./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/dll2c_remove_all.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_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/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_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/dll2c_remove_all.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/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_58e42357-57cf-4bd2-9624-e1f091c6a4f8/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 6c2ed91303515fb47ae50633bb4ba0c83e07781b13d03a95e0e32251f9fc3016 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-24 23:18:00,107 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-24 23:18:00,221 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-24 23:18:00,231 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-24 23:18:00,232 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-24 23:18:00,278 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-24 23:18:00,279 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-24 23:18:00,280 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-24 23:18:00,281 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-24 23:18:00,288 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-24 23:18:00,289 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-24 23:18:00,290 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-24 23:18:00,291 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-24 23:18:00,293 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-24 23:18:00,293 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-24 23:18:00,294 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-24 23:18:00,294 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-24 23:18:00,295 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-24 23:18:00,295 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-24 23:18:00,296 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-24 23:18:00,296 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-24 23:18:00,297 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-24 23:18:00,297 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-24 23:18:00,298 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-24 23:18:00,299 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-24 23:18:00,299 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-24 23:18:00,300 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-24 23:18:00,300 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-24 23:18:00,301 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-24 23:18:00,301 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-24 23:18:00,302 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-24 23:18:00,303 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-24 23:18:00,304 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-24 23:18:00,304 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-24 23:18:00,304 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-24 23:18:00,304 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-24 23:18:00,305 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-24 23:18:00,305 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-24 23:18:00,305 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-24 23:18:00,305 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-24 23:18:00,306 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:18:00,306 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-24 23:18:00,306 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-24 23:18:00,307 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-24 23:18:00,307 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-24 23:18:00,308 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-24 23:18:00,308 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-24 23:18:00,308 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-24 23:18:00,308 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_58e42357-57cf-4bd2-9624-e1f091c6a4f8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6c2ed91303515fb47ae50633bb4ba0c83e07781b13d03a95e0e32251f9fc3016 [2023-11-24 23:18:00,619 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-24 23:18:00,653 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-24 23:18:00,657 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-24 23:18:00,658 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-24 23:18:00,659 INFO L274 PluginConnector]: CDTParser initialized [2023-11-24 23:18:00,661 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/list-simple/dll2c_remove_all.i [2023-11-24 23:18:03,832 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-24 23:18:04,145 INFO L384 CDTParser]: Found 1 translation units. [2023-11-24 23:18:04,146 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/sv-benchmarks/c/list-simple/dll2c_remove_all.i [2023-11-24 23:18:04,173 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/data/ce82c3fce/f6629e54ce704daa9fe339dd4efd7419/FLAG067adb3f8 [2023-11-24 23:18:04,192 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/data/ce82c3fce/f6629e54ce704daa9fe339dd4efd7419 [2023-11-24 23:18:04,200 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-24 23:18:04,208 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-24 23:18:04,209 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-24 23:18:04,210 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-24 23:18:04,218 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-24 23:18:04,219 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:18:04" (1/1) ... [2023-11-24 23:18:04,220 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@28c3e36f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:04, skipping insertion in model container [2023-11-24 23:18:04,220 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:18:04" (1/1) ... [2023-11-24 23:18:04,291 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-24 23:18:04,614 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:18:04,628 INFO L202 MainTranslator]: Completed pre-run [2023-11-24 23:18:04,710 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:18:04,749 INFO L206 MainTranslator]: Completed translation [2023-11-24 23:18:04,749 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:04 WrapperNode [2023-11-24 23:18:04,750 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-24 23:18:04,751 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-24 23:18:04,751 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-24 23:18:04,751 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-24 23:18:04,759 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:04" (1/1) ... [2023-11-24 23:18:04,789 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:04" (1/1) ... [2023-11-24 23:18:04,819 INFO L138 Inliner]: procedures = 126, calls = 39, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 115 [2023-11-24 23:18:04,819 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-24 23:18:04,824 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-24 23:18:04,824 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-24 23:18:04,825 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-24 23:18:04,834 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:04" (1/1) ... [2023-11-24 23:18:04,835 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:04" (1/1) ... [2023-11-24 23:18:04,839 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:04" (1/1) ... [2023-11-24 23:18:04,839 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:04" (1/1) ... [2023-11-24 23:18:04,849 