./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-simple/sll2c_remove_all.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability 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_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/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_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-simple/sll2c_remove_all.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91 --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 cd9bd7b6c1446abd728b90c98a54cb367face4c5994cfeca4979c2dbc50ad4d3 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-24 23:20:57,024 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-24 23:20:57,161 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-24 23:20:57,171 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-24 23:20:57,172 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-24 23:20:57,229 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-24 23:20:57,230 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-24 23:20:57,231 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-24 23:20:57,232 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-24 23:20:57,238 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-24 23:20:57,238 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-24 23:20:57,239 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-24 23:20:57,240 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-24 23:20:57,242 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-24 23:20:57,242 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-24 23:20:57,243 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-24 23:20:57,243 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-24 23:20:57,244 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-24 23:20:57,246 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-24 23:20:57,247 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-24 23:20:57,248 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-24 23:20:57,248 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-24 23:20:57,249 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-24 23:20:57,249 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-24 23:20:57,250 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-24 23:20:57,250 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-24 23:20:57,251 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-24 23:20:57,251 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-24 23:20:57,252 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-24 23:20:57,252 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-24 23:20:57,252 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-24 23:20:57,253 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-24 23:20:57,253 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-24 23:20:57,253 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-24 23:20:57,254 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-24 23:20:57,254 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-24 23:20:57,267 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-24 23:20:57,268 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:20:57,268 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-24 23:20:57,268 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-24 23:20:57,269 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-24 23:20:57,269 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-24 23:20:57,269 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-24 23:20:57,269 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-24 23:20:57,270 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-24 23:20:57,270 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-24 23:20:57,270 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-24 23:20:57,270 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_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cd9bd7b6c1446abd728b90c98a54cb367face4c5994cfeca4979c2dbc50ad4d3 [2023-11-24 23:20:57,536 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-24 23:20:57,586 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-24 23:20:57,589 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-24 23:20:57,592 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-24 23:20:57,592 INFO L274 PluginConnector]: CDTParser initialized [2023-11-24 23:20:57,594 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/list-simple/sll2c_remove_all.i [2023-11-24 23:21:00,845 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-24 23:21:01,223 INFO L384 CDTParser]: Found 1 translation units. [2023-11-24 23:21:01,224 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/sv-benchmarks/c/list-simple/sll2c_remove_all.i [2023-11-24 23:21:01,253 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/data/3c2a2ecd4/84e03efc3f7345259843ef670b84d881/FLAG7873caeb1 [2023-11-24 23:21:01,273 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/data/3c2a2ecd4/84e03efc3f7345259843ef670b84d881 [2023-11-24 23:21:01,281 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-24 23:21:01,284 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-24 23:21:01,288 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-24 23:21:01,288 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-24 23:21:01,295 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-24 23:21:01,296 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:21:01" (1/1) ... [2023-11-24 23:21:01,298 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@684e970e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:21:01, skipping insertion in model container [2023-11-24 23:21:01,298 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:21:01" (1/1) ... [2023-11-24 23:21:01,380 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-24 23:21:01,896 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_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/sv-benchmarks/c/list-simple/sll2c_remove_all.i[24082,24095] [2023-11-24 23:21:01,901 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:21:01,915 INFO L202 MainTranslator]: Completed pre-run [2023-11-24 23:21:01,991 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_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/sv-benchmarks/c/list-simple/sll2c_remove_all.i[24082,24095] [2023-11-24 23:21:01,992 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:21:02,030 INFO L206 MainTranslator]: Completed translation [2023-11-24 23:21:02,031 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:21:02 WrapperNode [2023-11-24 23:21:02,031 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-24 23:21:02,032 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-24 23:21:02,033 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-24 23:21:02,033 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-24 23:21:02,042 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:21:02" (1/1) ... [2023-11-24 23:21:02,061 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:21:02" (1/1) ... [2023-11-24 23:21:02,095 INFO L138 Inliner]: procedures = 126, calls = 36, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 112 [2023-11-24 23:21:02,098 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-24 23:21:02,099 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-24 23:21:02,099 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-24 23:21:02,099 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-24 23:21:02,111 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:21:02" (1/1) ... [2023-11-24 23:21:02,111 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:21:02" (1/1) ... [2023-11-24 23:21:02,117 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:21:02" (1/1) ... [2023-11-24 23:21:02,117 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:21:02" (1/1) ... [2023-11-24 23:21:02,127 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:21:02" (1/1) ... [2023-11-24 23:21:02,132 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:21:02" (1/1) ... [2023-11-24 23:21:02,136 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:21:02" (1/1) ... [2023-11-24 23:21:02,138 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:21:02" (1/1) ... [2023-11-24 23:21:02,142 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-24 23:21:02,143 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-24 23:21:02,144 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-24 23:21:02,144 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-24 23:21:02,145 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:21:02" (1/1) ... [2023-11-24 23:21:02,153 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:21:02,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:21:02,198 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-24 23:21:02,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-24 23:21:02,244 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-24 23:21:02,245 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-24 23:21:02,245 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-24 23:21:02,245 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-24 23:21:02,245 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-24 23:21:02,246 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-24 23:21:02,246 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-24 23:21:02,246 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-24 23:21:02,246 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-24 23:21:02,246 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-24 23:21:02,246 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-24 23:21:02,247 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-24 23:21:02,247 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-24 23:21:02,403 INFO L241 CfgBuilder]: Building ICFG [2023-11-24 23:21:02,406 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-24 23:21:02,783 INFO L282 CfgBuilder]: Performing block encoding [2023-11-24 23:21:02,850 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-24 23:21:02,852 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-24 23:21:02,854 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:21:02 BoogieIcfgContainer [2023-11-24 23:21:02,854 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-24 23:21:02,858 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-24 23:21:02,859 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-24 23:21:02,864 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-24 23:21:02,864 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 11:21:01" (1/3) ... [2023-11-24 23:21:02,865 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22f5fd71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:21:02, skipping insertion in model container [2023-11-24 23:21:02,866 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:21:02" (2/3) ... [2023-11-24 23:21:02,869 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22f5fd71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:21:02, skipping insertion in model container [2023-11-24 23:21:02,869 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:21:02" (3/3) ... [2023-11-24 23:21:02,871 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2c_remove_all.i [2023-11-24 23:21:02,897 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-24 23:21:02,897 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-24 23:21:02,971 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-24 23:21:02,978 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;@13671140, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-24 23:21:02,978 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-24 23:21:02,983 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:21:02,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-24 23:21:02,997 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:21:02,998 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:21:02,998 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:21:03,014 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:21:03,014 INFO L85 PathProgramCache]: Analyzing trace with hash 1913014886, now seen corresponding path program 1 times [2023-11-24 23:21:03,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:21:03,028 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1430403648] [2023-11-24 23:21:03,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:21:03,029 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:21:03,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:21:03,492 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:21:03,492 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:21:03,493 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1430403648] [2023-11-24 23:21:03,494 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1430403648] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:21:03,494 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:21:03,495 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-24 23:21:03,497 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749882793] [2023-11-24 23:21:03,498 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:21:03,503 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:21:03,504 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:21:03,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:21:03,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:21:03,542 INFO L87 Difference]: Start difference. First operand has 21 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 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, 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) [2023-11-24 23:21:03,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:21:03,598 INFO L93 Difference]: Finished difference Result 35 states and 48 transitions. [2023-11-24 23:21:03,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:21:03,601 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 [2023-11-24 23:21:03,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:21:03,610 INFO L225 Difference]: With dead ends: 35 [2023-11-24 23:21:03,611 INFO L226 Difference]: Without dead ends: 21 [2023-11-24 23:21:03,614 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:21:03,619 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 1 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:21:03,620 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 36 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:21:03,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-24 23:21:03,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2023-11-24 23:21:03,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:21:03,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2023-11-24 23:21:03,683 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 10 [2023-11-24 23:21:03,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:21:03,684 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2023-11-24 23:21:03,685 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) [2023-11-24 23:21:03,685 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2023-11-24 23:21:03,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-24 23:21:03,688 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:21:03,688 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:21:03,689 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-24 23:21:03,690 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:21:03,691 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:21:03,692 INFO L85 PathProgramCache]: Analyzing trace with hash 31338330, now seen corresponding path program 1 times [2023-11-24 23:21:03,692 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:21:03,692 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [750194751] [2023-11-24 23:21:03,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:21:03,693 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:21:03,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:21:03,894 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:21:03,895 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:21:03,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [750194751] [2023-11-24 23:21:03,895 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [750194751] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:21:03,896 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:21:03,896 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-24 23:21:03,896 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313536541] [2023-11-24 23:21:03,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:21:03,898 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-24 23:21:03,898 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:21:03,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-24 23:21:03,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-24 23:21:03,900 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 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) [2023-11-24 23:21:03,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:21:03,944 INFO L93 Difference]: Finished difference Result 28 states and 34 transitions. [2023-11-24 23:21:03,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-24 23:21:03,945 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 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 16 [2023-11-24 23:21:03,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:21:03,946 INFO L225 Difference]: With dead ends: 28 [2023-11-24 23:21:03,947 INFO L226 Difference]: Without dead ends: 25 [2023-11-24 23:21:03,947 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 [2023-11-24 23:21:03,950 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 19 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:21:03,951 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 33 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:21:03,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-11-24 23:21:03,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 20. [2023-11-24 23:21:03,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:21:03,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2023-11-24 23:21:03,960 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 16 [2023-11-24 23:21:03,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:21:03,960 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2023-11-24 23:21:03,961 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 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) [2023-11-24 23:21:03,961 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2023-11-24 23:21:03,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-24 23:21:03,966 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:21:03,966 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:21:03,967 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-24 23:21:03,967 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:21:03,968 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:21:03,974 INFO L85 PathProgramCache]: Analyzing trace with hash -91534258, now seen corresponding path program 1 times [2023-11-24 23:21:03,975 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:21:03,975 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461804759] [2023-11-24 23:21:03,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:21:03,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:21:04,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:21:04,315 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:21:04,316 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:21:04,316 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461804759] [2023-11-24 23:21:04,317 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1461804759] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:21:04,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1052190845] [2023-11-24 23:21:04,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:21:04,319 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:21:04,319 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:21:04,328 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:21:04,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-24 23:21:04,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:21:04,559 INFO L262 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-24 23:21:04,568 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:21:04,695 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:21:04,695 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:21:04,782 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:21:04,782 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1052190845] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:21:04,787 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [615263551] [2023-11-24 23:21:04,815 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-24 23:21:04,815 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:21:04,827 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:21:04,833 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:21:04,834 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:21:07,362 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-24 23:21:07,449 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:21:16,600 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [615263551] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:21:16,601 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:21:16,601 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [5, 5, 5] total 22 [2023-11-24 23:21:16,601 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014092653] [2023-11-24 23:21:16,602 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:21:16,602 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-24 23:21:16,603 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:21:16,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-24 23:21:16,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=373, Unknown=1, NotChecked=0, Total=462 [2023-11-24 23:21:16,605 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 14 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:21:18,840 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-24 23:21:21,294 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-24 23:21:29,806 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-24 23:21:33,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:21:33,000 INFO L93 Difference]: Finished difference Result 29 states and 35 transitions. [2023-11-24 23:21:33,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-24 23:21:33,001 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 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) Word has length 19 [2023-11-24 23:21:33,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:21:33,002 INFO L225 Difference]: With dead ends: 29 [2023-11-24 23:21:33,003 INFO L226 Difference]: Without dead ends: 26 [2023-11-24 23:21:33,003 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=97, Invalid=407, Unknown=2, NotChecked=0, Total=506 [2023-11-24 23:21:33,005 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 5 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 1 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.9s IncrementalHoareTripleChecker+Time [2023-11-24 23:21:33,005 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 37 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 214 Invalid, 3 Unknown, 0 Unchecked, 10.9s Time] [2023-11-24 23:21:33,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-24 23:21:33,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 22. [2023-11-24 23:21:33,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:21:33,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2023-11-24 23:21:33,020 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 19 [2023-11-24 23:21:33,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:21:33,020 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2023-11-24 23:21:33,021 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:21:33,021 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2023-11-24 23:21:33,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-24 23:21:33,022 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:21:33,022 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:21:33,036 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-24 23:21:33,235 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:21:33,236 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:21:33,236 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:21:33,236 INFO L85 PathProgramCache]: Analyzing trace with hash 1423302896, now seen corresponding path program 1 times [2023-11-24 23:21:33,236 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:21:33,236 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1703833976] [2023-11-24 23:21:33,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:21:33,237 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:21:33,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:21:33,427 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:21:33,428 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:21:33,430 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1703833976] [2023-11-24 23:21:33,434 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1703833976] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:21:33,434 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [555814729] [2023-11-24 23:21:33,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:21:33,434 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:21:33,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:21:33,436 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:21:33,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-24 23:21:33,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:21:33,571 INFO L262 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-24 23:21:33,573 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:21:33,640 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:21:33,640 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:21:33,696 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:21:33,696 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [555814729] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:21:33,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1232440208] [2023-11-24 23:21:33,699 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-24 23:21:33,700 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:21:33,704 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:21:33,705 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:21:33,705 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:21:34,660 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-24 23:21:34,735 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:21:36,479 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1232440208] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:21:36,480 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:21:36,480 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [5, 5, 5] total 22 [2023-11-24 23:21:36,480 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37833482] [2023-11-24 23:21:36,480 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:21:36,481 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-24 23:21:36,481 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:21:36,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-24 23:21:36,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=352, Unknown=1, NotChecked=0, Total=462 [2023-11-24 23:21:36,482 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 14 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 10 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:21:37,663 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-24 23:21:38,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:21:38,290 INFO L93 Difference]: Finished difference Result 38 states and 48 transitions. [2023-11-24 23:21:38,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-24 23:21:38,291 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 10 states have internal predecessors, (16), 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) Word has length 22 [2023-11-24 23:21:38,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:21:38,292 INFO L225 Difference]: With dead ends: 38 [2023-11-24 23:21:38,292 INFO L226 Difference]: Without dead ends: 29 [2023-11-24 23:21:38,293 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=109, Invalid=352, Unknown=1, NotChecked=0, Total=462 [2023-11-24 23:21:38,294 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 4 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 1 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-11-24 23:21:38,294 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 43 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 190 Invalid, 5 Unknown, 0 Unchecked, 1.8s Time] [2023-11-24 23:21:38,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-11-24 23:21:38,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2023-11-24 23:21:38,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 22 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:21:38,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2023-11-24 23:21:38,307 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 22 [2023-11-24 23:21:38,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:21:38,307 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2023-11-24 23:21:38,307 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 10 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:21:38,307 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2023-11-24 23:21:38,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-24 23:21:38,308 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:21:38,308 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:21:38,319 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-24 23:21:38,514 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:21:38,515 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:21:38,515 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:21:38,515 INFO L85 PathProgramCache]: Analyzing trace with hash 1522305547, now seen corresponding path program 1 times [2023-11-24 23:21:38,515 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:21:38,515 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1314473839] [2023-11-24 23:21:38,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:21:38,515 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:21:38,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:21:38,665 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-24 23:21:38,665 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:21:38,666 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1314473839] [2023-11-24 23:21:38,666 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1314473839] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:21:38,666 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [34381327] [2023-11-24 23:21:38,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:21:38,666 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:21:38,667 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:21:38,669 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:21:38,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-24 23:21:38,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:21:38,818 INFO L262 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-24 23:21:38,821 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:21:38,892 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-24 23:21:38,892 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:21:38,949 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-24 23:21:38,950 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [34381327] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:21:38,950 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [289685598] [2023-11-24 23:21:38,955 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-24 23:21:38,956 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:21:38,956 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:21:38,956 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:21:38,956 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:21:40,728 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-24 23:21:40,778 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:21:41,557 WARN L876 $PredicateComparison]: unable to prove that (and (= |c_ULTIMATE.start_sll_circular_create_~data#1| 1) (= |c_ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 1 |c_#StackHeapBarrier|) (= |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.offset| 0) (= |c_ULTIMATE.start_main_~data~0#1| 1) (= 2 |c_ULTIMATE.start_sll_circular_create_#in~len#1|) (= |c_ULTIMATE.start_sll_circular_create_#in~data#1| 1) (<= 2 |c_ULTIMATE.start_main_~#s~0#1.base|) (= |c_ULTIMATE.start_sll_circular_create_~len#1| 2) (let ((.cse0 (exists ((|v_#valid_59| (Array Int Int))) (and (= (select |v_#valid_59| 0) 0) (= (select |v_#valid_59| 1) 1) (= (select |v_#valid_59| |c_ULTIMATE.start_main_~#s~0#1.base|) 0) (= (select |v_#valid_59| 2) 1)))) (.cse1 (exists ((|v_#length_44| (Array Int Int))) (and (= 2 (select |v_#length_44| 1)) (= 19 (select |v_#length_44| 2))))) (.cse2 (<= (+ |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base| 1) |c_#StackHeapBarrier|)) (.cse3 (exists ((|v_#memory_int_108| (Array Int (Array Int Int))) (|v_#memory_int_34| (Array Int (Array Int Int)))) (let ((.cse12 (select |v_#memory_int_34| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base|))) (and (= (store |v_#memory_int_34| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base| (store .cse12 4 1)) |c_#memory_int|) (= (store |v_#memory_int_108| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base| (store (select |v_#memory_int_108| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base|) 0 (select .cse12 0))) |v_#memory_int_34|))))) (.cse4 (exists ((|v_#valid_60| (Array Int Int))) (and (= (select |v_#valid_60| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base|) 0) (= |c_#valid| (store |v_#valid_60| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base| 1))))) (.cse6 (not (= |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base| 0))) (.cse7 (exists ((|v_#length_45| (Array Int Int))) (= (store |v_#length_45| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base| 8) |c_#length|))) (.cse8 (exists ((|v_#memory_$Pointer$.offset_88| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.offset_88| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base| (store (store (select |v_#memory_$Pointer$.offset_88| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base|) 0 0) 4 (select (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base|) 4))) |c_#memory_$Pointer$.offset|))) (.cse9 (<= (+ |c_#StackHeapBarrier| 1) |c_ULTIMATE.start_main_~#s~0#1.base|)) (.cse10 (exists ((|v_#memory_$Pointer$.base_88| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_88| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base| (store (store (select |v_#memory_$Pointer$.base_88| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base|) 0 0) 4 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_circular_create_#t~ret4#1.base|) 4))) |c_#memory_$Pointer$.base|)))) (or (and .cse0 .cse1 .cse2 .cse3 .cse4 (exists ((|v_#memory_int_BEFORE_CALL_40| (Array Int (Array Int Int)))) (let ((.cse5 (select |v_#memory_int_BEFORE_CALL_40| 1))) (and (= (select .cse5 1) 0) (= 48 (select .cse5 0))))) .cse6 .cse7 .cse8 .cse9 .cse10) (and .cse0 .cse1 .cse2 .cse3 .cse4 .cse6 (exists ((|v_#memory_int_BEFORE_CALL_38| (Array Int (Array Int Int)))) (let ((.cse11 (select |v_#memory_int_BEFORE_CALL_38| 1))) (and (= (select .cse11 1) 0) (= (select .cse11 0) 48)))) .cse7 .cse8 .cse9 .cse10))) (= |c_ULTIMATE.start_main_~len~0#1| 2)) is different from true [2023-11-24 23:21:53,876 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '751#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (exists ((|v_ULTIMATE.start_sll_circular_remove_first_~head#1.base_20| Int) (|v_ULTIMATE.start_sll_circular_remove_first_~temp~1#1.offset_19| Int) (|v_ULTIMATE.start_sll_circular_remove_first_~temp~1#1.base_19| Int)) (and (= 2 |ULTIMATE.start_main_~i~0#1|) (<= 2 |v_ULTIMATE.start_sll_circular_remove_first_~head#1.base_20|) (exists ((|v_#memory_$Pointer$.base_93| (Array Int (Array Int Int))) (|v_#valid_62| (Array Int Int)) (|v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.offset_24| Int) (|v_#memory_int_15| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.base_24| Int) (|v_#memory_int_113| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_93| (Array Int (Array Int Int)))) (and (= |#memory_$Pointer$.offset| (store (store |v_#memory_$Pointer$.offset_93| |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.base_24| (store (select |v_#memory_$Pointer$.offset_93| |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.base_24|) |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.offset_24| |v_ULTIMATE.start_sll_circular_remove_first_~temp~1#1.offset_19|)) |v_ULTIMATE.start_sll_circular_remove_first_~head#1.base_20| (store (select (store |v_#memory_$Pointer$.offset_93| |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.base_24| (store (select |v_#memory_$Pointer$.offset_93| |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.base_24|) |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.offset_24| |v_ULTIMATE.start_sll_circular_remove_first_~temp~1#1.offset_19|)) |v_ULTIMATE.start_sll_circular_remove_first_~head#1.base_20|) 0 |v_ULTIMATE.start_sll_circular_remove_first_~temp~1#1.offset_19|))) (= (store |v_#memory_int_113| |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.base_24| (store (select |v_#memory_int_113| |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.base_24|) |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.offset_24| (select (select |v_#memory_int_15| |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.base_24|) |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.offset_24|))) |v_#memory_int_15|) (= (store (store |v_#memory_$Pointer$.base_93| |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.base_24| (store (select |v_#memory_$Pointer$.base_93| |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.base_24|) |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.offset_24| |v_ULTIMATE.start_sll_circular_remove_first_~temp~1#1.base_19|)) |v_ULTIMATE.start_sll_circular_remove_first_~head#1.base_20| (store (select (store |v_#memory_$Pointer$.base_93| |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.base_24| (store (select |v_#memory_$Pointer$.base_93| |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.base_24|) |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.offset_24| |v_ULTIMATE.start_sll_circular_remove_first_~temp~1#1.base_19|)) |v_ULTIMATE.start_sll_circular_remove_first_~head#1.base_20|) 0 |v_ULTIMATE.start_sll_circular_remove_first_~temp~1#1.base_19|)) |#memory_$Pointer$.base|) (= |#memory_int| (store |v_#memory_int_15| |v_ULTIMATE.start_sll_circular_remove_first_~head#1.base_20| (store (select |v_#memory_int_15| |v_ULTIMATE.start_sll_circular_remove_first_~head#1.base_20|) 0 (select (select |#memory_int| |v_ULTIMATE.start_sll_circular_remove_first_~head#1.base_20|) 0)))) (= (store |v_#valid_62| (select (select (store |v_#memory_$Pointer$.base_93| |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.base_24| (store (select |v_#memory_$Pointer$.base_93| |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.base_24|) |v_ULTIMATE.start_sll_circular_remove_first_~last~1#1.offset_24| |v_ULTIMATE.start_sll_circular_remove_first_~temp~1#1.base_19|)) |v_ULTIMATE.start_sll_circular_remove_first_~head#1.base_20|) 0) 0) |#valid|))))) (or (not (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (not (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) 0) 0))) (= |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_main_~#s~0#1.base|))' at error location [2023-11-24 23:21:53,876 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:21:53,876 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:21:53,876 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2023-11-24 23:21:53,876 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067495914] [2023-11-24 23:21:53,877 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:21:53,877 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-24 23:21:53,877 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:21:53,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-24 23:21:53,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=405, Unknown=6, NotChecked=42, Total=552 [2023-11-24 23:21:53,879 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 10 states, 10 states have (on average 3.9) internal successors, (39), 10 states have internal predecessors, (39), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-24 23:21:53,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:21:53,935 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2023-11-24 23:21:53,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-24 23:21:53,936 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 10 states have internal predecessors, (39), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 24 [2023-11-24 23:21:53,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:21:53,937 INFO L225 Difference]: With dead ends: 36 [2023-11-24 23:21:53,937 INFO L226 Difference]: Without dead ends: 33 [2023-11-24 23:21:53,938 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 49 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=99, Invalid=405, Unknown=6, NotChecked=42, Total=552 [2023-11-24 23:21:53,939 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 33 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:21:53,939 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 47 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:21:53,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-11-24 23:21:53,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2023-11-24 23:21:53,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 27 states have internal predecessors, (34), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:21:53,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2023-11-24 23:21:53,953 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 24 [2023-11-24 23:21:53,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:21:53,953 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2023-11-24 23:21:53,953 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 10 states have internal predecessors, (39), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-24 23:21:53,953 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2023-11-24 23:21:53,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-24 23:21:53,954 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:21:53,955 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] [2023-11-24 23:21:53,966 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-24 23:21:54,161 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:21:54,162 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:21:54,162 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:21:54,162 INFO L85 PathProgramCache]: Analyzing trace with hash -240224540, now seen corresponding path program 1 times [2023-11-24 23:21:54,162 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:21:54,162 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2142868627] [2023-11-24 23:21:54,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:21:54,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:21:54,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:21:54,568 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:21:54,568 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:21:54,568 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2142868627] [2023-11-24 23:21:54,569 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2142868627] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:21:54,569 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:21:54,569 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-24 23:21:54,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370930094] [2023-11-24 23:21:54,569 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:21:54,569 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 23:21:54,569 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:21:54,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 23:21:54,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-24 23:21:54,570 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 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) [2023-11-24 23:21:54,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:21:54,707 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2023-11-24 23:21:54,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-24 23:21:54,708 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 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 25 [2023-11-24 23:21:54,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:21:54,709 INFO L225 Difference]: With dead ends: 42 [2023-11-24 23:21:54,709 INFO L226 Difference]: Without dead ends: 33 [2023-11-24 23:21:54,709 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:21:54,710 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:21:54,710 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 43 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:21:54,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-11-24 23:21:54,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2023-11-24 23:21:54,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:21:54,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2023-11-24 23:21:54,726 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 25 [2023-11-24 23:21:54,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:21:54,727 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2023-11-24 23:21:54,727 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 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) [2023-11-24 23:21:54,727 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2023-11-24 23:21:54,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-24 23:21:54,728 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:21:54,728 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:21:54,728 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-24 23:21:54,729 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:21:54,729 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:21:54,729 INFO L85 PathProgramCache]: Analyzing trace with hash 600273663, now seen corresponding path program 1 times [2023-11-24 23:21:54,729 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:21:54,730 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975220454] [2023-11-24 23:21:54,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:21:54,730 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:21:54,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:21:55,464 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:21:55,465 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:21:55,465 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975220454] [2023-11-24 23:21:55,465 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1975220454] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:21:55,465 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [189952663] [2023-11-24 23:21:55,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:21:55,465 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:21:55,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:21:55,469 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:21:55,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d6f6eed-447e-4410-bb21-cb15ac10e2cf/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-24 23:21:55,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:21:55,632 INFO L262 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 54 conjunts are in the unsatisfiable core [2023-11-24 23:21:55,636 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:21:55,683 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-24 23:21:55,797 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-24 23:21:55,797 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-24 23:21:55,841 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 [2023-11-24 23:21:55,901 INFO L349 Elim1Store]: treesize reduction 35, result has 20.5 percent of original size [2023-11-24 23:21:55,902 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 53 treesize of output 46 [2023-11-24 23:21:55,954 INFO L349 Elim1Store]: treesize reduction 3, result has 81.3 percent of original size [2023-11-24 23:21:55,954 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 43 treesize of output 27 [2023-11-24 23:21:55,961 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 8 treesize of output 4 [2023-11-24 23:21:55,985 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:21:55,986 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:21:56,002 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 38 treesize of output 30 [2023-11-24 23:21:56,020 WARN L854 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~#s~0#1.base| Int) (v_ArrVal_530 (Array Int Int))) (let ((.cse1 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base| v_ArrVal_530))) (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)) (not (= (select (select .cse1 .cse0) |c_ULTIMATE.start_sll_circular_create_~head~0#1.offset|) .cse0)))))) is different from false [2023-11-24 23:21:56,031 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-24 23:21:56,031 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 69 treesize of output 45 [2023-11-24 23:21:56,098 INFO L349 Elim1Store]: treesize reduction 21, result has 67.2 percent of original size [2023-11-24 23:21:56,098 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 147 treesize of output 155 [2023-11-24 23:21:56,122 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-24 23:21:56,122 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 128 treesize of output 118 [2023-11-24 23:21:56,778 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 1 not checked. [2023-11-24 23:21:56,778 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [189952663] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:21:56,778 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1930122071] [2023-11-24 23:21:56,781 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-24 23:21:56,781 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:21:56,781 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:21:56,781 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:21:56,782 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs