./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/sll2c_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-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/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_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/sll2c_remove_all.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/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_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/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 cd9bd7b6c1446abd728b90c98a54cb367face4c5994cfeca4979c2dbc50ad4d3 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-25 00:08:51,841 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-25 00:08:51,942 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-25 00:08:51,946 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-25 00:08:51,947 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-25 00:08:51,971 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-25 00:08:51,972 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-25 00:08:51,972 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-25 00:08:51,973 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-25 00:08:51,974 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-25 00:08:51,974 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-25 00:08:51,975 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-25 00:08:51,976 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-25 00:08:51,976 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-25 00:08:51,977 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-25 00:08:51,977 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-25 00:08:51,978 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-25 00:08:51,978 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-25 00:08:51,979 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-25 00:08:51,979 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-25 00:08:51,980 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-25 00:08:51,981 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-25 00:08:51,981 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-25 00:08:51,982 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-25 00:08:51,982 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-25 00:08:51,983 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-25 00:08:51,983 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-25 00:08:51,983 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-25 00:08:51,984 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-25 00:08:51,984 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-25 00:08:51,985 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-25 00:08:51,985 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-25 00:08:51,986 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-25 00:08:51,986 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-25 00:08:51,986 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-25 00:08:51,986 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-25 00:08:51,987 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-25 00:08:51,987 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-25 00:08:51,987 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-25 00:08:51,988 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-25 00:08:51,988 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-25 00:08:51,988 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-25 00:08:51,989 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-25 00:08:51,989 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-25 00:08:51,989 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-25 00:08:51,989 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-25 00:08:51,990 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-25 00:08:51,990 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-25 00:08:51,990 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_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cd9bd7b6c1446abd728b90c98a54cb367face4c5994cfeca4979c2dbc50ad4d3 [2023-11-25 00:08:52,282 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-25 00:08:52,304 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-25 00:08:52,306 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-25 00:08:52,308 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-25 00:08:52,308 INFO L274 PluginConnector]: CDTParser initialized [2023-11-25 00:08:52,310 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/list-simple/sll2c_remove_all.i [2023-11-25 00:08:55,370 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-25 00:08:55,660 INFO L384 CDTParser]: Found 1 translation units. [2023-11-25 00:08:55,661 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/sv-benchmarks/c/list-simple/sll2c_remove_all.i [2023-11-25 00:08:55,682 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/data/3e25b1971/8a1db56f92f747399f8f44b045585956/FLAG75173aaa2 [2023-11-25 00:08:55,698 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/data/3e25b1971/8a1db56f92f747399f8f44b045585956 [2023-11-25 00:08:55,706 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-25 00:08:55,709 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-25 00:08:55,712 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-25 00:08:55,712 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-25 00:08:55,717 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-25 00:08:55,718 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 12:08:55" (1/1) ... [2023-11-25 00:08:55,719 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4a8429df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:08:55, skipping insertion in model container [2023-11-25 00:08:55,719 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 12:08:55" (1/1) ... [2023-11-25 00:08:55,785 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-25 00:08:56,070 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-25 00:08:56,080 INFO L202 MainTranslator]: Completed pre-run [2023-11-25 00:08:56,123 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-25 00:08:56,159 INFO L206 MainTranslator]: Completed translation [2023-11-25 00:08:56,159 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:08:56 WrapperNode [2023-11-25 00:08:56,159 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-25 00:08:56,161 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-25 00:08:56,162 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-25 00:08:56,162 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-25 00:08:56,170 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:08:56" (1/1) ... [2023-11-25 00:08:56,184 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:08:56" (1/1) ... [2023-11-25 00:08:56,209 INFO L138 Inliner]: procedures = 126, calls = 37, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 121 [2023-11-25 00:08:56,209 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-25 00:08:56,210 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-25 00:08:56,210 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-25 00:08:56,210 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-25 00:08:56,219 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:08:56" (1/1) ... [2023-11-25 00:08:56,220 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:08:56" (1/1) ... [2023-11-25 00:08:56,225 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:08:56" (1/1) ... [2023-11-25 00:08:56,225 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:08:56" (1/1) ... [2023-11-25 00:08:56,234 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:08:56" (1/1) ... [2023-11-25 00:08:56,251 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:08:56" (1/1) ... [2023-11-25 00:08:56,254 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:08:56" (1/1) ... [2023-11-25 00:08:56,255 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:08:56" (1/1) ... [2023-11-25 00:08:56,259 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-25 00:08:56,260 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-25 00:08:56,260 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-25 00:08:56,260 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-25 00:08:56,261 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:08:56" (1/1) ... [2023-11-25 00:08:56,268 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-25 00:08:56,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:08:56,306 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-25 00:08:56,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-25 00:08:56,344 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-25 00:08:56,344 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-25 00:08:56,344 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-25 00:08:56,344 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-25 00:08:56,344 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-25 00:08:56,345 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-25 00:08:56,345 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-25 00:08:56,345 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-25 00:08:56,345 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-25 00:08:56,345 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-25 00:08:56,345 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-25 00:08:56,346 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-25 00:08:56,346 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-25 00:08:56,499 INFO L241 CfgBuilder]: Building ICFG [2023-11-25 00:08:56,502 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-25 00:08:56,898 INFO L282 CfgBuilder]: Performing block encoding [2023-11-25 00:08:56,978 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-25 00:08:56,978 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-25 00:08:56,980 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 12:08:56 BoogieIcfgContainer [2023-11-25 00:08:56,980 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-25 00:08:56,984 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-25 00:08:56,984 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-25 00:08:56,988 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-25 00:08:56,989 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 12:08:55" (1/3) ... [2023-11-25 00:08:56,990 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@181aa865 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 12:08:56, skipping insertion in model container [2023-11-25 00:08:56,990 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:08:56" (2/3) ... [2023-11-25 00:08:56,993 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@181aa865 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 12:08:56, skipping insertion in model container [2023-11-25 00:08:56,993 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 12:08:56" (3/3) ... [2023-11-25 00:08:56,995 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2c_remove_all.i [2023-11-25 00:08:57,042 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-25 00:08:57,042 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 42 error locations. [2023-11-25 00:08:57,121 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-25 00:08:57,128 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;@67db5501, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-25 00:08:57,128 INFO L358 AbstractCegarLoop]: Starting to check reachability of 42 error locations. [2023-11-25 00:08:57,133 INFO L276 IsEmpty]: Start isEmpty. Operand has 85 states, 39 states have (on average 2.282051282051282) internal successors, (89), 81 states have internal predecessors, (89), 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) [2023-11-25 00:08:57,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-25 00:08:57,139 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:08:57,140 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-25 00:08:57,141 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:08:57,146 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:08:57,146 INFO L85 PathProgramCache]: Analyzing trace with hash 181978514, now seen corresponding path program 1 times [2023-11-25 00:08:57,156 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:08:57,157 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1536753242] [2023-11-25 00:08:57,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:08:57,158 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:08:57,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:08:57,450 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:08:57,450 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:08:57,451 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1536753242] [2023-11-25 00:08:57,451 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1536753242] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:08:57,452 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:08:57,452 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-25 00:08:57,454 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665652412] [2023-11-25 00:08:57,455 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:08:57,459 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:08:57,460 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:08:57,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:08:57,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:08:57,513 INFO L87 Difference]: Start difference. First operand has 85 states, 39 states have (on average 2.282051282051282) internal successors, (89), 81 states have internal predecessors, (89), 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) [2023-11-25 00:08:57,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:08:57,677 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2023-11-25 00:08:57,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:08:57,680 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-25 00:08:57,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:08:57,689 INFO L225 Difference]: With dead ends: 82 [2023-11-25 00:08:57,689 INFO L226 Difference]: Without dead ends: 80 [2023-11-25 00:08:57,691 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:08:57,695 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 6 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-25 00:08:57,697 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 106 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-25 00:08:57,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-11-25 00:08:57,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2023-11-25 00:08:57,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 37 states have (on average 2.1621621621621623) internal successors, (80), 76 states have internal predecessors, (80), 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) [2023-11-25 00:08:57,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 84 transitions. [2023-11-25 00:08:57,751 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 84 transitions. Word has length 5 [2023-11-25 00:08:57,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:08:57,751 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 84 transitions. [2023-11-25 00:08:57,752 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:08:57,752 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 84 transitions. [2023-11-25 00:08:57,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-25 00:08:57,752 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:08:57,753 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-25 00:08:57,753 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-25 00:08:57,754 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:08:57,754 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:08:57,755 INFO L85 PathProgramCache]: Analyzing trace with hash 181978515, now seen corresponding path program 1 times [2023-11-25 00:08:57,755 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:08:57,756 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182755688] [2023-11-25 00:08:57,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:08:57,756 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:08:57,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:08:57,899 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:08:57,899 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:08:57,900 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182755688] [2023-11-25 00:08:57,900 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1182755688] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:08:57,900 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:08:57,900 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-25 00:08:57,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048683643] [2023-11-25 00:08:57,901 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:08:57,902 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:08:57,902 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:08:57,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:08:57,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:08:57,903 INFO L87 Difference]: Start difference. First operand 80 states and 84 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:08:57,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:08:57,989 INFO L93 Difference]: Finished difference Result 78 states and 82 transitions. [2023-11-25 00:08:57,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:08:57,990 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-25 00:08:57,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:08:57,992 INFO L225 Difference]: With dead ends: 78 [2023-11-25 00:08:57,992 INFO L226 Difference]: Without dead ends: 78 [2023-11-25 00:08:57,992 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:08:57,994 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 2 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-25 00:08:57,995 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 111 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-25 00:08:57,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2023-11-25 00:08:58,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2023-11-25 00:08:58,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 37 states have (on average 2.108108108108108) internal successors, (78), 74 states have internal predecessors, (78), 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) [2023-11-25 00:08:58,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 82 transitions. [2023-11-25 00:08:58,004 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 82 transitions. Word has length 5 [2023-11-25 00:08:58,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:08:58,005 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 82 transitions. [2023-11-25 00:08:58,005 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:08:58,005 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 82 transitions. [2023-11-25 00:08:58,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-25 00:08:58,006 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:08:58,006 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:08:58,006 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-25 00:08:58,007 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:08:58,007 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:08:58,007 INFO L85 PathProgramCache]: Analyzing trace with hash 666899088, now seen corresponding path program 1 times [2023-11-25 00:08:58,008 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:08:58,008 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [514821598] [2023-11-25 00:08:58,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:08:58,008 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:08:58,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:08:58,133 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:08:58,133 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:08:58,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [514821598] [2023-11-25 00:08:58,133 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [514821598] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:08:58,134 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:08:58,134 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-25 00:08:58,134 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [351949615] [2023-11-25 00:08:58,134 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:08:58,135 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:08:58,135 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:08:58,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:08:58,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:08:58,137 INFO L87 Difference]: Start difference. First operand 78 states and 82 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-25 00:08:58,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:08:58,171 INFO L93 Difference]: Finished difference Result 79 states and 83 transitions. [2023-11-25 00:08:58,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:08:58,172 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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 10 [2023-11-25 00:08:58,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:08:58,173 INFO L225 Difference]: With dead ends: 79 [2023-11-25 00:08:58,173 INFO L226 Difference]: Without dead ends: 79 [2023-11-25 00:08:58,173 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:08:58,175 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 4 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-25 00:08:58,176 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 134 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-25 00:08:58,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2023-11-25 00:08:58,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2023-11-25 00:08:58,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 38 states have (on average 2.0789473684210527) internal successors, (79), 75 states have internal predecessors, (79), 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) [2023-11-25 00:08:58,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 83 transitions. [2023-11-25 00:08:58,185 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 83 transitions. Word has length 10 [2023-11-25 00:08:58,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:08:58,186 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 83 transitions. [2023-11-25 00:08:58,187 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-25 00:08:58,187 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 83 transitions. [2023-11-25 00:08:58,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-25 00:08:58,188 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:08:58,188 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:08:58,188 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-25 00:08:58,189 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:08:58,189 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:08:58,189 INFO L85 PathProgramCache]: Analyzing trace with hash 686289329, now seen corresponding path program 1 times [2023-11-25 00:08:58,189 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:08:58,190 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687844234] [2023-11-25 00:08:58,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:08:58,190 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:08:58,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:08:58,358 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-25 00:08:58,358 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:08:58,358 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687844234] [2023-11-25 00:08:58,359 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1687844234] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:08:58,359 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:08:58,359 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-25 00:08:58,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137715490] [2023-11-25 00:08:58,359 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:08:58,360 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-25 00:08:58,360 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:08:58,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-25 00:08:58,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-25 00:08:58,362 INFO L87 Difference]: Start difference. First operand 79 states and 83 transitions. Second operand has 6 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:08:58,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:08:58,537 INFO L93 Difference]: Finished difference Result 78 states and 82 transitions. [2023-11-25 00:08:58,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-25 00:08:58,538 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 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 17 [2023-11-25 00:08:58,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:08:58,539 INFO L225 Difference]: With dead ends: 78 [2023-11-25 00:08:58,539 INFO L226 Difference]: Without dead ends: 78 [2023-11-25 00:08:58,540 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-25 00:08:58,541 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 3 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-25 00:08:58,541 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 202 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 195 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-25 00:08:58,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2023-11-25 00:08:58,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2023-11-25 00:08:58,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 38 states have (on average 2.0526315789473686) internal successors, (78), 74 states have internal predecessors, (78), 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) [2023-11-25 00:08:58,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 82 transitions. [2023-11-25 00:08:58,549 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 82 transitions. Word has length 17 [2023-11-25 00:08:58,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:08:58,549 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 82 transitions. [2023-11-25 00:08:58,549 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:08:58,550 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 82 transitions. [2023-11-25 00:08:58,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-25 00:08:58,550 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:08:58,550 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:08:58,551 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-25 00:08:58,551 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:08:58,551 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:08:58,552 INFO L85 PathProgramCache]: Analyzing trace with hash 686289330, now seen corresponding path program 1 times [2023-11-25 00:08:58,552 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:08:58,552 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131627016] [2023-11-25 00:08:58,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:08:58,552 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:08:58,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:08:58,784 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-25 00:08:58,784 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:08:58,785 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131627016] [2023-11-25 00:08:58,785 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2131627016] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:08:58,785 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:08:58,785 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-25 00:08:58,785 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957268470] [2023-11-25 00:08:58,786 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:08:58,786 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-25 00:08:58,786 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:08:58,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-25 00:08:58,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-25 00:08:58,787 INFO L87 Difference]: Start difference. First operand 78 states and 82 transitions. Second operand has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:08:58,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:08:58,977 INFO L93 Difference]: Finished difference Result 77 states and 81 transitions. [2023-11-25 00:08:58,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-25 00:08:58,977 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 17 [2023-11-25 00:08:58,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:08:58,980 INFO L225 Difference]: With dead ends: 77 [2023-11-25 00:08:58,980 INFO L226 Difference]: Without dead ends: 77 [2023-11-25 00:08:58,980 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-25 00:08:58,983 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 1 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-25 00:08:58,984 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 226 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-25 00:08:58,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2023-11-25 00:08:58,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2023-11-25 00:08:58,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 38 states have (on average 2.026315789473684) internal successors, (77), 73 states have internal predecessors, (77), 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) [2023-11-25 00:08:59,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 81 transitions. [2023-11-25 00:08:59,000 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 81 transitions. Word has length 17 [2023-11-25 00:08:59,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:08:59,001 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 81 transitions. [2023-11-25 00:08:59,001 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:08:59,001 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 81 transitions. [2023-11-25 00:08:59,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-25 00:08:59,002 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:08:59,002 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:08:59,002 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-25 00:08:59,003 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:08:59,003 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:08:59,003 INFO L85 PathProgramCache]: Analyzing trace with hash -1900770924, now seen corresponding path program 1 times [2023-11-25 00:08:59,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:08:59,004 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [268413606] [2023-11-25 00:08:59,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:08:59,004 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:08:59,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:08:59,353 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-25 00:08:59,354 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:08:59,354 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [268413606] [2023-11-25 00:08:59,354 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [268413606] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:08:59,354 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1319822999] [2023-11-25 00:08:59,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:08:59,355 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:08:59,355 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:08:59,364 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:08:59,378 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-25 00:08:59,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:08:59,506 INFO L262 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-25 00:08:59,521 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:08:59,580 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-25 00:08:59,672 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 [2023-11-25 00:08:59,750 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-11-25 00:08:59,750 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 [2023-11-25 00:08:59,773 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 4 not checked. [2023-11-25 00:08:59,773 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:08:59,859 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1319822999] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:08:59,859 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1163935250] [2023-11-25 00:08:59,879 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-25 00:08:59,880 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:08:59,884 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:08:59,890 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:08:59,890 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:09:01,483 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-25 00:09:01,654 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:09:02,833 WARN L876 $PredicateComparison]: unable to prove that (and (= |c_ULTIMATE.start_sll_circular_create_~data#1| 1) (= |c_ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 1 |c_#StackHeapBarrier|) (= |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.offset| 0) (= |c_ULTIMATE.start_main_~data~0#1| 1) (= 2 |c_ULTIMATE.start_sll_circular_create_#in~len#1|) (= |c_ULTIMATE.start_sll_circular_create_#in~data#1| 1) (let ((.cse1 (exists ((|v_#memory_int_44| (Array Int (Array Int Int))) (|v_#memory_int_45| (Array Int (Array Int Int)))) (let ((.cse17 (select |v_#memory_int_45| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base|))) (and (= (store |v_#memory_int_45| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base| (store .cse17 4 1)) |c_#memory_int|) (= (store |v_#memory_int_44| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base| (store (select |v_#memory_int_44| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base|) 0 (select .cse17 0))) |v_#memory_int_45|))))) (.cse2 (exists ((|v_#length_66| (Array Int Int))) (and (= 2 (select |v_#length_66| 1)) (= 19 (select |v_#length_66| 2))))) (.cse3 (exists ((|v_#memory_$Pointer$.base_60| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_60| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base| (store (store (select |v_#memory_$Pointer$.base_60| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base|) 0 0) 4 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base|) 4))) |c_#memory_$Pointer$.base|))) (.cse4 (= (select |c_ULTIMATE.start_main_old_#valid#1| |c_ULTIMATE.start_main_~#s~0#1.base|) 0)) (.cse5 (<= 8 (select |c_#length| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base|))) (.cse6 (= (select |c_ULTIMATE.start_main_old_#valid#1| 0) 0)) (.cse7 (= (select |c_ULTIMATE.start_main_old_#valid#1| 2) 1)) (.cse8 (exists ((|v_#length_67| (Array Int Int))) (= (store |v_#length_67| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base| 8) |c_#length|))) (.cse9 (<= (+ |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base| 1) |c_#StackHeapBarrier|)) (.cse10 (exists ((|v_#memory_$Pointer$.offset_60| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.offset_60| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base| (store (store (select |v_#memory_$Pointer$.offset_60| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base|) 0 0) 4 (select (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base|) 4))) |c_#memory_$Pointer$.offset|))) (.cse11 (= (select |c_#valid| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base|) 1)) (.cse12 (not (= |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base| 0))) (.cse13 (= (select |c_ULTIMATE.start_main_old_#valid#1| 1) 1)) (.cse14 (<= (+ |c_#StackHeapBarrier| 1) |c_ULTIMATE.start_main_~#s~0#1.base|)) (.cse15 (exists ((|v_#valid_85| (Array Int Int))) (and (= |c_#valid| (store |v_#valid_85| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base| 1)) (= (select |v_#valid_85| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base|) 0))))) (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 .cse10 .cse11 (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)))) .cse12 .cse13 .cse14 .cse15))) (<= 2 |c_ULTIMATE.start_main_~#s~0#1.base|) (= |c_ULTIMATE.start_sll_circular_create_~len#1| 2) (= |c_ULTIMATE.start_main_~len~0#1| 2)) is different from true [2023-11-25 00:09:03,469 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '980#(and (not (= (select |#valid| |ULTIMATE.start_sll_circular_create_~last~0#1.base|) 1)) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_create_#in~data#1| 1) (= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 0) (<= |ULTIMATE.start_sll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_circular_create_~data#1| 1))' at error location [2023-11-25 00:09:03,469 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:09:03,469 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-25 00:09:03,469 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 10 [2023-11-25 00:09:03,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34698649] [2023-11-25 00:09:03,470 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-25 00:09:03,470 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-25 00:09:03,470 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:09:03,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-25 00:09:03,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=393, Unknown=2, NotChecked=82, Total=552 [2023-11-25 00:09:03,472 INFO L87 Difference]: Start difference. First operand 77 states and 81 transitions. Second operand has 11 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-25 00:09:03,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:09:03,783 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2023-11-25 00:09:03,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-25 00:09:03,784 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 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 19 [2023-11-25 00:09:03,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:09:03,786 INFO L225 Difference]: With dead ends: 76 [2023-11-25 00:09:03,786 INFO L226 Difference]: Without dead ends: 76 [2023-11-25 00:09:03,786 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=93, Invalid=465, Unknown=2, NotChecked=90, Total=650 [2023-11-25 00:09:03,788 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 6 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 282 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 361 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 282 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 75 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-25 00:09:03,788 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 250 Invalid, 361 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 282 Invalid, 0 Unknown, 75 Unchecked, 0.2s Time] [2023-11-25 00:09:03,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-11-25 00:09:03,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2023-11-25 00:09:03,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 38 states have (on average 2.0) internal successors, (76), 72 states have internal predecessors, (76), 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) [2023-11-25 00:09:03,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2023-11-25 00:09:03,794 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 19 [2023-11-25 00:09:03,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:09:03,795 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2023-11-25 00:09:03,795 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-25 00:09:03,795 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2023-11-25 00:09:03,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-25 00:09:03,796 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:09:03,796 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:09:03,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-25 00:09:04,001 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:09:04,002 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:09:04,002 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:09:04,003 INFO L85 PathProgramCache]: Analyzing trace with hash -1900770923, now seen corresponding path program 1 times [2023-11-25 00:09:04,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:09:04,003 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114553410] [2023-11-25 00:09:04,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:04,003 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:09:04,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:04,430 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:09:04,430 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:09:04,430 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114553410] [2023-11-25 00:09:04,431 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1114553410] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:09:04,431 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1200135798] [2023-11-25 00:09:04,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:04,432 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:09:04,432 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:09:04,433 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:09:04,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-25 00:09:04,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:04,568 INFO L262 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 29 conjunts are in the unsatisfiable core [2023-11-25 00:09:04,571 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:09:04,578 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-25 00:09:04,714 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (= (store |c_old(#length)| |node_create_~temp~0#1.base| (select |c_#length| |node_create_~temp~0#1.base|)) |c_#length|) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-25 00:09:04,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:09:04,745 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 16 treesize of output 11 [2023-11-25 00:09:04,758 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-25 00:09:04,758 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-25 00:09:04,794 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 4 not checked. [2023-11-25 00:09:04,794 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:09:04,941 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1200135798] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:09:04,941 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [521298535] [2023-11-25 00:09:04,947 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-25 00:09:04,947 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:09:04,947 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:09:04,948 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:09:04,948 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:09:05,959 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-25 00:09:06,086 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:09:08,693 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1236#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_create_#in~data#1| 1) (= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 0) (<= (select |#length| |ULTIMATE.start_sll_circular_create_~last~0#1.base|) 3) (<= |ULTIMATE.start_sll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_circular_create_~data#1| 1))' at error location [2023-11-25 00:09:08,694 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:09:08,694 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-25 00:09:08,694 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 16 [2023-11-25 00:09:08,694 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254124658] [2023-11-25 00:09:08,694 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-25 00:09:08,695 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-25 00:09:08,695 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:09:08,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-25 00:09:08,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=768, Unknown=1, NotChecked=56, Total=930 [2023-11-25 00:09:08,696 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand has 17 states, 13 states have (on average 2.230769230769231) internal successors, (29), 14 states have internal predecessors, (29), 3 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-25 00:09:09,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:09:09,273 INFO L93 Difference]: Finished difference Result 76 states and 81 transitions. [2023-11-25 00:09:09,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-25 00:09:09,274 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 13 states have (on average 2.230769230769231) internal successors, (29), 14 states have internal predecessors, (29), 3 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 19 [2023-11-25 00:09:09,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:09:09,276 INFO L225 Difference]: With dead ends: 76 [2023-11-25 00:09:09,276 INFO L226 Difference]: Without dead ends: 76 [2023-11-25 00:09:09,277 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=126, Invalid=869, Unknown=1, NotChecked=60, Total=1056 [2023-11-25 00:09:09,278 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 5 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 402 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 484 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 77 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-25 00:09:09,278 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 284 Invalid, 484 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 402 Invalid, 0 Unknown, 77 Unchecked, 0.4s Time] [2023-11-25 00:09:09,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-11-25 00:09:09,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2023-11-25 00:09:09,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 38 states have (on average 1.9736842105263157) internal successors, (75), 71 states have internal predecessors, (75), 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) [2023-11-25 00:09:09,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 79 transitions. [2023-11-25 00:09:09,285 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 79 transitions. Word has length 19 [2023-11-25 00:09:09,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:09:09,285 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 79 transitions. [2023-11-25 00:09:09,286 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 13 states have (on average 2.230769230769231) internal successors, (29), 14 states have internal predecessors, (29), 3 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-25 00:09:09,286 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 79 transitions. [2023-11-25 00:09:09,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-25 00:09:09,287 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:09:09,287 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:09:09,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-25 00:09:09,498 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:09:09,499 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:09:09,499 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:09:09,499 INFO L85 PathProgramCache]: Analyzing trace with hash -1279626243, now seen corresponding path program 1 times [2023-11-25 00:09:09,499 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:09:09,500 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967629519] [2023-11-25 00:09:09,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:09,500 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:09:09,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:09,828 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-25 00:09:09,828 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:09:09,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967629519] [2023-11-25 00:09:09,829 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1967629519] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:09:09,829 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1157219248] [2023-11-25 00:09:09,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:09,829 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:09:09,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:09:09,833 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:09:09,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-25 00:09:09,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:09,976 INFO L262 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-25 00:09:09,978 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:09:09,982 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-25 00:09:10,020 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-25 00:09:10,021 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 13 [2023-11-25 00:09:10,072 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| 1))) is different from true [2023-11-25 00:09:10,101 INFO L349 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2023-11-25 00:09:10,102 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 22 [2023-11-25 00:09:10,176 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 4 not checked. [2023-11-25 00:09:10,177 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:09:10,605 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-25 00:09:10,605 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1157219248] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:09:10,605 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [248057248] [2023-11-25 00:09:10,608 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-25 00:09:10,608 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:09:10,609 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:09:10,609 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:09:10,609 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:09:11,561 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-25 00:09:11,670 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:09:14,113 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1543#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (not (= (select |#valid| |ULTIMATE.start_sll_circular_remove_first_~head#1.base|) 1)) (exists ((|v_#memory_$Pointer$.base_98| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_98| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_17| Int) (|v_#memory_int_82| (Array Int (Array Int Int)))) (and (<= 4 (select |#length| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_17|)) (= (store |v_#memory_$Pointer$.base_98| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_17| (store (select |v_#memory_$Pointer$.base_98| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_17|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|)) |#memory_$Pointer$.base|) (= (select |#valid| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_17|) 1) (= (store |v_#memory_$Pointer$.offset_98| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_17| (store (select |v_#memory_$Pointer$.offset_98| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_17|) 0 0)) |#memory_$Pointer$.offset|) (= (store |v_#memory_int_82| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_17| (store (select |v_#memory_int_82| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_17|) 0 (select (select |#memory_int| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_17|) 0))) |#memory_int|))) (= |ULTIMATE.start_sll_circular_remove_first_~head#1.base| |ULTIMATE.start_sll_circular_remove_first_#in~head#1.base|) (= |ULTIMATE.start_sll_circular_remove_first_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_circular_create_#res#1.base|) (= |ULTIMATE.start_main_~data~0#1| 1) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) 0) 0) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_remove_first_~head#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_sll_circular_remove_first_#in~head#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-11-25 00:09:14,114 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:09:14,114 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:09:14,114 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 18 [2023-11-25 00:09:14,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126065419] [2023-11-25 00:09:14,114 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:09:14,115 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-25 00:09:14,115 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:09:14,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-25 00:09:14,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=903, Unknown=1, NotChecked=62, Total=1122 [2023-11-25 00:09:14,117 INFO L87 Difference]: Start difference. First operand 75 states and 79 transitions. Second operand has 20 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 2 states have call successors, (5), 2 states have call predecessors, (5), 6 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-25 00:09:14,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:09:14,637 INFO L93 Difference]: Finished difference Result 111 states and 118 transitions. [2023-11-25 00:09:14,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-25 00:09:14,638 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 2 states have call successors, (5), 2 states have call predecessors, (5), 6 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) Word has length 21 [2023-11-25 00:09:14,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:09:14,639 INFO L225 Difference]: With dead ends: 111 [2023-11-25 00:09:14,639 INFO L226 Difference]: Without dead ends: 111 [2023-11-25 00:09:14,640 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 36 SyntacticMatches, 4 SemanticMatches, 35 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 408 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=192, Invalid=1071, Unknown=1, NotChecked=68, Total=1332 [2023-11-25 00:09:14,641 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 123 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 413 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 543 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 113 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-25 00:09:14,641 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [123 Valid, 217 Invalid, 543 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 413 Invalid, 0 Unknown, 113 Unchecked, 0.4s Time] [2023-11-25 00:09:14,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2023-11-25 00:09:14,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 73. [2023-11-25 00:09:14,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 41 states have (on average 1.853658536585366) internal successors, (76), 69 states have internal predecessors, (76), 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) [2023-11-25 00:09:14,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 80 transitions. [2023-11-25 00:09:14,646 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 80 transitions. Word has length 21 [2023-11-25 00:09:14,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:09:14,647 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 80 transitions. [2023-11-25 00:09:14,647 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 2 states have call successors, (5), 2 states have call predecessors, (5), 6 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-25 00:09:14,647 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 80 transitions. [2023-11-25 00:09:14,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-25 00:09:14,648 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:09:14,648 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:09:14,659 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-25 00:09:14,854 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-25 00:09:14,855 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:09:14,855 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:09:14,855 INFO L85 PathProgramCache]: Analyzing trace with hash -1279626242, now seen corresponding path program 1 times [2023-11-25 00:09:14,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:09:14,855 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1735184150] [2023-11-25 00:09:14,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:14,856 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:09:14,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:15,330 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:09:15,330 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:09:15,330 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1735184150] [2023-11-25 00:09:15,330 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1735184150] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:09:15,330 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1468387689] [2023-11-25 00:09:15,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:15,331 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:09:15,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:09:15,332 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:09:15,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-25 00:09:15,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:15,475 INFO L262 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-25 00:09:15,477 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:09:15,483 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-25 00:09:15,500 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-25 00:09:15,508 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= (store |c_old(#length)| |node_create_~temp~0#1.base| (select |c_#length| |node_create_~temp~0#1.base|)) |c_#length|))) is different from true [2023-11-25 00:09:15,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:09:15,537 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-25 00:09:15,564 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-25 00:09:15,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:09:15,601 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-25 00:09:15,626 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-25 00:09:15,626 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:09:15,791 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1468387689] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:09:15,791 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1219178585] [2023-11-25 00:09:15,793 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-25 00:09:15,794 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:09:15,794 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:09:15,794 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:09:15,794 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:09:16,607 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-25 00:09:16,713 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:09:19,366 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1844#(and (<= (select |#length| |ULTIMATE.start_sll_circular_remove_first_~head#1.base|) 3) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (= |ULTIMATE.start_sll_circular_remove_first_~head#1.base| |ULTIMATE.start_sll_circular_remove_first_#in~head#1.base|) (exists ((|v_#memory_int_96| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_112| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_112| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| Int)) (and (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_112| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| (store (select |v_#memory_$Pointer$.base_112| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|))) (<= 4 (select |#length| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|)) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_112| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| (store (select |v_#memory_$Pointer$.offset_112| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0 0))) (= |#memory_int| (store |v_#memory_int_96| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| (store (select |v_#memory_int_96| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0 (select (select |#memory_int| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0)))) (= (select |#valid| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 1))) (= |ULTIMATE.start_sll_circular_remove_first_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_circular_create_#res#1.base|) (= |ULTIMATE.start_main_~data~0#1| 1) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) 0) 0) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_remove_first_~head#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_sll_circular_remove_first_#in~head#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-11-25 00:09:19,366 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:09:19,367 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-25 00:09:19,367 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5] total 11 [2023-11-25 00:09:19,367 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717738197] [2023-11-25 00:09:19,367 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-25 00:09:19,368 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-25 00:09:19,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:09:19,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-25 00:09:19,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=711, Unknown=1, NotChecked=54, Total=870 [2023-11-25 00:09:19,369 INFO L87 Difference]: Start difference. First operand 73 states and 80 transitions. Second operand has 13 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-25 00:09:19,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:09:19,735 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2023-11-25 00:09:19,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-25 00:09:19,738 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 21 [2023-11-25 00:09:19,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:09:19,739 INFO L225 Difference]: With dead ends: 64 [2023-11-25 00:09:19,739 INFO L226 Difference]: Without dead ends: 64 [2023-11-25 00:09:19,740 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 262 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=121, Invalid=812, Unknown=1, NotChecked=58, Total=992 [2023-11-25 00:09:19,741 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 95 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 342 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 60 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-25 00:09:19,741 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [95 Valid, 128 Invalid, 342 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 271 Invalid, 0 Unknown, 60 Unchecked, 0.3s Time] [2023-11-25 00:09:19,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-11-25 00:09:19,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2023-11-25 00:09:19,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 41 states have (on average 1.5853658536585367) internal successors, (65), 60 states have internal predecessors, (65), 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) [2023-11-25 00:09:19,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2023-11-25 00:09:19,745 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 21 [2023-11-25 00:09:19,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:09:19,746 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2023-11-25 00:09:19,746 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-25 00:09:19,746 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2023-11-25 00:09:19,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-25 00:09:19,747 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:09:19,747 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:09:19,760 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-25 00:09:19,948 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-25 00:09:19,948 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:09:19,948 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:09:19,949 INFO L85 PathProgramCache]: Analyzing trace with hash -1013707858, now seen corresponding path program 1 times [2023-11-25 00:09:19,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:09:19,949 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1484171875] [2023-11-25 00:09:19,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:19,949 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:09:19,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:20,167 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-25 00:09:20,168 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:09:20,168 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1484171875] [2023-11-25 00:09:20,169 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1484171875] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:09:20,169 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:09:20,169 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2023-11-25 00:09:20,169 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572234564] [2023-11-25 00:09:20,169 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:09:20,171 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-25 00:09:20,171 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:09:20,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-25 00:09:20,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2023-11-25 00:09:20,172 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand has 10 states, 8 states have (on average 2.0) internal successors, (16), 9 states have internal predecessors, (16), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:09:20,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:09:20,487 INFO L93 Difference]: Finished difference Result 92 states and 100 transitions. [2023-11-25 00:09:20,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-25 00:09:20,487 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.0) internal successors, (16), 9 states have internal predecessors, (16), 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 22 [2023-11-25 00:09:20,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:09:20,488 INFO L225 Difference]: With dead ends: 92 [2023-11-25 00:09:20,488 INFO L226 Difference]: Without dead ends: 92 [2023-11-25 00:09:20,489 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2023-11-25 00:09:20,489 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 58 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 371 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 372 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 371 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-25 00:09:20,490 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 220 Invalid, 372 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 371 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-25 00:09:20,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-11-25 00:09:20,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 65. [2023-11-25 00:09:20,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 61 states have internal predecessors, (67), 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) [2023-11-25 00:09:20,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 71 transitions. [2023-11-25 00:09:20,494 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 71 transitions. Word has length 22 [2023-11-25 00:09:20,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:09:20,495 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 71 transitions. [2023-11-25 00:09:20,495 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.0) internal successors, (16), 9 states have internal predecessors, (16), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:09:20,495 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 71 transitions. [2023-11-25 00:09:20,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-25 00:09:20,496 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:09:20,496 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:09:20,496 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-11-25 00:09:20,497 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:09:20,497 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:09:20,497 INFO L85 PathProgramCache]: Analyzing trace with hash -1013707857, now seen corresponding path program 1 times [2023-11-25 00:09:20,497 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:09:20,498 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1365440973] [2023-11-25 00:09:20,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:20,498 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:09:20,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:20,877 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-25 00:09:20,877 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:09:20,877 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1365440973] [2023-11-25 00:09:20,877 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1365440973] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:09:20,877 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:09:20,877 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2023-11-25 00:09:20,877 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516862407] [2023-11-25 00:09:20,878 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:09:20,878 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-25 00:09:20,878 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:09:20,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-25 00:09:20,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2023-11-25 00:09:20,879 INFO L87 Difference]: Start difference. First operand 65 states and 71 transitions. Second operand has 10 states, 8 states have (on average 2.25) internal successors, (18), 9 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:09:21,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:09:21,195 INFO L93 Difference]: Finished difference Result 93 states and 101 transitions. [2023-11-25 00:09:21,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-25 00:09:21,196 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 9 states have internal predecessors, (18), 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 22 [2023-11-25 00:09:21,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:09:21,197 INFO L225 Difference]: With dead ends: 93 [2023-11-25 00:09:21,197 INFO L226 Difference]: Without dead ends: 93 [2023-11-25 00:09:21,197 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2023-11-25 00:09:21,198 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 58 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 303 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-25 00:09:21,198 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 288 Invalid, 303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 303 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-25 00:09:21,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2023-11-25 00:09:21,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 65. [2023-11-25 00:09:21,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 42 states have (on average 1.5714285714285714) internal successors, (66), 61 states have internal predecessors, (66), 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) [2023-11-25 00:09:21,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 70 transitions. [2023-11-25 00:09:21,202 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 70 transitions. Word has length 22 [2023-11-25 00:09:21,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:09:21,202 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 70 transitions. [2023-11-25 00:09:21,203 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 9 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:09:21,203 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 70 transitions. [2023-11-25 00:09:21,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-25 00:09:21,203 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:09:21,204 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:09:21,204 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-25 00:09:21,204 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr37ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:09:21,204 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:09:21,204 INFO L85 PathProgramCache]: Analyzing trace with hash -1356196272, now seen corresponding path program 1 times [2023-11-25 00:09:21,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:09:21,205 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1553113243] [2023-11-25 00:09:21,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:21,205 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:09:21,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:21,271 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-25 00:09:21,271 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:09:21,271 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1553113243] [2023-11-25 00:09:21,271 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1553113243] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:09:21,272 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:09:21,272 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-25 00:09:21,272 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835194728] [2023-11-25 00:09:21,272 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:09:21,272 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-25 00:09:21,273 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:09:21,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-25 00:09:21,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-25 00:09:21,274 INFO L87 Difference]: Start difference. First operand 65 states and 70 transitions. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:09:21,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:09:21,315 INFO L93 Difference]: Finished difference Result 97 states and 103 transitions. [2023-11-25 00:09:21,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-25 00:09:21,316 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 23 [2023-11-25 00:09:21,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:09:21,317 INFO L225 Difference]: With dead ends: 97 [2023-11-25 00:09:21,317 INFO L226 Difference]: Without dead ends: 97 [2023-11-25 00:09:21,318 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-25 00:09:21,318 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 124 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-25 00:09:21,319 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 100 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-25 00:09:21,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2023-11-25 00:09:21,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 64. [2023-11-25 00:09:21,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 41 states have (on average 1.5609756097560976) internal successors, (64), 60 states have internal predecessors, (64), 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) [2023-11-25 00:09:21,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2023-11-25 00:09:21,322 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 23 [2023-11-25 00:09:21,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:09:21,323 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2023-11-25 00:09:21,323 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:09:21,323 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2023-11-25 00:09:21,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-25 00:09:21,324 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:09:21,324 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:09:21,324 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-11-25 00:09:21,325 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr19REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:09:21,325 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:09:21,325 INFO L85 PathProgramCache]: Analyzing trace with hash -2064174907, now seen corresponding path program 1 times [2023-11-25 00:09:21,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:09:21,326 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300325385] [2023-11-25 00:09:21,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:21,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:09:21,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:21,404 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-25 00:09:21,404 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:09:21,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1300325385] [2023-11-25 00:09:21,404 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1300325385] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:09:21,404 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:09:21,405 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-25 00:09:21,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552896225] [2023-11-25 00:09:21,405 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:09:21,405 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-25 00:09:21,405 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:09:21,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-25 00:09:21,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-25 00:09:21,406 INFO L87 Difference]: Start difference. First operand 64 states and 68 transitions. Second operand has 5 states, 4 states have (on average 4.5) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:09:21,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:09:21,522 INFO L93 Difference]: Finished difference Result 64 states and 68 transitions. [2023-11-25 00:09:21,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-25 00:09:21,522 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.5) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 26 [2023-11-25 00:09:21,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:09:21,523 INFO L225 Difference]: With dead ends: 64 [2023-11-25 00:09:21,523 INFO L226 Difference]: Without dead ends: 64 [2023-11-25 00:09:21,524 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-25 00:09:21,524 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 35 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-25 00:09:21,524 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 91 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-25 00:09:21,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-11-25 00:09:21,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2023-11-25 00:09:21,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 42 states have (on average 1.5238095238095237) internal successors, (64), 59 states have internal predecessors, (64), 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) [2023-11-25 00:09:21,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 68 transitions. [2023-11-25 00:09:21,528 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 68 transitions. Word has length 26 [2023-11-25 00:09:21,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:09:21,528 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 68 transitions. [2023-11-25 00:09:21,528 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.5) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:09:21,528 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 68 transitions. [2023-11-25 00:09:21,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-25 00:09:21,529 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:09:21,529 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:09:21,529 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-11-25 00:09:21,530 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:09:21,530 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:09:21,530 INFO L85 PathProgramCache]: Analyzing trace with hash -2064174906, now seen corresponding path program 1 times [2023-11-25 00:09:21,530 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:09:21,530 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1795385862] [2023-11-25 00:09:21,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:21,531 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:09:21,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:21,947 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-25 00:09:21,947 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:09:21,947 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1795385862] [2023-11-25 00:09:21,948 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1795385862] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:09:21,948 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:09:21,948 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2023-11-25 00:09:21,948 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553144862] [2023-11-25 00:09:21,948 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:09:21,949 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-25 00:09:21,949 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:09:21,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-25 00:09:21,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2023-11-25 00:09:21,950 INFO L87 Difference]: Start difference. First operand 63 states and 68 transitions. Second operand has 11 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 10 states have internal predecessors, (22), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:09:22,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:09:22,301 INFO L93 Difference]: Finished difference Result 99 states and 108 transitions. [2023-11-25 00:09:22,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-25 00:09:22,303 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 10 states have internal predecessors, (22), 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 26 [2023-11-25 00:09:22,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:09:22,304 INFO L225 Difference]: With dead ends: 99 [2023-11-25 00:09:22,304 INFO L226 Difference]: Without dead ends: 99 [2023-11-25 00:09:22,305 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2023-11-25 00:09:22,305 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 68 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-25 00:09:22,306 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 289 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-25 00:09:22,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2023-11-25 00:09:22,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 71. [2023-11-25 00:09:22,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 50 states have (on average 1.48) internal successors, (74), 67 states have internal predecessors, (74), 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) [2023-11-25 00:09:22,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 78 transitions. [2023-11-25 00:09:22,310 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 78 transitions. Word has length 26 [2023-11-25 00:09:22,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:09:22,310 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 78 transitions. [2023-11-25 00:09:22,311 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 10 states have internal predecessors, (22), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:09:22,311 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 78 transitions. [2023-11-25 00:09:22,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-25 00:09:22,312 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:09:22,312 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:09:22,312 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-11-25 00:09:22,312 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:09:22,313 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:09:22,313 INFO L85 PathProgramCache]: Analyzing trace with hash -2064191760, now seen corresponding path program 1 times [2023-11-25 00:09:22,313 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:09:22,313 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794084250] [2023-11-25 00:09:22,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:22,314 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:09:22,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:22,512 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-25 00:09:22,513 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:09:22,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794084250] [2023-11-25 00:09:22,513 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1794084250] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:09:22,513 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:09:22,513 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2023-11-25 00:09:22,514 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602862885] [2023-11-25 00:09:22,514 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:09:22,514 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-25 00:09:22,514 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:09:22,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-25 00:09:22,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2023-11-25 00:09:22,515 INFO L87 Difference]: Start difference. First operand 71 states and 78 transitions. Second operand has 10 states, 8 states have (on average 2.75) internal successors, (22), 9 states have internal predecessors, (22), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:09:22,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:09:22,774 INFO L93 Difference]: Finished difference Result 109 states and 121 transitions. [2023-11-25 00:09:22,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-25 00:09:22,775 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.75) internal successors, (22), 9 states have internal predecessors, (22), 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 26 [2023-11-25 00:09:22,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:09:22,776 INFO L225 Difference]: With dead ends: 109 [2023-11-25 00:09:22,776 INFO L226 Difference]: Without dead ends: 109 [2023-11-25 00:09:22,777 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2023-11-25 00:09:22,777 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 64 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-25 00:09:22,777 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 322 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 261 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-25 00:09:22,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2023-11-25 00:09:22,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 82. [2023-11-25 00:09:22,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 61 states have (on average 1.5245901639344261) internal successors, (93), 78 states have internal predecessors, (93), 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) [2023-11-25 00:09:22,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 97 transitions. [2023-11-25 00:09:22,781 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 97 transitions. Word has length 26 [2023-11-25 00:09:22,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:09:22,781 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 97 transitions. [2023-11-25 00:09:22,782 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.75) internal successors, (22), 9 states have internal predecessors, (22), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:09:22,782 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 97 transitions. [2023-11-25 00:09:22,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-25 00:09:22,782 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:09:22,783 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:09:22,783 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-11-25 00:09:22,783 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:09:22,783 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:09:22,783 INFO L85 PathProgramCache]: Analyzing trace with hash 434564967, now seen corresponding path program 1 times [2023-11-25 00:09:22,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:09:22,783 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1853302334] [2023-11-25 00:09:22,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:22,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:09:22,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:22,987 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-25 00:09:22,988 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:09:22,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1853302334] [2023-11-25 00:09:22,988 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1853302334] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:09:22,988 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:09:22,988 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2023-11-25 00:09:22,989 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724786450] [2023-11-25 00:09:22,989 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:09:22,989 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-25 00:09:22,989 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:09:22,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-25 00:09:22,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2023-11-25 00:09:22,990 INFO L87 Difference]: Start difference. First operand 82 states and 97 transitions. Second operand has 10 states, 8 states have (on average 2.875) internal successors, (23), 9 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:09:23,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:09:23,308 INFO L93 Difference]: Finished difference Result 101 states and 118 transitions. [2023-11-25 00:09:23,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-25 00:09:23,309 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.875) internal successors, (23), 9 states have internal predecessors, (23), 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 27 [2023-11-25 00:09:23,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:09:23,310 INFO L225 Difference]: With dead ends: 101 [2023-11-25 00:09:23,310 INFO L226 Difference]: Without dead ends: 101 [2023-11-25 00:09:23,310 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2023-11-25 00:09:23,311 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 45 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 275 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-25 00:09:23,311 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 275 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-25 00:09:23,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2023-11-25 00:09:23,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 85. [2023-11-25 00:09:23,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 64 states have (on average 1.5) internal successors, (96), 81 states have internal predecessors, (96), 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) [2023-11-25 00:09:23,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 100 transitions. [2023-11-25 00:09:23,315 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 100 transitions. Word has length 27 [2023-11-25 00:09:23,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:09:23,315 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 100 transitions. [2023-11-25 00:09:23,315 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.875) internal successors, (23), 9 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:09:23,315 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 100 transitions. [2023-11-25 00:09:23,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-25 00:09:23,316 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:09:23,316 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:09:23,316 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-11-25 00:09:23,317 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:09:23,317 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:09:23,317 INFO L85 PathProgramCache]: Analyzing trace with hash 586612178, now seen corresponding path program 1 times [2023-11-25 00:09:23,317 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:09:23,318 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1804435289] [2023-11-25 00:09:23,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:23,318 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:09:23,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:23,402 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-25 00:09:23,402 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:09:23,402 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1804435289] [2023-11-25 00:09:23,403 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1804435289] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:09:23,403 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:09:23,403 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-25 00:09:23,403 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122711424] [2023-11-25 00:09:23,403 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:09:23,404 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-25 00:09:23,404 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:09:23,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-25 00:09:23,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-25 00:09:23,405 INFO L87 Difference]: Start difference. First operand 85 states and 100 transitions. Second operand has 5 states, 4 states have (on average 5.0) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:09:23,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:09:23,532 INFO L93 Difference]: Finished difference Result 84 states and 98 transitions. [2023-11-25 00:09:23,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-25 00:09:23,533 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.0) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 28 [2023-11-25 00:09:23,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:09:23,533 INFO L225 Difference]: With dead ends: 84 [2023-11-25 00:09:23,533 INFO L226 Difference]: Without dead ends: 84 [2023-11-25 00:09:23,534 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-25 00:09:23,534 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 20 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-25 00:09:23,535 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 103 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-25 00:09:23,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2023-11-25 00:09:23,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2023-11-25 00:09:23,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 64 states have (on average 1.46875) internal successors, (94), 80 states have internal predecessors, (94), 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) [2023-11-25 00:09:23,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 98 transitions. [2023-11-25 00:09:23,540 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 98 transitions. Word has length 28 [2023-11-25 00:09:23,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:09:23,542 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 98 transitions. [2023-11-25 00:09:23,542 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.0) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:09:23,543 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 98 transitions. [2023-11-25 00:09:23,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-25 00:09:23,546 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:09:23,546 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:09:23,547 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-11-25 00:09:23,547 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:09:23,548 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:09:23,548 INFO L85 PathProgramCache]: Analyzing trace with hash 1005108426, now seen corresponding path program 1 times [2023-11-25 00:09:23,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:09:23,548 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785131352] [2023-11-25 00:09:23,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:23,550 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:09:23,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:23,850 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-25 00:09:23,850 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:09:23,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [785131352] [2023-11-25 00:09:23,851 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [785131352] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:09:23,851 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2139454921] [2023-11-25 00:09:23,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:23,851 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:09:23,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:09:23,853 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:09:23,866 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-25 00:09:24,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:24,023 INFO L262 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-25 00:09:24,026 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:09:24,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:09:24,129 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-25 00:09:24,132 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-25 00:09:24,132 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-25 00:09:24,132 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2139454921] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:09:24,132 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-25 00:09:24,132 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [12] total 15 [2023-11-25 00:09:24,133 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697284455] [2023-11-25 00:09:24,133 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:09:24,133 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-25 00:09:24,133 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:09:24,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-25 00:09:24,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2023-11-25 00:09:24,134 INFO L87 Difference]: Start difference. First operand 84 states and 98 transitions. Second operand has 7 states, 6 states have (on average 3.5) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:09:24,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:09:24,292 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2023-11-25 00:09:24,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-25 00:09:24,292 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.5) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 29 [2023-11-25 00:09:24,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:09:24,293 INFO L225 Difference]: With dead ends: 83 [2023-11-25 00:09:24,293 INFO L226 Difference]: Without dead ends: 83 [2023-11-25 00:09:24,293 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=285, Unknown=0, NotChecked=0, Total=342 [2023-11-25 00:09:24,294 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 93 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-25 00:09:24,294 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [93 Valid, 69 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-25 00:09:24,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2023-11-25 00:09:24,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2023-11-25 00:09:24,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 64 states have (on average 1.4375) internal successors, (92), 79 states have internal predecessors, (92), 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) [2023-11-25 00:09:24,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 96 transitions. [2023-11-25 00:09:24,298 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 96 transitions. Word has length 29 [2023-11-25 00:09:24,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:09:24,298 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 96 transitions. [2023-11-25 00:09:24,298 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.5) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:09:24,299 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 96 transitions. [2023-11-25 00:09:24,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-25 00:09:24,299 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:09:24,299 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:09:24,313 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-25 00:09:24,506 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-11-25 00:09:24,506 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr19REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:09:24,506 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:09:24,507 INFO L85 PathProgramCache]: Analyzing trace with hash -523434381, now seen corresponding path program 1 times [2023-11-25 00:09:24,507 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:09:24,507 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2000878848] [2023-11-25 00:09:24,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:24,507 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:09:24,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:25,092 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:09:25,092 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:09:25,092 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2000878848] [2023-11-25 00:09:25,093 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2000878848] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:09:25,093 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1845805270] [2023-11-25 00:09:25,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:25,093 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:09:25,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:09:25,097 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:09:25,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-25 00:09:25,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:25,286 INFO L262 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 69 conjunts are in the unsatisfiable core [2023-11-25 00:09:25,289 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:09:25,313 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-25 00:09:25,473 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-25 00:09:25,474 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-25 00:09:25,562 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-25 00:09:25,635 INFO L349 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2023-11-25 00:09:25,635 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 54 treesize of output 41 [2023-11-25 00:09:25,782 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-11-25 00:09:25,883 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-25 00:09:25,884 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 20 [2023-11-25 00:09:25,887 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:09:25,887 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:09:25,928 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 24 [2023-11-25 00:09:25,948 INFO L349 Elim1Store]: treesize reduction 5, result has 77.3 percent of original size [2023-11-25 00:09:25,948 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 26 treesize of output 25 [2023-11-25 00:09:25,956 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_930 (Array Int Int)) (|ULTIMATE.start_main_~#s~0#1.base| Int)) (let ((.cse1 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base| v_ArrVal_930))) (let ((.cse0 (select (select .cse1 |ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|))) (or (not (= |c_ULTIMATE.start_sll_circular_create_~head~0#1.base| .cse0)) (= (select (select .cse1 .cse0) |c_ULTIMATE.start_sll_circular_create_~head~0#1.offset|) |c_ULTIMATE.start_sll_circular_create_~last~0#1.base|))))) is different from false [2023-11-25 00:09:25,972 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-25 00:09:25,972 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 53 treesize of output 37 [2023-11-25 00:09:26,033 INFO L349 Elim1Store]: treesize reduction 21, result has 67.2 percent of original size [2023-11-25 00:09:26,033 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 115 treesize of output 131 [2023-11-25 00:09:26,054 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-25 00:09:26,054 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 104 treesize of output 100 [2023-11-25 00:09:26,463 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1845805270] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:09:26,463 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [300690518] [2023-11-25 00:09:26,466 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-25 00:09:26,466 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:09:26,466 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:09:26,467 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:09:26,467 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:09:27,748 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-25 00:09:27,860 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:09:34,329 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3854#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 2 |ULTIMATE.start_sll_circular_remove_first_#in~head#1.base|) (<= 2 |ULTIMATE.start_sll_circular_remove_first_~head#1.base|) (= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (not (= (select |#valid| |ULTIMATE.start_sll_circular_remove_first_~last~1#1.base|) 1)) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_remove_first_~head#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_sll_circular_remove_first_#in~head#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-11-25 00:09:34,329 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:09:34,329 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-25 00:09:34,329 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 27 [2023-11-25 00:09:34,329 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72699115] [2023-11-25 00:09:34,329 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-25 00:09:34,330 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-11-25 00:09:34,330 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:09:34,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-11-25 00:09:34,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=2366, Unknown=4, NotChecked=98, Total=2652 [2023-11-25 00:09:34,332 INFO L87 Difference]: Start difference. First operand 83 states and 96 transitions. Second operand has 28 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 23 states have internal predecessors, (50), 4 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-25 00:09:35,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:09:35,384 INFO L93 Difference]: Finished difference Result 115 states and 134 transitions. [2023-11-25 00:09:35,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-11-25 00:09:35,389 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 23 states have internal predecessors, (50), 4 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 30 [2023-11-25 00:09:35,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:09:35,390 INFO L225 Difference]: With dead ends: 115 [2023-11-25 00:09:35,390 INFO L226 Difference]: Without dead ends: 115 [2023-11-25 00:09:35,391 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 724 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=258, Invalid=3164, Unknown=4, NotChecked=114, Total=3540 [2023-11-25 00:09:35,392 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 128 mSDsluCounter, 427 mSDsCounter, 0 mSdLazyCounter, 843 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 457 SdHoareTripleChecker+Invalid, 850 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 843 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-25 00:09:35,392 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [129 Valid, 457 Invalid, 850 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 843 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-25 00:09:35,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2023-11-25 00:09:35,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 98. [2023-11-25 00:09:35,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 78 states have (on average 1.3974358974358974) internal successors, (109), 93 states have internal predecessors, (109), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-25 00:09:35,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 115 transitions. [2023-11-25 00:09:35,400 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 115 transitions. Word has length 30 [2023-11-25 00:09:35,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:09:35,403 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 115 transitions. [2023-11-25 00:09:35,403 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 23 states have internal predecessors, (50), 4 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-25 00:09:35,403 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 115 transitions. [2023-11-25 00:09:35,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-25 00:09:35,405 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:09:35,405 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:09:35,416 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-25 00:09:35,611 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:09:35,612 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-25 00:09:35,612 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:09:35,612 INFO L85 PathProgramCache]: Analyzing trace with hash -523434380, now seen corresponding path program 1 times [2023-11-25 00:09:35,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:09:35,613 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1467271345] [2023-11-25 00:09:35,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:35,613 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:09:35,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:36,650 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:09:36,650 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:09:36,650 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1467271345] [2023-11-25 00:09:36,650 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1467271345] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:09:36,651 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [789772363] [2023-11-25 00:09:36,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:09:36,651 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:09:36,651 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:09:36,652 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:09:36,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bdb68f1-0908-49db-bd2b-f4c0aaa4bc4e/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-25 00:09:36,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:09:36,827 INFO L262 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 87 conjunts are in the unsatisfiable core [2023-11-25 00:09:36,831 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:09:36,859 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-25 00:09:36,866 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-25 00:09:37,119 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-25 00:09:37,120 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-25 00:09:37,129 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-25 00:09:37,249 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-25 00:09:37,257 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-25 00:09:37,349 INFO L349 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2023-11-25 00:09:37,350 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 78 treesize of output 53 [2023-11-25 00:09:37,360 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 15 [2023-11-25 00:09:37,686 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-25 00:09:37,686 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 52 treesize of output 27 [2023-11-25 00:09:37,696 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-11-25 00:09:37,699 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:09:37,699 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:09:37,980 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((|ULTIMATE.start_main_~#s~0#1.base| Int) (v_ArrVal_1021 (Array Int Int))) (let ((.cse0 (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base| v_ArrVal_1021))) (let ((.cse2 (select (select .cse0 |ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|))) (or (forall ((v_ArrVal_1022 (Array Int Int))) (let ((.cse3 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base| v_ArrVal_1022))) (let ((.cse1 (select (select .cse3 |ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|))) (or (< (+ (select (select .cse0 .cse1) .cse2) 3) (select |c_#length| (select (select .cse3 .cse1) .cse2))) (not (= |c_ULTIMATE.start_sll_circular_create_~head~0#1.base| .cse1)))))) (not (= .cse2 |c_ULTIMATE.start_sll_circular_create_~head~0#1.offset|)))))) (forall ((|ULTIMATE.start_main_~#s~0#1.base| Int) (v_ArrVal_1021 (Array Int Int))) (let ((.cse5 (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base| v_ArrVal_1021))) (let ((.cse6 (select (select .cse5 |ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|))) (or (forall ((v_ArrVal_1022 (Array Int Int))) (let ((.cse4 (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base| v_ArrVal_1022) |ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|))) (or (not (= |c_ULTIMATE.start_sll_circular_create_~head~0#1.base| .cse4)) (< 0 (+ (select (select .cse5 .cse4) .cse6) 1))))) (not (= .cse6 |c_ULTIMATE.start_sll_circular_create_~head~0#1.offset|))))))) is different from false [2023-11-25 00:09:38,035 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-25 00:09:38,035 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 117 treesize of output 93 [2023-11-25 00:09:38,046 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-25 00:09:38,046 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 93 treesize of output 69 [2023-11-25 00:09:38,113 INFO L349 Elim1Store]: treesize reduction 21, result has 73.1 percent of original size [2023-11-25 00:09:38,116 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 216 treesize of output 224 [2023-11-25 00:09:38,322 INFO L349 Elim1Store]: treesize reduction 67, result has 64.0 percent of original size [2023-11-25 00:09:38,323 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 520 treesize of output 530 [2023-11-25 00:09:38,384 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-25 00:09:38,385 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 195 treesize of output 197 [2023-11-25 00:09:38,424 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-25 00:09:38,425 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 215 treesize of output 217