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:04" (1/1) ... [2023-11-24 23:18:04,853 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:04" (1/1) ... [2023-11-24 23:18:04,856 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:04" (1/1) ... [2023-11-24 23:18:04,858 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:04" (1/1) ... [2023-11-24 23:18:04,861 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-24 23:18:04,862 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-24 23:18:04,862 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-24 23:18:04,862 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-24 23:18:04,863 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:04" (1/1) ... [2023-11-24 23:18:04,874 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:18:04,888 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:18:04,900 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-24 23:18:04,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-24 23:18:04,938 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-24 23:18:04,938 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-24 23:18:04,938 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-24 23:18:04,939 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-24 23:18:04,939 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-24 23:18:04,939 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-24 23:18:04,939 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-24 23:18:04,939 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-24 23:18:04,939 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-24 23:18:04,939 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-24 23:18:04,940 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-24 23:18:04,940 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-24 23:18:04,940 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-24 23:18:05,066 INFO L241 CfgBuilder]: Building ICFG [2023-11-24 23:18:05,068 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-24 23:18:05,563 INFO L282 CfgBuilder]: Performing block encoding [2023-11-24 23:18:05,606 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-24 23:18:05,606 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-24 23:18:05,608 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:18:05 BoogieIcfgContainer [2023-11-24 23:18:05,608 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-24 23:18:05,610 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-24 23:18:05,610 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-24 23:18:05,614 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-24 23:18:05,614 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 11:18:04" (1/3) ... [2023-11-24 23:18:05,615 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@63daa672 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:18:05, skipping insertion in model container [2023-11-24 23:18:05,615 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:18:04" (2/3) ... [2023-11-24 23:18:05,616 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@63daa672 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:18:05, skipping insertion in model container [2023-11-24 23:18:05,616 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:18:05" (3/3) ... [2023-11-24 23:18:05,617 INFO L112 eAbstractionObserver]: Analyzing ICFG dll2c_remove_all.i [2023-11-24 23:18:05,638 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-24 23:18:05,639 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 46 error locations. [2023-11-24 23:18:05,690 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-24 23:18:05,697 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;@2924f3eb, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-24 23:18:05,697 INFO L358 AbstractCegarLoop]: Starting to check reachability of 46 error locations. [2023-11-24 23:18:05,702 INFO L276 IsEmpty]: Start isEmpty. Operand has 92 states, 42 states have (on average 2.261904761904762) internal successors, (95), 88 states have internal predecessors, (95), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:18:05,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-24 23:18:05,709 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:05,710 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-24 23:18:05,710 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 43 more)] === [2023-11-24 23:18:05,716 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:05,716 INFO L85 PathProgramCache]: Analyzing trace with hash 180097709, now seen corresponding path program 1 times [2023-11-24 23:18:05,727 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:05,727 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1496653968] [2023-11-24 23:18:05,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:05,728 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:05,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:06,050 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:18:06,051 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:06,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1496653968] [2023-11-24 23:18:06,052 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1496653968] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:18:06,053 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:18:06,053 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-24 23:18:06,055 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735949533] [2023-11-24 23:18:06,055 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:18:06,061 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:18:06,061 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:18:06,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:18:06,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:18:06,102 INFO L87 Difference]: Start difference. First operand has 92 states, 42 states have (on average 2.261904761904762) internal successors, (95), 88 states have internal predecessors, (95), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) 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) [2023-11-24 23:18:06,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:18:06,229 INFO L93 Difference]: Finished difference Result 88 states and 93 transitions. [2023-11-24 23:18:06,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:18:06,232 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 [2023-11-24 23:18:06,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:18:06,240 INFO L225 Difference]: With dead ends: 88 [2023-11-24 23:18:06,241 INFO L226 Difference]: Without dead ends: 86 [2023-11-24 23:18:06,242 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 [2023-11-24 23:18:06,246 INFO L413 NwaCegarLoop]: 76 mSDtfsCounter, 8 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:18:06,247 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 114 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:18:06,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2023-11-24 23:18:06,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2023-11-24 23:18:06,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 40 states have (on average 2.15) internal successors, (86), 82 states have internal predecessors, (86), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:18:06,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 90 transitions. [2023-11-24 23:18:06,287 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 90 transitions. Word has length 5 [2023-11-24 23:18:06,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:18:06,288 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 90 transitions. [2023-11-24 23:18:06,288 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) [2023-11-24 23:18:06,288 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 90 transitions. [2023-11-24 23:18:06,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-24 23:18:06,289 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:06,289 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-24 23:18:06,289 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-24 23:18:06,290 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 43 more)] === [2023-11-24 23:18:06,291 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:06,291 INFO L85 PathProgramCache]: Analyzing trace with hash 180097710, now seen corresponding path program 1 times [2023-11-24 23:18:06,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:06,291 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11597354] [2023-11-24 23:18:06,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:06,292 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:06,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:06,434 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:18:06,434 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:06,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11597354] [2023-11-24 23:18:06,435 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [11597354] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:18:06,436 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:18:06,436 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-24 23:18:06,436 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628032599] [2023-11-24 23:18:06,436 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:18:06,438 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:18:06,439 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:18:06,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:18:06,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:18:06,441 INFO L87 Difference]: Start difference. First operand 86 states and 90 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) [2023-11-24 23:18:06,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:18:06,585 INFO L93 Difference]: Finished difference Result 83 states and 87 transitions. [2023-11-24 23:18:06,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:18:06,586 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 [2023-11-24 23:18:06,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:18:06,588 INFO L225 Difference]: With dead ends: 83 [2023-11-24 23:18:06,588 INFO L226 Difference]: Without dead ends: 83 [2023-11-24 23:18:06,594 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 [2023-11-24 23:18:06,597 INFO L413 NwaCegarLoop]: 75 mSDtfsCounter, 3 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:18:06,597 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 119 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:18:06,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2023-11-24 23:18:06,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2023-11-24 23:18:06,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 40 states have (on average 2.075) internal successors, (83), 79 states have internal predecessors, (83), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:18:06,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 87 transitions. [2023-11-24 23:18:06,618 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 87 transitions. Word has length 5 [2023-11-24 23:18:06,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:18:06,619 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 87 transitions. [2023-11-24 23:18:06,619 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) [2023-11-24 23:18:06,619 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 87 transitions. [2023-11-24 23:18:06,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-24 23:18:06,620 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:06,620 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:18:06,621 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-24 23:18:06,621 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 43 more)] === [2023-11-24 23:18:06,622 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:06,622 INFO L85 PathProgramCache]: Analyzing trace with hash -1003301847, now seen corresponding path program 1 times [2023-11-24 23:18:06,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:06,623 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1270261565] [2023-11-24 23:18:06,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:06,624 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:06,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:06,809 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:18:06,810 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:06,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1270261565] [2023-11-24 23:18:06,810 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1270261565] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:18:06,810 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:18:06,811 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-24 23:18:06,811 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906132196] [2023-11-24 23:18:06,811 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:18:06,812 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-24 23:18:06,812 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:18:06,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-24 23:18:06,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:18:06,814 INFO L87 Difference]: Start difference. First operand 83 states and 87 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) [2023-11-24 23:18:07,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:18:07,052 INFO L93 Difference]: Finished difference Result 87 states and 93 transitions. [2023-11-24 23:18:07,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:18:07,053 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 [2023-11-24 23:18:07,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:18:07,056 INFO L225 Difference]: With dead ends: 87 [2023-11-24 23:18:07,056 INFO L226 Difference]: Without dead ends: 87 [2023-11-24 23:18:07,056 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 [2023-11-24 23:18:07,058 INFO L413 NwaCegarLoop]: 71 mSDtfsCounter, 7 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 210 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:18:07,058 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 210 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:18:07,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2023-11-24 23:18:07,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 85. [2023-11-24 23:18:07,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 42 states have (on average 2.0714285714285716) internal successors, (87), 81 states have internal predecessors, (87), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:18:07,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 91 transitions. [2023-11-24 23:18:07,069 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 91 transitions. Word has length 11 [2023-11-24 23:18:07,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:18:07,070 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 91 transitions. [2023-11-24 23:18:07,070 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) [2023-11-24 23:18:07,070 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 91 transitions. [2023-11-24 23:18:07,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-24 