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:07:16" (1/1) ... [2023-11-06 21:07:16,190 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:07:16" (1/1) ... [2023-11-06 21:07:16,192 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:07:16" (1/1) ... [2023-11-06 21:07:16,194 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:07:16" (1/1) ... [2023-11-06 21:07:16,197 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 21:07:16,198 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 21:07:16,199 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 21:07:16,199 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 21:07:16,200 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:07:16" (1/1) ... [2023-11-06 21:07:16,206 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 21:07:16,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:07:16,239 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 21:07:16,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 21:07:16,281 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-11-06 21:07:16,281 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-11-06 21:07:16,281 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-06 21:07:16,282 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-06 21:07:16,282 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-06 21:07:16,282 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 21:07:16,282 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-06 21:07:16,282 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-06 21:07:16,282 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-06 21:07:16,283 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 21:07:16,283 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 21:07:16,283 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 21:07:16,397 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 21:07:16,399 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 21:07:16,456 INFO L771 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-11-06 21:07:16,767 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 21:07:16,842 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 21:07:16,848 INFO L302 CfgBuilder]: Removed 6 assume(true) statements. [2023-11-06 21:07:16,850 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:07:16 BoogieIcfgContainer [2023-11-06 21:07:16,851 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 21:07:16,854 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 21:07:16,856 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 21:07:16,860 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 21:07:16,860 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 09:07:15" (1/3) ... [2023-11-06 21:07:16,861 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17325dca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:07:16, skipping insertion in model container [2023-11-06 21:07:16,862 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:07:16" (2/3) ... [2023-11-06 21:07:16,865 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17325dca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:07:16, skipping insertion in model container [2023-11-06 21:07:16,865 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:07:16" (3/3) ... [2023-11-06 21:07:16,867 INFO L112 eAbstractionObserver]: Analyzing ICFG dll2n_update_all_reverse.i [2023-11-06 21:07:16,884 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 21:07:16,884 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 23 error locations. [2023-11-06 21:07:16,930 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 21:07:16,937 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;@2786e577, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 21:07:16,937 INFO L358 AbstractCegarLoop]: Starting to check reachability of 23 error locations. [2023-11-06 21:07:16,942 INFO L276 IsEmpty]: Start isEmpty. Operand has 54 states, 29 states have (on average 2.1379310344827585) internal successors, (62), 52 states have internal predecessors, (62), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:07:16,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-06 21:07:16,948 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:07:16,949 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-06 21:07:16,950 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 20 more)] === [2023-11-06 21:07:16,955 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:07:16,955 INFO L85 PathProgramCache]: Analyzing trace with hash 6093447, now seen corresponding path program 1 times [2023-11-06 21:07:16,965 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:07:16,965 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [14819629] [2023-11-06 21:07:16,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:07:16,966 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:07:17,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:07:17,159 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:07:17,160 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:07:17,160 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [14819629] [2023-11-06 21:07:17,161 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [14819629] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:07:17,161 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:07:17,161 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 21:07:17,163 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054343876] [2023-11-06 21:07:17,164 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:07:17,168 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:07:17,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:07:17,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:07:17,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 21:07:17,214 INFO L87 Difference]: Start difference. First operand has 54 states, 29 states have (on average 2.1379310344827585) internal successors, (62), 52 states have internal predecessors, (62), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:07:17,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:07:17,300 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2023-11-06 21:07:17,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:07:17,303 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-06 21:07:17,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:07:17,310 INFO L225 Difference]: With dead ends: 50 [2023-11-06 21:07:17,311 INFO L226 Difference]: Without dead ends: 46 [2023-11-06 21:07:17,312 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 21:07:17,316 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 12 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 49 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 [2023-11-06 21:07:17,317 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 49 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:07:17,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-06 21:07:17,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2023-11-06 21:07:17,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 26 states have (on average 2.0) internal successors, (52), 45 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:07:17,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2023-11-06 21:07:17,350 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 4 [2023-11-06 21:07:17,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:07:17,350 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2023-11-06 21:07:17,351 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:07:17,351 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2023-11-06 21:07:17,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-06 21:07:17,351 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:07:17,351 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-06 21:07:17,352 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-06 21:07:17,352 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 20 more)] === [2023-11-06 21:07:17,353 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:07:17,353 INFO L85 PathProgramCache]: Analyzing trace with hash 6093448, now seen corresponding path program 1 times [2023-11-06 21:07:17,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:07:17,353 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [410811554] [2023-11-06 21:07:17,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:07:17,354 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:07:17,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:07:17,490 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:07:17,491 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:07:17,491 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [410811554] [2023-11-06 21:07:17,491 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [410811554] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:07:17,491 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:07:17,491 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 21:07:17,492 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159747049] [2023-11-06 21:07:17,492 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:07:17,493 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:07:17,493 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:07:17,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:07:17,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 21:07:17,494 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:07:17,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:07:17,557 INFO L93 Difference]: Finished difference Result 43 states and 49 transitions. [2023-11-06 21:07:17,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:07:17,557 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-06 21:07:17,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:07:17,558 INFO L225 Difference]: With dead ends: 43 [2023-11-06 21:07:17,559 INFO L226 Difference]: Without dead ends: 43 [2023-11-06 21:07:17,559 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 21:07:17,561 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 8 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:07:17,561 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 47 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:07:17,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2023-11-06 21:07:17,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2023-11-06 21:07:17,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 42 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:07:17,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2023-11-06 21:07:17,568 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 4 [2023-11-06 21:07:17,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:07:17,568 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2023-11-06 21:07:17,568 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:07:17,569 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2023-11-06 21:07:17,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-06 21:07:17,569 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:07:17,569 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-06 21:07:17,570 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-06 21:07:17,570 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 20 more)] === [2023-11-06 21:07:17,570 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:07:17,571 INFO L85 PathProgramCache]: Analyzing trace with hash 193846353, now seen corresponding path program 1 times [2023-11-06 21:07:17,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:07:17,571 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715724610] [2023-11-06 21:07:17,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:07:17,572 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:07:17,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:07:17,629 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:07:17,629 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:07:17,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715724610] [2023-11-06 21:07:17,630 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [715724610] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:07:17,630 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:07:17,630 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 21:07:17,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444270999] [2023-11-06 21:07:17,631 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:07:17,631 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:07:17,631 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:07:17,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:07:17,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 21:07:17,632 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:07:17,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:07:17,676 INFO L93 Difference]: Finished difference Result 53 states and 60 transitions. [2023-11-06 21:07:17,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:07:17,677 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-06 21:07:17,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:07:17,678 INFO L225 Difference]: With dead ends: 53 [2023-11-06 21:07:17,678 INFO L226 Difference]: Without dead ends: 53 [2023-11-06 21:07:17,679 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 21:07:17,680 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 10 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:07:17,681 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 66 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:07:17,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-11-06 21:07:17,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 44. [2023-11-06 21:07:17,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 27 states have (on average 1.8518518518518519) internal successors, (50), 43 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:07:17,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 50 transitions. [2023-11-06 21:07:17,688 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 50 transitions. Word has length 5 [2023-11-06 21:07:17,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:07:17,689 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 50 transitions. [2023-11-06 21:07:17,689 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:07:17,689 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 50 transitions. [2023-11-06 21:07:17,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-06 21:07:17,691 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:07:17,691 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:07:17,691 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-06 21:07:17,692 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 20 more)] === [2023-11-06 21:07:17,693 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:07:17,694 INFO L85 PathProgramCache]: Analyzing trace with hash 1019019915, now seen corresponding path program 1 times [2023-11-06 21:07:17,694 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:07:17,694 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107864542] [2023-11-06 21:07:17,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:07:17,695 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:07:17,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:07:17,847 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:07:17,847 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:07:17,847 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107864542] [2023-11-06 21:07:17,847 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [107864542] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:07:17,848 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:07:17,848 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 21:07:17,848 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812531318] [2023-11-06 21:07:17,848 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:07:17,849 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:07:17,849 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:07:17,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:07:17,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 21:07:17,850 INFO L87 Difference]: Start difference. First operand 44 states and 50 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:07:17,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:07:17,930 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2023-11-06 21:07:17,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:07:17,933 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-06 21:07:17,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:07:17,934 INFO L225 Difference]: With dead ends: 50 [2023-11-06 21:07:17,934 INFO L226 Difference]: Without dead ends: 50 [2023-11-06 21:07:17,934 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 21:07:17,936 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 1 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:07:17,937 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 61 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:07:17,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-11-06 21:07:17,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2023-11-06 21:07:17,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 32 states have (on average 1.71875) internal successors, (55), 48 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:07:17,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 55 transitions. [2023-11-06 21:07:17,943 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 55 transitions. Word has length 8 [2023-11-06 21:07:17,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:07:17,944 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 55 transitions. [2023-11-06 21:07:17,944 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:07:17,944 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 55 transitions. [2023-11-06 21:07:17,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-06 21:07:17,945 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:07:17,945 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:07:17,946 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-06 21:07:17,946 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 20 more)] === [2023-11-06 21:07:17,947 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:07:17,947 INFO L85 PathProgramCache]: Analyzing trace with hash -1019963600, now seen corresponding path program 1 times [2023-11-06 21:07:17,947 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:07:17,947 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1215805073] [2023-11-06 21:07:17,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:07:17,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:07:17,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:07:18,113 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:07:18,114 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:07:18,114 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1215805073] [2023-11-06 21:07:18,114 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1215805073] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:07:18,115 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1522966348] [2023-11-06 21:07:18,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:07:18,115 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:07:18,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:07:18,122 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:07:18,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 21:07:18,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:07:18,247 INFO L262 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-06 21:07:18,252 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:07:18,313 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:07:18,313 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:07:18,363 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:07:18,364 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1522966348] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:07:18,364 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [490028478] [2023-11-06 21:07:18,391 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-06 21:07:18,391 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:07:18,395 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:07:18,401 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:07:18,401 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:07:20,252 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:07:28,144 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [490028478] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:07:28,144 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:07:28,145 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 10 [2023-11-06 21:07:28,145 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292536279] [2023-11-06 21:07:28,146 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:07:28,146 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-06 21:07:28,146 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:07:28,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-06 21:07:28,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=67, Unknown=8, NotChecked=0, Total=110 [2023-11-06 21:07:28,148 INFO L87 Difference]: Start difference. First operand 49 states and 55 transitions. Second operand has 8 states, 8 states have (on average 1.5) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:07:30,919 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] [2023-11-06 21:07:32,852 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.53s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-06 21:07:35,110 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-06 21:07:40,353 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.29s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-06 21:07:42,893 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-06 21:07:44,990 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.51s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-06 21:07:47,446 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.26s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-06 21:07:48,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:07:48,591 INFO L93 Difference]: Finished difference Result 60 states and 67 transitions. [2023-11-06 21:07:48,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-06 21:07:48,591 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.5) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-06 21:07:48,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:07:48,592 INFO L225 Difference]: With dead ends: 60 [2023-11-06 21:07:48,592 INFO L226 Difference]: Without dead ends: 60 [2023-11-06 21:07:48,593 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=44, Invalid=78, Unknown=10, NotChecked=0, Total=132 [2023-11-06 21:07:48,594 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 5 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 262 mSolverCounterSat, 2 mSolverCounterUnsat, 12 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 262 IncrementalHoareTripleChecker+Invalid, 12 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.5s IncrementalHoareTripleChecker+Time [2023-11-06 21:07:48,595 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 80 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 262 Invalid, 12 Unknown, 0 Unchecked, 17.5s Time] [2023-11-06 21:07:48,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-11-06 21:07:48,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2023-11-06 21:07:48,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 39 states have (on average 1.6153846153846154) internal successors, (63), 55 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) [2023-11-06 21:07:48,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 63 transitions. [2023-11-06 21:07:48,601 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 63 transitions. Word has length 12 [2023-11-06 21:07:48,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:07:48,601 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 63 transitions. [2023-11-06 21:07:48,601 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.5) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:07:48,602 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 63 transitions. [2023-11-06 21:07:48,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-06 21:07:48,602 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:07:48,602 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2023-11-06 21:07:48,614 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-06 21:07:48,803 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:07:48,803 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 20 more)] === [2023-11-06 21:07:48,804 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:07:48,804 INFO L85 PathProgramCache]: Analyzing trace with hash -263624884, now seen corresponding path program 1 times [2023-11-06 21:07:48,804 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:07:48,805 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [177018139] [2023-11-06 21:07:48,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:07:48,805 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:07:48,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:07:49,067 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:07:49,067 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:07:49,067 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [177018139] [2023-11-06 21:07:49,067 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [177018139] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:07:49,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [705798210] [2023-11-06 21:07:49,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:07:49,068 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:07:49,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:07:49,070 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:07:49,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04a5d47c-047b-4bd5-b083-a6ef7b851994/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 21:07:49,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:07:49,182 INFO L262 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-06 21:07:49,184 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:07:49,214 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-06 21:07:49,301 INFO L322 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-11-06 21:07:49,302 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-11-06 21:07:49,330 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:07:49,330 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:07:49,543 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:07:49,543 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [705798210] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:07:49,543 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [19731206] [2023-11-06 21:07:49,546 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-06 21:07:49,546 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:07:49,546 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:07:49,547 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:07:49,547 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs