./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff 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_d02a1b54-3645-4899-92c7-a4137a575ad2/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d02a1b54-3645-4899-92c7-a4137a575ad2/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d02a1b54-3645-4899-92c7-a4137a575ad2/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d02a1b54-3645-4899-92c7-a4137a575ad2/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d02a1b54-3645-4899-92c7-a4137a575ad2/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d02a1b54-3645-4899-92c7-a4137a575ad2/bin/utaipan-verify-t7M7D8N6sZ --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash f8d14145608efc0a8f321a178564faff63399ecbab28641c0c2971fec318068f --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:07:03,877 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:07:04,012 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d02a1b54-3645-4899-92c7-a4137a575ad2/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:07:04,023 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:07:04,024 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:07:04,062 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:07:04,063 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:07:04,064 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:07:04,065 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:07:04,065 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:07:04,066 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:07:04,067 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:07:04,068 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:07:04,068 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:07:04,069 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:07:04,070 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:07:04,070 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:07:04,071 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:07:04,072 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:07:04,072 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:07:04,073 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:07:04,074 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:07:04,075 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:07:04,076 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:07:04,077 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:07:04,077 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:07:04,078 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:07:04,078 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:07:04,079 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:07:04,080 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:07:04,080 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:07:04,081 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:07:04,081 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:07:04,082 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:07:04,082 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:07:04,083 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:07:04,083 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:07:04,084 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:07:04,085 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:07:04,085 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:07:04,086 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:07:04,086 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:07:04,087 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:07:04,087 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:07:04,088 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:07:04,088 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_d02a1b54-3645-4899-92c7-a4137a575ad2/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d02a1b54-3645-4899-92c7-a4137a575ad2/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f8d14145608efc0a8f321a178564faff63399ecbab28641c0c2971fec318068f [2023-11-19 05:07:04,412 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:07:04,439 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:07:04,443 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:07:04,444 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:07:04,445 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:07:04,447 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d02a1b54-3645-4899-92c7-a4137a575ad2/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i [2023-11-19 05:07:07,626 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:07:07,985 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:07:07,990 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d02a1b54-3645-4899-92c7-a4137a575ad2/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i [2023-11-19 05:07:08,016 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d02a1b54-3645-4899-92c7-a4137a575ad2/bin/utaipan-verify-t7M7D8N6sZ/data/cb7f245dd/ff01bc1a940349b09bd9bd8620578613/FLAGb2901fb33 [2023-11-19 05:07:08,033 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d02a1b54-3645-4899-92c7-a4137a575ad2/bin/utaipan-verify-t7M7D8N6sZ/data/cb7f245dd/ff01bc1a940349b09bd9bd8620578613 [2023-11-19 05:07:08,039 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:07:08,041 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:07:08,042 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:07:08,043 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:07:08,049 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:07:08,050 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:07:08" (1/1) ... [2023-11-19 05:07:08,051 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5fa9b545 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:07:08, skipping insertion in model container [2023-11-19 05:07:08,051 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:07:08" (1/1) ... [2023-11-19 05:07:08,122 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:07:08,448 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d02a1b54-3645-4899-92c7-a4137a575ad2/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i[22636,22649] [2023-11-19 05:07:08,499 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:07:08,512 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:07:08,555 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d02a1b54-3645-4899-92c7-a4137a575ad2/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i[22636,22649] [2023-11-19 05:07:08,570 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:07:08,605 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:07:08,606 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:07:08 WrapperNode [2023-11-19 05:07:08,606 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:07:08,607 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:07:08,608 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:07:08,608 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:07:08,616 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:07:08" (1/1) ... [2023-11-19 05:07:08,636 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:07:08" (1/1) ... [2023-11-19 05:07:08,665 INFO L138 Inliner]: procedures = 129, calls = 79, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 206 [2023-11-19 05:07:08,666 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:07:08,666 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:07:08,667 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:07:08,667 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:07:08,677 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:07:08" (1/1) ... [2023-11-19 05:07:08,677 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:07:08" (1/1) ... [2023-11-19 05:07:08,683 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:07:08" (1/1) ... [2023-11-19 05:07:08,684 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:07:08" (1/1) ... [2023-11-19 05:07:08,696 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:07:08" (1/1) ... [2023-11-19 05:07:08,704 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:07:08" (1/1) ... [2023-11-19 05:07:08,707 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:07:08" (1/1) ... [2023-11-19 05:07:08,710 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:07:08" (1/1) ... [2023-11-19 05:07:08,715 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:07:08,716 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:07:08,716 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:07:08,717 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:07:08,718 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:07:08" (1/1) ... [2023-11-19 05:07:08,724 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:07:08,740 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d02a1b54-3645-4899-92c7-a4137a575ad2/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:07:08,753 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d02a1b54-3645-4899-92c7-a4137a575ad2/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:07:08,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d02a1b54-3645-4899-92c7-a4137a575ad2/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:07:08,805 INFO L130 BoogieDeclarations]: Found specification of procedure fail [2023-11-19 05:07:08,805 INFO L138 BoogieDeclarations]: Found implementation of procedure fail [2023-11-19 05:07:08,805 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-19 05:07:08,806 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:07:08,806 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 05:07:08,806 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-19 05:07:08,806 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-19 05:07:08,807 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_prev [2023-11-19 05:07:08,807 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_prev [2023-11-19 05:07:08,807 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 05:07:08,807 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-19 05:07:08,807 INFO L130 BoogieDeclarations]: Found specification of procedure chain_node [2023-11-19 05:07:08,808 INFO L138 BoogieDeclarations]: Found implementation of procedure chain_node [2023-11-19 05:07:08,808 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:07:08,808 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_next [2023-11-19 05:07:08,808 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_next [2023-11-19 05:07:08,808 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:07:08,809 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:07:09,005 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:07:09,009 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:07:09,428 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:07:09,542 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:07:09,542 INFO L302 CfgBuilder]: Removed 33 assume(true) statements. [2023-11-19 05:07:09,548 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:07:09 BoogieIcfgContainer [2023-11-19 05:07:09,549 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:07:09,552 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:07:09,552 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:07:09,556 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:07:09,556 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:07:08" (1/3) ... [2023-11-19 05:07:09,557 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58c718ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:07:09, skipping insertion in model container [2023-11-19 05:07:09,557 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:07:08" (2/3) ... [2023-11-19 05:07:09,558 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58c718ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:07:09, skipping insertion in model container [2023-11-19 05:07:09,580 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:07:09" (3/3) ... [2023-11-19 05:07:09,582 INFO L112 eAbstractionObserver]: Analyzing ICFG sll_to_dll_rev-1.i [2023-11-19 05:07:09,598 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:07:09,598 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:07:09,666 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:07:09,674 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=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, 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;@759847c1, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:07:09,674 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:07:09,679 INFO L276 IsEmpty]: Start isEmpty. Operand has 78 states, 57 states have (on average 1.7017543859649122) internal successors, (97), 65 states have internal predecessors, (97), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2023-11-19 05:07:09,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-19 05:07:09,687 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:07:09,688 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:07:09,689 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting failErr0ASSERT_VIOLATIONERROR_FUNCTION === [failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:07:09,694 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:07:09,695 INFO L85 PathProgramCache]: Analyzing trace with hash 715545047, now seen corresponding path program 1 times [2023-11-19 05:07:09,705 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:07:09,706 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773230447] [2023-11-19 05:07:09,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:07:09,707 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:07:09,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:07:09,941 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:07:09,941 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:07:09,941 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773230447] [2023-11-19 05:07:09,942 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1773230447] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:07:09,942 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:07:09,942 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:07:09,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475779430] [2023-11-19 05:07:09,944 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:07:09,948 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-19 05:07:09,948 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:07:09,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-19 05:07:09,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 05:07:09,991 INFO L87 Difference]: Start difference. First operand has 78 states, 57 states have (on average 1.7017543859649122) internal successors, (97), 65 states have internal predecessors, (97), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:07:10,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:07:10,092 INFO L93 Difference]: Finished difference Result 151 states and 261 transitions. [2023-11-19 05:07:10,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-19 05:07:10,095 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-19 05:07:10,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:07:10,103 INFO L225 Difference]: With dead ends: 151 [2023-11-19 05:07:10,104 INFO L226 Difference]: Without dead ends: 74 [2023-11-19 05:07:10,108 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 05:07:10,112 INFO L413 NwaCegarLoop]: 86 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:07:10,114 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 86 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:07:10,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2023-11-19 05:07:10,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2023-11-19 05:07:10,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 53 states have (on average 1.3018867924528301) internal successors, (69), 62 states have internal predecessors, (69), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-19 05:07:10,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 94 transitions. [2023-11-19 05:07:10,166 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 94 transitions. Word has length 13 [2023-11-19 05:07:10,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:07:10,167 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 94 transitions. [2023-11-19 05:07:10,167 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:07:10,167 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 94 transitions. [2023-11-19 05:07:10,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-19 05:07:10,169 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:07:10,169 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:07:10,170 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:07:10,170 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting failErr0ASSERT_VIOLATIONERROR_FUNCTION === [failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:07:10,171 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:07:10,171 INFO L85 PathProgramCache]: Analyzing trace with hash -272638292, now seen corresponding path program 1 times [2023-11-19 05:07:10,171 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:07:10,172 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766828363] [2023-11-19 05:07:10,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:07:10,172 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:07:10,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:07:12,271 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:07:12,272 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:07:12,272 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766828363] [2023-11-19 05:07:12,273 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766828363] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:07:12,273 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1136150082] [2023-11-19 05:07:12,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:07:12,274 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:07:12,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d02a1b54-3645-4899-92c7-a4137a575ad2/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:07:12,279 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d02a1b54-3645-4899-92c7-a4137a575ad2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:07:12,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d02a1b54-3645-4899-92c7-a4137a575ad2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:07:12,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:07:12,521 INFO L262 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 55 conjunts are in the unsatisfiable core [2023-11-19 05:07:12,533 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:07:12,600 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 14 treesize of output 12 [2023-11-19 05:07:12,681 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 40 [2023-11-19 05:07:12,694 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 64 treesize of output 29 [2023-11-19 05:07:12,699 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 1 [2023-11-19 05:07:12,766 INFO L349 Elim1Store]: treesize reduction 72, result has 32.7 percent of original size [2023-11-19 05:07:12,766 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2023-11-19 05:07:12,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:07:12,883 INFO L349 Elim1Store]: treesize reduction 54, result has 1.8 percent of original size [2023-11-19 05:07:12,883 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 1 [2023-11-19 05:07:13,046 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 12 [2023-11-19 05:07:13,161 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 24 treesize of output 19 [2023-11-19 05:07:13,230 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 8 [2023-11-19 05:07:13,390 INFO L349 Elim1Store]: treesize reduction 38, result has 15.6 percent of original size [2023-11-19 05:07:13,390 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 54 treesize of output 72 [2023-11-19 05:07:13,414 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 9 treesize of output 7 [2023-11-19 05:07:13,530 INFO L349 Elim1Store]: treesize reduction 20, result has 4.8 percent of original size [2023-11-19 05:07:13,531 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 28 treesize of output 11 [2023-11-19 05:07:13,611 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 16 treesize of output 8 [2023-11-19 05:07:13,618 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:07:13,618 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:07:13,822 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1136150082] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:07:13,823 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1099494568] [2023-11-19 05:07:13,845 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-11-19 05:07:13,846 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:07:13,850 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:07:13,857 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:07:13,857 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:07:21,859 INFO L197 IcfgInterpreter]: Interpreting procedure chain_node with input of size 263 for LOIs [2023-11-19 05:07:22,172 INFO L197 IcfgInterpreter]: Interpreting procedure check_seq_next with input of size 304 for LOIs [2023-11-19 05:07:24,961 INFO L197 IcfgInterpreter]: Interpreting procedure fail with input of size 294 for LOIs [2023-11-19 05:07:26,031 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:08:00,722 WARN L293 SmtUtils]: Spent 26.81s on a formula simplification. DAG size of input: 294 DAG size of output: 287 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)