./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version cf1a7837 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_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX --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 fabf091179f48b7141dc193b5040f4974c042bd8a2afb03b99137d693bf63ce7 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:55:05,072 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:55:05,223 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-12 00:55:05,230 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:55:05,231 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:55:05,264 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:55:05,265 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:55:05,266 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:55:05,267 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:55:05,268 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:55:05,269 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:55:05,269 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:55:05,270 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:55:05,271 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:55:05,271 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:55:05,272 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:55:05,273 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:55:05,273 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:55:05,274 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:55:05,275 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:55:05,275 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:55:05,276 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:55:05,277 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-12 00:55:05,278 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-12 00:55:05,278 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:55:05,279 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:55:05,279 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:55:05,280 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:55:05,281 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:55:05,281 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-12 00:55:05,282 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-12 00:55:05,282 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-12 00:55:05,282 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:55:05,283 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-12 00:55:05,283 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-12 00:55:05,283 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:55:05,284 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:55:05,284 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:55:05,284 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:55:05,285 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:55:05,285 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:55:05,286 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:55:05,286 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:55:05,286 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:55:05,287 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:55:05,287 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:55:05,287 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_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fabf091179f48b7141dc193b5040f4974c042bd8a2afb03b99137d693bf63ce7 [2023-11-12 00:55:05,610 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:55:05,649 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:55:05,652 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:55:05,654 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:55:05,655 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:55:05,657 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i [2023-11-12 00:55:09,112 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:55:09,484 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:55:09,489 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i [2023-11-12 00:55:09,516 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/data/b36f2deb2/389782b1a3dd4f5f862b35d50ec5e9d0/FLAGf9fbae1be [2023-11-12 00:55:09,533 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/data/b36f2deb2/389782b1a3dd4f5f862b35d50ec5e9d0 [2023-11-12 00:55:09,539 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:55:09,542 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:55:09,544 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:55:09,544 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:55:09,550 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:55:09,552 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:55:09" (1/1) ... [2023-11-12 00:55:09,554 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d33798d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:09, skipping insertion in model container [2023-11-12 00:55:09,554 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:55:09" (1/1) ... [2023-11-12 00:55:09,616 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:55:09,962 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:55:09,975 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:55:10,060 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:55:10,107 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:55:10,107 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:10 WrapperNode [2023-11-12 00:55:10,107 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:55:10,108 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:55:10,109 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:55:10,109 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:55:10,117 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:10" (1/1) ... [2023-11-12 00:55:10,134 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:10" (1/1) ... [2023-11-12 00:55:10,171 INFO L138 Inliner]: procedures = 129, calls = 40, calls flagged for inlining = 8, calls inlined = 8, statements flattened = 192 [2023-11-12 00:55:10,172 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:55:10,173 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:55:10,173 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:55:10,174 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:55:10,189 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:10" (1/1) ... [2023-11-12 00:55:10,190 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:10" (1/1) ... [2023-11-12 00:55:10,217 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:10" (1/1) ... [2023-11-12 00:55:10,217 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:10" (1/1) ... [2023-11-12 00:55:10,231 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:10" (1/1) ... [2023-11-12 00:55:10,258 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:10" (1/1) ... [2023-11-12 00:55:10,261 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:10" (1/1) ... [2023-11-12 00:55:10,263 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:10" (1/1) ... [2023-11-12 00:55:10,267 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:55:10,268 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:55:10,269 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:55:10,269 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:55:10,270 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:10" (1/1) ... [2023-11-12 00:55:10,277 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:55:10,294 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:55:10,309 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:55:10,321 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:55:10,362 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-11-12 00:55:10,363 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-11-12 00:55:10,363 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-12 00:55:10,363 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:55:10,363 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-12 00:55:10,364 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-12 00:55:10,364 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-12 00:55:10,364 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 00:55:10,366 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-12 00:55:10,366 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:55:10,367 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:55:10,367 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:55:10,515 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:55:10,517 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:55:10,558 INFO L770 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-11-12 00:55:11,019 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:55:11,096 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:55:11,096 INFO L302 CfgBuilder]: Removed 9 assume(true) statements. [2023-11-12 00:55:11,099 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:55:11 BoogieIcfgContainer [2023-11-12 00:55:11,100 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:55:11,103 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:55:11,103 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:55:11,107 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:55:11,107 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:55:09" (1/3) ... [2023-11-12 00:55:11,108 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5428b227 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:55:11, skipping insertion in model container [2023-11-12 00:55:11,109 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:10" (2/3) ... [2023-11-12 00:55:11,109 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5428b227 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:55:11, skipping insertion in model container [2023-11-12 00:55:11,110 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:55:11" (3/3) ... [2023-11-12 00:55:11,111 INFO L112 eAbstractionObserver]: Analyzing ICFG sll_of_sll_nondet_append-1.i [2023-11-12 00:55:11,133 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:55:11,133 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 42 error locations. [2023-11-12 00:55:11,185 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:55:11,193 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;@23f285c4, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:55:11,194 INFO L358 AbstractCegarLoop]: Starting to check reachability of 42 error locations. [2023-11-12 00:55:11,199 INFO L276 IsEmpty]: Start isEmpty. Operand has 97 states, 52 states have (on average 2.173076923076923) internal successors, (113), 95 states have internal predecessors, (113), 2 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:11,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-12 00:55:11,206 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:11,206 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-12 00:55:11,207 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr18REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-12 00:55:11,213 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:11,214 INFO L85 PathProgramCache]: Analyzing trace with hash 306466, now seen corresponding path program 1 times [2023-11-12 00:55:11,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:11,226 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [136872223] [2023-11-12 00:55:11,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:11,227 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:11,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:11,486 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:55:11,487 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:11,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [136872223] [2023-11-12 00:55:11,488 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [136872223] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:55:11,489 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:55:11,489 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:55:11,491 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234380400] [2023-11-12 00:55:11,491 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:55:11,496 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:55:11,498 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:11,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:55:11,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:55:11,545 INFO L87 Difference]: Start difference. First operand has 97 states, 52 states have (on average 2.173076923076923) internal successors, (113), 95 states have internal predecessors, (113), 2 states have call successors, (2), 1 states have call predecessors, (2), 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 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:11,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:11,693 INFO L93 Difference]: Finished difference Result 136 states and 156 transitions. [2023-11-12 00:55:11,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:55:11,696 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-11-12 00:55:11,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:11,706 INFO L225 Difference]: With dead ends: 136 [2023-11-12 00:55:11,706 INFO L226 Difference]: Without dead ends: 129 [2023-11-12 00:55:11,708 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 [2023-11-12 00:55:11,712 INFO L413 NwaCegarLoop]: 83 mSDtfsCounter, 43 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:11,713 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 157 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:55:11,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2023-11-12 00:55:11,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 92. [2023-11-12 00:55:11,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 50 states have (on average 2.08) internal successors, (104), 91 states have internal predecessors, (104), 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) [2023-11-12 00:55:11,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 104 transitions. [2023-11-12 00:55:11,759 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 104 transitions. Word has length 3 [2023-11-12 00:55:11,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:11,759 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 104 transitions. [2023-11-12 00:55:11,759 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:11,760 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 104 transitions. [2023-11-12 00:55:11,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-12 00:55:11,760 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:11,760 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:11,761 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:55:11,761 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr18REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-12 00:55:11,762 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:11,762 INFO L85 PathProgramCache]: Analyzing trace with hash 68182074, now seen corresponding path program 1 times [2023-11-12 00:55:11,762 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:11,763 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [100344912] [2023-11-12 00:55:11,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:11,763 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:11,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:11,857 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:55:11,857 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:11,857 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [100344912] [2023-11-12 00:55:11,858 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [100344912] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:55:11,858 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:55:11,858 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 00:55:11,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469301181] [2023-11-12 00:55:11,858 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:55:11,860 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:55:11,860 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:11,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:55:11,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:55:11,861 INFO L87 Difference]: Start difference. First operand 92 states and 104 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:11,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:11,991 INFO L93 Difference]: Finished difference Result 113 states and 127 transitions. [2023-11-12 00:55:11,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:55:11,992 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-12 00:55:11,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:11,994 INFO L225 Difference]: With dead ends: 113 [2023-11-12 00:55:11,994 INFO L226 Difference]: Without dead ends: 113 [2023-11-12 00:55:11,995 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:55:11,997 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 89 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:11,997 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 64 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:55:11,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2023-11-12 00:55:12,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 90. [2023-11-12 00:55:12,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 50 states have (on average 2.04) internal successors, (102), 89 states have internal predecessors, (102), 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) [2023-11-12 00:55:12,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 102 transitions. [2023-11-12 00:55:12,008 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 102 transitions. Word has length 7 [2023-11-12 00:55:12,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:12,009 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 102 transitions. [2023-11-12 00:55:12,009 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:12,010 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 102 transitions. [2023-11-12 00:55:12,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-12 00:55:12,010 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:12,011 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:12,011 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-12 00:55:12,011 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr19REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-12 00:55:12,012 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:12,012 INFO L85 PathProgramCache]: Analyzing trace with hash 68182075, now seen corresponding path program 1 times [2023-11-12 00:55:12,013 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:12,013 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370548498] [2023-11-12 00:55:12,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:12,014 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:12,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:12,121 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:55:12,121 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:12,122 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370548498] [2023-11-12 00:55:12,122 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [370548498] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:55:12,122 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [217959309] [2023-11-12 00:55:12,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:12,123 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:12,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:55:12,127 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:55:12,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:55:12,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:12,248 INFO L262 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-12 00:55:12,255 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:55:12,418 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:55:12,421 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:55:12,458 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:55:12,459 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [217959309] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:55:12,460 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1748799832] [2023-11-12 00:55:12,491 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:55:12,492 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:55:12,499 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:55:12,506 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:55:12,507 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:55:13,417 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:55:13,575 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '580#(and (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#head~1#1.base|) 3) (= 5 |ULTIMATE.start_main_~max~0#1|) (= |ULTIMATE.start_main_~#head~1#1.offset| 0) (= 3 |ULTIMATE.start_main_~min~0#1|) (<= 2 |ULTIMATE.start_main_~#head~1#1.base|) (<= 6 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-12 00:55:13,576 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:55:13,576 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:55:13,576 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-12 00:55:13,576 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479718973] [2023-11-12 00:55:13,577 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:55:13,577 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:55:13,577 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:13,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:55:13,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2023-11-12 00:55:13,580 INFO L87 Difference]: Start difference. First operand 90 states and 102 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:13,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:13,779 INFO L93 Difference]: Finished difference Result 201 states and 222 transitions. [2023-11-12 00:55:13,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:55:13,780 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-12 00:55:13,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:13,782 INFO L225 Difference]: With dead ends: 201 [2023-11-12 00:55:13,782 INFO L226 Difference]: Without dead ends: 201 [2023-11-12 00:55:13,783 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2023-11-12 00:55:13,784 INFO L413 NwaCegarLoop]: 94 mSDtfsCounter, 284 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:13,785 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [284 Valid, 244 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:55:13,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2023-11-12 00:55:13,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 133. [2023-11-12 00:55:13,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 93 states have (on average 2.043010752688172) internal successors, (190), 132 states have internal predecessors, (190), 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) [2023-11-12 00:55:13,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 190 transitions. [2023-11-12 00:55:13,799 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 190 transitions. Word has length 7 [2023-11-12 00:55:13,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:13,799 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 190 transitions. [2023-11-12 00:55:13,799 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:13,799 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 190 transitions. [2023-11-12 00:55:13,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-12 00:55:13,800 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:13,800 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:13,810 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-12 00:55:14,009 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-11-12 00:55:14,010 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-12 00:55:14,011 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:14,011 INFO L85 PathProgramCache]: Analyzing trace with hash 2112769602, now seen corresponding path program 1 times [2023-11-12 00:55:14,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:14,011 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767807313] [2023-11-12 00:55:14,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:14,012 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:14,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:14,238 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:55:14,238 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:14,238 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767807313] [2023-11-12 00:55:14,241 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [767807313] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:55:14,242 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:55:14,242 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 00:55:14,242 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364739315] [2023-11-12 00:55:14,242 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:55:14,243 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:55:14,243 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:14,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:55:14,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:55:14,247 INFO L87 Difference]: Start difference. First operand 133 states and 190 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 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) [2023-11-12 00:55:14,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:14,392 INFO L93 Difference]: Finished difference Result 156 states and 195 transitions. [2023-11-12 00:55:14,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:55:14,393 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 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 [2023-11-12 00:55:14,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:14,395 INFO L225 Difference]: With dead ends: 156 [2023-11-12 00:55:14,395 INFO L226 Difference]: Without dead ends: 156 [2023-11-12 00:55:14,396 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:55:14,403 INFO L413 NwaCegarLoop]: 73 mSDtfsCounter, 65 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 286 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:14,405 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 286 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 117 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:55:14,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2023-11-12 00:55:14,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 134. [2023-11-12 00:55:14,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 94 states have (on average 2.0319148936170213) internal successors, (191), 133 states have internal predecessors, (191), 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) [2023-11-12 00:55:14,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 191 transitions. [2023-11-12 00:55:14,434 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 191 transitions. Word has length 8 [2023-11-12 00:55:14,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:14,434 INFO L495 AbstractCegarLoop]: Abstraction has 134 states and 191 transitions. [2023-11-12 00:55:14,435 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 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) [2023-11-12 00:55:14,435 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 191 transitions. [2023-11-12 00:55:14,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-12 00:55:14,435 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:14,436 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:14,436 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-12 00:55:14,436 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-12 00:55:14,437 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:14,437 INFO L85 PathProgramCache]: Analyzing trace with hash 1071102820, now seen corresponding path program 1 times [2023-11-12 00:55:14,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:14,438 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1887262931] [2023-11-12 00:55:14,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:14,438 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:14,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:14,550 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:55:14,550 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:14,551 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1887262931] [2023-11-12 00:55:14,551 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1887262931] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:55:14,551 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:55:14,551 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:55:14,552 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442097076] [2023-11-12 00:55:14,552 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:55:14,552 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:55:14,553 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:14,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:55:14,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:55:14,554 INFO L87 Difference]: Start difference. First operand 134 states and 191 transitions. Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 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) [2023-11-12 00:55:14,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:14,654 INFO L93 Difference]: Finished difference Result 133 states and 188 transitions. [2023-11-12 00:55:14,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:55:14,655 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 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 [2023-11-12 00:55:14,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:14,657 INFO L225 Difference]: With dead ends: 133 [2023-11-12 00:55:14,657 INFO L226 Difference]: Without dead ends: 133 [2023-11-12 00:55:14,657 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 [2023-11-12 00:55:14,658 INFO L413 NwaCegarLoop]: 75 mSDtfsCounter, 1 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:14,659 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 124 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:55:14,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2023-11-12 00:55:14,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2023-11-12 00:55:14,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 94 states have (on average 2.0) internal successors, (188), 132 states have internal predecessors, (188), 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) [2023-11-12 00:55:14,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 188 transitions. [2023-11-12 00:55:14,681 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 188 transitions. Word has length 9 [2023-11-12 00:55:14,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:14,682 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 188 transitions. [2023-11-12 00:55:14,686 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 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) [2023-11-12 00:55:14,687 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 188 transitions. [2023-11-12 00:55:14,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-12 00:55:14,687 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:14,687 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:14,688 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-12 00:55:14,688 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-12 00:55:14,689 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:14,689 INFO L85 PathProgramCache]: Analyzing trace with hash 1071102821, now seen corresponding path program 1 times [2023-11-12 00:55:14,691 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:14,692 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250593678] [2023-11-12 00:55:14,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:14,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:14,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:14,811 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:55:14,811 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:14,812 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250593678] [2023-11-12 00:55:14,812 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1250593678] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:55:14,812 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:55:14,812 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:55:14,813 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78062652] [2023-11-12 00:55:14,813 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:55:14,814 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:55:14,814 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:14,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:55:14,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:55:14,815 INFO L87 Difference]: Start difference. First operand 133 states and 188 transitions. Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 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) [2023-11-12 00:55:14,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:14,906 INFO L93 Difference]: Finished difference Result 132 states and 185 transitions. [2023-11-12 00:55:14,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:55:14,907 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 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 [2023-11-12 00:55:14,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:14,908 INFO L225 Difference]: With dead ends: 132 [2023-11-12 00:55:14,908 INFO L226 Difference]: Without dead ends: 132 [2023-11-12 00:55:14,908 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 [2023-11-12 00:55:14,910 INFO L413 NwaCegarLoop]: 75 mSDtfsCounter, 0 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:14,911 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 127 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:55:14,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2023-11-12 00:55:14,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2023-11-12 00:55:14,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 94 states have (on average 1.9680851063829787) internal successors, (185), 131 states have internal predecessors, (185), 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) [2023-11-12 00:55:14,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 185 transitions. [2023-11-12 00:55:14,923 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 185 transitions. Word has length 9 [2023-11-12 00:55:14,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:14,923 INFO L495 AbstractCegarLoop]: Abstraction has 132 states and 185 transitions. [2023-11-12 00:55:14,923 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 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) [2023-11-12 00:55:14,923 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 185 transitions. [2023-11-12 00:55:14,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-12 00:55:14,924 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:14,924 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:14,925 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-12 00:55:14,925 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-12 00:55:14,926 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:14,927 INFO L85 PathProgramCache]: Analyzing trace with hash -1462112484, now seen corresponding path program 1 times [2023-11-12 00:55:14,927 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:14,927 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554075400] [2023-11-12 00:55:14,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:14,927 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:14,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:15,085 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:55:15,085 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:15,086 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554075400] [2023-11-12 00:55:15,086 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [554075400] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:55:15,086 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [191640066] [2023-11-12 00:55:15,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:15,087 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:15,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:55:15,088 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:55:15,103 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:55:15,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:15,217 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-12 00:55:15,219 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:55:15,265 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:55:15,265 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:55:15,324 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:55:15,324 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [191640066] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:55:15,325 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1837823534] [2023-11-12 00:55:15,327 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-12 00:55:15,328 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:55:15,328 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:55:15,328 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:55:15,328 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:55:16,787 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:55:17,917 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1824#(and (= 3 |ULTIMATE.start_node_create_with_sublist_#in~sublist_length#1|) (<= 1 |#StackHeapBarrier|) (= 3 |ULTIMATE.start_sll_append_#in~sublist_length#1|) (not (= (select |#valid| |ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base|) 1)) (= |ULTIMATE.start_sll_append_~sublist_length#1| 3) (= 3 |ULTIMATE.start_main_~i~0#1|) (= 5 |ULTIMATE.start_main_~max~0#1|) (<= 2 |ULTIMATE.start_sll_append_#in~head#1.base|) (= |ULTIMATE.start_node_create_with_sublist_#t~ret6#1.base| |ULTIMATE.start_sll_create_#res#1.base|) (= |ULTIMATE.start_main_~#head~1#1.offset| 0) (= |ULTIMATE.start_sll_append_~head#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_node_create_with_sublist_~sublist_length#1| 3) (= |ULTIMATE.start_node_create_with_sublist_~new_node~0#1.offset| 0) (= 3 |ULTIMATE.start_main_~min~0#1|) (<= 2 |ULTIMATE.start_sll_append_~head#1.base|) (<= 2 |ULTIMATE.start_main_~#head~1#1.base|) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_sll_append_#in~head#1.offset| 0) (= 0 |ULTIMATE.start_node_create_with_sublist_#t~ret6#1.offset|))' at error location [2023-11-12 00:55:17,917 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:55:17,918 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:55:17,918 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-11-12 00:55:17,918 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34301155] [2023-11-12 00:55:17,918 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:55:17,918 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-12 00:55:17,919 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:17,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-12 00:55:17,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2023-11-12 00:55:17,919 INFO L87 Difference]: Start difference. First operand 132 states and 185 transitions. Second operand has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 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) [2023-11-12 00:55:18,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:18,284 INFO L93 Difference]: Finished difference Result 219 states and 264 transitions. [2023-11-12 00:55:18,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-12 00:55:18,285 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-12 00:55:18,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:18,286 INFO L225 Difference]: With dead ends: 219 [2023-11-12 00:55:18,286 INFO L226 Difference]: Without dead ends: 219 [2023-11-12 00:55:18,287 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=178, Invalid=472, Unknown=0, NotChecked=0, Total=650 [2023-11-12 00:55:18,288 INFO L413 NwaCegarLoop]: 105 mSDtfsCounter, 259 mSDsluCounter, 439 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 544 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:18,288 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [259 Valid, 544 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:55:18,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2023-11-12 00:55:18,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 152. [2023-11-12 00:55:18,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 114 states have (on average 1.7982456140350878) internal successors, (205), 151 states have internal predecessors, (205), 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) [2023-11-12 00:55:18,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 205 transitions. [2023-11-12 00:55:18,293 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 205 transitions. Word has length 11 [2023-11-12 00:55:18,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:18,293 INFO L495 AbstractCegarLoop]: Abstraction has 152 states and 205 transitions. [2023-11-12 00:55:18,293 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 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) [2023-11-12 00:55:18,294 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 205 transitions. [2023-11-12 00:55:18,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-12 00:55:18,298 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:18,299 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1] [2023-11-12 00:55:18,309 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 00:55:18,505 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-12 00:55:18,505 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr19REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-12 00:55:18,505 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:18,506 INFO L85 PathProgramCache]: Analyzing trace with hash 1869603435, now seen corresponding path program 2 times [2023-11-12 00:55:18,506 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:18,506 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [45045994] [2023-11-12 00:55:18,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:18,506 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:18,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:18,589 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-12 00:55:18,590 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:18,590 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [45045994] [2023-11-12 00:55:18,590 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [45045994] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:55:18,590 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:55:18,591 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 00:55:18,591 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500702882] [2023-11-12 00:55:18,591 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:55:18,592 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:55:18,592 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:18,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:55:18,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:55:18,593 INFO L87 Difference]: Start difference. First operand 152 states and 205 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:18,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:18,666 INFO L93 Difference]: Finished difference Result 150 states and 203 transitions. [2023-11-12 00:55:18,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:55:18,667 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-12 00:55:18,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:18,668 INFO L225 Difference]: With dead ends: 150 [2023-11-12 00:55:18,669 INFO L226 Difference]: Without dead ends: 150 [2023-11-12 00:55:18,669 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:55:18,670 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 87 mSDsluCounter, 1 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:18,671 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 55 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:55:18,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2023-11-12 00:55:18,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 150. [2023-11-12 00:55:18,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 114 states have (on average 1.780701754385965) internal successors, (203), 149 states have internal predecessors, (203), 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) [2023-11-12 00:55:18,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 203 transitions. [2023-11-12 00:55:18,679 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 203 transitions. Word has length 15 [2023-11-12 00:55:18,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:18,680 INFO L495 AbstractCegarLoop]: Abstraction has 150 states and 203 transitions. [2023-11-12 00:55:18,680 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:18,680 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 203 transitions. [2023-11-12 00:55:18,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-12 00:55:18,681 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:18,681 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:18,682 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-12 00:55:18,682 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-12 00:55:18,684 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:18,684 INFO L85 PathProgramCache]: Analyzing trace with hash 1525644636, now seen corresponding path program 2 times [2023-11-12 00:55:18,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:18,684 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1467411829] [2023-11-12 00:55:18,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:18,685 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:18,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:18,904 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-12 00:55:18,904 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:18,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1467411829] [2023-11-12 00:55:18,904 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1467411829] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:55:18,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [881116015] [2023-11-12 00:55:18,905 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:55:18,905 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:18,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:55:18,906 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:55:18,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:55:19,032 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-12 00:55:19,032 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:55:19,034 INFO L262 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-12 00:55:19,036 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:55:19,068 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 [2023-11-12 00:55:19,121 INFO L322 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-11-12 00:55:19,121 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 17 treesize of output 21 [2023-11-12 00:55:19,206 INFO L322 Elim1Store]: treesize reduction 40, result has 32.2 percent of original size [2023-11-12 00:55:19,207 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 24 treesize of output 28 [2023-11-12 00:55:19,279 INFO L322 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2023-11-12 00:55:19,280 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 25 [2023-11-12 00:55:19,391 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-12 00:55:19,391 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:55:19,532 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:55:19,532 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [881116015] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:55:19,533 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1199916905] [2023-11-12 00:55:19,536 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-12 00:55:19,536 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:55:19,536 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:55:19,536 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:55:19,537 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:55:20,840 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:55:21,983 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2628#(and (= 3 |ULTIMATE.start_node_create_with_sublist_#in~sublist_length#1|) (<= 1 |#StackHeapBarrier|) (= 3 |ULTIMATE.start_sll_append_#in~sublist_length#1|) (not (= (select |#valid| |ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base|) 1)) (= |ULTIMATE.start_sll_append_~sublist_length#1| 3) (= 3 |ULTIMATE.start_main_~i~0#1|) (= 5 |ULTIMATE.start_main_~max~0#1|) (<= 2 |ULTIMATE.start_sll_append_#in~head#1.base|) (= |ULTIMATE.start_node_create_with_sublist_#t~ret6#1.base| |ULTIMATE.start_sll_create_#res#1.base|) (= |ULTIMATE.start_main_~#head~1#1.offset| 0) (= |ULTIMATE.start_sll_append_~head#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_node_create_with_sublist_~sublist_length#1| 3) (= |ULTIMATE.start_node_create_with_sublist_~new_node~0#1.offset| 0) (= 3 |ULTIMATE.start_main_~min~0#1|) (<= 2 |ULTIMATE.start_sll_append_~head#1.base|) (<= 2 |ULTIMATE.start_main_~#head~1#1.base|) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_sll_append_#in~head#1.offset| 0) (= 0 |ULTIMATE.start_node_create_with_sublist_#t~ret6#1.offset|))' at error location [2023-11-12 00:55:21,983 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:55:21,983 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:55:21,983 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 5] total 9 [2023-11-12 00:55:21,984 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119600005] [2023-11-12 00:55:21,984 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:55:21,984 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-12 00:55:21,984 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:21,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-12 00:55:21,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2023-11-12 00:55:21,985 INFO L87 Difference]: Start difference. First operand 150 states and 203 transitions. Second operand has 10 states, 9 states have (on average 4.0) internal successors, (36), 10 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:22,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:22,282 INFO L93 Difference]: Finished difference Result 148 states and 197 transitions. [2023-11-12 00:55:22,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:55:22,283 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.0) internal successors, (36), 10 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-11-12 00:55:22,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:22,284 INFO L225 Difference]: With dead ends: 148 [2023-11-12 00:55:22,285 INFO L226 Difference]: Without dead ends: 148 [2023-11-12 00:55:22,285 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 37 SyntacticMatches, 4 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2023-11-12 00:55:22,286 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 3 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:22,286 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 244 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 203 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:55:22,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2023-11-12 00:55:22,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2023-11-12 00:55:22,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 114 states have (on average 1.7280701754385965) internal successors, (197), 147 states have internal predecessors, (197), 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) [2023-11-12 00:55:22,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 197 transitions. [2023-11-12 00:55:22,291 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 197 transitions. Word has length 17 [2023-11-12 00:55:22,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:22,291 INFO L495 AbstractCegarLoop]: Abstraction has 148 states and 197 transitions. [2023-11-12 00:55:22,291 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.0) internal successors, (36), 10 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:22,292 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 197 transitions. [2023-11-12 00:55:22,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-12 00:55:22,293 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:22,293 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:22,300 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:55:22,500 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-12 00:55:22,500 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-12 00:55:22,501 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:22,501 INFO L85 PathProgramCache]: Analyzing trace with hash 1525644637, now seen corresponding path program 1 times [2023-11-12 00:55:22,501 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:22,501 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426213021] [2023-11-12 00:55:22,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:22,501 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:22,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:22,947 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-12 00:55:22,947 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:22,948 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426213021] [2023-11-12 00:55:22,948 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [426213021] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:55:22,948 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1829422260] [2023-11-12 00:55:22,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:22,948 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:22,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:55:22,950 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:55:22,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 00:55:23,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:23,071 INFO L262 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-12 00:55:23,074 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:55:23,081 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 8 treesize of output 1 [2023-11-12 00:55:23,084 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 [2023-11-12 00:55:23,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:55:23,115 INFO L351 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 [2023-11-12 00:55:23,133 INFO L322 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-11-12 00:55:23,134 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 17 treesize of output 21 [2023-11-12 00:55:23,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:55:23,205 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 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 [2023-11-12 00:55:23,220 INFO L322 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2023-11-12 00:55:23,221 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 16 treesize of output 18 [2023-11-12 00:55:23,252 INFO L322 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-12 00:55:23,253 INFO L351 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 [2023-11-12 00:55:23,286 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-12 00:55:23,286 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:55:23,749 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:55:23,749 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1829422260] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:55:23,749 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [253407642] [2023-11-12 00:55:23,752 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-12 00:55:23,752 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:55:23,752 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:55:23,753 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:55:23,753 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:55:24,771 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:55:25,648 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3041#(and (= 3 |ULTIMATE.start_node_create_with_sublist_#in~sublist_length#1|) (<= 1 |#StackHeapBarrier|) (= 3 |ULTIMATE.start_sll_append_#in~sublist_length#1|) (= |ULTIMATE.start_sll_append_~sublist_length#1| 3) (= 3 |ULTIMATE.start_main_~i~0#1|) (= 5 |ULTIMATE.start_main_~max~0#1|) (<= 2 |ULTIMATE.start_sll_append_#in~head#1.base|) (= |ULTIMATE.start_node_create_with_sublist_#t~ret6#1.base| |ULTIMATE.start_sll_create_#res#1.base|) (= |ULTIMATE.start_main_~#head~1#1.offset| 0) (= |ULTIMATE.start_sll_append_~head#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_node_create_with_sublist_~sublist_length#1| 3) (= |ULTIMATE.start_node_create_with_sublist_~new_node~0#1.offset| 0) (= 3 |ULTIMATE.start_main_~min~0#1|) (<= 2 |ULTIMATE.start_sll_append_~head#1.base|) (<= 2 |ULTIMATE.start_main_~#head~1#1.base|) (= |ULTIMATE.start_main_~j~0#1| 0) (<= (select |#length| |ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base|) 7) (= |ULTIMATE.start_sll_append_#in~head#1.offset| 0) (= 0 |ULTIMATE.start_node_create_with_sublist_#t~ret6#1.offset|))' at error location [2023-11-12 00:55:25,648 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:55:25,648 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:55:25,648 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 5] total 10 [2023-11-12 00:55:25,649 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666235353] [2023-11-12 00:55:25,649 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:55:25,649 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-12 00:55:25,649 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:25,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-12 00:55:25,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2023-11-12 00:55:25,650 INFO L87 Difference]: Start difference. First operand 148 states and 197 transitions. Second operand has 11 states, 10 states have (on average 3.5) internal successors, (35), 11 states have internal predecessors, (35), 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) [2023-11-12 00:55:26,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:26,024 INFO L93 Difference]: Finished difference Result 146 states and 191 transitions. [2023-11-12 00:55:26,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:55:26,025 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.5) internal successors, (35), 11 states have internal predecessors, (35), 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 17 [2023-11-12 00:55:26,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:26,026 INFO L225 Difference]: With dead ends: 146 [2023-11-12 00:55:26,026 INFO L226 Difference]: Without dead ends: 146 [2023-11-12 00:55:26,027 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=92, Invalid=328, Unknown=0, NotChecked=0, Total=420 [2023-11-12 00:55:26,027 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 3 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 270 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 270 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:26,028 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 262 Invalid, 272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 270 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:55:26,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2023-11-12 00:55:26,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 146. [2023-11-12 00:55:26,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 114 states have (on average 1.6754385964912282) internal successors, (191), 145 states have internal predecessors, (191), 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) [2023-11-12 00:55:26,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 191 transitions. [2023-11-12 00:55:26,032 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 191 transitions. Word has length 17 [2023-11-12 00:55:26,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:26,032 INFO L495 AbstractCegarLoop]: Abstraction has 146 states and 191 transitions. [2023-11-12 00:55:26,032 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.5) internal successors, (35), 11 states have internal predecessors, (35), 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) [2023-11-12 00:55:26,032 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 191 transitions. [2023-11-12 00:55:26,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-12 00:55:26,033 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:26,033 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:26,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 00:55:26,238 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-12 00:55:26,238 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-12 00:55:26,238 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:26,239 INFO L85 PathProgramCache]: Analyzing trace with hash -1620570738, now seen corresponding path program 1 times [2023-11-12 00:55:26,239 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:26,239 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1285689811] [2023-11-12 00:55:26,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:26,239 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:26,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:26,297 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-12 00:55:26,297 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:26,297 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1285689811] [2023-11-12 00:55:26,297 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1285689811] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:55:26,297 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:55:26,298 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:55:26,298 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896338977] [2023-11-12 00:55:26,298 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:55:26,298 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:55:26,298 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:26,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:55:26,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:55:26,299 INFO L87 Difference]: Start difference. First operand 146 states and 191 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:26,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:26,398 INFO L93 Difference]: Finished difference Result 201 states and 252 transitions. [2023-11-12 00:55:26,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:55:26,399 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-12 00:55:26,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:26,400 INFO L225 Difference]: With dead ends: 201 [2023-11-12 00:55:26,400 INFO L226 Difference]: Without dead ends: 201 [2023-11-12 00:55:26,401 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:55:26,401 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 87 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:26,402 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 176 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:55:26,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2023-11-12 00:55:26,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 161. [2023-11-12 00:55:26,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 129 states have (on average 1.627906976744186) internal successors, (210), 160 states have internal predecessors, (210), 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) [2023-11-12 00:55:26,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 210 transitions. [2023-11-12 00:55:26,406 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 210 transitions. Word has length 19 [2023-11-12 00:55:26,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:26,407 INFO L495 AbstractCegarLoop]: Abstraction has 161 states and 210 transitions. [2023-11-12 00:55:26,407 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:26,407 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 210 transitions. [2023-11-12 00:55:26,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-12 00:55:26,408 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:26,408 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:26,408 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-12 00:55:26,408 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr28REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-12 00:55:26,409 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:26,409 INFO L85 PathProgramCache]: Analyzing trace with hash -1615547465, now seen corresponding path program 1 times [2023-11-12 00:55:26,409 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:26,409 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579615369] [2023-11-12 00:55:26,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:26,410 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:26,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:26,482 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-12 00:55:26,482 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:26,482 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579615369] [2023-11-12 00:55:26,482 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1579615369] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:55:26,482 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:55:26,483 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:55:26,483 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39256076] [2023-11-12 00:55:26,483 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:55:26,483 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:55:26,483 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:26,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:55:26,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:55:26,484 INFO L87 Difference]: Start difference. First operand 161 states and 210 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:26,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:26,580 INFO L93 Difference]: Finished difference Result 179 states and 228 transitions. [2023-11-12 00:55:26,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:55:26,580 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-12 00:55:26,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:26,582 INFO L225 Difference]: With dead ends: 179 [2023-11-12 00:55:26,582 INFO L226 Difference]: Without dead ends: 179 [2023-11-12 00:55:26,582 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:55:26,583 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 6 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:26,583 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 192 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:55:26,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2023-11-12 00:55:26,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 164. [2023-11-12 00:55:26,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 132 states have (on average 1.6136363636363635) internal successors, (213), 163 states have internal predecessors, (213), 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) [2023-11-12 00:55:26,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 213 transitions. [2023-11-12 00:55:26,588 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 213 transitions. Word has length 19 [2023-11-12 00:55:26,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:26,588 INFO L495 AbstractCegarLoop]: Abstraction has 164 states and 213 transitions. [2023-11-12 00:55:26,588 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:26,588 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 213 transitions. [2023-11-12 00:55:26,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-12 00:55:26,589 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:26,589 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:26,589 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-11-12 00:55:26,589 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr41ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-12 00:55:26,590 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:26,590 INFO L85 PathProgramCache]: Analyzing trace with hash -1615544872, now seen corresponding path program 1 times [2023-11-12 00:55:26,590 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:26,590 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [350409970] [2023-11-12 00:55:26,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:26,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:26,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:26,733 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-12 00:55:26,733 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:26,733 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [350409970] [2023-11-12 00:55:26,733 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [350409970] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:55:26,733 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:55:26,734 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:55:26,734 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886148404] [2023-11-12 00:55:26,734 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:55:26,734 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:55:26,734 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:26,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:55:26,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:55:26,735 INFO L87 Difference]: Start difference. First operand 164 states and 213 transitions. Second operand has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:26,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:26,844 INFO L93 Difference]: Finished difference Result 165 states and 213 transitions. [2023-11-12 00:55:26,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:55:26,844 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-12 00:55:26,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:26,846 INFO L225 Difference]: With dead ends: 165 [2023-11-12 00:55:26,846 INFO L226 Difference]: Without dead ends: 160 [2023-11-12 00:55:26,846 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:55:26,847 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 0 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:26,847 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 163 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:55:26,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2023-11-12 00:55:26,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 158. [2023-11-12 00:55:26,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 126 states have (on average 1.6349206349206349) internal successors, (206), 157 states have internal predecessors, (206), 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) [2023-11-12 00:55:26,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 206 transitions. [2023-11-12 00:55:26,852 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 206 transitions. Word has length 19 [2023-11-12 00:55:26,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:26,852 INFO L495 AbstractCegarLoop]: Abstraction has 158 states and 206 transitions. [2023-11-12 00:55:26,852 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:26,852 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 206 transitions. [2023-11-12 00:55:26,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-12 00:55:26,853 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:26,853 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:26,853 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-11-12 00:55:26,854 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-12 00:55:26,855 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:26,855 INFO L85 PathProgramCache]: Analyzing trace with hash 1560858105, now seen corresponding path program 1 times [2023-11-12 00:55:26,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:26,855 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533590146] [2023-11-12 00:55:26,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:26,855 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:26,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:26,995 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:55:26,995 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:26,995 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533590146] [2023-11-12 00:55:26,996 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1533590146] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:55:26,996 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:55:26,996 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:55:26,996 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421563991] [2023-11-12 00:55:26,996 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:55:26,997 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:55:26,997 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:26,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:55:26,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:55:26,998 INFO L87 Difference]: Start difference. First operand 158 states and 206 transitions. Second operand has 4 states, 3 states have (on average 4.333333333333333) internal successors, (13), 4 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) [2023-11-12 00:55:27,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:27,091 INFO L93 Difference]: Finished difference Result 157 states and 203 transitions. [2023-11-12 00:55:27,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:55:27,092 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.333333333333333) internal successors, (13), 4 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 19 [2023-11-12 00:55:27,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:27,093 INFO L225 Difference]: With dead ends: 157 [2023-11-12 00:55:27,093 INFO L226 Difference]: Without dead ends: 157 [2023-11-12 00:55:27,093 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:55:27,094 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 26 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:27,094 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 136 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:55:27,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2023-11-12 00:55:27,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2023-11-12 00:55:27,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 126 states have (on average 1.6111111111111112) internal successors, (203), 156 states have internal predecessors, (203), 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) [2023-11-12 00:55:27,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 203 transitions. [2023-11-12 00:55:27,099 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 203 transitions. Word has length 19 [2023-11-12 00:55:27,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:27,099 INFO L495 AbstractCegarLoop]: Abstraction has 157 states and 203 transitions. [2023-11-12 00:55:27,099 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.333333333333333) internal successors, (13), 4 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) [2023-11-12 00:55:27,099 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 203 transitions. [2023-11-12 00:55:27,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-12 00:55:27,101 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:27,101 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:27,101 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-11-12 00:55:27,102 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-12 00:55:27,102 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:27,102 INFO L85 PathProgramCache]: Analyzing trace with hash 1560858106, now seen corresponding path program 1 times [2023-11-12 00:55:27,102 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:27,102 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723264749] [2023-11-12 00:55:27,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:27,103 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:27,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:27,263 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:55:27,263 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:27,264 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723264749] [2023-11-12 00:55:27,264 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723264749] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:55:27,264 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:55:27,264 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 00:55:27,264 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [856208541] [2023-11-12 00:55:27,264 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:55:27,265 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:55:27,265 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:27,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:55:27,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:55:27,266 INFO L87 Difference]: Start difference. First operand 157 states and 203 transitions. Second operand has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 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) [2023-11-12 00:55:27,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:27,356 INFO L93 Difference]: Finished difference Result 156 states and 200 transitions. [2023-11-12 00:55:27,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:55:27,356 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 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 19 [2023-11-12 00:55:27,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:27,357 INFO L225 Difference]: With dead ends: 156 [2023-11-12 00:55:27,357 INFO L226 Difference]: Without dead ends: 156 [2023-11-12 00:55:27,358 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:55:27,358 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 25 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:27,359 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 152 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:55:27,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2023-11-12 00:55:27,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 156. [2023-11-12 00:55:27,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 126 states have (on average 1.5873015873015872) internal successors, (200), 155 states have internal predecessors, (200), 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) [2023-11-12 00:55:27,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 200 transitions. [2023-11-12 00:55:27,363 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 200 transitions. Word has length 19 [2023-11-12 00:55:27,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:27,363 INFO L495 AbstractCegarLoop]: Abstraction has 156 states and 200 transitions. [2023-11-12 00:55:27,363 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 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) [2023-11-12 00:55:27,363 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 200 transitions. [2023-11-12 00:55:27,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-12 00:55:27,364 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:27,364 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:27,364 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-11-12 00:55:27,364 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-12 00:55:27,365 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:27,365 INFO L85 PathProgramCache]: Analyzing trace with hash 1141961048, now seen corresponding path program 1 times [2023-11-12 00:55:27,365 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:27,365 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [263143570] [2023-11-12 00:55:27,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:27,371 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:27,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:27,809 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-12 00:55:27,809 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:27,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [263143570] [2023-11-12 00:55:27,810 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [263143570] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:55:27,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1286282931] [2023-11-12 00:55:27,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:27,810 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:27,810 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:55:27,811 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:55:27,837 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 00:55:27,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:27,946 INFO L262 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-12 00:55:27,948 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:55:27,966 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 8 treesize of output 1 [2023-11-12 00:55:28,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:55:28,012 INFO L351 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 [2023-11-12 00:55:28,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:55:28,044 INFO L351 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 [2023-11-12 00:55:28,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:55:28,074 INFO L351 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 [2023-11-12 00:55:28,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:55:28,099 INFO L351 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 [2023-11-12 00:55:28,123 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-12 00:55:28,123 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:55:30,280 WARN L854 $PredicateComparison]: unable to prove that (and (<= 0 |c_ULTIMATE.start_sll_append_~head#1.offset|) (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| Int)) (or (forall ((v_ArrVal_355 Int) (|v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| 1)) (forall ((v_ArrVal_356 Int)) (<= (+ |c_ULTIMATE.start_sll_append_~head#1.offset| 4) (select (store (store |c_#length| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| v_ArrVal_355) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| v_ArrVal_356) |c_ULTIMATE.start_sll_append_~head#1.base|))))) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| 1))))) is different from false [2023-11-12 00:55:32,368 WARN L854 $PredicateComparison]: unable to prove that (and (<= 0 |c_ULTIMATE.start_sll_append_~head#1.offset|) (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_48| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_48| 1)) (forall ((v_ArrVal_354 Int) (|v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| Int)) (or (forall ((v_ArrVal_355 Int) (|v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| 1)) (forall ((v_ArrVal_356 Int)) (<= (+ |c_ULTIMATE.start_sll_append_~head#1.offset| 4) (select (store (store (store |c_#length| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_48| v_ArrVal_354) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| v_ArrVal_355) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| v_ArrVal_356) |c_ULTIMATE.start_sll_append_~head#1.base|))))) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| 1))))))) is different from false [2023-11-12 00:55:34,515 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((|v_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base_24| Int)) (or (forall ((v_ArrVal_353 Int) (|v_ULTIMATE.start_sll_create_~new_head~0#1.base_48| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_48| 1)) (forall ((v_ArrVal_354 Int) (|v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| Int)) (or (forall ((v_ArrVal_355 Int) (|v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| 1)) (forall ((v_ArrVal_356 Int)) (<= (+ 4 |c_ULTIMATE.start_main_~#head~1#1.offset|) (select (store (store (store (store |c_#length| |v_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base_24| v_ArrVal_353) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_48| v_ArrVal_354) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| v_ArrVal_355) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| v_ArrVal_356) |c_ULTIMATE.start_main_~#head~1#1.base|))))) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| 1)))))) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base_24| 1)))) (<= 0 |c_ULTIMATE.start_main_~#head~1#1.offset|)) is different from false [2023-11-12 00:55:34,604 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 9 not checked. [2023-11-12 00:55:34,605 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1286282931] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:55:34,605 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2031437249] [2023-11-12 00:55:34,607 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-12 00:55:34,608 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:55:34,608 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:55:34,608 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:55:34,608 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:55:35,756 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:55:37,127 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5149#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_#memory_int_57| (Array Int (Array Int Int))) (|v_#memory_int_58| (Array Int (Array Int Int))) (|v_#memory_int_59| (Array Int (Array Int Int)))) (and (= (store |v_#memory_int_58| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (select |v_#memory_int_58| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 0 (select (select |v_#memory_int_59| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 0))) |v_#memory_int_59|) (= |v_#memory_int_58| (store |v_#memory_int_57| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (select |v_#memory_int_57| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 (select (select |v_#memory_int_58| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4)))) (= |#memory_int| (store |v_#memory_int_59| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select |v_#memory_int_59| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 (select (select |#memory_int| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0)))))) (= (select |#valid| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 1) (= 3 |ULTIMATE.start_sll_append_#in~sublist_length#1|) (exists ((|v_#memory_$Pointer$.base_90| (Array Int (Array Int Int)))) (= (store (store |v_#memory_$Pointer$.base_90| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.base_90| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 |ULTIMATE.start_sll_create_#res#1.base|) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select (store |v_#memory_$Pointer$.base_90| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.base_90| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 |ULTIMATE.start_sll_create_#res#1.base|) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 0)) |#memory_$Pointer$.base|)) (= |ULTIMATE.start_node_create_with_sublist_#res#1.offset| 0) (= |ULTIMATE.start_sll_append_~sublist_length#1| 3) (= 3 |ULTIMATE.start_main_~i~0#1|) (= 5 |ULTIMATE.start_main_~max~0#1|) (<= 2 |ULTIMATE.start_sll_append_#in~head#1.base|) (= |ULTIMATE.start_main_~#head~1#1.offset| 0) (= |ULTIMATE.start_sll_append_~head#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= 3 |ULTIMATE.start_main_~min~0#1|) (<= 2 |ULTIMATE.start_sll_append_~head#1.base|) (<= 2 |ULTIMATE.start_main_~#head~1#1.base|) (exists ((|v_#memory_$Pointer$.offset_90| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store (store |v_#memory_$Pointer$.offset_90| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.offset_90| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 0) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select (store |v_#memory_$Pointer$.offset_90| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.offset_90| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 0) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 0)))) (= |ULTIMATE.start_sll_append_~new_last~0#1.offset| 0) (<= (select |#length| |ULTIMATE.start_sll_append_~head#1.base|) 3) (<= 8 (select |#length| |ULTIMATE.start_node_create_with_sublist_#res#1.base|)) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_sll_append_#in~head#1.offset| 0) (= |ULTIMATE.start_node_create_with_sublist_#res#1.base| |ULTIMATE.start_sll_append_~new_last~0#1.base|))' at error location [2023-11-12 00:55:37,127 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:55:37,127 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:55:37,127 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 5] total 9 [2023-11-12 00:55:37,127 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219839490] [2023-11-12 00:55:37,127 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:55:37,128 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-12 00:55:37,128 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:37,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-12 00:55:37,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=253, Unknown=3, NotChecked=102, Total=420 [2023-11-12 00:55:37,129 INFO L87 Difference]: Start difference. First operand 156 states and 200 transitions. Second operand has 11 states, 10 states have (on average 4.1) internal successors, (41), 10 states have internal predecessors, (41), 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) [2023-11-12 00:55:37,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:37,425 INFO L93 Difference]: Finished difference Result 177 states and 219 transitions. [2023-11-12 00:55:37,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:55:37,426 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 4.1) internal successors, (41), 10 states have internal predecessors, (41), 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 20 [2023-11-12 00:55:37,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:37,427 INFO L225 Difference]: With dead ends: 177 [2023-11-12 00:55:37,428 INFO L226 Difference]: Without dead ends: 177 [2023-11-12 00:55:37,428 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=71, Invalid=280, Unknown=3, NotChecked=108, Total=462 [2023-11-12 00:55:37,429 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 228 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 330 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:37,429 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [228 Valid, 92 Invalid, 485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 150 Invalid, 0 Unknown, 330 Unchecked, 0.2s Time] [2023-11-12 00:55:37,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2023-11-12 00:55:37,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 154. [2023-11-12 00:55:37,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 126 states have (on average 1.5396825396825398) internal successors, (194), 153 states have internal predecessors, (194), 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) [2023-11-12 00:55:37,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 194 transitions. [2023-11-12 00:55:37,434 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 194 transitions. Word has length 20 [2023-11-12 00:55:37,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:37,435 INFO L495 AbstractCegarLoop]: Abstraction has 154 states and 194 transitions. [2023-11-12 00:55:37,435 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 4.1) internal successors, (41), 10 states have internal predecessors, (41), 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) [2023-11-12 00:55:37,435 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 194 transitions. [2023-11-12 00:55:37,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-12 00:55:37,436 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:37,436 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:37,450 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-12 00:55:37,642 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-12 00:55:37,642 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-12 00:55:37,643 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:37,643 INFO L85 PathProgramCache]: Analyzing trace with hash 1141961047, now seen corresponding path program 1 times [2023-11-12 00:55:37,643 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:37,643 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [148747591] [2023-11-12 00:55:37,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:37,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:37,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:37,927 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 00:55:37,928 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:37,928 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [148747591] [2023-11-12 00:55:37,928 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [148747591] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:55:37,928 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2121394941] [2023-11-12 00:55:37,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:37,928 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:37,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:55:37,930 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:55:37,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 00:55:38,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:38,061 INFO L262 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-12 00:55:38,066 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:55:38,071 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 [2023-11-12 00:55:38,100 INFO L322 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-12 00:55:38,100 INFO L351 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 [2023-11-12 00:55:38,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:55:38,137 INFO L351 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 [2023-11-12 00:55:38,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:55:38,175 INFO L351 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 [2023-11-12 00:55:38,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:55:38,207 INFO L351 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 [2023-11-12 00:55:38,235 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-12 00:55:38,235 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:55:59,748 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:55:59,748 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2121394941] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:55:59,748 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [711362739] [2023-11-12 00:55:59,751 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-12 00:55:59,751 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:55:59,751 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:55:59,751 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:55:59,752 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:56:00,520 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:56:01,934 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5623#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_#memory_int_69| (Array Int (Array Int Int))) (|v_#memory_int_70| (Array Int (Array Int Int))) (|v_#memory_int_71| (Array Int (Array Int Int)))) (and (= |v_#memory_int_71| (store |v_#memory_int_70| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (select |v_#memory_int_70| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 0 (select (select |v_#memory_int_71| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 0)))) (= |v_#memory_int_70| (store |v_#memory_int_69| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (select |v_#memory_int_69| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 (select (select |v_#memory_int_70| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4)))) (= |#memory_int| (store |v_#memory_int_71| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select |v_#memory_int_71| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 (select (select |#memory_int| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0)))))) (= 3 |ULTIMATE.start_sll_append_#in~sublist_length#1|) (= |ULTIMATE.start_node_create_with_sublist_#res#1.offset| 0) (= |ULTIMATE.start_sll_append_~sublist_length#1| 3) (= 3 |ULTIMATE.start_main_~i~0#1|) (= 5 |ULTIMATE.start_main_~max~0#1|) (<= 2 |ULTIMATE.start_sll_append_#in~head#1.base|) (exists ((|v_#memory_$Pointer$.offset_102| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store (store |v_#memory_$Pointer$.offset_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.offset_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 0) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select (store |v_#memory_$Pointer$.offset_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.offset_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 0) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 0)))) (= |ULTIMATE.start_main_~#head~1#1.offset| 0) (= |ULTIMATE.start_sll_append_~head#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= 3 |ULTIMATE.start_main_~min~0#1|) (= (select |#valid| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 1) (<= 2 |ULTIMATE.start_sll_append_~head#1.base|) (<= 2 |ULTIMATE.start_main_~#head~1#1.base|) (exists ((|v_#memory_$Pointer$.base_102| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store (store |v_#memory_$Pointer$.base_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.base_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 |ULTIMATE.start_sll_create_#res#1.base|) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select (store |v_#memory_$Pointer$.base_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.base_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 |ULTIMATE.start_sll_create_#res#1.base|) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 0)))) (= |ULTIMATE.start_sll_append_~new_last~0#1.offset| 0) (<= 8 (select |#length| |ULTIMATE.start_node_create_with_sublist_#res#1.base|)) (= |ULTIMATE.start_main_~j~0#1| 0) (not (= (select |#valid| |ULTIMATE.start_sll_append_~head#1.base|) 1)) (= |ULTIMATE.start_sll_append_#in~head#1.offset| 0) (= |ULTIMATE.start_node_create_with_sublist_#res#1.base| |ULTIMATE.start_sll_append_~new_last~0#1.base|))' at error location [2023-11-12 00:56:01,934 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:56:01,934 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:56:01,934 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 12 [2023-11-12 00:56:01,935 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899670157] [2023-11-12 00:56:01,935 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:56:01,935 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-12 00:56:01,935 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:56:01,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-12 00:56:01,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=458, Unknown=5, NotChecked=0, Total=552 [2023-11-12 00:56:01,937 INFO L87 Difference]: Start difference. First operand 154 states and 194 transitions. Second operand has 14 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 13 states have internal predecessors, (46), 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) [2023-11-12 00:56:02,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:56:02,270 INFO L93 Difference]: Finished difference Result 175 states and 213 transitions. [2023-11-12 00:56:02,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:56:02,271 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 13 states have internal predecessors, (46), 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 20 [2023-11-12 00:56:02,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:56:02,272 INFO L225 Difference]: With dead ends: 175 [2023-11-12 00:56:02,272 INFO L226 Difference]: Without dead ends: 175 [2023-11-12 00:56:02,272 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 22.8s TimeCoverageRelationStatistics Valid=104, Invalid=491, Unknown=5, NotChecked=0, Total=600 [2023-11-12 00:56:02,273 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 218 mSDsluCounter, 159 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:56:02,273 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [218 Valid, 200 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:56:02,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2023-11-12 00:56:02,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 152. [2023-11-12 00:56:02,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 126 states have (on average 1.492063492063492) internal successors, (188), 151 states have internal predecessors, (188), 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) [2023-11-12 00:56:02,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 188 transitions. [2023-11-12 00:56:02,279 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 188 transitions. Word has length 20 [2023-11-12 00:56:02,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:56:02,279 INFO L495 AbstractCegarLoop]: Abstraction has 152 states and 188 transitions. [2023-11-12 00:56:02,279 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 13 states have internal predecessors, (46), 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) [2023-11-12 00:56:02,279 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 188 transitions. [2023-11-12 00:56:02,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-12 00:56:02,280 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:56:02,280 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:56:02,293 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-12 00:56:02,483 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:56:02,483 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-12 00:56:02,483 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:56:02,484 INFO L85 PathProgramCache]: Analyzing trace with hash -2086872481, now seen corresponding path program 1 times [2023-11-12 00:56:02,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:56:02,484 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1143408558] [2023-11-12 00:56:02,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:02,485 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:56:02,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:03,206 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-12 00:56:03,206 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:56:03,206 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1143408558] [2023-11-12 00:56:03,206 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1143408558] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:56:03,206 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1269692351] [2023-11-12 00:56:03,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:03,207 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:56:03,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:56:03,208 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:56:03,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99ceb2ae-0ec7-49dd-95bc-9eb20917dc7b/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 00:56:03,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:03,358 INFO L262 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 51 conjunts are in the unsatisfiable core [2023-11-12 00:56:03,363 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:56:03,376 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 [2023-11-12 00:56:03,461 INFO L322 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-12 00:56:03,462 INFO L351 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 [2023-11-12 00:56:03,653 INFO L322 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2023-11-12 00:56:03,653 INFO L351 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 1 case distinctions, treesize of input 19 treesize of output 18 [2023-11-12 00:56:03,670 INFO L322 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2023-11-12 00:56:03,670 INFO L351 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 1 case distinctions, treesize of input 19 treesize of output 18 [2023-11-12 00:56:03,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:56:03,789 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 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 [2023-11-12 00:56:03,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:56:03,798 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 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 [2023-11-12 00:56:03,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:56:03,888 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 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 [2023-11-12 00:56:03,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:56:03,895 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 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 [2023-11-12 00:56:03,933 INFO L351 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 [2023-11-12 00:56:03,941 INFO L351 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 [2023-11-12 00:56:03,956 INFO L351 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 [2023-11-12 00:56:03,961 INFO L351 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 [2023-11-12 00:56:03,999 INFO L351 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 [2023-11-12 00:56:04,005 INFO L351 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 [2023-11-12 00:56:04,039 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:56:04,039 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:56:04,057 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_557 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_append_~new_last~0#1.base| v_ArrVal_557) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0)) (forall ((v_ArrVal_558 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_append_~new_last~0#1.base| v_ArrVal_558) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0))) is different from false [2023-11-12 00:56:04,068 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_557 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_557) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0)) (forall ((v_ArrVal_558 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_558) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0))) is different from false [2023-11-12 00:56:04,093 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_558 (Array Int Int)) (v_ArrVal_552 (Array Int Int))) (= (select (select (store (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_create_~new_head~0#1.base| v_ArrVal_552) |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_558) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0)) (forall ((v_ArrVal_557 (Array Int Int)) (v_ArrVal_551 (Array Int Int))) (= (select (select (store (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_create_~new_head~0#1.base| v_ArrVal_551) |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_557) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0))) is different from false