./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/dll2c_prepend_equal.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/dll2c_prepend_equal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91 --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 e0e4fff172a515598d076941b225a1a1f31b97f5ac14127a866784b10a4e3537 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-25 00:06:55,359 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-25 00:06:55,444 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-25 00:06:55,449 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-25 00:06:55,450 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-25 00:06:55,476 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-25 00:06:55,477 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-25 00:06:55,478 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-25 00:06:55,478 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-25 00:06:55,479 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-25 00:06:55,480 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-25 00:06:55,480 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-25 00:06:55,481 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-25 00:06:55,481 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-25 00:06:55,482 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-25 00:06:55,482 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-25 00:06:55,483 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-25 00:06:55,483 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-25 00:06:55,484 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-25 00:06:55,484 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-25 00:06:55,485 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-25 00:06:55,485 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-25 00:06:55,486 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-25 00:06:55,486 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-25 00:06:55,487 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-25 00:06:55,487 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-25 00:06:55,488 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-25 00:06:55,488 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-25 00:06:55,488 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-25 00:06:55,489 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-25 00:06:55,489 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-25 00:06:55,490 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-25 00:06:55,490 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-25 00:06:55,490 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-25 00:06:55,491 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-25 00:06:55,491 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-25 00:06:55,492 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-25 00:06:55,492 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-25 00:06:55,492 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-25 00:06:55,493 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-25 00:06:55,493 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-25 00:06:55,494 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-25 00:06:55,494 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-25 00:06:55,495 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-25 00:06:55,495 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-25 00:06:55,495 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-25 00:06:55,496 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-25 00:06:55,496 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-25 00:06:55,497 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_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e0e4fff172a515598d076941b225a1a1f31b97f5ac14127a866784b10a4e3537 [2023-11-25 00:06:55,717 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-25 00:06:55,744 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-25 00:06:55,751 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-25 00:06:55,752 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-25 00:06:55,753 INFO L274 PluginConnector]: CDTParser initialized [2023-11-25 00:06:55,754 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/list-simple/dll2c_prepend_equal.i [2023-11-25 00:06:58,980 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-25 00:06:59,282 INFO L384 CDTParser]: Found 1 translation units. [2023-11-25 00:06:59,285 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/sv-benchmarks/c/list-simple/dll2c_prepend_equal.i [2023-11-25 00:06:59,299 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/data/939cb7528/585ea25809f14ce28f13f16592e94a87/FLAGf5484ad8a [2023-11-25 00:06:59,319 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/data/939cb7528/585ea25809f14ce28f13f16592e94a87 [2023-11-25 00:06:59,327 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-25 00:06:59,330 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-25 00:06:59,333 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-25 00:06:59,334 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-25 00:06:59,341 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-25 00:06:59,342 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 12:06:59" (1/1) ... [2023-11-25 00:06:59,343 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d8de600 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:59, skipping insertion in model container [2023-11-25 00:06:59,344 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 12:06:59" (1/1) ... [2023-11-25 00:06:59,415 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-25 00:06:59,788 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-25 00:06:59,802 INFO L202 MainTranslator]: Completed pre-run [2023-11-25 00:06:59,858 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-25 00:06:59,893 INFO L206 MainTranslator]: Completed translation [2023-11-25 00:06:59,894 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:59 WrapperNode [2023-11-25 00:06:59,894 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-25 00:06:59,895 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-25 00:06:59,895 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-25 00:06:59,896 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-25 00:06:59,902 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:59" (1/1) ... [2023-11-25 00:06:59,917 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:59" (1/1) ... [2023-11-25 00:06:59,946 INFO L138 Inliner]: procedures = 127, calls = 48, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 146 [2023-11-25 00:06:59,947 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-25 00:06:59,948 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-25 00:06:59,948 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-25 00:06:59,948 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-25 00:06:59,966 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:59" (1/1) ... [2023-11-25 00:06:59,966 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:59" (1/1) ... [2023-11-25 00:06:59,977 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:59" (1/1) ... [2023-11-25 00:06:59,979 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:59" (1/1) ... [2023-11-25 00:06:59,989 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:59" (1/1) ... [2023-11-25 00:06:59,993 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:59" (1/1) ... [2023-11-25 00:06:59,995 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:59" (1/1) ... [2023-11-25 00:06:59,997 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:59" (1/1) ... [2023-11-25 00:07:00,001 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-25 00:07:00,003 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-25 00:07:00,003 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-25 00:07:00,003 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-25 00:07:00,004 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:59" (1/1) ... [2023-11-25 00:07:00,019 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-25 00:07:00,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:07:00,055 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-25 00:07:00,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-25 00:07:00,105 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-25 00:07:00,105 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-25 00:07:00,106 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-25 00:07:00,106 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-25 00:07:00,106 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-25 00:07:00,106 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-25 00:07:00,108 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-25 00:07:00,109 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-25 00:07:00,109 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-25 00:07:00,110 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-25 00:07:00,110 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-25 00:07:00,110 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-25 00:07:00,110 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-25 00:07:00,110 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-25 00:07:00,302 INFO L241 CfgBuilder]: Building ICFG [2023-11-25 00:07:00,304 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-25 00:07:00,833 INFO L282 CfgBuilder]: Performing block encoding [2023-11-25 00:07:00,906 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-25 00:07:00,906 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-25 00:07:00,908 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 12:07:00 BoogieIcfgContainer [2023-11-25 00:07:00,908 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-25 00:07:00,910 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-25 00:07:00,910 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-25 00:07:00,913 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-25 00:07:00,914 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 12:06:59" (1/3) ... [2023-11-25 00:07:00,915 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62c1acea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 12:07:00, skipping insertion in model container [2023-11-25 00:07:00,915 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:06:59" (2/3) ... [2023-11-25 00:07:00,915 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62c1acea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 12:07:00, skipping insertion in model container [2023-11-25 00:07:00,915 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 12:07:00" (3/3) ... [2023-11-25 00:07:00,916 INFO L112 eAbstractionObserver]: Analyzing ICFG dll2c_prepend_equal.i [2023-11-25 00:07:00,935 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-25 00:07:00,935 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 60 error locations. [2023-11-25 00:07:00,982 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-25 00:07:00,987 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;@4fc74e8e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-25 00:07:00,987 INFO L358 AbstractCegarLoop]: Starting to check reachability of 60 error locations. [2023-11-25 00:07:00,990 INFO L276 IsEmpty]: Start isEmpty. Operand has 120 states, 55 states have (on average 2.290909090909091) internal successors, (126), 115 states have internal predecessors, (126), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-25 00:07:00,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-25 00:07:00,996 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:07:00,997 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-25 00:07:00,997 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-25 00:07:01,002 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:07:01,002 INFO L85 PathProgramCache]: Analyzing trace with hash 234339174, now seen corresponding path program 1 times [2023-11-25 00:07:01,009 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:07:01,009 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1798517516] [2023-11-25 00:07:01,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:07:01,010 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:07:01,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:07:01,240 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:07:01,241 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:07:01,241 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1798517516] [2023-11-25 00:07:01,242 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1798517516] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:07:01,242 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:07:01,243 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-25 00:07:01,244 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70017650] [2023-11-25 00:07:01,245 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:07:01,249 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:07:01,249 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:07:01,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:07:01,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:07:01,281 INFO L87 Difference]: Start difference. First operand has 120 states, 55 states have (on average 2.290909090909091) internal successors, (126), 115 states have internal predecessors, (126), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:07:01,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:07:01,460 INFO L93 Difference]: Finished difference Result 116 states and 125 transitions. [2023-11-25 00:07:01,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:07:01,463 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-25 00:07:01,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:07:01,473 INFO L225 Difference]: With dead ends: 116 [2023-11-25 00:07:01,474 INFO L226 Difference]: Without dead ends: 114 [2023-11-25 00:07:01,476 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 [2023-11-25 00:07:01,482 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 8 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-25 00:07:01,484 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 160 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-25 00:07:01,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2023-11-25 00:07:01,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2023-11-25 00:07:01,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 53 states have (on average 2.188679245283019) internal successors, (116), 109 states have internal predecessors, (116), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-25 00:07:01,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 122 transitions. [2023-11-25 00:07:01,561 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 122 transitions. Word has length 5 [2023-11-25 00:07:01,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:07:01,561 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 122 transitions. [2023-11-25 00:07:01,561 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:07:01,561 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 122 transitions. [2023-11-25 00:07:01,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-25 00:07:01,562 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:07:01,562 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-25 00:07:01,562 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-25 00:07:01,562 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-25 00:07:01,563 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:07:01,563 INFO L85 PathProgramCache]: Analyzing trace with hash 234339175, now seen corresponding path program 1 times [2023-11-25 00:07:01,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:07:01,563 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2074770899] [2023-11-25 00:07:01,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:07:01,564 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:07:01,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:07:01,685 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:07:01,685 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:07:01,685 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2074770899] [2023-11-25 00:07:01,686 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2074770899] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:07:01,686 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:07:01,686 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-25 00:07:01,686 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157944433] [2023-11-25 00:07:01,687 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:07:01,688 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:07:01,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:07:01,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:07:01,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:07:01,689 INFO L87 Difference]: Start difference. First operand 114 states and 122 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:07:01,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:07:01,828 INFO L93 Difference]: Finished difference Result 111 states and 119 transitions. [2023-11-25 00:07:01,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:07:01,829 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-25 00:07:01,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:07:01,856 INFO L225 Difference]: With dead ends: 111 [2023-11-25 00:07:01,856 INFO L226 Difference]: Without dead ends: 111 [2023-11-25 00:07:01,857 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 [2023-11-25 00:07:01,860 INFO L413 NwaCegarLoop]: 103 mSDtfsCounter, 3 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-25 00:07:01,862 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 165 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-25 00:07:01,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2023-11-25 00:07:01,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2023-11-25 00:07:01,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 53 states have (on average 2.1320754716981134) internal successors, (113), 106 states have internal predecessors, (113), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-25 00:07:01,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 119 transitions. [2023-11-25 00:07:01,880 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 119 transitions. Word has length 5 [2023-11-25 00:07:01,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:07:01,881 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 119 transitions. [2023-11-25 00:07:01,882 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:07:01,884 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 119 transitions. [2023-11-25 00:07:01,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-25 00:07:01,885 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:07:01,886 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:07:01,886 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-25 00:07:01,886 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-25 00:07:01,887 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:07:01,888 INFO L85 PathProgramCache]: Analyzing trace with hash -596227078, now seen corresponding path program 1 times [2023-11-25 00:07:01,888 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:07:01,888 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1019263326] [2023-11-25 00:07:01,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:07:01,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:07:01,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:07:02,158 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:07:02,159 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:07:02,159 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1019263326] [2023-11-25 00:07:02,159 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1019263326] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:07:02,160 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:07:02,160 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-25 00:07:02,161 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182830804] [2023-11-25 00:07:02,161 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:07:02,162 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-25 00:07:02,162 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:07:02,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-25 00:07:02,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-25 00:07:02,170 INFO L87 Difference]: Start difference. First operand 111 states and 119 transitions. Second operand has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-25 00:07:02,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:07:02,451 INFO L93 Difference]: Finished difference Result 115 states and 125 transitions. [2023-11-25 00:07:02,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-25 00:07:02,453 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2023-11-25 00:07:02,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:07:02,459 INFO L225 Difference]: With dead ends: 115 [2023-11-25 00:07:02,460 INFO L226 Difference]: Without dead ends: 115 [2023-11-25 00:07:02,466 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-25 00:07:02,472 INFO L413 NwaCegarLoop]: 99 mSDtfsCounter, 7 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-25 00:07:02,475 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 310 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 274 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-25 00:07:02,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2023-11-25 00:07:02,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 113. [2023-11-25 00:07:02,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 55 states have (on average 2.1272727272727274) internal successors, (117), 108 states have internal predecessors, (117), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-25 00:07:02,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 123 transitions. [2023-11-25 00:07:02,497 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 123 transitions. Word has length 11 [2023-11-25 00:07:02,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:07:02,498 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 123 transitions. [2023-11-25 00:07:02,498 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-25 00:07:02,499 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 123 transitions. [2023-11-25 00:07:02,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-25 00:07:02,499 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:07:02,499 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:07:02,500 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-25 00:07:02,500 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-25 00:07:02,501 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:07:02,501 INFO L85 PathProgramCache]: Analyzing trace with hash -596227077, now seen corresponding path program 1 times [2023-11-25 00:07:02,502 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:07:02,502 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [299064025] [2023-11-25 00:07:02,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:07:02,502 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:07:02,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:07:02,611 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:07:02,611 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:07:02,612 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [299064025] [2023-11-25 00:07:02,612 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [299064025] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:07:02,612 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:07:02,612 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-25 00:07:02,612 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945497214] [2023-11-25 00:07:02,613 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:07:02,613 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:07:02,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:07:02,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:07:02,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:07:02,615 INFO L87 Difference]: Start difference. First operand 113 states and 123 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-25 00:07:02,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:07:02,651 INFO L93 Difference]: Finished difference Result 112 states and 120 transitions. [2023-11-25 00:07:02,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:07:02,652 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2023-11-25 00:07:02,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:07:02,653 INFO L225 Difference]: With dead ends: 112 [2023-11-25 00:07:02,653 INFO L226 Difference]: Without dead ends: 112 [2023-11-25 00:07:02,654 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:07:02,655 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 10 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-25 00:07:02,656 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 196 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-25 00:07:02,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2023-11-25 00:07:02,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2023-11-25 00:07:02,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 54 states have (on average 2.111111111111111) internal successors, (114), 107 states have internal predecessors, (114), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-25 00:07:02,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 120 transitions. [2023-11-25 00:07:02,666 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 120 transitions. Word has length 11 [2023-11-25 00:07:02,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:07:02,666 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 120 transitions. [2023-11-25 00:07:02,666 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-25 00:07:02,667 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 120 transitions. [2023-11-25 00:07:02,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-25 00:07:02,667 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:07:02,668 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:07:02,668 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-25 00:07:02,668 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-25 00:07:02,669 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:07:02,669 INFO L85 PathProgramCache]: Analyzing trace with hash -1003078540, now seen corresponding path program 1 times [2023-11-25 00:07:02,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:07:02,669 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757099383] [2023-11-25 00:07:02,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:07:02,670 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:07:02,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:07:02,862 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-25 00:07:02,862 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:07:02,862 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757099383] [2023-11-25 00:07:02,863 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1757099383] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:07:02,863 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:07:02,863 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-25 00:07:02,863 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444581678] [2023-11-25 00:07:02,863 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:07:02,864 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-25 00:07:02,864 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:07:02,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-25 00:07:02,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-25 00:07:02,865 INFO L87 Difference]: Start difference. First operand 112 states and 120 transitions. Second operand has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:07:03,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:07:03,147 INFO L93 Difference]: Finished difference Result 111 states and 119 transitions. [2023-11-25 00:07:03,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-25 00:07:03,148 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2023-11-25 00:07:03,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:07:03,149 INFO L225 Difference]: With dead ends: 111 [2023-11-25 00:07:03,150 INFO L226 Difference]: Without dead ends: 111 [2023-11-25 00:07:03,150 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-25 00:07:03,151 INFO L413 NwaCegarLoop]: 96 mSDtfsCounter, 9 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 270 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 305 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 270 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-25 00:07:03,151 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 305 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 270 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-25 00:07:03,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2023-11-25 00:07:03,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2023-11-25 00:07:03,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 54 states have (on average 2.0925925925925926) internal successors, (113), 106 states have internal predecessors, (113), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-25 00:07:03,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 119 transitions. [2023-11-25 00:07:03,160 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 119 transitions. Word has length 19 [2023-11-25 00:07:03,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:07:03,161 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 119 transitions. [2023-11-25 00:07:03,161 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:07:03,161 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 119 transitions. [2023-11-25 00:07:03,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-25 00:07:03,162 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:07:03,162 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:07:03,162 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-25 00:07:03,163 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-25 00:07:03,163 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:07:03,163 INFO L85 PathProgramCache]: Analyzing trace with hash -1003078539, now seen corresponding path program 1 times [2023-11-25 00:07:03,163 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:07:03,164 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2102995840] [2023-11-25 00:07:03,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:07:03,164 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:07:03,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:07:03,392 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-25 00:07:03,392 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:07:03,392 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2102995840] [2023-11-25 00:07:03,393 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2102995840] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:07:03,393 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:07:03,393 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-25 00:07:03,393 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179446805] [2023-11-25 00:07:03,393 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:07:03,394 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-25 00:07:03,394 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:07:03,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-25 00:07:03,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-25 00:07:03,395 INFO L87 Difference]: Start difference. First operand 111 states and 119 transitions. Second operand has 6 states, 4 states have (on average 3.75) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:07:03,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:07:03,641 INFO L93 Difference]: Finished difference Result 110 states and 118 transitions. [2023-11-25 00:07:03,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-25 00:07:03,644 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 3.75) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2023-11-25 00:07:03,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:07:03,645 INFO L225 Difference]: With dead ends: 110 [2023-11-25 00:07:03,646 INFO L226 Difference]: Without dead ends: 110 [2023-11-25 00:07:03,646 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-25 00:07:03,647 INFO L413 NwaCegarLoop]: 96 mSDtfsCounter, 7 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 365 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-25 00:07:03,647 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 365 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-25 00:07:03,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2023-11-25 00:07:03,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2023-11-25 00:07:03,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 54 states have (on average 2.074074074074074) internal successors, (112), 105 states have internal predecessors, (112), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-25 00:07:03,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 118 transitions. [2023-11-25 00:07:03,654 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 118 transitions. Word has length 19 [2023-11-25 00:07:03,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:07:03,654 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 118 transitions. [2023-11-25 00:07:03,654 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 3.75) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:07:03,654 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 118 transitions. [2023-11-25 00:07:03,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-25 00:07:03,655 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:07:03,655 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:07:03,655 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-25 00:07:03,656 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-25 00:07:03,656 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:07:03,656 INFO L85 PathProgramCache]: Analyzing trace with hash -1885802923, now seen corresponding path program 1 times [2023-11-25 00:07:03,656 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:07:03,657 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1351711091] [2023-11-25 00:07:03,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:07:03,657 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:07:03,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:07:04,047 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:07:04,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:07:04,047 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1351711091] [2023-11-25 00:07:04,047 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1351711091] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:07:04,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [228646357] [2023-11-25 00:07:04,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:07:04,048 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:07:04,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:07:04,054 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:07:04,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-25 00:07:04,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:07:04,219 INFO L262 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 21 conjunts are in the unsatisfiable core [2023-11-25 00:07:04,227 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:07:04,289 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-25 00:07:04,372 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-25 00:07:04,372 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 13 [2023-11-25 00:07:04,433 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:07:04,434 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:07:04,953 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:07:04,954 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [228646357] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:07:04,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [797270604] [2023-11-25 00:07:04,982 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-25 00:07:04,982 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:07:04,989 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:07:05,000 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:07:05,001 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:07:06,705 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 155 for LOIs [2023-11-25 00:07:07,609 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:07:26,185 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1640#(and (= (select |#valid| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 1) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_dll_circular_create_#in~data#1| 1) (= |ULTIMATE.start_dll_circular_create_~head~0#1.offset| 0) (exists ((|v_#memory_$Pointer$.base_100| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_100| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.base_100| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0 |ULTIMATE.start_dll_circular_create_~head~0#1.base|)) |#memory_$Pointer$.base|)) (= |ULTIMATE.start_dll_circular_create_#in~len#1| 2) (exists ((|v_#memory_$Pointer$.offset_100| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_100| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.offset_100| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0 0)))) (= 2 |ULTIMATE.start_dll_circular_create_~len#1|) (= |ULTIMATE.start_main_~data~0#1| 1) (<= 4 (select |#length| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|)) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_circular_create_~last~0#1.offset| 0) (not (= |ULTIMATE.start_dll_circular_create_~head~0#1.base| 0)) (exists ((|v_#memory_int_79| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_79| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base| (store (select |v_#memory_int_79| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0 (select (select |#memory_int| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0))))) (= |ULTIMATE.start_dll_circular_create_~new_head~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (not (= (select |#valid| |ULTIMATE.start_dll_circular_create_~head~0#1.base|) 1)) (= |ULTIMATE.start_dll_circular_create_~data#1| 1))' at error location [2023-11-25 00:07:26,186 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:07:26,186 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:07:26,186 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 17 [2023-11-25 00:07:26,186 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88356016] [2023-11-25 00:07:26,186 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:07:26,187 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-25 00:07:26,187 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:07:26,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-25 00:07:26,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=793, Unknown=4, NotChecked=0, Total=930 [2023-11-25 00:07:26,189 INFO L87 Difference]: Start difference. First operand 110 states and 118 transitions. Second operand has 18 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-25 00:07:26,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:07:26,776 INFO L93 Difference]: Finished difference Result 117 states and 127 transitions. [2023-11-25 00:07:26,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-25 00:07:26,777 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 21 [2023-11-25 00:07:26,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:07:26,778 INFO L225 Difference]: With dead ends: 117 [2023-11-25 00:07:26,778 INFO L226 Difference]: Without dead ends: 117 [2023-11-25 00:07:26,779 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 18.9s TimeCoverageRelationStatistics Valid=145, Invalid=843, Unknown=4, NotChecked=0, Total=992 [2023-11-25 00:07:26,780 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 13 mSDsluCounter, 435 mSDsCounter, 0 mSdLazyCounter, 613 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 528 SdHoareTripleChecker+Invalid, 637 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 613 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-25 00:07:26,780 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 528 Invalid, 637 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 613 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-25 00:07:26,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2023-11-25 00:07:26,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 115. [2023-11-25 00:07:26,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 58 states have (on average 2.0344827586206895) internal successors, (118), 109 states have internal predecessors, (118), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-25 00:07:26,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 126 transitions. [2023-11-25 00:07:26,787 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 126 transitions. Word has length 21 [2023-11-25 00:07:26,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:07:26,787 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 126 transitions. [2023-11-25 00:07:26,788 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-25 00:07:26,788 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 126 transitions. [2023-11-25 00:07:26,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-25 00:07:26,789 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:07:26,789 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:07:26,798 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-25 00:07:26,995 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:07:26,998 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-25 00:07:26,998 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:07:26,998 INFO L85 PathProgramCache]: Analyzing trace with hash -1885802922, now seen corresponding path program 1 times [2023-11-25 00:07:26,998 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:07:26,998 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [911466488] [2023-11-25 00:07:26,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:07:26,999 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:07:27,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:07:27,485 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:07:27,485 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:07:27,485 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [911466488] [2023-11-25 00:07:27,485 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [911466488] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:07:27,485 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2060758047] [2023-11-25 00:07:27,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:07:27,486 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:07:27,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:07:27,490 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:07:27,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-25 00:07:27,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:07:27,634 INFO L262 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-25 00:07:27,645 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:07:27,653 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-25 00:07:27,660 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-25 00:07:27,729 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (= (store |c_old(#length)| |node_create_~temp~0#1.base| (select |c_#length| |node_create_~temp~0#1.base|)) |c_#length|) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-25 00:07:27,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:07:27,771 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-25 00:07:27,781 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-25 00:07:27,781 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-25 00:07:27,820 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 5 not checked. [2023-11-25 00:07:27,821 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:07:27,963 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2060758047] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:07:27,963 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [890699112] [2023-11-25 00:07:27,966 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-25 00:07:27,966 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:07:27,967 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:07:27,967 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:07:27,967 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:07:28,858 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 155 for LOIs [2023-11-25 00:07:29,552 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:07:47,118 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1976#(and (= (select |#valid| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 1) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_dll_circular_create_#in~data#1| 1) (= |ULTIMATE.start_dll_circular_create_~head~0#1.offset| 0) (exists ((|v_#memory_$Pointer$.offset_114| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_114| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.offset_114| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0 0)))) (<= (select |#length| |ULTIMATE.start_dll_circular_create_~head~0#1.base|) 7) (= |ULTIMATE.start_dll_circular_create_#in~len#1| 2) (= 2 |ULTIMATE.start_dll_circular_create_~len#1|) (= |ULTIMATE.start_main_~data~0#1| 1) (<= 4 (select |#length| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|)) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_circular_create_~last~0#1.offset| 0) (exists ((|v_#memory_$Pointer$.base_114| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_114| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.base_114| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0 |ULTIMATE.start_dll_circular_create_~head~0#1.base|)))) (not (= |ULTIMATE.start_dll_circular_create_~head~0#1.base| 0)) (exists ((|v_#memory_int_93| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_93| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base| (store (select |v_#memory_int_93| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0 (select (select |#memory_int| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0))))) (= |ULTIMATE.start_dll_circular_create_~new_head~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_dll_circular_create_~data#1| 1))' at error location [2023-11-25 00:07:47,119 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:07:47,119 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-25 00:07:47,119 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 11 [2023-11-25 00:07:47,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772345807] [2023-11-25 00:07:47,119 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-25 00:07:47,119 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-25 00:07:47,120 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:07:47,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-25 00:07:47,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=560, Unknown=6, NotChecked=48, Total=702 [2023-11-25 00:07:47,121 INFO L87 Difference]: Start difference. First operand 115 states and 126 transitions. Second operand has 12 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 10 states have internal predecessors, (25), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-25 00:07:47,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:07:47,711 INFO L93 Difference]: Finished difference Result 117 states and 127 transitions. [2023-11-25 00:07:47,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-25 00:07:47,712 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 10 states have internal predecessors, (25), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 21 [2023-11-25 00:07:47,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:07:47,713 INFO L225 Difference]: With dead ends: 117 [2023-11-25 00:07:47,713 INFO L226 Difference]: Without dead ends: 117 [2023-11-25 00:07:47,714 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=107, Invalid=647, Unknown=6, NotChecked=52, Total=812 [2023-11-25 00:07:47,715 INFO L413 NwaCegarLoop]: 95 mSDtfsCounter, 5 mSDsluCounter, 313 mSDsCounter, 0 mSdLazyCounter, 517 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 408 SdHoareTripleChecker+Invalid, 643 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 122 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-25 00:07:47,715 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 408 Invalid, 643 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 517 Invalid, 0 Unknown, 122 Unchecked, 0.4s Time] [2023-11-25 00:07:47,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2023-11-25 00:07:47,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 115. [2023-11-25 00:07:47,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 58 states have (on average 2.0172413793103448) internal successors, (117), 109 states have internal predecessors, (117), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-25 00:07:47,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 125 transitions. [2023-11-25 00:07:47,721 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 125 transitions. Word has length 21 [2023-11-25 00:07:47,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:07:47,722 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 125 transitions. [2023-11-25 00:07:47,722 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 10 states have internal predecessors, (25), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-25 00:07:47,722 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 125 transitions. [2023-11-25 00:07:47,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-25 00:07:47,723 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:07:47,723 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:07:47,731 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-25 00:07:47,929 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:07:47,930 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-25 00:07:47,930 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:07:47,930 INFO L85 PathProgramCache]: Analyzing trace with hash 219750646, now seen corresponding path program 1 times [2023-11-25 00:07:47,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:07:47,930 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1931151242] [2023-11-25 00:07:47,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:07:47,931 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:07:47,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:07:48,031 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-25 00:07:48,031 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:07:48,032 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1931151242] [2023-11-25 00:07:48,032 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1931151242] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:07:48,032 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [634869389] [2023-11-25 00:07:48,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:07:48,032 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:07:48,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:07:48,034 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:07:48,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a986bed-3d88-4b2f-8b63-b5eb6d58e9c4/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-25 00:07:48,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:07:48,175 INFO L262 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-25 00:07:48,177 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:07:48,195 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-25 00:07:48,195 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:07:48,228 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-25 00:07:48,228 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [634869389] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:07:48,228 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [124763296] [2023-11-25 00:07:48,231 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-25 00:07:48,231 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:07:48,231 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:07:48,232 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:07:48,232 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:07:49,177 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-25 00:07:49,293 INFO L180 IcfgInterpreter]: Interpretation finished