./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-simple/sll2c_remove_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-simple/sll2c_remove_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire --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 3340815bef7e21ae2d4803d7059577c1761bb3b7b4bb24b2b34d5d0d0054fd10 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 20:33:07,105 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 20:33:07,217 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 20:33:07,228 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 20:33:07,228 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 20:33:07,276 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 20:33:07,277 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 20:33:07,277 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 20:33:07,278 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 20:33:07,283 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 20:33:07,284 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 20:33:07,284 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 20:33:07,285 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 20:33:07,287 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 20:33:07,287 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 20:33:07,288 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 20:33:07,288 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 20:33:07,288 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 20:33:07,289 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 20:33:07,289 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 20:33:07,291 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 20:33:07,292 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 20:33:07,293 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 20:33:07,294 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 20:33:07,294 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 20:33:07,295 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 20:33:07,295 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 20:33:07,295 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 20:33:07,296 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 20:33:07,296 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 20:33:07,298 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 20:33:07,298 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 20:33:07,321 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 20:33:07,321 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 20:33:07,322 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 20:33:07,322 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 20:33:07,323 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 20:33:07,323 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:33:07,324 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 20:33:07,324 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 20:33:07,324 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 20:33:07,325 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 20:33:07,325 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 20:33:07,325 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 20:33:07,326 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 20:33:07,326 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 20:33:07,326 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 20:33:07,327 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_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3340815bef7e21ae2d4803d7059577c1761bb3b7b4bb24b2b34d5d0d0054fd10 [2023-11-23 20:33:07,600 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 20:33:07,623 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 20:33:07,626 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 20:33:07,627 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 20:33:07,630 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 20:33:07,631 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/list-simple/sll2c_remove_all_reverse.i [2023-11-23 20:33:10,821 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 20:33:11,100 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 20:33:11,101 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/sv-benchmarks/c/list-simple/sll2c_remove_all_reverse.i [2023-11-23 20:33:11,117 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/data/99f872a02/8f7898483ddc4fbc99ce33d07b5995be/FLAGfb44d534b [2023-11-23 20:33:11,138 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/data/99f872a02/8f7898483ddc4fbc99ce33d07b5995be [2023-11-23 20:33:11,145 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 20:33:11,147 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 20:33:11,149 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 20:33:11,149 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 20:33:11,155 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 20:33:11,156 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:33:11" (1/1) ... [2023-11-23 20:33:11,157 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3811e8f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:11, skipping insertion in model container [2023-11-23 20:33:11,157 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:33:11" (1/1) ... [2023-11-23 20:33:11,202 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 20:33:11,549 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_de861470-9716-4093-9f5e-49e7c2551847/sv-benchmarks/c/list-simple/sll2c_remove_all_reverse.i[24151,24164] [2023-11-23 20:33:11,553 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:33:11,566 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 20:33:11,628 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_de861470-9716-4093-9f5e-49e7c2551847/sv-benchmarks/c/list-simple/sll2c_remove_all_reverse.i[24151,24164] [2023-11-23 20:33:11,629 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:33:11,676 INFO L206 MainTranslator]: Completed translation [2023-11-23 20:33:11,676 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:11 WrapperNode [2023-11-23 20:33:11,676 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 20:33:11,678 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 20:33:11,679 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 20:33:11,679 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 20:33:11,687 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:11" (1/1) ... [2023-11-23 20:33:11,703 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:11" (1/1) ... [2023-11-23 20:33:11,743 INFO L138 Inliner]: procedures = 126, calls = 36, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 120 [2023-11-23 20:33:11,744 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 20:33:11,745 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 20:33:11,745 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 20:33:11,745 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 20:33:11,754 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:11" (1/1) ... [2023-11-23 20:33:11,755 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:11" (1/1) ... [2023-11-23 20:33:11,776 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:11" (1/1) ... [2023-11-23 20:33:11,776 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:11" (1/1) ... [2023-11-23 20:33:11,784 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:11" (1/1) ... [2023-11-23 20:33:11,788 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:11" (1/1) ... [2023-11-23 20:33:11,790 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:11" (1/1) ... [2023-11-23 20:33:11,797 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:11" (1/1) ... [2023-11-23 20:33:11,808 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 20:33:11,823 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 20:33:11,823 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 20:33:11,823 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 20:33:11,824 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:11" (1/1) ... [2023-11-23 20:33:11,830 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:33:11,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:33:11,863 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 20:33:11,873 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 20:33:11,900 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 20:33:11,900 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-23 20:33:11,900 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-23 20:33:11,900 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 20:33:11,902 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 20:33:11,902 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 20:33:11,903 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-23 20:33:11,903 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-23 20:33:11,903 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 20:33:11,904 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-23 20:33:11,904 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 20:33:11,904 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 20:33:11,904 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 20:33:12,101 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 20:33:12,104 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 20:33:12,334 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 20:33:12,381 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 20:33:12,381 INFO L309 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-23 20:33:12,383 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:33:12 BoogieIcfgContainer [2023-11-23 20:33:12,383 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 20:33:12,387 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 20:33:12,387 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 20:33:12,390 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 20:33:12,391 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:33:11" (1/3) ... [2023-11-23 20:33:12,392 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3aa72c8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:33:12, skipping insertion in model container [2023-11-23 20:33:12,392 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:11" (2/3) ... [2023-11-23 20:33:12,392 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3aa72c8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:33:12, skipping insertion in model container [2023-11-23 20:33:12,393 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:33:12" (3/3) ... [2023-11-23 20:33:12,394 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2c_remove_all_reverse.i [2023-11-23 20:33:12,416 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 20:33:12,416 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 20:33:12,466 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 20:33:12,473 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;@1e95990d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 20:33:12,473 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 20:33:12,477 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 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) [2023-11-23 20:33:12,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-23 20:33:12,485 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:33:12,485 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:33:12,486 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:33:12,492 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:33:12,492 INFO L85 PathProgramCache]: Analyzing trace with hash -259320484, now seen corresponding path program 1 times [2023-11-23 20:33:12,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:33:12,501 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [482103285] [2023-11-23 20:33:12,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:12,501 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:33:12,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:33:12,887 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:33:12,887 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:33:12,888 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [482103285] [2023-11-23 20:33:12,889 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [482103285] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:33:12,889 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:33:12,889 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:33:12,891 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805563036] [2023-11-23 20:33:12,892 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:33:12,897 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:33:12,897 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:33:12,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:33:12,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:33:12,939 INFO L87 Difference]: Start difference. First operand has 24 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 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) [2023-11-23 20:33:13,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:33:13,014 INFO L93 Difference]: Finished difference Result 41 states and 58 transitions. [2023-11-23 20:33:13,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:33:13,028 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 [2023-11-23 20:33:13,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:33:13,035 INFO L225 Difference]: With dead ends: 41 [2023-11-23 20:33:13,036 INFO L226 Difference]: Without dead ends: 24 [2023-11-23 20:33:13,072 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 [2023-11-23 20:33:13,080 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 1 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:33:13,081 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 42 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:33:13,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-23 20:33:13,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2023-11-23 20:33:13,120 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) [2023-11-23 20:33:13,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2023-11-23 20:33:13,123 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 10 [2023-11-23 20:33:13,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:33:13,123 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2023-11-23 20:33:13,124 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) [2023-11-23 20:33:13,124 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2023-11-23 20:33:13,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-23 20:33:13,125 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:33:13,125 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:33:13,126 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 20:33:13,126 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:33:13,127 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:33:13,127 INFO L85 PathProgramCache]: Analyzing trace with hash 1125416017, now seen corresponding path program 1 times [2023-11-23 20:33:13,127 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:33:13,128 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [78690389] [2023-11-23 20:33:13,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:13,128 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:33:13,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:33:13,375 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 20:33:13,376 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:33:13,376 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [78690389] [2023-11-23 20:33:13,376 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [78690389] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:33:13,377 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:33:13,377 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 20:33:13,377 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016702145] [2023-11-23 20:33:13,377 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:33:13,379 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 20:33:13,379 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:33:13,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 20:33:13,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 20:33:13,380 INFO L87 Difference]: Start difference. First operand 22 states and 27 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) [2023-11-23 20:33:13,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:33:13,418 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2023-11-23 20:33:13,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 20:33:13,419 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 [2023-11-23 20:33:13,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:33:13,420 INFO L225 Difference]: With dead ends: 34 [2023-11-23 20:33:13,420 INFO L226 Difference]: Without dead ends: 31 [2023-11-23 20:33:13,421 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 [2023-11-23 20:33:13,422 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 38 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 38 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 [2023-11-23 20:33:13,423 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 38 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:33:13,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-11-23 20:33:13,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 23. [2023-11-23 20:33:13,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 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) [2023-11-23 20:33:13,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2023-11-23 20:33:13,432 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 16 [2023-11-23 20:33:13,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:33:13,432 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2023-11-23 20:33:13,433 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) [2023-11-23 20:33:13,433 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2023-11-23 20:33:13,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-23 20:33:13,434 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:33:13,434 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] [2023-11-23 20:33:13,434 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 20:33:13,435 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:33:13,435 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:33:13,436 INFO L85 PathProgramCache]: Analyzing trace with hash -2116327376, now seen corresponding path program 1 times [2023-11-23 20:33:13,436 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:33:13,436 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1059692611] [2023-11-23 20:33:13,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:13,437 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:33:13,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:33:13,732 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 20:33:13,733 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:33:13,733 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1059692611] [2023-11-23 20:33:13,733 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1059692611] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:33:13,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1716116296] [2023-11-23 20:33:13,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:13,736 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:33:13,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:33:13,742 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:33:13,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 20:33:13,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:33:13,936 INFO L262 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-23 20:33:13,946 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:33:14,091 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 20:33:14,091 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:33:14,168 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 20:33:14,168 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1716116296] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:33:14,174 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1571201675] [2023-11-23 20:33:14,200 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-23 20:33:14,201 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:33:14,210 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:33:14,216 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:33:14,216 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:33:18,928 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-23 20:33:18,984 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:33:31,850 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1571201675] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:33:31,851 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:33:31,851 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [5, 5, 5] total 24 [2023-11-23 20:33:31,851 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754108897] [2023-11-23 20:33:31,852 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:33:31,852 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-23 20:33:31,852 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:33:31,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-23 20:33:31,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=441, Unknown=5, NotChecked=0, Total=552 [2023-11-23 20:33:31,855 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 16 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 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) [2023-11-23 20:33:35,222 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-23 20:33:37,344 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-23 20:33:43,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:33:43,641 INFO L93 Difference]: Finished difference Result 50 states and 64 transitions. [2023-11-23 20:33:43,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-11-23 20:33:43,642 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 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 [2023-11-23 20:33:43,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:33:43,643 INFO L225 Difference]: With dead ends: 50 [2023-11-23 20:33:43,644 INFO L226 Difference]: Without dead ends: 37 [2023-11-23 20:33:43,644 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=140, Invalid=554, Unknown=8, NotChecked=0, Total=702 [2023-11-23 20:33:43,646 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 23 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 2 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.8s IncrementalHoareTripleChecker+Time [2023-11-23 20:33:43,646 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 52 Invalid, 259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 253 Invalid, 4 Unknown, 0 Unchecked, 6.8s Time] [2023-11-23 20:33:43,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-11-23 20:33:43,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 32. [2023-11-23 20:33:43,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 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) [2023-11-23 20:33:43,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2023-11-23 20:33:43,658 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 22 [2023-11-23 20:33:43,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:33:43,659 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2023-11-23 20:33:43,659 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 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) [2023-11-23 20:33:43,659 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2023-11-23 20:33:43,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-23 20:33:43,660 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:33:43,660 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, 1, 1, 1] [2023-11-23 20:33:43,674 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-23 20:33:43,862 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:33:43,863 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:33:43,864 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:33:43,864 INFO L85 PathProgramCache]: Analyzing trace with hash -1489521864, now seen corresponding path program 1 times [2023-11-23 20:33:43,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:33:43,865 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [668511372] [2023-11-23 20:33:43,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:43,868 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:33:43,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:33:43,987 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:33:43,987 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:33:43,990 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [668511372] [2023-11-23 20:33:43,990 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [668511372] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:33:43,993 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1298914766] [2023-11-23 20:33:43,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:43,994 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:33:43,994 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:33:43,995 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:33:44,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 20:33:44,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:33:44,133 INFO L262 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-23 20:33:44,143 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:33:44,215 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:33:44,215 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:33:44,281 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:33:44,281 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1298914766] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:33:44,281 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1761014284] [2023-11-23 20:33:44,285 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-11-23 20:33:44,285 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:33:44,286 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:33:44,286 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:33:44,286 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:33:46,293 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-23 20:33:46,354 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:33:57,432 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '625#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (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) (exists ((|v_ULTIMATE.start_sll_circular_remove_last_~last~1#1.offset_30| Int) (|v_ULTIMATE.start_sll_circular_remove_last_~last~1#1.base_30| Int) (|v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20| Int)) (and (exists ((|v_#memory_int_86| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_78| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_78| (Array Int (Array Int Int)))) (and (= |#memory_int| (store |v_#memory_int_86| (select (select |v_#memory_$Pointer$.base_78| |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|) 0) (store (select |v_#memory_int_86| (select (select |v_#memory_$Pointer$.base_78| |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|) 0)) (select (select |v_#memory_$Pointer$.offset_78| |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|) 0) (select (select |#memory_int| (select (select |v_#memory_$Pointer$.base_78| |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|) 0)) (select (select |v_#memory_$Pointer$.offset_78| |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|) 0))))) (= |v_ULTIMATE.start_sll_circular_remove_last_~last~1#1.offset_30| (select (select |v_#memory_$Pointer$.offset_78| (select (select |v_#memory_$Pointer$.base_78| |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|) 0)) (select (select |v_#memory_$Pointer$.offset_78| |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|) 0))) (or (not (= (select (select |v_#memory_$Pointer$.offset_78| |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|) 0) |v_ULTIMATE.start_sll_circular_remove_last_~last~1#1.offset_30|)) (not (= |v_ULTIMATE.start_sll_circular_remove_last_~last~1#1.base_30| (select (select |v_#memory_$Pointer$.base_78| |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|) 0)))) (= (store |v_#memory_$Pointer$.base_78| (select (select |v_#memory_$Pointer$.base_78| |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|) 0) (store (select |v_#memory_$Pointer$.base_78| (select (select |v_#memory_$Pointer$.base_78| |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|) 0)) (select (select |v_#memory_$Pointer$.offset_78| |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|) 0) (select (select |v_#memory_$Pointer$.base_78| |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|) 0))) |#memory_$Pointer$.base|) (= |v_ULTIMATE.start_sll_circular_remove_last_~last~1#1.base_30| (select (select |v_#memory_$Pointer$.base_78| (select (select |v_#memory_$Pointer$.base_78| |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|) 0)) (select (select |v_#memory_$Pointer$.offset_78| |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|) 0))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_78| (select (select |v_#memory_$Pointer$.base_78| |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|) 0) (store (select |v_#memory_$Pointer$.offset_78| (select (select |v_#memory_$Pointer$.base_78| |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|) 0)) (select (select |v_#memory_$Pointer$.offset_78| |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|) 0) (select (select |v_#memory_$Pointer$.offset_78| |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|) 0)))))) (= 2 |ULTIMATE.start_main_~i~0#1|) (exists ((|v_#valid_49| (Array Int Int))) (= (store |v_#valid_49| |v_ULTIMATE.start_sll_circular_remove_last_~last~1#1.base_30| 0) |#valid|)) (<= 2 |v_ULTIMATE.start_sll_circular_remove_last_~head#1.base_20|))) (= |ULTIMATE.start_main_~len~0#1| 2) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-11-23 20:33:57,432 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:33:57,432 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:33:57,432 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2023-11-23 20:33:57,433 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544473124] [2023-11-23 20:33:57,433 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:33:57,433 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-23 20:33:57,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:33:57,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-23 20:33:57,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=565, Unknown=11, NotChecked=0, Total=702 [2023-11-23 20:33:57,435 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 10 states, 10 states have (on average 4.8) internal successors, (48), 10 states have internal predecessors, (48), 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) [2023-11-23 20:33:57,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:33:57,499 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2023-11-23 20:33:57,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 20:33:57,500 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.8) internal successors, (48), 10 states have internal predecessors, (48), 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 27 [2023-11-23 20:33:57,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:33:57,501 INFO L225 Difference]: With dead ends: 51 [2023-11-23 20:33:57,501 INFO L226 Difference]: Without dead ends: 48 [2023-11-23 20:33:57,502 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 55 SyntacticMatches, 4 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=126, Invalid=565, Unknown=11, NotChecked=0, Total=702 [2023-11-23 20:33:57,503 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 33 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:33:57,504 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 83 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:33:57,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-11-23 20:33:57,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 44. [2023-11-23 20:33:57,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 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) [2023-11-23 20:33:57,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 56 transitions. [2023-11-23 20:33:57,520 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 56 transitions. Word has length 27 [2023-11-23 20:33:57,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:33:57,520 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 56 transitions. [2023-11-23 20:33:57,520 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.8) internal successors, (48), 10 states have internal predecessors, (48), 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) [2023-11-23 20:33:57,521 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 56 transitions. [2023-11-23 20:33:57,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-23 20:33:57,522 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:33:57,522 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:33:57,550 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-23 20:33:57,738 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:33:57,739 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:33:57,739 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:33:57,739 INFO L85 PathProgramCache]: Analyzing trace with hash 1463743993, now seen corresponding path program 1 times [2023-11-23 20:33:57,739 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:33:57,739 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124658324] [2023-11-23 20:33:57,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:57,740 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:33:57,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:33:58,379 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:33:58,379 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:33:58,380 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1124658324] [2023-11-23 20:33:58,380 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1124658324] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:33:58,380 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [580007495] [2023-11-23 20:33:58,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:58,380 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:33:58,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:33:58,383 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:33:58,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 20:33:58,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:33:58,533 INFO L262 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 40 conjunts are in the unsatisfiable core [2023-11-23 20:33:58,538 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:33:58,643 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 20:33:58,648 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 20:33:58,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 20:33:58,935 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-23 20:33:58,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 20:33:58,944 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-23 20:33:58,965 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 20:33:58,965 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:33:58,965 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [580007495] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:33:58,965 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:33:58,966 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [9] total 15 [2023-11-23 20:33:58,966 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504064634] [2023-11-23 20:33:58,966 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:33:58,966 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 20:33:58,967 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:33:58,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 20:33:58,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=147, Unknown=0, NotChecked=0, Total=210 [2023-11-23 20:33:58,968 INFO L87 Difference]: Start difference. First operand 44 states and 56 transitions. Second operand has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 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) [2023-11-23 20:33:59,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:33:59,164 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2023-11-23 20:33:59,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 20:33:59,165 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 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 33 [2023-11-23 20:33:59,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:33:59,166 INFO L225 Difference]: With dead ends: 61 [2023-11-23 20:33:59,166 INFO L226 Difference]: Without dead ends: 34 [2023-11-23 20:33:59,167 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=84, Invalid=188, Unknown=0, NotChecked=0, Total=272 [2023-11-23 20:33:59,168 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 29 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:33:59,168 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 59 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:33:59,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-11-23 20:33:59,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2023-11-23 20:33:59,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 30 states have (on average 1.2) internal successors, (36), 30 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) [2023-11-23 20:33:59,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2023-11-23 20:33:59,187 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 33 [2023-11-23 20:33:59,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:33:59,187 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2023-11-23 20:33:59,187 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 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) [2023-11-23 20:33:59,187 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2023-11-23 20:33:59,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-11-23 20:33:59,189 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:33:59,189 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:33:59,216 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 20:33:59,402 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:33:59,402 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:33:59,403 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:33:59,403 INFO L85 PathProgramCache]: Analyzing trace with hash -560186986, now seen corresponding path program 2 times [2023-11-23 20:33:59,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:33:59,403 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1028645422] [2023-11-23 20:33:59,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:59,403 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:33:59,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:33:59,572 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 20:33:59,572 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:33:59,572 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1028645422] [2023-11-23 20:33:59,572 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1028645422] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:33:59,573 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:33:59,573 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 20:33:59,573 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477901524] [2023-11-23 20:33:59,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:33:59,573 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 20:33:59,574 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:33:59,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 20:33:59,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 20:33:59,575 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 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) [2023-11-23 20:33:59,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:33:59,652 INFO L93 Difference]: Finished difference Result 50 states and 59 transitions. [2023-11-23 20:33:59,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 20:33:59,653 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 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 36 [2023-11-23 20:33:59,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:33:59,655 INFO L225 Difference]: With dead ends: 50 [2023-11-23 20:33:59,656 INFO L226 Difference]: Without dead ends: 36 [2023-11-23 20:33:59,656 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-23 20:33:59,659 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 1 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:33:59,659 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 42 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:33:59,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-23 20:33:59,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2023-11-23 20:33:59,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 32 states have (on average 1.1875) internal successors, (38), 32 states have internal predecessors, (38), 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) [2023-11-23 20:33:59,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2023-11-23 20:33:59,679 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 36 [2023-11-23 20:33:59,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:33:59,681 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2023-11-23 20:33:59,681 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 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) [2023-11-23 20:33:59,681 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2023-11-23 20:33:59,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-11-23 20:33:59,684 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:33:59,685 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:33:59,685 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-23 20:33:59,685 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:33:59,685 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:33:59,686 INFO L85 PathProgramCache]: Analyzing trace with hash -916261391, now seen corresponding path program 3 times [2023-11-23 20:33:59,686 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:33:59,686 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817976552] [2023-11-23 20:33:59,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:59,686 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:33:59,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:00,882 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 20:34:00,882 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:00,882 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [817976552] [2023-11-23 20:34:00,882 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [817976552] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:34:00,883 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1894753188] [2023-11-23 20:34:00,883 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 20:34:00,883 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:00,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:00,887 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:00,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_de861470-9716-4093-9f5e-49e7c2551847/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 20:34:01,259 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 20:34:01,259 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:34:01,263 INFO L262 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 65 conjunts are in the unsatisfiable core [2023-11-23 20:34:01,267 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:01,447 INFO L349 Elim1Store]: treesize reduction 33, result has 17.5 percent of original size [2023-11-23 20:34:01,447 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 55 treesize of output 41 [2023-11-23 20:34:01,462 INFO L349 Elim1Store]: treesize reduction 33, result has 17.5 percent of original size [2023-11-23 20:34:01,463 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 47 treesize of output 37 [2023-11-23 20:34:02,177 INFO L349 Elim1Store]: treesize reduction 68, result has 77.4 percent of original size [2023-11-23 20:34:02,178 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 9 new quantified variables, introduced 21 case distinctions, treesize of input 160 treesize of output 322 [2023-11-23 20:34:02,307 INFO L349 Elim1Store]: treesize reduction 36, result has 70.2 percent of original size [2023-11-23 20:34:02,307 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 10 case distinctions, treesize of input 245 treesize of output 255