./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/pthread-divine/ring_2w1r-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version cf1a7837 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a65cbd2-33a9-4926-937f-2d553583c1ad/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a65cbd2-33a9-4926-937f-2d553583c1ad/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_6a65cbd2-33a9-4926-937f-2d553583c1ad/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a65cbd2-33a9-4926-937f-2d553583c1ad/bin/utaipan-verify-NcY6lQBIFX/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/pthread-divine/ring_2w1r-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a65cbd2-33a9-4926-937f-2d553583c1ad/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_6a65cbd2-33a9-4926-937f-2d553583c1ad/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 509c3c8c1895397e4c0d03f6462ad0ca0ed3ce99b40d08b775ab8473dba5ee1f --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:51:07,098 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:51:07,181 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a65cbd2-33a9-4926-937f-2d553583c1ad/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-12 00:51:07,187 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:51:07,188 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:51:07,245 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:51:07,246 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:51:07,246 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:51:07,247 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:51:07,248 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:51:07,249 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:51:07,250 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:51:07,250 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:51:07,251 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:51:07,252 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:51:07,253 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:51:07,253 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:51:07,254 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:51:07,255 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:51:07,255 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:51:07,256 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:51:07,257 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:51:07,258 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-12 00:51:07,258 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-12 00:51:07,259 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:51:07,260 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:51:07,269 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:51:07,269 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:51:07,270 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:51:07,270 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-12 00:51:07,270 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-12 00:51:07,271 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-12 00:51:07,271 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:51:07,271 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-12 00:51:07,272 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-12 00:51:07,272 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:51:07,272 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:51:07,272 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:51:07,273 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:51:07,273 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:51:07,273 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:51:07,274 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:51:07,274 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:51:07,274 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:51:07,274 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:51:07,275 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:51:07,275 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_6a65cbd2-33a9-4926-937f-2d553583c1ad/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a65cbd2-33a9-4926-937f-2d553583c1ad/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 509c3c8c1895397e4c0d03f6462ad0ca0ed3ce99b40d08b775ab8473dba5ee1f [2023-11-12 00:51:07,541 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:51:07,566 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:51:07,570 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:51:07,571 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:51:07,572 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:51:07,573 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a65cbd2-33a9-4926-937f-2d553583c1ad/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/pthread-divine/ring_2w1r-1.i [2023-11-12 00:51:10,718 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:51:11,174 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:51:11,175 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a65cbd2-33a9-4926-937f-2d553583c1ad/sv-benchmarks/c/pthread-divine/ring_2w1r-1.i [2023-11-12 00:51:11,204 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a65cbd2-33a9-4926-937f-2d553583c1ad/bin/utaipan-verify-NcY6lQBIFX/data/a361b67d2/d774b87fcd514c1d9d1ae8cc4ae12d59/FLAG91d4fd475 [2023-11-12 00:51:11,226 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a65cbd2-33a9-4926-937f-2d553583c1ad/bin/utaipan-verify-NcY6lQBIFX/data/a361b67d2/d774b87fcd514c1d9d1ae8cc4ae12d59 [2023-11-12 00:51:11,237 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:51:11,241 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:51:11,245 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:51:11,245 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:51:11,251 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:51:11,252 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:51:11" (1/1) ... [2023-11-12 00:51:11,253 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d205310 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:11, skipping insertion in model container [2023-11-12 00:51:11,254 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:51:11" (1/1) ... [2023-11-12 00:51:11,340 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:51:11,574 WARN L635 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2023-11-12 00:51:12,072 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:51:12,086 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:51:12,114 WARN L635 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2023-11-12 00:51:12,170 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:51:12,251 WARN L672 CHandler]: The function __builtin_bswap16 is called, but not defined or handled by StandardFunctionHandler. [2023-11-12 00:51:12,260 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:51:12,261 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:12 WrapperNode [2023-11-12 00:51:12,262 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:51:12,264 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:51:12,264 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:51:12,264 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:51:12,273 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:12" (1/1) ... [2023-11-12 00:51:12,297 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:12" (1/1) ... [2023-11-12 00:51:12,340 INFO L138 Inliner]: procedures = 310, calls = 77, calls flagged for inlining = 17, calls inlined = 12, statements flattened = 217 [2023-11-12 00:51:12,341 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:51:12,342 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:51:12,342 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:51:12,342 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:51:12,353 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:12" (1/1) ... [2023-11-12 00:51:12,354 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:12" (1/1) ... [2023-11-12 00:51:12,359 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:12" (1/1) ... [2023-11-12 00:51:12,360 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:12" (1/1) ... [2023-11-12 00:51:12,374 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:12" (1/1) ... [2023-11-12 00:51:12,379 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:12" (1/1) ... [2023-11-12 00:51:12,383 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:12" (1/1) ... [2023-11-12 00:51:12,385 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:12" (1/1) ... [2023-11-12 00:51:12,391 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:51:12,392 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:51:12,392 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:51:12,392 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:51:12,393 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:12" (1/1) ... [2023-11-12 00:51:12,401 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:51:12,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a65cbd2-33a9-4926-937f-2d553583c1ad/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:51:12,432 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a65cbd2-33a9-4926-937f-2d553583c1ad/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:51:12,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a65cbd2-33a9-4926-937f-2d553583c1ad/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:51:12,483 INFO L130 BoogieDeclarations]: Found specification of procedure reader_two [2023-11-12 00:51:12,483 INFO L138 BoogieDeclarations]: Found implementation of procedure reader_two [2023-11-12 00:51:12,483 INFO L130 BoogieDeclarations]: Found specification of procedure writer_fn [2023-11-12 00:51:12,483 INFO L138 BoogieDeclarations]: Found implementation of procedure writer_fn [2023-11-12 00:51:12,485 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-12 00:51:12,485 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 00:51:12,486 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 00:51:12,486 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 00:51:12,486 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-11-12 00:51:12,487 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:51:12,487 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:51:12,487 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:51:12,488 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:51:12,490 WARN L210 CfgBuilder]: User set CodeBlockSize to LoopFreeBlock but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-11-12 00:51:12,691 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:51:12,694 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:51:13,398 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:51:13,421 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:51:13,422 INFO L302 CfgBuilder]: Removed 6 assume(true) statements. [2023-11-12 00:51:13,425 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:51:13 BoogieIcfgContainer [2023-11-12 00:51:13,425 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:51:13,431 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:51:13,433 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:51:13,437 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:51:13,438 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:51:11" (1/3) ... [2023-11-12 00:51:13,439 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@435c8b63 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:51:13, skipping insertion in model container [2023-11-12 00:51:13,440 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:12" (2/3) ... [2023-11-12 00:51:13,442 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@435c8b63 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:51:13, skipping insertion in model container [2023-11-12 00:51:13,443 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:51:13" (3/3) ... [2023-11-12 00:51:13,444 INFO L112 eAbstractionObserver]: Analyzing ICFG ring_2w1r-1.i [2023-11-12 00:51:13,468 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:51:13,469 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 61 error locations. [2023-11-12 00:51:13,469 INFO L521 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-11-12 00:51:13,710 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-11-12 00:51:13,760 INFO L115 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2023-11-12 00:51:13,775 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 298 places, 312 transitions, 638 flow [2023-11-12 00:51:13,778 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 298 places, 312 transitions, 638 flow [2023-11-12 00:51:13,780 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 298 places, 312 transitions, 638 flow [2023-11-12 00:51:13,992 INFO L124 PetriNetUnfolderBase]: 21/310 cut-off events. [2023-11-12 00:51:13,992 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-11-12 00:51:14,010 INFO L83 FinitePrefix]: Finished finitePrefix Result has 319 conditions, 310 events. 21/310 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 948 event pairs, 0 based on Foata normal form. 0/228 useless extension candidates. Maximal degree in co-relation 250. Up to 2 conditions per place. [2023-11-12 00:51:14,038 INFO L119 LiptonReduction]: Number of co-enabled transitions 36864 [2023-11-12 00:51:27,598 INFO L134 LiptonReduction]: Checked pairs total: 124218 [2023-11-12 00:51:27,599 INFO L136 LiptonReduction]: Total number of compositions: 342 [2023-11-12 00:51:27,610 INFO L113 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 116 places, 120 transitions, 254 flow [2023-11-12 00:51:28,986 INFO L135 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 24038 states, 19081 states have (on average 4.0931816990723755) internal successors, (78102), 24037 states have internal predecessors, (78102), 0 states have call successors, (0), 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 00:51:29,016 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:51:29,026 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;@78c0c189, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:51:29,026 INFO L358 AbstractCegarLoop]: Starting to check reachability of 99 error locations. [2023-11-12 00:51:29,158 INFO L276 IsEmpty]: Start isEmpty. Operand has 24038 states, 19081 states have (on average 4.0931816990723755) internal successors, (78102), 24037 states have internal predecessors, (78102), 0 states have call successors, (0), 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 00:51:29,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2 [2023-11-12 00:51:29,164 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:51:29,165 INFO L195 NwaCegarLoop]: trace histogram [1] [2023-11-12 00:51:29,166 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-12 00:51:29,175 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:51:29,176 INFO L85 PathProgramCache]: Analyzing trace with hash 1253, now seen corresponding path program 1 times [2023-11-12 00:51:29,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:51:29,188 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1210128564] [2023-11-12 00:51:29,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:29,189 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:51:29,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:29,359 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 00:51:29,360 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:51:29,361 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1210128564] [2023-11-12 00:51:29,362 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1210128564] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:51:29,363 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:51:29,363 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [0] imperfect sequences [] total 0 [2023-11-12 00:51:29,365 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773129399] [2023-11-12 00:51:29,365 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:51:29,370 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-12 00:51:29,371 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:51:29,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-12 00:51:29,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-12 00:51:29,451 INFO L87 Difference]: Start difference. First operand has 24038 states, 19081 states have (on average 4.0931816990723755) internal successors, (78102), 24037 states have internal predecessors, (78102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 1 states have (on average 1.0) internal successors, (1), 1 states have internal predecessors, (1), 0 states have call successors, (0), 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 00:51:30,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:51:30,172 INFO L93 Difference]: Finished difference Result 19244 states and 60216 transitions. [2023-11-12 00:51:30,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-12 00:51:30,175 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 1 states have (on average 1.0) internal successors, (1), 1 states have internal predecessors, (1), 0 states have call successors, (0), 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 1 [2023-11-12 00:51:30,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:51:30,496 INFO L225 Difference]: With dead ends: 19244 [2023-11-12 00:51:30,497 INFO L226 Difference]: Without dead ends: 19244 [2023-11-12 00:51:30,497 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 0 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-12 00:51:30,502 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:51:30,504 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 39 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:51:30,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19244 states. [2023-11-12 00:51:31,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19244 to 19244. [2023-11-12 00:51:31,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19244 states, 16066 states have (on average 3.748039337731856) internal successors, (60216), 19243 states have internal predecessors, (60216), 0 states have call successors, (0), 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 00:51:31,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19244 states to 19244 states and 60216 transitions. [2023-11-12 00:51:31,803 INFO L78 Accepts]: Start accepts. Automaton has 19244 states and 60216 transitions. Word has length 1 [2023-11-12 00:51:31,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:51:31,804 INFO L495 AbstractCegarLoop]: Abstraction has 19244 states and 60216 transitions. [2023-11-12 00:51:31,805 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 1 states have (on average 1.0) internal successors, (1), 1 states have internal predecessors, (1), 0 states have call successors, (0), 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 00:51:31,805 INFO L276 IsEmpty]: Start isEmpty. Operand 19244 states and 60216 transitions. [2023-11-12 00:51:31,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-12 00:51:31,806 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:51:31,806 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-12 00:51:31,806 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:51:31,807 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-12 00:51:31,807 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:51:31,807 INFO L85 PathProgramCache]: Analyzing trace with hash 1238864, now seen corresponding path program 1 times [2023-11-12 00:51:31,808 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:51:31,808 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [783344037] [2023-11-12 00:51:31,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:31,809 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:51:31,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:32,216 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 00:51:32,216 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:51:32,217 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [783344037] [2023-11-12 00:51:32,217 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [783344037] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:51:32,217 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:51:32,217 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:51:32,218 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570618161] [2023-11-12 00:51:32,218 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:51:32,219 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:51:32,219 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:51:32,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:51:32,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:51:32,221 INFO L87 Difference]: Start difference. First operand 19244 states and 60216 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:32,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:51:32,824 INFO L93 Difference]: Finished difference Result 19243 states and 60214 transitions. [2023-11-12 00:51:32,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:51:32,825 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-11-12 00:51:32,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:51:32,948 INFO L225 Difference]: With dead ends: 19243 [2023-11-12 00:51:32,948 INFO L226 Difference]: Without dead ends: 19243 [2023-11-12 00:51:32,949 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:51:32,950 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 52 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 227 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:51:32,951 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 63 Invalid, 227 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:51:33,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19243 states. [2023-11-12 00:51:33,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19243 to 19243. [2023-11-12 00:51:33,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19243 states, 16065 states have (on average 3.748148148148148) internal successors, (60214), 19242 states have internal predecessors, (60214), 0 states have call successors, (0), 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 00:51:34,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19243 states to 19243 states and 60214 transitions. [2023-11-12 00:51:34,122 INFO L78 Accepts]: Start accepts. Automaton has 19243 states and 60214 transitions. Word has length 3 [2023-11-12 00:51:34,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:51:34,123 INFO L495 AbstractCegarLoop]: Abstraction has 19243 states and 60214 transitions. [2023-11-12 00:51:34,125 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:34,125 INFO L276 IsEmpty]: Start isEmpty. Operand 19243 states and 60214 transitions. [2023-11-12 00:51:34,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-12 00:51:34,126 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:51:34,126 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-12 00:51:34,126 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-12 00:51:34,127 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-12 00:51:34,128 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:51:34,129 INFO L85 PathProgramCache]: Analyzing trace with hash 1238865, now seen corresponding path program 1 times [2023-11-12 00:51:34,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:51:34,139 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283735350] [2023-11-12 00:51:34,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:34,140 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:51:34,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:34,252 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 00:51:34,252 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:51:34,253 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [283735350] [2023-11-12 00:51:34,254 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [283735350] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:51:34,255 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:51:34,262 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 00:51:34,262 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574738185] [2023-11-12 00:51:34,262 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:51:34,263 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:51:34,263 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:51:34,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:51:34,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:51:34,264 INFO L87 Difference]: Start difference. First operand 19243 states and 60214 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:34,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:51:34,830 INFO L93 Difference]: Finished difference Result 19781 states and 61356 transitions. [2023-11-12 00:51:34,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:51:34,831 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-11-12 00:51:34,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:51:34,960 INFO L225 Difference]: With dead ends: 19781 [2023-11-12 00:51:34,960 INFO L226 Difference]: Without dead ends: 19781 [2023-11-12 00:51:34,961 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 00:51:34,964 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 90 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-12 00:51:34,965 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 33 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-12 00:51:35,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19781 states. [2023-11-12 00:51:35,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19781 to 19451. [2023-11-12 00:51:35,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19451 states, 16288 states have (on average 3.7457637524557956) internal successors, (61011), 19450 states have internal predecessors, (61011), 0 states have call successors, (0), 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 00:51:35,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19451 states to 19451 states and 61011 transitions. [2023-11-12 00:51:35,972 INFO L78 Accepts]: Start accepts. Automaton has 19451 states and 61011 transitions. Word has length 3 [2023-11-12 00:51:35,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:51:35,973 INFO L495 AbstractCegarLoop]: Abstraction has 19451 states and 61011 transitions. [2023-11-12 00:51:35,974 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:35,974 INFO L276 IsEmpty]: Start isEmpty. Operand 19451 states and 61011 transitions. [2023-11-12 00:51:35,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-12 00:51:35,974 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:51:35,975 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-12 00:51:35,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-12 00:51:35,975 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-12 00:51:35,976 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:51:35,976 INFO L85 PathProgramCache]: Analyzing trace with hash 38404826, now seen corresponding path program 1 times [2023-11-12 00:51:35,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:51:35,976 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533852431] [2023-11-12 00:51:35,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:35,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:51:36,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:36,301 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 00:51:36,302 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:51:36,302 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533852431] [2023-11-12 00:51:36,304 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1533852431] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:51:36,304 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:51:36,305 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:51:36,308 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936522092] [2023-11-12 00:51:36,308 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:51:36,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:51:36,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:51:36,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:51:36,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:51:36,310 INFO L87 Difference]: Start difference. First operand 19451 states and 61011 transitions. Second operand has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:36,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:51:36,911 INFO L93 Difference]: Finished difference Result 19394 states and 60872 transitions. [2023-11-12 00:51:36,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:51:36,912 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-12 00:51:36,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:51:37,021 INFO L225 Difference]: With dead ends: 19394 [2023-11-12 00:51:37,021 INFO L226 Difference]: Without dead ends: 19394 [2023-11-12 00:51:37,021 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:51:37,022 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 143 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:51:37,023 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [143 Valid, 63 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:51:37,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19394 states. [2023-11-12 00:51:37,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19394 to 19394. [2023-11-12 00:51:37,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19394 states, 16260 states have (on average 3.7436654366543665) internal successors, (60872), 19393 states have internal predecessors, (60872), 0 states have call successors, (0), 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 00:51:37,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19394 states to 19394 states and 60872 transitions. [2023-11-12 00:51:37,771 INFO L78 Accepts]: Start accepts. Automaton has 19394 states and 60872 transitions. Word has length 4 [2023-11-12 00:51:37,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:51:37,772 INFO L495 AbstractCegarLoop]: Abstraction has 19394 states and 60872 transitions. [2023-11-12 00:51:37,772 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:37,772 INFO L276 IsEmpty]: Start isEmpty. Operand 19394 states and 60872 transitions. [2023-11-12 00:51:37,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-12 00:51:37,773 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:51:37,774 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-12 00:51:37,774 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-12 00:51:37,774 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-12 00:51:37,775 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:51:37,775 INFO L85 PathProgramCache]: Analyzing trace with hash -1746746611, now seen corresponding path program 1 times [2023-11-12 00:51:37,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:51:37,775 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653937066] [2023-11-12 00:51:37,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:37,775 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:51:37,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:37,851 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 00:51:37,852 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:51:37,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653937066] [2023-11-12 00:51:37,852 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1653937066] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:51:37,852 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:51:37,852 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:51:37,852 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816016026] [2023-11-12 00:51:37,853 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:51:37,853 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:51:37,853 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:51:37,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:51:37,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:51:37,854 INFO L87 Difference]: Start difference. First operand 19394 states and 60872 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:38,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:51:38,413 INFO L93 Difference]: Finished difference Result 35410 states and 111430 transitions. [2023-11-12 00:51:38,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:51:38,413 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-12 00:51:38,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:51:38,600 INFO L225 Difference]: With dead ends: 35410 [2023-11-12 00:51:38,600 INFO L226 Difference]: Without dead ends: 35410 [2023-11-12 00:51:38,600 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 00:51:38,601 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 81 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-12 00:51:38,602 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 102 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-12 00:51:38,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35410 states. [2023-11-12 00:51:39,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35410 to 20208. [2023-11-12 00:51:39,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20208 states, 17074 states have (on average 3.7116668618952793) internal successors, (63373), 20207 states have internal predecessors, (63373), 0 states have call successors, (0), 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 00:51:39,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20208 states to 20208 states and 63373 transitions. [2023-11-12 00:51:39,867 INFO L78 Accepts]: Start accepts. Automaton has 20208 states and 63373 transitions. Word has length 6 [2023-11-12 00:51:39,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:51:39,868 INFO L495 AbstractCegarLoop]: Abstraction has 20208 states and 63373 transitions. [2023-11-12 00:51:39,868 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:39,868 INFO L276 IsEmpty]: Start isEmpty. Operand 20208 states and 63373 transitions. [2023-11-12 00:51:39,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-12 00:51:39,870 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:51:39,870 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:51:39,872 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-12 00:51:39,872 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting writer_fnErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-12 00:51:39,872 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:51:39,873 INFO L85 PathProgramCache]: Analyzing trace with hash 1685318334, now seen corresponding path program 1 times [2023-11-12 00:51:39,873 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:51:39,873 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1536776485] [2023-11-12 00:51:39,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:39,873 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:51:39,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:40,021 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 00:51:40,021 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:51:40,022 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1536776485] [2023-11-12 00:51:40,022 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1536776485] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:51:40,022 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:51:40,022 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 00:51:40,022 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306191308] [2023-11-12 00:51:40,022 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:51:40,023 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-12 00:51:40,023 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:51:40,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-12 00:51:40,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:51:40,024 INFO L87 Difference]: Start difference. First operand 20208 states and 63373 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 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 00:51:41,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:51:41,209 INFO L93 Difference]: Finished difference Result 15258 states and 47555 transitions. [2023-11-12 00:51:41,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 00:51:41,211 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 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 00:51:41,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:51:41,282 INFO L225 Difference]: With dead ends: 15258 [2023-11-12 00:51:41,283 INFO L226 Difference]: Without dead ends: 15258 [2023-11-12 00:51:41,283 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2023-11-12 00:51:41,284 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 346 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 675 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 346 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 695 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 675 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:51:41,284 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [346 Valid, 165 Invalid, 695 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 675 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-12 00:51:41,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15258 states. [2023-11-12 00:51:41,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15258 to 15078. [2023-11-12 00:51:41,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15078 states, 13294 states have (on average 3.561982849405747) internal successors, (47353), 15077 states have internal predecessors, (47353), 0 states have call successors, (0), 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 00:51:41,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15078 states to 15078 states and 47353 transitions. [2023-11-12 00:51:41,777 INFO L78 Accepts]: Start accepts. Automaton has 15078 states and 47353 transitions. Word has length 7 [2023-11-12 00:51:41,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:51:41,778 INFO L495 AbstractCegarLoop]: Abstraction has 15078 states and 47353 transitions. [2023-11-12 00:51:41,778 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 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 00:51:41,779 INFO L276 IsEmpty]: Start isEmpty. Operand 15078 states and 47353 transitions. [2023-11-12 00:51:41,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-12 00:51:41,780 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:51:41,780 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:51:41,780 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-12 00:51:41,780 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting writer_fnErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-12 00:51:41,781 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:51:41,781 INFO L85 PathProgramCache]: Analyzing trace with hash 1685318335, now seen corresponding path program 1 times [2023-11-12 00:51:41,781 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:51:41,781 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [779522261] [2023-11-12 00:51:41,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:41,781 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:51:41,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:41,995 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 00:51:41,995 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:51:41,995 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [779522261] [2023-11-12 00:51:41,995 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [779522261] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:51:41,995 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:51:41,995 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 00:51:41,996 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502276604] [2023-11-12 00:51:41,996 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:51:41,996 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-12 00:51:41,997 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:51:41,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-12 00:51:41,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:51:41,998 INFO L87 Difference]: Start difference. First operand 15078 states and 47353 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 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 00:51:42,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:51:42,825 INFO L93 Difference]: Finished difference Result 14953 states and 46973 transitions. [2023-11-12 00:51:42,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:51:42,827 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 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 00:51:42,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:51:42,889 INFO L225 Difference]: With dead ends: 14953 [2023-11-12 00:51:42,889 INFO L226 Difference]: Without dead ends: 14953 [2023-11-12 00:51:42,890 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2023-11-12 00:51:42,890 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 143 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 446 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 450 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-12 00:51:42,891 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [143 Valid, 122 Invalid, 450 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 446 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-12 00:51:42,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14953 states. [2023-11-12 00:51:43,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14953 to 14953. [2023-11-12 00:51:43,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14953 states, 13169 states have (on average 3.5669375047459946) internal successors, (46973), 14952 states have internal predecessors, (46973), 0 states have call successors, (0), 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 00:51:43,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14953 states to 14953 states and 46973 transitions. [2023-11-12 00:51:43,351 INFO L78 Accepts]: Start accepts. Automaton has 14953 states and 46973 transitions. Word has length 7 [2023-11-12 00:51:43,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:51:43,351 INFO L495 AbstractCegarLoop]: Abstraction has 14953 states and 46973 transitions. [2023-11-12 00:51:43,352 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 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 00:51:43,352 INFO L276 IsEmpty]: Start isEmpty. Operand 14953 states and 46973 transitions. [2023-11-12 00:51:43,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-12 00:51:43,355 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:51:43,355 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:51:43,355 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-12 00:51:43,356 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-12 00:51:43,356 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:51:43,356 INFO L85 PathProgramCache]: Analyzing trace with hash 1685430051, now seen corresponding path program 1 times [2023-11-12 00:51:43,356 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:51:43,357 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535447378] [2023-11-12 00:51:43,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:43,357 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:51:43,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:43,455 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 00:51:43,455 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:51:43,456 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535447378] [2023-11-12 00:51:43,456 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [535447378] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:51:43,456 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:51:43,456 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:51:43,456 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225266075] [2023-11-12 00:51:43,457 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:51:43,457 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:51:43,457 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:51:43,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:51:43,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:51:43,458 INFO L87 Difference]: Start difference. First operand 14953 states and 46973 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 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 00:51:44,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:51:44,356 INFO L93 Difference]: Finished difference Result 11977 states and 37247 transitions. [2023-11-12 00:51:44,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:51:44,357 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 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 00:51:44,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:51:44,427 INFO L225 Difference]: With dead ends: 11977 [2023-11-12 00:51:44,427 INFO L226 Difference]: Without dead ends: 11977 [2023-11-12 00:51:44,427 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 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 00:51:44,428 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 234 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 455 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 455 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-12 00:51:44,430 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [234 Valid, 132 Invalid, 474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 455 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-12 00:51:44,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11977 states. [2023-11-12 00:51:44,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11977 to 11809. [2023-11-12 00:51:44,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11809 states, 10655 states have (on average 3.4754575316752696) internal successors, (37031), 11808 states have internal predecessors, (37031), 0 states have call successors, (0), 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 00:51:44,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11809 states to 11809 states and 37031 transitions. [2023-11-12 00:51:44,823 INFO L78 Accepts]: Start accepts. Automaton has 11809 states and 37031 transitions. Word has length 7 [2023-11-12 00:51:44,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:51:44,823 INFO L495 AbstractCegarLoop]: Abstraction has 11809 states and 37031 transitions. [2023-11-12 00:51:44,824 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 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 00:51:44,824 INFO L276 IsEmpty]: Start isEmpty. Operand 11809 states and 37031 transitions. [2023-11-12 00:51:44,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-12 00:51:44,825 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:51:44,826 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:51:44,826 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-12 00:51:44,826 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-12 00:51:44,827 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:51:44,827 INFO L85 PathProgramCache]: Analyzing trace with hash 1685430052, now seen corresponding path program 1 times [2023-11-12 00:51:44,827 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:51:44,828 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499145423] [2023-11-12 00:51:44,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:44,828 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:51:44,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:45,040 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 00:51:45,041 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:51:45,041 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499145423] [2023-11-12 00:51:45,041 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499145423] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:51:45,041 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:51:45,041 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:51:45,041 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880881505] [2023-11-12 00:51:45,041 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:51:45,042 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:51:45,042 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:51:45,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:51:45,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:51:45,043 INFO L87 Difference]: Start difference. First operand 11809 states and 37031 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 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 00:51:45,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:51:45,521 INFO L93 Difference]: Finished difference Result 8894 states and 27723 transitions. [2023-11-12 00:51:45,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:51:45,522 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 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 00:51:45,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:51:45,550 INFO L225 Difference]: With dead ends: 8894 [2023-11-12 00:51:45,550 INFO L226 Difference]: Without dead ends: 8894 [2023-11-12 00:51:45,551 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 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 00:51:45,551 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 234 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-12 00:51:45,552 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [234 Valid, 90 Invalid, 343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-12 00:51:45,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8894 states. [2023-11-12 00:51:46,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8894 to 8894. [2023-11-12 00:51:46,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8894 states, 8330 states have (on average 3.328091236494598) internal successors, (27723), 8893 states have internal predecessors, (27723), 0 states have call successors, (0), 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 00:51:46,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8894 states to 8894 states and 27723 transitions. [2023-11-12 00:51:46,109 INFO L78 Accepts]: Start accepts. Automaton has 8894 states and 27723 transitions. Word has length 7 [2023-11-12 00:51:46,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:51:46,109 INFO L495 AbstractCegarLoop]: Abstraction has 8894 states and 27723 transitions. [2023-11-12 00:51:46,109 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 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 00:51:46,109 INFO L276 IsEmpty]: Start isEmpty. Operand 8894 states and 27723 transitions. [2023-11-12 00:51:46,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-12 00:51:46,111 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:51:46,111 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:51:46,112 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-12 00:51:46,112 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting writer_fnErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-12 00:51:46,112 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:51:46,112 INFO L85 PathProgramCache]: Analyzing trace with hash -146919095, now seen corresponding path program 1 times [2023-11-12 00:51:46,113 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:51:46,113 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1943391470] [2023-11-12 00:51:46,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:46,113 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:51:46,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:46,344 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 00:51:46,344 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:51:46,345 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1943391470] [2023-11-12 00:51:46,345 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1943391470] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:51:46,345 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:51:46,345 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-12 00:51:46,345 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937018717] [2023-11-12 00:51:46,345 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:51:46,346 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:51:46,346 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:51:46,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:51:46,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:51:46,347 INFO L87 Difference]: Start difference. First operand 8894 states and 27723 transitions. Second operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 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 00:51:47,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:51:47,394 INFO L93 Difference]: Finished difference Result 14734 states and 46062 transitions. [2023-11-12 00:51:47,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-12 00:51:47,395 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 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 00:51:47,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:51:47,467 INFO L225 Difference]: With dead ends: 14734 [2023-11-12 00:51:47,467 INFO L226 Difference]: Without dead ends: 14734 [2023-11-12 00:51:47,467 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2023-11-12 00:51:47,468 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 585 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 623 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 585 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 623 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-12 00:51:47,469 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [585 Valid, 144 Invalid, 632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 623 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-12 00:51:47,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14734 states. [2023-11-12 00:51:47,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14734 to 13548. [2023-11-12 00:51:47,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13548 states, 12984 states have (on average 3.369377695625385) internal successors, (43748), 13547 states have internal predecessors, (43748), 0 states have call successors, (0), 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 00:51:47,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13548 states to 13548 states and 43748 transitions. [2023-11-12 00:51:47,954 INFO L78 Accepts]: Start accepts. Automaton has 13548 states and 43748 transitions. Word has length 8 [2023-11-12 00:51:47,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:51:47,954 INFO L495 AbstractCegarLoop]: Abstraction has 13548 states and 43748 transitions. [2023-11-12 00:51:47,955 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 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 00:51:47,955 INFO L276 IsEmpty]: Start isEmpty. Operand 13548 states and 43748 transitions. [2023-11-12 00:51:47,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-12 00:51:47,956 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:51:47,956 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:51:47,956 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-11-12 00:51:47,956 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting writer_fnErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-12 00:51:47,957 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:51:47,957 INFO L85 PathProgramCache]: Analyzing trace with hash 706593055, now seen corresponding path program 2 times [2023-11-12 00:51:47,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:51:47,957 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1488617026] [2023-11-12 00:51:47,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:47,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:51:47,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:48,238 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 00:51:48,238 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:51:48,238 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1488617026] [2023-11-12 00:51:48,238 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1488617026] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:51:48,238 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:51:48,239 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-12 00:51:48,239 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719623612] [2023-11-12 00:51:48,239 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:51:48,239 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:51:48,240 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:51:48,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:51:48,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:51:48,241 INFO L87 Difference]: Start difference. First operand 13548 states and 43748 transitions. Second operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 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 00:51:49,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:51:49,424 INFO L93 Difference]: Finished difference Result 11272 states and 36306 transitions. [2023-11-12 00:51:49,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-12 00:51:49,425 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 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 00:51:49,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:51:49,471 INFO L225 Difference]: With dead ends: 11272 [2023-11-12 00:51:49,472 INFO L226 Difference]: Without dead ends: 11272 [2023-11-12 00:51:49,472 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2023-11-12 00:51:49,473 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 367 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 714 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 367 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 726 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 714 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-12 00:51:49,473 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [367 Valid, 138 Invalid, 726 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 714 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-12 00:51:49,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11272 states. [2023-11-12 00:51:49,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11272 to 6304. [2023-11-12 00:51:49,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6304 states, 6095 states have (on average 3.2124692370795733) internal successors, (19580), 6303 states have internal predecessors, (19580), 0 states have call successors, (0), 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 00:51:49,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6304 states to 6304 states and 19580 transitions. [2023-11-12 00:51:49,703 INFO L78 Accepts]: Start accepts. Automaton has 6304 states and 19580 transitions. Word has length 8 [2023-11-12 00:51:49,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:51:49,703 INFO L495 AbstractCegarLoop]: Abstraction has 6304 states and 19580 transitions. [2023-11-12 00:51:49,704 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 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 00:51:49,704 INFO L276 IsEmpty]: Start isEmpty. Operand 6304 states and 19580 transitions. [2023-11-12 00:51:49,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-12 00:51:49,705 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:51:49,705 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:51:49,706 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-12 00:51:49,706 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting writer_fnErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [reader_twoErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, reader_twoErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 96 more)] === [2023-11-12 00:51:49,706 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:51:49,707 INFO L85 PathProgramCache]: Analyzing trace with hash -848164188, now seen corresponding path program 1 times [2023-11-12 00:51:49,707 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:51:49,707 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [978445040] [2023-11-12 00:51:49,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:49,707 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:51:49,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:50,090 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 00:51:50,090 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:51:50,091 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [978445040] [2023-11-12 00:51:50,091 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [978445040] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:51:50,091 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:51:50,091 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-12 00:51:50,091 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235526690] [2023-11-12 00:51:50,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:51:50,092 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-12 00:51:50,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:51:50,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-12 00:51:50,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2023-11-12 00:51:50,093 INFO L87 Difference]: Start difference. First operand 6304 states and 19580 transitions. Second operand has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:52,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:51:52,065 INFO L93 Difference]: Finished difference Result 9461 states and 30052 transitions. [2023-11-12 00:51:52,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-12 00:51:52,066 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-12 00:51:52,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:51:52,087 INFO L225 Difference]: With dead ends: 9461 [2023-11-12 00:51:52,087 INFO L226 Difference]: Without dead ends: 9461 [2023-11-12 00:51:52,088 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=183, Unknown=0, NotChecked=0, Total=272 [2023-11-12 00:51:52,088 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 386 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 1903 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 386 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 1905 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 1903 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-11-12 00:51:52,089 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [386 Valid, 236 Invalid, 1905 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 1903 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-11-12 00:51:52,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9461 states.