23:18:07,071 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:07,071 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:18:07,071 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-24 23:18:07,071 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 43 more)] === [2023-11-24 23:18:07,072 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:07,072 INFO L85 PathProgramCache]: Analyzing trace with hash -1003301846, now seen corresponding path program 1 times [2023-11-24 23:18:07,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:07,073 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [692866397] [2023-11-24 23:18:07,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:07,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:07,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:07,151 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:18:07,152 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:07,152 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [692866397] [2023-11-24 23:18:07,152 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [692866397] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:18:07,152 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:18:07,153 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-24 23:18:07,153 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30574504] [2023-11-24 23:18:07,153 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:18:07,154 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:18:07,154 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:18:07,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:18:07,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:18:07,155 INFO L87 Difference]: Start difference. First operand 85 states and 91 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) [2023-11-24 23:18:07,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:18:07,183 INFO L93 Difference]: Finished difference Result 84 states and 88 transitions. [2023-11-24 23:18:07,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:18:07,184 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 [2023-11-24 23:18:07,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:18:07,186 INFO L225 Difference]: With dead ends: 84 [2023-11-24 23:18:07,186 INFO L226 Difference]: Without dead ends: 84 [2023-11-24 23:18:07,186 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 [2023-11-24 23:18:07,188 INFO L413 NwaCegarLoop]: 76 mSDtfsCounter, 10 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:18:07,189 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 140 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:18:07,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2023-11-24 23:18:07,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2023-11-24 23:18:07,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 41 states have (on average 2.048780487804878) internal successors, (84), 80 states have internal predecessors, (84), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:18:07,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 88 transitions. [2023-11-24 23:18:07,197 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 88 transitions. Word has length 11 [2023-11-24 23:18:07,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:18:07,198 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 88 transitions. [2023-11-24 23:18:07,198 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) [2023-11-24 23:18:07,198 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 88 transitions. [2023-11-24 23:18:07,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-24 23:18:07,199 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:07,199 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:18:07,200 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-24 23:18:07,200 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 43 more)] === [2023-11-24 23:18:07,200 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:07,201 INFO L85 PathProgramCache]: Analyzing trace with hash -905761605, now seen corresponding path program 1 times [2023-11-24 23:18:07,201 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:07,201 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1455013659] [2023-11-24 23:18:07,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:07,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:07,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:07,349 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-24 23:18:07,349 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:07,350 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1455013659] [2023-11-24 23:18:07,350 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1455013659] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:18:07,350 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:18:07,350 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-24 23:18:07,351 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962071772] [2023-11-24 23:18:07,351 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:18:07,351 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-24 23:18:07,351 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:18:07,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-24 23:18:07,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:18:07,353 INFO L87 Difference]: Start difference. First operand 84 states and 88 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) [2023-11-24 23:18:07,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:18:07,532 INFO L93 Difference]: Finished difference Result 83 states and 87 transitions. [2023-11-24 23:18:07,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:18:07,533 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 [2023-11-24 23:18:07,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:18:07,534 INFO L225 Difference]: With dead ends: 83 [2023-11-24 23:18:07,534 INFO L226 Difference]: Without dead ends: 83 [2023-11-24 23:18:07,535 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 [2023-11-24 23:18:07,536 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 9 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:18:07,536 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 205 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:18:07,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2023-11-24 23:18:07,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2023-11-24 23:18:07,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 41 states have (on average 2.024390243902439) internal successors, (83), 79 states have internal predecessors, (83), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:18:07,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 87 transitions. [2023-11-24 23:18:07,544 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 87 transitions. Word has length 19 [2023-11-24 23:18:07,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:18:07,544 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 87 transitions. [2023-11-24 23:18:07,545 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) [2023-11-24 23:18:07,545 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 87 transitions. [2023-11-24 23:18:07,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-24 23:18:07,546 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:07,546 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:18:07,546 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-24 23:18:07,546 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 43 more)] === [2023-11-24 23:18:07,547 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:07,547 INFO L85 PathProgramCache]: Analyzing trace with hash -905761604, now seen corresponding path program 1 times [2023-11-24 23:18:07,547 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:07,547 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1932828661] [2023-11-24 23:18:07,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:07,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:07,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:07,861 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:18:07,861 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:07,861 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1932828661] [2023-11-24 23:18:07,862 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1932828661] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:18:07,862 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:18:07,862 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-24 23:18:07,862 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054946958] [2023-11-24 23:18:07,863 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:18:07,866 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-24 23:18:07,867 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:18:07,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-24 23:18:07,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:18:07,868 INFO L87 Difference]: Start difference. First operand 83 states and 87 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) [2023-11-24 23:18:08,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:18:08,051 INFO L93 Difference]: Finished difference Result 82 states and 86 transitions. [2023-11-24 23:18:08,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:18:08,051 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 [2023-11-24 23:18:08,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:18:08,052 INFO L225 Difference]: With dead ends: 82 [2023-11-24 23:18:08,052 INFO L226 Difference]: Without dead ends: 82 [2023-11-24 23:18:08,053 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 [2023-11-24 23:18:08,054 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 7 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 182 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 229 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:18:08,054 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 229 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 182 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:18:08,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2023-11-24 23:18:08,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2023-11-24 23:18:08,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 41 states have (on average 2.0) internal successors, (82), 78 states have internal predecessors, (82), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:18:08,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 86 transitions. [2023-11-24 23:18:08,060 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 86 transitions. Word has length 19 [2023-11-24 23:18:08,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:18:08,060 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 86 transitions. [2023-11-24 23:18:08,061 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) [2023-11-24 23:18:08,061 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 86 transitions. [2023-11-24 23:18:08,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-24 23:18:08,061 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:08,062 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:18:08,062 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-24 23:18:08,062 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 43 more)] === [2023-11-24 23:18:08,063 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:08,063 INFO L85 PathProgramCache]: Analyzing trace with hash 1441458396, now seen corresponding path program 1 times [2023-11-24 23:18:08,063 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:08,063 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349417125] [2023-11-24 23:18:08,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:08,064 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:08,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:08,392 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:18:08,392 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:08,393 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349417125] [2023-11-24 23:18:08,393 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1349417125] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:18:08,393 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [310219756] [2023-11-24 23:18:08,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:08,394 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:18:08,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:18:08,404 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:18:08,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-24 23:18:08,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:08,602 INFO L262 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-24 23:18:08,612 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:18:08,676 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 [2023-11-24 23:18:08,741 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| (select |c_#valid| |node_create_~temp~0#1.base|))) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-24 23:18:08,833 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-11-24 23:18:08,834 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-11-24 23:18:08,854 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 5 not checked. [2023-11-24 23:18:08,854 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:18:08,941 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [310219756] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:18:08,942 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1088548675] [2023-11-24 23:18:08,967 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-24 23:18:08,967 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:18:08,973 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:18:08,979 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:18:08,980 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:18:10,703 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 155 for LOIs [2023-11-24 23:18:11,561 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:18:28,478 WARN L876 $PredicateComparison]: unable to prove that (and (= 2 |c_ULTIMATE.start_dll_circular_create_#in~len#1|) (= |c_ULTIMATE.start_dll_circular_create_~last~0#1.base| |c_ULTIMATE.start_dll_circular_create_~head~0#1.base|) (let ((.cse1 (exists ((|v_#length_69| (Array Int Int))) (= |c_#length| (store |v_#length_69| |c_ULTIMATE.start_dll_circular_create_~head~0#1.base| 12)))) (.cse2 (= (select |c_ULTIMATE.start_main_old_#valid#1| |c_ULTIMATE.start_main_~#s~0#1.base|) 0)) (.cse3 (= (select |c_ULTIMATE.start_main_old_#valid#1| 0) 0)) (.cse4 (= (select |c_ULTIMATE.start_main_old_#valid#1| 2) 1)) (.cse5 (exists ((|v_#memory_$Pointer$.base_63| (Array Int (Array Int Int)))) (= |c_#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_63| |c_ULTIMATE.start_dll_circular_create_~head~0#1.base| (store (store (store (select |v_#memory_$Pointer$.base_63| |c_ULTIMATE.start_dll_circular_create_~head~0#1.base|) 0 0) 4 0) 8 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_dll_circular_create_~head~0#1.base|) 8)))))) (.cse6 (<= 12 (select |c_#length| |c_ULTIMATE.start_dll_circular_create_~head~0#1.base|))) (.cse7 (exists ((|v_#valid_87| (Array Int Int))) (and (= |c_#valid| (store |v_#valid_87| |c_ULTIMATE.start_dll_circular_create_~head~0#1.base| 1)) (= (select |v_#valid_87| |c_ULTIMATE.start_dll_circular_create_~head~0#1.base|) 0)))) (.cse8 (<= (+ |c_ULTIMATE.start_dll_circular_create_~head~0#1.base| 1) |c_#StackHeapBarrier|)) (.cse9 (exists ((|v_#length_68| (Array Int Int))) (and (= 2 (select |v_#length_68| 1)) (= 19 (select |v_#length_68| 2))))) (.cse10 (= (select |c_ULTIMATE.start_main_old_#valid#1| 1) 1)) (.cse11 (= (select |c_#valid| |c_ULTIMATE.start_dll_circular_create_~head~0#1.base|) 1)) (.cse12 (<= (+ |c_#StackHeapBarrier| 1) |c_ULTIMATE.start_main_~#s~0#1.base|)) (.cse13 (not (= |c_ULTIMATE.start_dll_circular_create_~head~0#1.base| 0))) (.cse14 (exists ((|v_#memory_$Pointer$.offset_63| (Array Int (Array Int Int)))) (= |c_#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_63| |c_ULTIMATE.start_dll_circular_create_~head~0#1.base| (store (store (store (select |v_#memory_$Pointer$.offset_63| |c_ULTIMATE.start_dll_circular_create_~head~0#1.base|) 0 0) 4 0) 8 (select (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_dll_circular_create_~head~0#1.base|) 8)))))) (.cse15 (exists ((|v_#memory_int_53| (Array Int (Array Int Int))) (|v_#memory_int_54| (Array Int (Array Int Int))) (|v_#memory_int_55| (Array Int (Array Int Int)))) (let ((.cse18 (select |v_#memory_int_54| |c_ULTIMATE.start_dll_circular_create_~head~0#1.base|)) (.cse17 (select |v_#memory_int_55| |c_ULTIMATE.start_dll_circular_create_~head~0#1.base|))) (and (= (store |v_#memory_int_55| |c_ULTIMATE.start_dll_circular_create_~head~0#1.base| (store .cse17 8 1)) |c_#memory_int|) (= (store |v_#memory_int_53| |c_ULTIMATE.start_dll_circular_create_~head~0#1.base| (store (select |v_#memory_int_53| |c_ULTIMATE.start_dll_circular_create_~head~0#1.base|) 0 (select .cse18 0))) |v_#memory_int_54|) (= |v_#memory_int_55| (store |v_#memory_int_54| |c_ULTIMATE.start_dll_circular_create_~head~0#1.base| (store .cse18 4 (select .cse17 4))))))))) (or (and (exists ((|v_old(#memory_int)_AFTER_CALL_3| (Array Int (Array Int Int)))) (let ((.cse0 (select |v_old(#memory_int)_AFTER_CALL_3| 1))) (and (= (select .cse0 1) 0) (= (select .cse0 0) 48)))) .cse1 .cse2 .cse3 .cse4 .cse5 .cse6 .cse7 .cse8 .cse9 .cse10 .cse11 .cse12 .cse13 .cse14 .cse15) (and .cse1 .cse2 .cse3 .cse4 .cse5 .cse6 .cse7 .cse8 .cse9 (exists ((|v_old(#memory_int)_AFTER_CALL_4| (Array Int (Array Int Int)))) (let ((.cse16 (select |v_old(#memory_int)_AFTER_CALL_4| 1))) (and (= 48 (select .cse16 0)) (= (select .cse16 1) 0)))) .cse10 .cse11 .cse12 .cse13 .cse14 .cse15))) (= |c_ULTIMATE.start_main_~#s~0#1.offset| 0) (= |c_ULTIMATE.start_dll_circular_create_~last~0#1.offset| 0) (<= 1 |c_#StackHeapBarrier|) (= |c_ULTIMATE.start_dll_circular_create_#in~data#1| 1) (= 0 |c_ULTIMATE.start_dll_circular_create_~head~0#1.offset|) (= |c_ULTIMATE.start_main_~data~0#1| 1) (= |c_ULTIMATE.start_dll_circular_create_~len#1| 2) (<= 2 |c_ULTIMATE.start_main_~#s~0#1.base|) (= |c_ULTIMATE.start_dll_circular_create_~data#1| 1) (= |c_ULTIMATE.start_main_~len~0#1| 2)) is different from true [2023-11-24 23:18:29,052 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1225#(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$.offset_66| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_66| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.offset_66| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0 0)))) (= |ULTIMATE.start_dll_circular_create_#in~len#1| 2) (= 2 |ULTIMATE.start_dll_circular_create_~len#1|) (= |ULTIMATE.start_main_~data~0#1| 1) (exists ((|v_#memory_int_56| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_56| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base| (store (select |v_#memory_int_56| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0 (select (select |#memory_int| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0))))) (<= 4 (select |#length| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|)) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_circular_create_~last~0#1.offset| 0) (not (= |ULTIMATE.start_dll_circular_create_~head~0#1.base| 0)) (exists ((|v_#memory_$Pointer$.base_66| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_66| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.base_66| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0 |ULTIMATE.start_dll_circular_create_~head~0#1.base|)) |#memory_$Pointer$.base|)) (= |ULTIMATE.start_dll_circular_create_~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 [2023-11-24 23:18:29,052 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:18:29,052 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-24 23:18:29,052 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 10 [2023-11-24 23:18:29,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108302918] [2023-11-24 23:18:29,053 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-24 23:18:29,053 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-24 23:18:29,053 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:18:29,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-24 23:18:29,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=428, Unknown=6, NotChecked=86, Total=600 [2023-11-24 23:18:29,055 INFO L87 Difference]: Start difference. First operand 82 states and 86 transitions. Second operand has 11 states, 8 states have (on average 2.75) internal successors, (22), 9 states have internal predecessors, (22), 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) [2023-11-24 23:18:29,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:18:29,502 INFO L93 Difference]: Finished difference Result 89 states and 95 transitions. [2023-11-24 23:18:29,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-24 23:18:29,503 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 2.75) internal successors, (22), 9 states have internal predecessors, (22), 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 [2023-11-24 23:18:29,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:18:29,504 INFO L225 Difference]: With dead ends: 89 [2023-11-24 23:18:29,504 INFO L226 Difference]: Without dead ends: 89 [2023-11-24 23:18:29,505 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=99, Invalid=503, Unknown=6, NotChecked=94, Total=702 [2023-11-24 23:18:29,506 INFO L413 NwaCegarLoop]: 65 mSDtfsCounter, 6 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 371 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 465 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 371 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 90 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-24 23:18:29,507 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 284 Invalid, 465 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 371 Invalid, 0 Unknown, 90 Unchecked, 0.3s Time] [2023-11-24 23:18:29,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2023-11-24 23:18:29,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2023-11-24 23:18:29,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 45 states have (on average 1.9555555555555555) internal successors, (88), 82 states have internal predecessors, (88), 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) [2023-11-24 23:18:29,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 94 transitions. [2023-11-24 23:18:29,514 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 94 transitions. Word has length 21 [2023-11-24 23:18:29,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:18:29,514 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 94 transitions. [2023-11-24 23:18:29,514 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 2.75) internal successors, (22), 9 states have internal predecessors, (22), 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) [2023-11-24 23:18:29,515 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 94 transitions. [2023-11-24 23:18:29,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-24 23:18:29,516 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:29,516 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:18:29,523 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-24 23:18:29,722 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:18:29,723 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 43 more)] === [2023-11-24 23:18:29,723 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:29,724 INFO L85 PathProgramCache]: Analyzing trace with hash 1441458397, now seen corresponding path program 1 times [2023-11-24 23:18:29,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:29,724 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194995820] [2023-11-24 23:18:29,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:29,724 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:29,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:30,229 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:18:30,229 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:30,229 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194995820] [2023-11-24 23:18:30,230 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1194995820] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:18:30,230 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [645012944] [2023-11-24 23:18:30,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:30,230 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:18:30,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:18:30,233 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:18:30,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-24 23:18:30,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:30,370 INFO L262 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 32 conjunts are in the unsatisfiable core [2023-11-24 23:18:30,375 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:18:30,381 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 [2023-11-24 23:18:30,494 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-24 23:18:30,494 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 [2023-11-24 23:18:30,503 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 [2023-11-24 23:18:30,536 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:18:30,537 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:18:30,683 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [645012944] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:18:30,683 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [131444793] [2023-11-24 23:18:30,687 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-24 23:18:30,687 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:18:30,688 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:18:30,688 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:18:30,688 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:18:31,579 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 155 for LOIs [2023-11-24 23:18:32,313 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:18:49,969 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1509#(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) (<= (select |#length| |ULTIMATE.start_dll_circular_create_~head~0#1.base|) 7) (= |ULTIMATE.start_dll_circular_create_#in~len#1| 2) (exists ((|v_#memory_$Pointer$.offset_80| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_80| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.offset_80| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0 0)))) (= 2 |ULTIMATE.start_dll_circular_create_~len#1|) (exists ((|v_#memory_$Pointer$.base_80| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_80| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.base_80| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base|) 0 |ULTIMATE.start_dll_circular_create_~head~0#1.base|)) |#memory_$Pointer$.base|)) (= |ULTIMATE.start_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_int_70| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_70| |ULTIMATE.start_dll_circular_create_~new_head~0#1.base| (store (select |v_#memory_int_70| |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))))) (not (= |ULTIMATE.start_dll_circular_create_~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 [2023-11-24 23:18:49,969 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:18:49,969 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-24 23:18:49,969 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 13 [2023-11-24 23:18:49,970 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844258448] [2023-11-24 23:18:49,970 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-24 23:18:49,970 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-24 23:18:49,970 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:18:49,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-24 23:18:49,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=707, Unknown=4, NotChecked=0, Total=812 [2023-11-24 23:18:49,972 INFO L87 Difference]: Start difference. First operand 87 states and 94 transitions. Second operand has 14 states, 10 states have (on average 2.4) internal successors, (24), 11 states have internal predecessors, (24), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-24 23:18:50,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:18:50,607 INFO L93 Difference]: Finished difference Result 89 states and 95 transitions. [2023-11-24 23:18:50,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-24 23:18:50,608 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 10 states have (on average 2.4) internal successors, (24), 11 states have internal predecessors, (24), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 21 [2023-11-24 23:18:50,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:18:50,608 INFO L225 Difference]: With dead ends: 89 [2023-11-24 23:18:50,609 INFO L226 Difference]: Without dead ends: 89 [2023-11-24 23:18:50,609 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=123, Invalid=803, Unknown=4, NotChecked=0, Total=930 [2023-11-24 23:18:50,610 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 4 mSDsluCounter, 327 mSDsCounter, 0 mSdLazyCounter, 612 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 393 SdHoareTripleChecker+Invalid, 618 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 612 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-24 23:18:50,610 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 393 Invalid, 618 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 612 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-24 23:18:50,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2023-11-24 23:18:50,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2023-11-24 23:18:50,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 45 states have (on average 1.9333333333333333) internal successors, (87), 82 states have internal predecessors, (87), 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) [2023-11-24 23:18:50,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 93 transitions. [2023-11-24 23:18:50,617 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 93 transitions. Word has length 21 [2023-11-24 23:18:50,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:18:50,617 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 93 transitions. [2023-11-24 23:18:50,617 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 10 states have (on average 2.4) internal successors, (24), 11 states have internal predecessors, (24), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-24 23:18:50,617 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 93 transitions. [2023-11-24 23:18:50,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-24 23:18:50,618 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:18:50,618 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:18:50,633 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-24 23:18:50,833 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:18:50,833 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 43 more)] === [2023-11-24 23:18:50,834 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:18:50,834 INFO L85 PathProgramCache]: Analyzing trace with hash -2032759113, now seen corresponding path program 1 times [2023-11-24 23:18:50,834 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:18:50,834 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699689609] [2023-11-24 23:18:50,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:50,834 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:18:50,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:50,932 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:18:50,932 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:18:50,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699689609] [2023-11-24 23:18:50,933 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699689609] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:18:50,933 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302021071] [2023-11-24 23:18:50,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:18:50,933 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:18:50,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:18:50,937 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:18:50,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-24 23:18:51,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:18:51,077 INFO L262 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-24 23:18:51,079 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:18:51,098 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:18:51,099 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:18:51,132 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:18:51,132 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [302021071] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:18:51,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [41104873] [2023-11-24 23:18:51,137 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-24 23:18:51,137 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:18:51,138 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:18:51,138 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:18:51,138 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:18:52,055 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-24 23:18:52,193 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:19:02,607 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1840#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_dll_circular_create_#in~data#1| 1) (= |ULTIMATE.start_dll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_dll_circular_create_#in~len#1| 2) (not (= (select |#valid| |ULTIMATE.start_dll_circular_create_~last~0#1.base|) 1)) (= |ULTIMATE.start_main_~data~0#1| 1) (= |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) (<= |ULTIMATE.start_dll_circular_create_~len#1| 1) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_dll_circular_create_~data#1| 1))' at error location [2023-11-24 23:19:02,608 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:19:02,608 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:19:02,608 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 6 [2023-11-24 23:19:02,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916887455] [2023-11-24 23:19:02,608 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:19:02,608 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-24 23:19:02,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:19:02,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-24 23:19:02,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=358, Unknown=4, NotChecked=0, Total=420 [2023-11-24 23:19:02,610 INFO L87 Difference]: Start difference. First operand 87 states and 93 transitions. Second operand has 6 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:19:02,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:19:02,731 INFO L93 Difference]: Finished difference Result 88 states and 93 transitions. [2023-11-24 23:19:02,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:19:02,732 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2023-11-24 23:19:02,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:19:02,733 INFO L225 Difference]: With dead ends: 88 [2023-11-24 23:19:02,733 INFO L226 Difference]: Without dead ends: 88 [2023-11-24 23:19:02,734 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=63, Invalid=395, Unknown=4, NotChecked=0, Total=462 [2023-11-24 23:19:02,737 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 3 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 336 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:19:02,737 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 336 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:19:02,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2023-11-24 23:19:02,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2023-11-24 23:19:02,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 45 states have (on average 1.9111111111111112) internal successors, (86), 82 states have internal predecessors, (86), 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) [2023-11-24 23:19:02,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 92 transitions. [2023-11-24 23:19:02,754 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 92 transitions. Word has length 23 [2023-11-24 23:19:02,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:19:02,756 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 92 transitions. [2023-11-24 23:19:02,757 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:19:02,757 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 92 transitions. [2023-11-24 23:19:02,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-24 23:19:02,758 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:19:02,758 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:19:02,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-24 23:19:02,969 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58e42357-57cf-4bd2-9624-e1f091c6a4f8/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:19:02,970 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 43 more)] === [2023-11-24 23:19:02,970 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:19:02,970 INFO L85 PathProgramCache]: Analyzing trace with hash 1404052124, now seen corresponding path program 1 times [2023-11-24 23:19:02,970 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:19:02,970 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018171532] [2023-11-24 23:19:02,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:19:02,971 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:19:02,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat