./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.14.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4fc63b2a 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_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.14.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2 --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 78a96934dff25285973ef889167a345947d7e73ab8a2ec405d96bd61e690530f --- Real Ultimate output --- This is Ultimate 0.2.5-dev-4fc63b2 [2024-11-02 12:39:11,484 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-02 12:39:11,589 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-02 12:39:11,596 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-02 12:39:11,598 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-02 12:39:11,639 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-02 12:39:11,639 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-02 12:39:11,640 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-02 12:39:11,641 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-02 12:39:11,643 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-02 12:39:11,643 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-02 12:39:11,644 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-02 12:39:11,644 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-02 12:39:11,646 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-02 12:39:11,646 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-02 12:39:11,648 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-02 12:39:11,649 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-02 12:39:11,649 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-02 12:39:11,650 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-02 12:39:11,650 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-02 12:39:11,650 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-02 12:39:11,655 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-02 12:39:11,656 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-02 12:39:11,656 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-02 12:39:11,657 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-02 12:39:11,657 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-02 12:39:11,658 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-02 12:39:11,658 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-02 12:39:11,658 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-02 12:39:11,659 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-02 12:39:11,661 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-02 12:39:11,661 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-02 12:39:11,661 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-02 12:39:11,662 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-02 12:39:11,662 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-02 12:39:11,662 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-02 12:39:11,663 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-02 12:39:11,663 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-02 12:39:11,664 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-02 12:39:11,664 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-02 12:39:11,664 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-02 12:39:11,665 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-02 12:39:11,666 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-02 12:39:11,666 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-02 12:39:11,667 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-02 12:39:11,667 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-02 12:39:11,668 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-02 12:39:11,668 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_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 78a96934dff25285973ef889167a345947d7e73ab8a2ec405d96bd61e690530f [2024-11-02 12:39:11,994 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-02 12:39:12,023 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-02 12:39:12,026 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-02 12:39:12,028 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-02 12:39:12,029 INFO L274 PluginConnector]: CDTParser initialized [2024-11-02 12:39:12,030 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/../../sv-benchmarks/c/systemc/token_ring.14.cil.c Unable to find full path for "g++" [2024-11-02 12:39:13,981 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-02 12:39:14,270 INFO L384 CDTParser]: Found 1 translation units. [2024-11-02 12:39:14,271 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/sv-benchmarks/c/systemc/token_ring.14.cil.c [2024-11-02 12:39:14,295 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/data/fba455414/a6c72d916aee474ebd3ad5703ec7c828/FLAG32a7e88d2 [2024-11-02 12:39:14,314 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/data/fba455414/a6c72d916aee474ebd3ad5703ec7c828 [2024-11-02 12:39:14,317 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-02 12:39:14,318 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-02 12:39:14,320 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-02 12:39:14,320 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-02 12:39:14,331 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-02 12:39:14,332 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 12:39:14" (1/1) ... [2024-11-02 12:39:14,333 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@10a7fccc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:39:14, skipping insertion in model container [2024-11-02 12:39:14,334 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 12:39:14" (1/1) ... [2024-11-02 12:39:14,387 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-02 12:39:14,606 WARN L251 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_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/sv-benchmarks/c/systemc/token_ring.14.cil.c[669,682] [2024-11-02 12:39:14,790 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-02 12:39:14,808 INFO L200 MainTranslator]: Completed pre-run [2024-11-02 12:39:14,820 WARN L251 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_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/sv-benchmarks/c/systemc/token_ring.14.cil.c[669,682] [2024-11-02 12:39:14,929 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-02 12:39:14,973 INFO L204 MainTranslator]: Completed translation [2024-11-02 12:39:14,974 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:39:14 WrapperNode [2024-11-02 12:39:14,974 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-02 12:39:14,975 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-02 12:39:14,976 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-02 12:39:14,976 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-02 12:39:14,984 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:39:14" (1/1) ... [2024-11-02 12:39:15,004 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:39:14" (1/1) ... [2024-11-02 12:39:15,078 INFO L138 Inliner]: procedures = 52, calls = 68, calls flagged for inlining = 35, calls inlined = 35, statements flattened = 883 [2024-11-02 12:39:15,078 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-02 12:39:15,079 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-02 12:39:15,079 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-02 12:39:15,079 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-02 12:39:15,099 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:39:14" (1/1) ... [2024-11-02 12:39:15,099 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:39:14" (1/1) ... [2024-11-02 12:39:15,107 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:39:14" (1/1) ... [2024-11-02 12:39:15,107 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:39:14" (1/1) ... [2024-11-02 12:39:15,130 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:39:14" (1/1) ... [2024-11-02 12:39:15,153 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:39:14" (1/1) ... [2024-11-02 12:39:15,155 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:39:14" (1/1) ... [2024-11-02 12:39:15,158 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:39:14" (1/1) ... [2024-11-02 12:39:15,163 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-02 12:39:15,164 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-02 12:39:15,164 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-02 12:39:15,165 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-02 12:39:15,166 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:39:14" (1/1) ... [2024-11-02 12:39:15,171 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-02 12:39:15,185 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:39:15,201 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-02 12:39:15,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-02 12:39:15,237 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-02 12:39:15,237 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2024-11-02 12:39:15,237 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2024-11-02 12:39:15,238 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2024-11-02 12:39:15,239 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2024-11-02 12:39:15,240 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2024-11-02 12:39:15,240 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2024-11-02 12:39:15,240 INFO L130 BoogieDeclarations]: Found specification of procedure error [2024-11-02 12:39:15,240 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2024-11-02 12:39:15,241 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2024-11-02 12:39:15,241 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2024-11-02 12:39:15,241 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2024-11-02 12:39:15,241 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2024-11-02 12:39:15,241 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2024-11-02 12:39:15,242 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2024-11-02 12:39:15,242 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-02 12:39:15,242 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-02 12:39:15,242 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-02 12:39:15,433 INFO L238 CfgBuilder]: Building ICFG [2024-11-02 12:39:15,439 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-02 12:39:16,772 INFO L? ?]: Removed 101 outVars from TransFormulas that were not future-live. [2024-11-02 12:39:16,772 INFO L287 CfgBuilder]: Performing block encoding [2024-11-02 12:39:17,378 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-02 12:39:17,380 INFO L316 CfgBuilder]: Removed 15 assume(true) statements. [2024-11-02 12:39:17,381 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 12:39:17 BoogieIcfgContainer [2024-11-02 12:39:17,381 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-02 12:39:17,384 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-02 12:39:17,385 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-02 12:39:17,389 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-02 12:39:17,389 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 12:39:14" (1/3) ... [2024-11-02 12:39:17,390 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1dad11a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 12:39:17, skipping insertion in model container [2024-11-02 12:39:17,391 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:39:14" (2/3) ... [2024-11-02 12:39:17,392 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1dad11a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 12:39:17, skipping insertion in model container [2024-11-02 12:39:17,393 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 12:39:17" (3/3) ... [2024-11-02 12:39:17,394 INFO L112 eAbstractionObserver]: Analyzing ICFG token_ring.14.cil.c [2024-11-02 12:39:17,417 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-02 12:39:17,417 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-11-02 12:39:17,511 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-02 12:39:17,518 INFO L333 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, 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;@2f5c2b95, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-02 12:39:17,519 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-02 12:39:17,526 INFO L276 IsEmpty]: Start isEmpty. Operand has 207 states, 170 states have (on average 1.5235294117647058) internal successors, (259), 174 states have internal predecessors, (259), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2024-11-02 12:39:17,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2024-11-02 12:39:17,542 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:39:17,543 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:39:17,544 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:39:17,550 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:39:17,550 INFO L85 PathProgramCache]: Analyzing trace with hash 950657362, now seen corresponding path program 1 times [2024-11-02 12:39:17,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:39:17,563 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [771331426] [2024-11-02 12:39:17,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:17,564 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:39:17,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:18,207 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 12:39:18,208 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:39:18,208 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [771331426] [2024-11-02 12:39:18,210 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [771331426] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:39:18,211 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 12:39:18,211 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2024-11-02 12:39:18,213 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928507004] [2024-11-02 12:39:18,213 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:39:18,217 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-11-02 12:39:18,218 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:39:18,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-11-02 12:39:18,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-02 12:39:18,248 INFO L87 Difference]: Start difference. First operand has 207 states, 170 states have (on average 1.5235294117647058) internal successors, (259), 174 states have internal predecessors, (259), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2024-11-02 12:39:18,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:39:18,945 INFO L93 Difference]: Finished difference Result 598 states and 927 transitions. [2024-11-02 12:39:18,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-02 12:39:18,948 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 67 [2024-11-02 12:39:18,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:39:18,960 INFO L225 Difference]: With dead ends: 598 [2024-11-02 12:39:18,960 INFO L226 Difference]: Without dead ends: 392 [2024-11-02 12:39:18,966 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-02 12:39:18,969 INFO L432 NwaCegarLoop]: 488 mSDtfsCounter, 546 mSDsluCounter, 388 mSDsCounter, 0 mSdLazyCounter, 306 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 546 SdHoareTripleChecker+Valid, 876 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-02 12:39:18,971 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [546 Valid, 876 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 306 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-11-02 12:39:18,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2024-11-02 12:39:19,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 391. [2024-11-02 12:39:19,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 328 states have (on average 1.4878048780487805) internal successors, (488), 331 states have internal predecessors, (488), 50 states have call successors, (50), 13 states have call predecessors, (50), 12 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2024-11-02 12:39:19,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 586 transitions. [2024-11-02 12:39:19,067 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 586 transitions. Word has length 67 [2024-11-02 12:39:19,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:39:19,068 INFO L471 AbstractCegarLoop]: Abstraction has 391 states and 586 transitions. [2024-11-02 12:39:19,069 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2024-11-02 12:39:19,069 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 586 transitions. [2024-11-02 12:39:19,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2024-11-02 12:39:19,078 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:39:19,078 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:39:19,078 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-02 12:39:19,079 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:39:19,079 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:39:19,079 INFO L85 PathProgramCache]: Analyzing trace with hash -1469134282, now seen corresponding path program 1 times [2024-11-02 12:39:19,080 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:39:19,081 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1115224636] [2024-11-02 12:39:19,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:19,082 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:39:19,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:19,436 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2024-11-02 12:39:19,436 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:39:19,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1115224636] [2024-11-02 12:39:19,437 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1115224636] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:39:19,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1955142967] [2024-11-02 12:39:19,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:19,438 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:39:19,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:39:19,460 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:39:19,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-02 12:39:19,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:19,822 INFO L255 TraceCheckSpWp]: Trace formula consists of 879 conjuncts, 2 conjuncts are in the unsatisfiable core [2024-11-02 12:39:19,836 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:39:19,987 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2024-11-02 12:39:19,987 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-02 12:39:19,987 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1955142967] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:39:19,988 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-02 12:39:19,988 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2024-11-02 12:39:19,989 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731644125] [2024-11-02 12:39:19,992 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:39:19,993 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-02 12:39:19,994 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:39:19,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-02 12:39:19,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-02 12:39:19,995 INFO L87 Difference]: Start difference. First operand 391 states and 586 transitions. Second operand has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2024-11-02 12:39:20,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:39:20,237 INFO L93 Difference]: Finished difference Result 1156 states and 1761 transitions. [2024-11-02 12:39:20,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-02 12:39:20,239 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2024-11-02 12:39:20,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:39:20,249 INFO L225 Difference]: With dead ends: 1156 [2024-11-02 12:39:20,249 INFO L226 Difference]: Without dead ends: 770 [2024-11-02 12:39:20,255 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-02 12:39:20,257 INFO L432 NwaCegarLoop]: 316 mSDtfsCounter, 256 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 563 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-02 12:39:20,257 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [256 Valid, 563 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-02 12:39:20,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 770 states. [2024-11-02 12:39:20,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 770 to 764. [2024-11-02 12:39:20,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 764 states, 647 states have (on average 1.4853168469860896) internal successors, (961), 651 states have internal predecessors, (961), 92 states have call successors, (92), 25 states have call predecessors, (92), 24 states have return successors, (90), 88 states have call predecessors, (90), 90 states have call successors, (90) [2024-11-02 12:39:20,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 764 states to 764 states and 1143 transitions. [2024-11-02 12:39:20,335 INFO L78 Accepts]: Start accepts. Automaton has 764 states and 1143 transitions. Word has length 137 [2024-11-02 12:39:20,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:39:20,335 INFO L471 AbstractCegarLoop]: Abstraction has 764 states and 1143 transitions. [2024-11-02 12:39:20,335 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2024-11-02 12:39:20,336 INFO L276 IsEmpty]: Start isEmpty. Operand 764 states and 1143 transitions. [2024-11-02 12:39:20,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2024-11-02 12:39:20,345 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:39:20,345 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:39:20,368 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2024-11-02 12:39:20,550 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:39:20,551 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:39:20,551 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:39:20,551 INFO L85 PathProgramCache]: Analyzing trace with hash -70878890, now seen corresponding path program 1 times [2024-11-02 12:39:20,551 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:39:20,552 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1307756840] [2024-11-02 12:39:20,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:20,552 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:39:20,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:20,748 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2024-11-02 12:39:20,748 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:39:20,749 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1307756840] [2024-11-02 12:39:20,749 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1307756840] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:39:20,749 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [756201418] [2024-11-02 12:39:20,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:20,750 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:39:20,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:39:20,752 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:39:20,753 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-02 12:39:21,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:21,044 INFO L255 TraceCheckSpWp]: Trace formula consists of 873 conjuncts, 2 conjuncts are in the unsatisfiable core [2024-11-02 12:39:21,053 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:39:21,113 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2024-11-02 12:39:21,113 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-02 12:39:21,114 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [756201418] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:39:21,114 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-02 12:39:21,114 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2024-11-02 12:39:21,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614613610] [2024-11-02 12:39:21,115 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:39:21,115 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-02 12:39:21,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:39:21,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-02 12:39:21,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-02 12:39:21,117 INFO L87 Difference]: Start difference. First operand 764 states and 1143 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2024-11-02 12:39:21,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:39:21,371 INFO L93 Difference]: Finished difference Result 2269 states and 3450 transitions. [2024-11-02 12:39:21,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-02 12:39:21,372 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2024-11-02 12:39:21,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:39:21,385 INFO L225 Difference]: With dead ends: 2269 [2024-11-02 12:39:21,385 INFO L226 Difference]: Without dead ends: 1510 [2024-11-02 12:39:21,389 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-02 12:39:21,390 INFO L432 NwaCegarLoop]: 314 mSDtfsCounter, 280 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 280 SdHoareTripleChecker+Valid, 561 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-02 12:39:21,391 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [280 Valid, 561 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-02 12:39:21,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1510 states. [2024-11-02 12:39:21,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1510 to 1502. [2024-11-02 12:39:21,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1502 states, 1279 states have (on average 1.4816262705238468) internal successors, (1895), 1285 states have internal predecessors, (1895), 174 states have call successors, (174), 49 states have call predecessors, (174), 48 states have return successors, (172), 168 states have call predecessors, (172), 172 states have call successors, (172) [2024-11-02 12:39:21,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1502 states to 1502 states and 2241 transitions. [2024-11-02 12:39:21,492 INFO L78 Accepts]: Start accepts. Automaton has 1502 states and 2241 transitions. Word has length 137 [2024-11-02 12:39:21,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:39:21,494 INFO L471 AbstractCegarLoop]: Abstraction has 1502 states and 2241 transitions. [2024-11-02 12:39:21,494 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2024-11-02 12:39:21,495 INFO L276 IsEmpty]: Start isEmpty. Operand 1502 states and 2241 transitions. [2024-11-02 12:39:21,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2024-11-02 12:39:21,501 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:39:21,502 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:39:21,524 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2024-11-02 12:39:21,706 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:39:21,707 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:39:21,707 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:39:21,708 INFO L85 PathProgramCache]: Analyzing trace with hash 80398454, now seen corresponding path program 1 times [2024-11-02 12:39:21,708 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:39:21,708 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [633448044] [2024-11-02 12:39:21,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:21,710 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:39:21,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:21,912 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2024-11-02 12:39:21,912 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:39:21,912 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [633448044] [2024-11-02 12:39:21,912 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [633448044] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:39:21,913 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1431684437] [2024-11-02 12:39:21,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:21,913 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:39:21,913 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:39:21,915 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:39:21,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-02 12:39:22,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:22,158 INFO L255 TraceCheckSpWp]: Trace formula consists of 867 conjuncts, 2 conjuncts are in the unsatisfiable core [2024-11-02 12:39:22,163 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:39:22,204 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2024-11-02 12:39:22,204 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-02 12:39:22,204 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1431684437] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:39:22,204 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-02 12:39:22,205 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2024-11-02 12:39:22,205 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246216425] [2024-11-02 12:39:22,205 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:39:22,206 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-02 12:39:22,206 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:39:22,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-02 12:39:22,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2024-11-02 12:39:22,207 INFO L87 Difference]: Start difference. First operand 1502 states and 2241 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2024-11-02 12:39:22,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:39:22,481 INFO L93 Difference]: Finished difference Result 4471 states and 6778 transitions. [2024-11-02 12:39:22,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-02 12:39:22,481 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2024-11-02 12:39:22,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:39:22,497 INFO L225 Difference]: With dead ends: 4471 [2024-11-02 12:39:22,498 INFO L226 Difference]: Without dead ends: 2974 [2024-11-02 12:39:22,504 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2024-11-02 12:39:22,505 INFO L432 NwaCegarLoop]: 312 mSDtfsCounter, 283 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 283 SdHoareTripleChecker+Valid, 559 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-02 12:39:22,505 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [283 Valid, 559 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-02 12:39:22,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2974 states. [2024-11-02 12:39:22,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2974 to 2962. [2024-11-02 12:39:22,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2962 states, 2531 states have (on average 1.477281706835243) internal successors, (3739), 2541 states have internal predecessors, (3739), 334 states have call successors, (334), 97 states have call predecessors, (334), 96 states have return successors, (332), 324 states have call predecessors, (332), 332 states have call successors, (332) [2024-11-02 12:39:22,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2962 states to 2962 states and 4405 transitions. [2024-11-02 12:39:22,701 INFO L78 Accepts]: Start accepts. Automaton has 2962 states and 4405 transitions. Word has length 137 [2024-11-02 12:39:22,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:39:22,703 INFO L471 AbstractCegarLoop]: Abstraction has 2962 states and 4405 transitions. [2024-11-02 12:39:22,704 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2024-11-02 12:39:22,704 INFO L276 IsEmpty]: Start isEmpty. Operand 2962 states and 4405 transitions. [2024-11-02 12:39:22,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2024-11-02 12:39:22,717 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:39:22,717 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:39:22,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2024-11-02 12:39:22,921 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:39:22,922 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:39:22,922 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:39:22,923 INFO L85 PathProgramCache]: Analyzing trace with hash 1363060054, now seen corresponding path program 1 times [2024-11-02 12:39:22,923 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:39:22,923 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717793575] [2024-11-02 12:39:22,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:22,924 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:39:22,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:23,087 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2024-11-02 12:39:23,088 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:39:23,088 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [717793575] [2024-11-02 12:39:23,089 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [717793575] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:39:23,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [141200797] [2024-11-02 12:39:23,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:23,092 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:39:23,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:39:23,094 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:39:23,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-02 12:39:23,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:23,387 INFO L255 TraceCheckSpWp]: Trace formula consists of 861 conjuncts, 2 conjuncts are in the unsatisfiable core [2024-11-02 12:39:23,394 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:39:23,478 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2024-11-02 12:39:23,481 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-02 12:39:23,482 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [141200797] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:39:23,482 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-02 12:39:23,482 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2024-11-02 12:39:23,482 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335102786] [2024-11-02 12:39:23,482 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:39:23,483 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-02 12:39:23,483 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:39:23,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-02 12:39:23,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-02 12:39:23,488 INFO L87 Difference]: Start difference. First operand 2962 states and 4405 transitions. Second operand has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2024-11-02 12:39:24,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:39:24,030 INFO L93 Difference]: Finished difference Result 8827 states and 13334 transitions. [2024-11-02 12:39:24,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-02 12:39:24,031 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2024-11-02 12:39:24,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:39:24,072 INFO L225 Difference]: With dead ends: 8827 [2024-11-02 12:39:24,073 INFO L226 Difference]: Without dead ends: 5870 [2024-11-02 12:39:24,088 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-02 12:39:24,091 INFO L432 NwaCegarLoop]: 256 mSDtfsCounter, 268 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 503 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-02 12:39:24,093 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [268 Valid, 503 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-02 12:39:24,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5870 states. [2024-11-02 12:39:24,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5870 to 5850. [2024-11-02 12:39:24,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5850 states, 5011 states have (on average 1.4725603671921772) internal successors, (7379), 5029 states have internal predecessors, (7379), 646 states have call successors, (646), 193 states have call predecessors, (646), 192 states have return successors, (644), 628 states have call predecessors, (644), 644 states have call successors, (644) [2024-11-02 12:39:24,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5850 states to 5850 states and 8669 transitions. [2024-11-02 12:39:24,513 INFO L78 Accepts]: Start accepts. Automaton has 5850 states and 8669 transitions. Word has length 137 [2024-11-02 12:39:24,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:39:24,514 INFO L471 AbstractCegarLoop]: Abstraction has 5850 states and 8669 transitions. [2024-11-02 12:39:24,514 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2024-11-02 12:39:24,514 INFO L276 IsEmpty]: Start isEmpty. Operand 5850 states and 8669 transitions. [2024-11-02 12:39:24,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2024-11-02 12:39:24,527 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:39:24,528 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:39:24,552 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2024-11-02 12:39:24,732 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:39:24,732 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:39:24,733 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:39:24,733 INFO L85 PathProgramCache]: Analyzing trace with hash -1142381450, now seen corresponding path program 1 times [2024-11-02 12:39:24,733 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:39:24,733 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933966650] [2024-11-02 12:39:24,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:24,734 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:39:24,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:24,914 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2024-11-02 12:39:24,915 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:39:24,915 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1933966650] [2024-11-02 12:39:24,915 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1933966650] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:39:24,915 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1144934450] [2024-11-02 12:39:24,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:24,916 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:39:24,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:39:24,918 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:39:24,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-02 12:39:25,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:25,174 INFO L255 TraceCheckSpWp]: Trace formula consists of 855 conjuncts, 2 conjuncts are in the unsatisfiable core [2024-11-02 12:39:25,178 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:39:25,271 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2024-11-02 12:39:25,271 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-02 12:39:25,271 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1144934450] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:39:25,273 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-02 12:39:25,273 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2024-11-02 12:39:25,274 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110851544] [2024-11-02 12:39:25,274 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:39:25,274 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-02 12:39:25,275 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:39:25,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-02 12:39:25,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-02 12:39:25,277 INFO L87 Difference]: Start difference. First operand 5850 states and 8669 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2024-11-02 12:39:25,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:39:25,909 INFO L93 Difference]: Finished difference Result 17443 states and 26246 transitions. [2024-11-02 12:39:25,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-02 12:39:25,911 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2024-11-02 12:39:25,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:39:25,988 INFO L225 Difference]: With dead ends: 17443 [2024-11-02 12:39:25,989 INFO L226 Difference]: Without dead ends: 11598 [2024-11-02 12:39:26,015 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-02 12:39:26,017 INFO L432 NwaCegarLoop]: 256 mSDtfsCounter, 262 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 503 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-02 12:39:26,017 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [262 Valid, 503 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-02 12:39:26,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11598 states. [2024-11-02 12:39:26,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11598 to 11562. [2024-11-02 12:39:26,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11562 states, 9923 states have (on average 1.46760052403507) internal successors, (14563), 9957 states have internal predecessors, (14563), 1254 states have call successors, (1254), 385 states have call predecessors, (1254), 384 states have return successors, (1252), 1220 states have call predecessors, (1252), 1252 states have call successors, (1252) [2024-11-02 12:39:26,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11562 states to 11562 states and 17069 transitions. [2024-11-02 12:39:26,897 INFO L78 Accepts]: Start accepts. Automaton has 11562 states and 17069 transitions. Word has length 137 [2024-11-02 12:39:26,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:39:26,899 INFO L471 AbstractCegarLoop]: Abstraction has 11562 states and 17069 transitions. [2024-11-02 12:39:26,900 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2024-11-02 12:39:26,900 INFO L276 IsEmpty]: Start isEmpty. Operand 11562 states and 17069 transitions. [2024-11-02 12:39:26,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2024-11-02 12:39:26,932 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:39:26,933 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:39:26,957 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2024-11-02 12:39:27,137 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:39:27,137 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:39:27,138 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:39:27,138 INFO L85 PathProgramCache]: Analyzing trace with hash -246908010, now seen corresponding path program 1 times [2024-11-02 12:39:27,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:39:27,139 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342674706] [2024-11-02 12:39:27,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:27,140 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:39:27,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:27,344 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2024-11-02 12:39:27,344 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:39:27,345 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1342674706] [2024-11-02 12:39:27,345 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1342674706] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:39:27,345 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [201470111] [2024-11-02 12:39:27,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:27,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:39:27,346 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:39:27,348 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:39:27,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-02 12:39:27,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:27,607 INFO L255 TraceCheckSpWp]: Trace formula consists of 849 conjuncts, 2 conjuncts are in the unsatisfiable core [2024-11-02 12:39:27,610 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:39:27,649 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2024-11-02 12:39:27,649 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-02 12:39:27,649 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [201470111] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:39:27,649 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-02 12:39:27,650 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 4 [2024-11-02 12:39:27,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268955607] [2024-11-02 12:39:27,650 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:39:27,651 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-02 12:39:27,651 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:39:27,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-02 12:39:27,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-02 12:39:27,652 INFO L87 Difference]: Start difference. First operand 11562 states and 17069 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2024-11-02 12:39:28,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:39:28,583 INFO L93 Difference]: Finished difference Result 34483 states and 51670 transitions. [2024-11-02 12:39:28,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-02 12:39:28,584 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2024-11-02 12:39:28,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:39:28,708 INFO L225 Difference]: With dead ends: 34483 [2024-11-02 12:39:28,708 INFO L226 Difference]: Without dead ends: 22926 [2024-11-02 12:39:28,752 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-02 12:39:28,753 INFO L432 NwaCegarLoop]: 256 mSDtfsCounter, 274 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 274 SdHoareTripleChecker+Valid, 503 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-02 12:39:28,754 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [274 Valid, 503 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-02 12:39:28,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22926 states. [2024-11-02 12:39:29,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22926 to 22858. [2024-11-02 12:39:29,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22858 states, 19651 states have (on average 1.4624701033026308) internal successors, (28739), 19717 states have internal predecessors, (28739), 2438 states have call successors, (2438), 769 states have call predecessors, (2438), 768 states have return successors, (2436), 2372 states have call predecessors, (2436), 2436 states have call successors, (2436) [2024-11-02 12:39:30,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22858 states to 22858 states and 33613 transitions. [2024-11-02 12:39:30,088 INFO L78 Accepts]: Start accepts. Automaton has 22858 states and 33613 transitions. Word has length 137 [2024-11-02 12:39:30,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:39:30,088 INFO L471 AbstractCegarLoop]: Abstraction has 22858 states and 33613 transitions. [2024-11-02 12:39:30,089 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2024-11-02 12:39:30,090 INFO L276 IsEmpty]: Start isEmpty. Operand 22858 states and 33613 transitions. [2024-11-02 12:39:30,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2024-11-02 12:39:30,142 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:39:30,142 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:39:30,166 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2024-11-02 12:39:30,343 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2024-11-02 12:39:30,344 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:39:30,345 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:39:30,345 INFO L85 PathProgramCache]: Analyzing trace with hash -352410954, now seen corresponding path program 1 times [2024-11-02 12:39:30,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:39:30,346 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [32985344] [2024-11-02 12:39:30,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:30,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:39:30,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:30,678 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2024-11-02 12:39:30,678 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:39:30,679 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [32985344] [2024-11-02 12:39:30,679 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [32985344] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:39:30,679 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [952926624] [2024-11-02 12:39:30,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:30,680 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:39:30,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:39:30,682 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:39:30,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-02 12:39:30,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:30,920 INFO L255 TraceCheckSpWp]: Trace formula consists of 843 conjuncts, 2 conjuncts are in the unsatisfiable core [2024-11-02 12:39:30,923 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:39:30,992 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-02 12:39:30,992 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-02 12:39:30,993 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [952926624] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:39:30,993 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-02 12:39:30,993 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 4 [2024-11-02 12:39:30,993 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912959652] [2024-11-02 12:39:30,993 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:39:30,994 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-02 12:39:30,994 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:39:30,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-02 12:39:30,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-02 12:39:30,996 INFO L87 Difference]: Start difference. First operand 22858 states and 33613 transitions. Second operand has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2024-11-02 12:39:32,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:39:32,633 INFO L93 Difference]: Finished difference Result 68179 states and 101718 transitions. [2024-11-02 12:39:32,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-02 12:39:32,634 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2024-11-02 12:39:32,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:39:32,928 INFO L225 Difference]: With dead ends: 68179 [2024-11-02 12:39:32,928 INFO L226 Difference]: Without dead ends: 45326 [2024-11-02 12:39:33,001 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-02 12:39:33,002 INFO L432 NwaCegarLoop]: 256 mSDtfsCounter, 253 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 253 SdHoareTripleChecker+Valid, 503 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-02 12:39:33,003 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [253 Valid, 503 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-02 12:39:33,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45326 states. [2024-11-02 12:39:35,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45326 to 45194. [2024-11-02 12:39:35,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45194 states, 38915 states have (on average 1.4572015932159836) internal successors, (56707), 39045 states have internal predecessors, (56707), 4742 states have call successors, (4742), 1537 states have call predecessors, (4742), 1536 states have return successors, (4740), 4612 states have call predecessors, (4740), 4740 states have call successors, (4740) [2024-11-02 12:39:35,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45194 states to 45194 states and 66189 transitions. [2024-11-02 12:39:35,506 INFO L78 Accepts]: Start accepts. Automaton has 45194 states and 66189 transitions. Word has length 137 [2024-11-02 12:39:35,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:39:35,507 INFO L471 AbstractCegarLoop]: Abstraction has 45194 states and 66189 transitions. [2024-11-02 12:39:35,507 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2024-11-02 12:39:35,507 INFO L276 IsEmpty]: Start isEmpty. Operand 45194 states and 66189 transitions. [2024-11-02 12:39:35,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2024-11-02 12:39:35,597 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:39:35,597 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:39:35,620 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2024-11-02 12:39:35,797 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5b469c5a-b8d9-4f96-8eb0-283e4c56377e/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:39:35,797 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:39:35,798 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:39:35,798 INFO L85 PathProgramCache]: Analyzing trace with hash 1153058710, now seen corresponding path program 1 times [2024-11-02 12:39:35,798 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:39:35,798 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1706639098] [2024-11-02 12:39:35,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:35,799 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:39:35,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:36,655 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2024-11-02 12:39:36,655 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:39:36,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1706639098] [2024-11-02 12:39:36,656 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1706639098] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:39:36,656 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 12:39:36,656 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2024-11-02 12:39:36,658 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323777120] [2024-11-02 12:39:36,658 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:39:36,659 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2024-11-02 12:39:36,659 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:39:36,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2024-11-02 12:39:36,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2024-11-02 12:39:36,660 INFO L87 Difference]: Start difference. First operand 45194 states and 66189 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2024-11-02 12:39:40,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:39:40,511 INFO L93 Difference]: Finished difference Result 145682 states and 214163 transitions. [2024-11-02 12:39:40,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-11-02 12:39:40,673 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 137 [2024-11-02 12:39:40,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted.