./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.10.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.10.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh --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 9102a3dc168a1a089cfcbe45042daf88c4c5eebedf113fc0c98e676c1fbaab5b --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 12:49:48,419 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 12:49:48,485 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 12:49:48,489 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 12:49:48,490 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 12:49:48,514 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 12:49:48,514 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 12:49:48,515 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 12:49:48,515 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 12:49:48,516 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 12:49:48,517 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 12:49:48,517 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 12:49:48,517 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 12:49:48,518 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 12:49:48,518 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 12:49:48,519 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 12:49:48,520 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 12:49:48,520 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 12:49:48,521 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 12:49:48,521 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 12:49:48,522 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 12:49:48,525 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 12:49:48,526 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 12:49:48,527 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 12:49:48,527 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 12:49:48,527 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 12:49:48,527 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 12:49:48,528 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 12:49:48,528 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 12:49:48,529 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 12:49:48,529 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 12:49:48,529 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 12:49:48,530 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 12:49:48,530 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 12:49:48,530 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 12:49:48,530 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 12:49:48,531 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 12:49:48,531 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 12:49:48,531 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 12:49:48,531 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 12:49:48,531 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 12:49:48,532 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 12:49:48,532 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 12:49:48,532 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 12:49:48,532 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 12:49:48,532 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 12:49:48,533 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 12:49:48,533 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_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9102a3dc168a1a089cfcbe45042daf88c4c5eebedf113fc0c98e676c1fbaab5b [2023-12-02 12:49:48,736 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 12:49:48,759 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 12:49:48,761 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 12:49:48,763 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 12:49:48,763 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 12:49:48,764 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/systemc/token_ring.10.cil-1.c [2023-12-02 12:49:51,547 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 12:49:51,756 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 12:49:51,756 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/sv-benchmarks/c/systemc/token_ring.10.cil-1.c [2023-12-02 12:49:51,771 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/data/39a7181cf/afd359e4084c482cbdc9f6109b83fd83/FLAG721037b9b [2023-12-02 12:49:51,785 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/data/39a7181cf/afd359e4084c482cbdc9f6109b83fd83 [2023-12-02 12:49:51,788 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 12:49:51,789 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 12:49:51,791 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 12:49:51,791 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 12:49:51,796 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 12:49:51,797 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 12:49:51" (1/1) ... [2023-12-02 12:49:51,798 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@48f879df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:49:51, skipping insertion in model container [2023-12-02 12:49:51,798 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 12:49:51" (1/1) ... [2023-12-02 12:49:51,857 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 12:49:52,000 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/sv-benchmarks/c/systemc/token_ring.10.cil-1.c[671,684] [2023-12-02 12:49:52,114 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 12:49:52,127 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 12:49:52,139 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/sv-benchmarks/c/systemc/token_ring.10.cil-1.c[671,684] [2023-12-02 12:49:52,192 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 12:49:52,214 INFO L206 MainTranslator]: Completed translation [2023-12-02 12:49:52,215 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:49:52 WrapperNode [2023-12-02 12:49:52,215 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 12:49:52,216 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 12:49:52,216 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 12:49:52,216 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 12:49:52,223 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:49:52" (1/1) ... [2023-12-02 12:49:52,233 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:49:52" (1/1) ... [2023-12-02 12:49:52,268 INFO L138 Inliner]: procedures = 48, calls = 62, calls flagged for inlining = 31, calls inlined = 31, statements flattened = 765 [2023-12-02 12:49:52,268 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 12:49:52,269 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 12:49:52,269 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 12:49:52,269 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 12:49:52,276 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:49:52" (1/1) ... [2023-12-02 12:49:52,276 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:49:52" (1/1) ... [2023-12-02 12:49:52,279 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:49:52" (1/1) ... [2023-12-02 12:49:52,280 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:49:52" (1/1) ... [2023-12-02 12:49:52,291 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:49:52" (1/1) ... [2023-12-02 12:49:52,302 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:49:52" (1/1) ... [2023-12-02 12:49:52,305 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:49:52" (1/1) ... [2023-12-02 12:49:52,309 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:49:52" (1/1) ... [2023-12-02 12:49:52,314 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 12:49:52,316 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 12:49:52,316 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 12:49:52,316 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 12:49:52,317 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:49:52" (1/1) ... [2023-12-02 12:49:52,323 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 12:49:52,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:49:52,346 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 12:49:52,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 12:49:52,383 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 12:49:52,383 INFO L130 BoogieDeclarations]: Found specification of procedure error [2023-12-02 12:49:52,383 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2023-12-02 12:49:52,383 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-12-02 12:49:52,383 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-12-02 12:49:52,384 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-12-02 12:49:52,384 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-12-02 12:49:52,384 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-12-02 12:49:52,384 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-12-02 12:49:52,384 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-12-02 12:49:52,384 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-12-02 12:49:52,385 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-12-02 12:49:52,385 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-12-02 12:49:52,385 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 12:49:52,385 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-12-02 12:49:52,385 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-12-02 12:49:52,385 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 12:49:52,386 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 12:49:52,490 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 12:49:52,492 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 12:49:53,152 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 12:49:53,582 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 12:49:53,582 INFO L309 CfgBuilder]: Removed 13 assume(true) statements. [2023-12-02 12:49:53,584 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 12:49:53 BoogieIcfgContainer [2023-12-02 12:49:53,584 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 12:49:53,587 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 12:49:53,587 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 12:49:53,590 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 12:49:53,591 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 12:49:51" (1/3) ... [2023-12-02 12:49:53,591 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f082f08 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 12:49:53, skipping insertion in model container [2023-12-02 12:49:53,591 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:49:52" (2/3) ... [2023-12-02 12:49:53,592 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f082f08 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 12:49:53, skipping insertion in model container [2023-12-02 12:49:53,592 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 12:49:53" (3/3) ... [2023-12-02 12:49:53,593 INFO L112 eAbstractionObserver]: Analyzing ICFG token_ring.10.cil-1.c [2023-12-02 12:49:53,614 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 12:49:53,614 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 12:49:53,669 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 12:49:53,675 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@4fd0a783, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 12:49:53,675 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 12:49:53,681 INFO L276 IsEmpty]: Start isEmpty. Operand has 183 states, 148 states have (on average 1.5202702702702702) internal successors, (225), 152 states have internal predecessors, (225), 26 states have call successors, (26), 7 states have call predecessors, (26), 7 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2023-12-02 12:49:53,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-12-02 12:49:53,691 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:49:53,691 INFO L195 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] [2023-12-02 12:49:53,692 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:49:53,696 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:49:53,696 INFO L85 PathProgramCache]: Analyzing trace with hash 1322602775, now seen corresponding path program 1 times [2023-12-02 12:49:53,703 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:49:53,703 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [766029673] [2023-12-02 12:49:53,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:49:53,704 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:49:53,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:49:54,102 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 12:49:54,102 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:49:54,103 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [766029673] [2023-12-02 12:49:54,103 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [766029673] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:49:54,103 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:49:54,104 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 12:49:54,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585214039] [2023-12-02 12:49:54,106 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:49:54,110 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 12:49:54,110 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:49:54,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 12:49:54,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 12:49:54,141 INFO L87 Difference]: Start difference. First operand has 183 states, 148 states have (on average 1.5202702702702702) internal successors, (225), 152 states have internal predecessors, (225), 26 states have call successors, (26), 7 states have call predecessors, (26), 7 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) Second operand has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 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) [2023-12-02 12:49:54,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:49:54,609 INFO L93 Difference]: Finished difference Result 525 states and 823 transitions. [2023-12-02 12:49:54,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 12:49:54,612 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 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 61 [2023-12-02 12:49:54,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:49:54,624 INFO L225 Difference]: With dead ends: 525 [2023-12-02 12:49:54,624 INFO L226 Difference]: Without dead ends: 343 [2023-12-02 12:49:54,630 INFO L412 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 [2023-12-02 12:49:54,634 INFO L413 NwaCegarLoop]: 423 mSDtfsCounter, 472 mSDsluCounter, 331 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 472 SdHoareTripleChecker+Valid, 754 SdHoareTripleChecker+Invalid, 281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 12:49:54,635 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [472 Valid, 754 Invalid, 281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 12:49:54,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2023-12-02 12:49:54,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 342. [2023-12-02 12:49:54,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 283 states have (on average 1.469964664310954) internal successors, (416), 286 states have internal predecessors, (416), 46 states have call successors, (46), 13 states have call predecessors, (46), 12 states have return successors, (44), 43 states have call predecessors, (44), 44 states have call successors, (44) [2023-12-02 12:49:54,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 506 transitions. [2023-12-02 12:49:54,705 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 506 transitions. Word has length 61 [2023-12-02 12:49:54,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:49:54,706 INFO L495 AbstractCegarLoop]: Abstraction has 342 states and 506 transitions. [2023-12-02 12:49:54,706 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 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) [2023-12-02 12:49:54,706 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 506 transitions. [2023-12-02 12:49:54,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-12-02 12:49:54,714 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:49:54,715 INFO L195 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, 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] [2023-12-02 12:49:54,715 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 12:49:54,715 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:49:54,716 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:49:54,716 INFO L85 PathProgramCache]: Analyzing trace with hash -2146226429, now seen corresponding path program 1 times [2023-12-02 12:49:54,717 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:49:54,717 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870040481] [2023-12-02 12:49:54,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:49:54,717 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:49:54,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:49:54,973 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 12:49:54,973 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:49:54,974 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870040481] [2023-12-02 12:49:54,974 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1870040481] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:49:54,974 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1702550785] [2023-12-02 12:49:54,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:49:54,974 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:49:54,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:49:54,976 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:49:54,984 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 12:49:55,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:49:55,244 INFO L262 TraceCheckSpWp]: Trace formula consists of 850 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 12:49:55,254 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:49:55,312 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 12:49:55,312 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:49:55,313 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1702550785] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:49:55,313 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:49:55,313 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 12:49:55,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972969144] [2023-12-02 12:49:55,315 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:49:55,316 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:49:55,316 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:49:55,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:49:55,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 12:49:55,318 INFO L87 Difference]: Start difference. First operand 342 states and 506 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 2 states have internal predecessors, (74), 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) [2023-12-02 12:49:55,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:49:55,482 INFO L93 Difference]: Finished difference Result 1009 states and 1517 transitions. [2023-12-02 12:49:55,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:49:55,483 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 2 states have internal predecessors, (74), 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 123 [2023-12-02 12:49:55,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:49:55,497 INFO L225 Difference]: With dead ends: 1009 [2023-12-02 12:49:55,497 INFO L226 Difference]: Without dead ends: 672 [2023-12-02 12:49:55,498 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 12:49:55,500 INFO L413 NwaCegarLoop]: 278 mSDtfsCounter, 244 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 244 SdHoareTripleChecker+Valid, 491 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:49:55,500 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [244 Valid, 491 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:49:55,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 672 states. [2023-12-02 12:49:55,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 672 to 666. [2023-12-02 12:49:55,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 666 states, 557 states have (on average 1.466786355475763) internal successors, (817), 561 states have internal predecessors, (817), 84 states have call successors, (84), 25 states have call predecessors, (84), 24 states have return successors, (82), 80 states have call predecessors, (82), 82 states have call successors, (82) [2023-12-02 12:49:55,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 666 states to 666 states and 983 transitions. [2023-12-02 12:49:55,551 INFO L78 Accepts]: Start accepts. Automaton has 666 states and 983 transitions. Word has length 123 [2023-12-02 12:49:55,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:49:55,552 INFO L495 AbstractCegarLoop]: Abstraction has 666 states and 983 transitions. [2023-12-02 12:49:55,552 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 2 states have internal predecessors, (74), 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) [2023-12-02 12:49:55,552 INFO L276 IsEmpty]: Start isEmpty. Operand 666 states and 983 transitions. [2023-12-02 12:49:55,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-12-02 12:49:55,556 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:49:55,556 INFO L195 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, 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] [2023-12-02 12:49:55,563 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 12:49:55,757 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:49:55,757 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:49:55,758 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:49:55,758 INFO L85 PathProgramCache]: Analyzing trace with hash -767414109, now seen corresponding path program 1 times [2023-12-02 12:49:55,758 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:49:55,758 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1444623694] [2023-12-02 12:49:55,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:49:55,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:49:55,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:49:55,937 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 12:49:55,938 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:49:55,938 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1444623694] [2023-12-02 12:49:55,938 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1444623694] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:49:55,938 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [11643072] [2023-12-02 12:49:55,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:49:55,939 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:49:55,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:49:55,943 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:49:55,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 12:49:56,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:49:56,159 INFO L262 TraceCheckSpWp]: Trace formula consists of 844 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 12:49:56,165 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:49:56,206 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-12-02 12:49:56,206 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:49:56,207 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [11643072] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:49:56,207 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:49:56,207 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 12:49:56,207 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773939997] [2023-12-02 12:49:56,207 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:49:56,208 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:49:56,208 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:49:56,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:49:56,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 12:49:56,209 INFO L87 Difference]: Start difference. First operand 666 states and 983 transitions. Second operand has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 2 states have internal predecessors, (77), 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) [2023-12-02 12:49:56,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:49:56,384 INFO L93 Difference]: Finished difference Result 1975 states and 2962 transitions. [2023-12-02 12:49:56,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:49:56,385 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 2 states have internal predecessors, (77), 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 123 [2023-12-02 12:49:56,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:49:56,395 INFO L225 Difference]: With dead ends: 1975 [2023-12-02 12:49:56,395 INFO L226 Difference]: Without dead ends: 1314 [2023-12-02 12:49:56,398 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 12:49:56,399 INFO L413 NwaCegarLoop]: 276 mSDtfsCounter, 241 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 489 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:49:56,400 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [241 Valid, 489 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:49:56,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1314 states. [2023-12-02 12:49:56,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1314 to 1306. [2023-12-02 12:49:56,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1306 states, 1099 states have (on average 1.462238398544131) internal successors, (1607), 1105 states have internal predecessors, (1607), 158 states have call successors, (158), 49 states have call predecessors, (158), 48 states have return successors, (156), 152 states have call predecessors, (156), 156 states have call successors, (156) [2023-12-02 12:49:56,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1306 states to 1306 states and 1921 transitions. [2023-12-02 12:49:56,473 INFO L78 Accepts]: Start accepts. Automaton has 1306 states and 1921 transitions. Word has length 123 [2023-12-02 12:49:56,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:49:56,474 INFO L495 AbstractCegarLoop]: Abstraction has 1306 states and 1921 transitions. [2023-12-02 12:49:56,474 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 2 states have internal predecessors, (77), 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) [2023-12-02 12:49:56,474 INFO L276 IsEmpty]: Start isEmpty. Operand 1306 states and 1921 transitions. [2023-12-02 12:49:56,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-12-02 12:49:56,478 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:49:56,478 INFO L195 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, 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] [2023-12-02 12:49:56,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-12-02 12:49:56,680 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:49:56,681 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:49:56,681 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:49:56,681 INFO L85 PathProgramCache]: Analyzing trace with hash 2016121603, now seen corresponding path program 1 times [2023-12-02 12:49:56,681 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:49:56,681 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214442933] [2023-12-02 12:49:56,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:49:56,682 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:49:56,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:49:56,839 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 12:49:56,840 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:49:56,840 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1214442933] [2023-12-02 12:49:56,840 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1214442933] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:49:56,840 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1400059211] [2023-12-02 12:49:56,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:49:56,841 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:49:56,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:49:56,857 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:49:56,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 12:49:57,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:49:57,066 INFO L262 TraceCheckSpWp]: Trace formula consists of 838 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 12:49:57,071 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:49:57,118 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 12:49:57,118 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:49:57,119 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1400059211] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:49:57,119 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:49:57,119 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 12:49:57,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188137912] [2023-12-02 12:49:57,119 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:49:57,120 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:49:57,120 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:49:57,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:49:57,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 12:49:57,121 INFO L87 Difference]: Start difference. First operand 1306 states and 1921 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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) [2023-12-02 12:49:57,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:49:57,344 INFO L93 Difference]: Finished difference Result 3883 states and 5802 transitions. [2023-12-02 12:49:57,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:49:57,344 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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 123 [2023-12-02 12:49:57,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:49:57,362 INFO L225 Difference]: With dead ends: 3883 [2023-12-02 12:49:57,362 INFO L226 Difference]: Without dead ends: 2582 [2023-12-02 12:49:57,366 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 12:49:57,368 INFO L413 NwaCegarLoop]: 222 mSDtfsCounter, 229 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 229 SdHoareTripleChecker+Valid, 435 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:49:57,368 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [229 Valid, 435 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:49:57,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2582 states. [2023-12-02 12:49:57,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2582 to 2570. [2023-12-02 12:49:57,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2570 states, 2171 states have (on average 1.4569322892676186) internal successors, (3163), 2181 states have internal predecessors, (3163), 302 states have call successors, (302), 97 states have call predecessors, (302), 96 states have return successors, (300), 292 states have call predecessors, (300), 300 states have call successors, (300) [2023-12-02 12:49:57,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2570 states to 2570 states and 3765 transitions. [2023-12-02 12:49:57,508 INFO L78 Accepts]: Start accepts. Automaton has 2570 states and 3765 transitions. Word has length 123 [2023-12-02 12:49:57,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:49:57,508 INFO L495 AbstractCegarLoop]: Abstraction has 2570 states and 3765 transitions. [2023-12-02 12:49:57,508 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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) [2023-12-02 12:49:57,508 INFO L276 IsEmpty]: Start isEmpty. Operand 2570 states and 3765 transitions. [2023-12-02 12:49:57,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-12-02 12:49:57,515 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:49:57,515 INFO L195 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, 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] [2023-12-02 12:49:57,522 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-12-02 12:49:57,716 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:49:57,716 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:49:57,717 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:49:57,717 INFO L85 PathProgramCache]: Analyzing trace with hash -95582877, now seen corresponding path program 1 times [2023-12-02 12:49:57,717 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:49:57,717 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1171392411] [2023-12-02 12:49:57,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:49:57,717 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:49:57,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:49:57,904 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 12:49:57,905 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:49:57,905 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1171392411] [2023-12-02 12:49:57,905 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1171392411] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:49:57,905 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2034304078] [2023-12-02 12:49:57,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:49:57,906 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:49:57,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:49:57,907 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:49:57,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 12:49:58,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:49:58,128 INFO L262 TraceCheckSpWp]: Trace formula consists of 832 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 12:49:58,132 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:49:58,188 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 12:49:58,188 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:49:58,189 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2034304078] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:49:58,189 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:49:58,189 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 12:49:58,189 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763802983] [2023-12-02 12:49:58,190 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:49:58,190 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:49:58,190 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:49:58,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:49:58,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 12:49:58,192 INFO L87 Difference]: Start difference. First operand 2570 states and 3765 transitions. Second operand has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 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) [2023-12-02 12:49:58,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:49:58,456 INFO L93 Difference]: Finished difference Result 7651 states and 11382 transitions. [2023-12-02 12:49:58,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:49:58,457 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 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 123 [2023-12-02 12:49:58,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:49:58,481 INFO L225 Difference]: With dead ends: 7651 [2023-12-02 12:49:58,481 INFO L226 Difference]: Without dead ends: 5086 [2023-12-02 12:49:58,489 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 12:49:58,490 INFO L413 NwaCegarLoop]: 222 mSDtfsCounter, 235 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 235 SdHoareTripleChecker+Valid, 435 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:49:58,490 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [235 Valid, 435 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:49:58,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5086 states. [2023-12-02 12:49:58,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5086 to 5066. [2023-12-02 12:49:58,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5066 states, 4291 states have (on average 1.4511768818457236) internal successors, (6227), 4309 states have internal predecessors, (6227), 582 states have call successors, (582), 193 states have call predecessors, (582), 192 states have return successors, (580), 564 states have call predecessors, (580), 580 states have call successors, (580) [2023-12-02 12:49:58,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5066 states to 5066 states and 7389 transitions. [2023-12-02 12:49:58,702 INFO L78 Accepts]: Start accepts. Automaton has 5066 states and 7389 transitions. Word has length 123 [2023-12-02 12:49:58,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:49:58,703 INFO L495 AbstractCegarLoop]: Abstraction has 5066 states and 7389 transitions. [2023-12-02 12:49:58,703 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 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) [2023-12-02 12:49:58,703 INFO L276 IsEmpty]: Start isEmpty. Operand 5066 states and 7389 transitions. [2023-12-02 12:49:58,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-12-02 12:49:58,713 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:49:58,713 INFO L195 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, 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] [2023-12-02 12:49:58,718 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 12:49:58,915 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:49:58,915 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:49:58,915 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:49:58,916 INFO L85 PathProgramCache]: Analyzing trace with hash 436744131, now seen corresponding path program 1 times [2023-12-02 12:49:58,916 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:49:58,916 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1245302137] [2023-12-02 12:49:58,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:49:58,916 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:49:58,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:49:59,063 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 12:49:59,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:49:59,064 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1245302137] [2023-12-02 12:49:59,064 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1245302137] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:49:59,064 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [564657557] [2023-12-02 12:49:59,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:49:59,064 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:49:59,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:49:59,065 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:49:59,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 12:49:59,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:49:59,295 INFO L262 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 12:49:59,299 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:49:59,354 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 12:49:59,354 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:49:59,354 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [564657557] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:49:59,354 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:49:59,354 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 12:49:59,355 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320308041] [2023-12-02 12:49:59,355 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:49:59,355 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:49:59,355 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:49:59,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:49:59,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 12:49:59,356 INFO L87 Difference]: Start difference. First operand 5066 states and 7389 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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) [2023-12-02 12:49:59,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:49:59,785 INFO L93 Difference]: Finished difference Result 15091 states and 22342 transitions. [2023-12-02 12:49:59,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:49:59,786 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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 123 [2023-12-02 12:49:59,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:49:59,850 INFO L225 Difference]: With dead ends: 15091 [2023-12-02 12:49:59,850 INFO L226 Difference]: Without dead ends: 10030 [2023-12-02 12:49:59,865 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 12:49:59,866 INFO L413 NwaCegarLoop]: 222 mSDtfsCounter, 223 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 435 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:49:59,866 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [223 Valid, 435 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:49:59,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10030 states. [2023-12-02 12:50:00,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10030 to 9994. [2023-12-02 12:50:00,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9994 states, 8483 states have (on average 1.4451255452080631) internal successors, (12259), 8517 states have internal predecessors, (12259), 1126 states have call successors, (1126), 385 states have call predecessors, (1126), 384 states have return successors, (1124), 1092 states have call predecessors, (1124), 1124 states have call successors, (1124) [2023-12-02 12:50:00,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9994 states to 9994 states and 14509 transitions. [2023-12-02 12:50:00,441 INFO L78 Accepts]: Start accepts. Automaton has 9994 states and 14509 transitions. Word has length 123 [2023-12-02 12:50:00,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:50:00,441 INFO L495 AbstractCegarLoop]: Abstraction has 9994 states and 14509 transitions. [2023-12-02 12:50:00,441 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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) [2023-12-02 12:50:00,442 INFO L276 IsEmpty]: Start isEmpty. Operand 9994 states and 14509 transitions. [2023-12-02 12:50:00,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-12-02 12:50:00,460 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:50:00,461 INFO L195 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, 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] [2023-12-02 12:50:00,467 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-12-02 12:50:00,661 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:50:00,661 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:50:00,662 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:50:00,662 INFO L85 PathProgramCache]: Analyzing trace with hash -1884853725, now seen corresponding path program 1 times [2023-12-02 12:50:00,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:50:00,662 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [650530496] [2023-12-02 12:50:00,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:50:00,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:50:00,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:50:01,211 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-12-02 12:50:01,211 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:50:01,211 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [650530496] [2023-12-02 12:50:01,211 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [650530496] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:50:01,211 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:50:01,211 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-12-02 12:50:01,212 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275873091] [2023-12-02 12:50:01,212 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:50:01,212 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 12:50:01,212 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:50:01,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 12:50:01,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 12:50:01,213 INFO L87 Difference]: Start difference. First operand 9994 states and 14509 transitions. Second operand has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 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) [2023-12-02 12:50:02,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:50:02,197 INFO L93 Difference]: Finished difference Result 25378 states and 37075 transitions. [2023-12-02 12:50:02,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 12:50:02,198 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 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 123 [2023-12-02 12:50:02,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:50:02,279 INFO L225 Difference]: With dead ends: 25378 [2023-12-02 12:50:02,279 INFO L226 Difference]: Without dead ends: 15390 [2023-12-02 12:50:02,306 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-12-02 12:50:02,307 INFO L413 NwaCegarLoop]: 225 mSDtfsCounter, 710 mSDsluCounter, 415 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 716 SdHoareTripleChecker+Valid, 640 SdHoareTripleChecker+Invalid, 382 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 12:50:02,307 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [716 Valid, 640 Invalid, 382 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 264 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 12:50:02,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15390 states. [2023-12-02 12:50:03,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15390 to 14858. [2023-12-02 12:50:03,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14858 states, 12611 states have (on average 1.440250574894933) internal successors, (18163), 12661 states have internal predecessors, (18163), 1670 states have call successors, (1670), 577 states have call predecessors, (1670), 576 states have return successors, (1668), 1620 states have call predecessors, (1668), 1668 states have call successors, (1668) [2023-12-02 12:50:03,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14858 states to 14858 states and 21501 transitions. [2023-12-02 12:50:03,219 INFO L78 Accepts]: Start accepts. Automaton has 14858 states and 21501 transitions. Word has length 123 [2023-12-02 12:50:03,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:50:03,220 INFO L495 AbstractCegarLoop]: Abstraction has 14858 states and 21501 transitions. [2023-12-02 12:50:03,221 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 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) [2023-12-02 12:50:03,221 INFO L276 IsEmpty]: Start isEmpty. Operand 14858 states and 21501 transitions. [2023-12-02 12:50:03,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2023-12-02 12:50:03,248 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:50:03,248 INFO L195 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, 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] [2023-12-02 12:50:03,248 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-12-02 12:50:03,249 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:50:03,249 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:50:03,249 INFO L85 PathProgramCache]: Analyzing trace with hash 1336392030, now seen corresponding path program 1 times [2023-12-02 12:50:03,249 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:50:03,249 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [99845286] [2023-12-02 12:50:03,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:50:03,249 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:50:03,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:50:03,736 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-12-02 12:50:03,737 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:50:03,737 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [99845286] [2023-12-02 12:50:03,737 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [99845286] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:50:03,737 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:50:03,737 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-12-02 12:50:03,737 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766925983] [2023-12-02 12:50:03,737 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:50:03,738 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 12:50:03,738 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:50:03,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 12:50:03,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 12:50:03,739 INFO L87 Difference]: Start difference. First operand 14858 states and 21501 transitions. Second operand has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 states have internal predecessors, (73), 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) [2023-12-02 12:50:04,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:50:04,961 INFO L93 Difference]: Finished difference Result 37378 states and 54451 transitions. [2023-12-02 12:50:04,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 12:50:04,962 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 states have internal predecessors, (73), 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 125 [2023-12-02 12:50:04,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:50:05,056 INFO L225 Difference]: With dead ends: 37378 [2023-12-02 12:50:05,056 INFO L226 Difference]: Without dead ends: 22526 [2023-12-02 12:50:05,099 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-12-02 12:50:05,100 INFO L413 NwaCegarLoop]: 204 mSDtfsCounter, 715 mSDsluCounter, 388 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 721 SdHoareTripleChecker+Valid, 592 SdHoareTripleChecker+Invalid, 377 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 12:50:05,100 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [721 Valid, 592 Invalid, 377 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [139 Valid, 238 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 12:50:05,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22526 states. [2023-12-02 12:50:06,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22526 to 22090. [2023-12-02 12:50:06,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22090 states, 18747 states have (on average 1.4352696431429028) internal successors, (26907), 18821 states have internal predecessors, (26907), 2478 states have call successors, (2478), 865 states have call predecessors, (2478), 864 states have return successors, (2476), 2404 states have call predecessors, (2476), 2476 states have call successors, (2476) [2023-12-02 12:50:06,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22090 states to 22090 states and 31861 transitions. [2023-12-02 12:50:06,253 INFO L78 Accepts]: Start accepts. Automaton has 22090 states and 31861 transitions. Word has length 125 [2023-12-02 12:50:06,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:50:06,253 INFO L495 AbstractCegarLoop]: Abstraction has 22090 states and 31861 transitions. [2023-12-02 12:50:06,253 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 states have internal predecessors, (73), 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) [2023-12-02 12:50:06,254 INFO L276 IsEmpty]: Start isEmpty. Operand 22090 states and 31861 transitions. [2023-12-02 12:50:06,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2023-12-02 12:50:06,288 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:50:06,289 INFO L195 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, 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] [2023-12-02 12:50:06,289 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-12-02 12:50:06,289 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:50:06,289 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:50:06,289 INFO L85 PathProgramCache]: Analyzing trace with hash -1768684391, now seen corresponding path program 1 times [2023-12-02 12:50:06,289 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:50:06,289 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124637322] [2023-12-02 12:50:06,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:50:06,290 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:50:06,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:50:06,600 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-12-02 12:50:06,600 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:50:06,600 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1124637322] [2023-12-02 12:50:06,600 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1124637322] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:50:06,600 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:50:06,600 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-12-02 12:50:06,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842524316] [2023-12-02 12:50:06,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:50:06,601 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 12:50:06,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:50:06,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 12:50:06,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 12:50:06,602 INFO L87 Difference]: Start difference. First operand 22090 states and 31861 transitions. Second operand has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 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) [2023-12-02 12:50:08,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:50:08,585 INFO L93 Difference]: Finished difference Result 70986 states and 103003 transitions. [2023-12-02 12:50:08,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 12:50:08,585 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 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 127 [2023-12-02 12:50:08,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:50:08,720 INFO L225 Difference]: With dead ends: 70986 [2023-12-02 12:50:08,720 INFO L226 Difference]: Without dead ends: 48902 [2023-12-02 12:50:08,765 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-12-02 12:50:08,766 INFO L413 NwaCegarLoop]: 251 mSDtfsCounter, 748 mSDsluCounter, 568 mSDsCounter, 0 mSdLazyCounter, 364 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 767 SdHoareTripleChecker+Valid, 819 SdHoareTripleChecker+Invalid, 465 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 364 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 12:50:08,767 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [767 Valid, 819 Invalid, 465 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 364 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 12:50:08,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48902 states. [2023-12-02 12:50:10,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48902 to 43306. [2023-12-02 12:50:10,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43306 states, 36771 states have (on average 1.4281634984090723) internal successors, (52515), 36917 states have internal predecessors, (52515), 4806 states have call successors, (4806), 1729 states have call predecessors, (4806), 1728 states have return successors, (4804), 4660 states have call predecessors, (4804), 4804 states have call successors, (4804) [2023-12-02 12:50:10,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43306 states to 43306 states and 62125 transitions. [2023-12-02 12:50:10,475 INFO L78 Accepts]: Start accepts. Automaton has 43306 states and 62125 transitions. Word has length 127 [2023-12-02 12:50:10,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:50:10,475 INFO L495 AbstractCegarLoop]: Abstraction has 43306 states and 62125 transitions. [2023-12-02 12:50:10,475 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 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) [2023-12-02 12:50:10,476 INFO L276 IsEmpty]: Start isEmpty. Operand 43306 states and 62125 transitions. [2023-12-02 12:50:10,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2023-12-02 12:50:10,536 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:50:10,536 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 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, 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] [2023-12-02 12:50:10,536 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-12-02 12:50:10,536 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:50:10,537 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:50:10,537 INFO L85 PathProgramCache]: Analyzing trace with hash -1549858538, now seen corresponding path program 1 times [2023-12-02 12:50:10,537 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:50:10,537 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [475411345] [2023-12-02 12:50:10,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:50:10,537 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:50:10,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:50:10,817 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 10 proven. 35 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 12:50:10,817 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:50:10,817 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [475411345] [2023-12-02 12:50:10,817 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [475411345] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:50:10,818 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [884323498] [2023-12-02 12:50:10,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:50:10,818 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:50:10,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:50:10,819 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:50:10,822 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 12:50:11,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:50:11,027 INFO L262 TraceCheckSpWp]: Trace formula consists of 882 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 12:50:11,031 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:50:11,069 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 30 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 12:50:11,069 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:50:11,069 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [884323498] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:50:11,069 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:50:11,069 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 12:50:11,070 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197672801] [2023-12-02 12:50:11,070 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:50:11,070 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:50:11,070 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:50:11,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:50:11,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:50:11,072 INFO L87 Difference]: Start difference. First operand 43306 states and 62125 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 12:50:13,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:50:13,209 INFO L93 Difference]: Finished difference Result 77462 states and 112408 transitions. [2023-12-02 12:50:13,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:50:13,209 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 152 [2023-12-02 12:50:13,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:50:13,398 INFO L225 Difference]: With dead ends: 77462 [2023-12-02 12:50:13,399 INFO L226 Difference]: Without dead ends: 55234 [2023-12-02 12:50:13,446 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:50:13,447 INFO L413 NwaCegarLoop]: 346 mSDtfsCounter, 113 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 579 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:50:13,448 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [113 Valid, 579 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:50:13,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55234 states. [2023-12-02 12:50:15,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55234 to 52114. [2023-12-02 12:50:15,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52114 states, 45291 states have (on average 1.4541299595946215) internal successors, (65859), 45437 states have internal predecessors, (65859), 4950 states have call successors, (4950), 1873 states have call predecessors, (4950), 1872 states have return successors, (4948), 4804 states have call predecessors, (4948), 4948 states have call successors, (4948) [2023-12-02 12:50:15,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52114 states to 52114 states and 75757 transitions. [2023-12-02 12:50:15,830 INFO L78 Accepts]: Start accepts. Automaton has 52114 states and 75757 transitions. Word has length 152 [2023-12-02 12:50:15,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:50:15,830 INFO L495 AbstractCegarLoop]: Abstraction has 52114 states and 75757 transitions. [2023-12-02 12:50:15,831 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 12:50:15,831 INFO L276 IsEmpty]: Start isEmpty. Operand 52114 states and 75757 transitions. [2023-12-02 12:50:15,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2023-12-02 12:50:15,882 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:50:15,883 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1] [2023-12-02 12:50:15,889 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-12-02 12:50:16,083 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:50:16,083 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:50:16,084 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:50:16,084 INFO L85 PathProgramCache]: Analyzing trace with hash -566374278, now seen corresponding path program 1 times [2023-12-02 12:50:16,084 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:50:16,084 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [327810601] [2023-12-02 12:50:16,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:50:16,084 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:50:16,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:50:16,634 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 10 proven. 69 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2023-12-02 12:50:16,634 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:50:16,634 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [327810601] [2023-12-02 12:50:16,635 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [327810601] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:50:16,635 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578767781] [2023-12-02 12:50:16,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:50:16,635 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:50:16,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:50:16,637 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:50:16,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 12:50:16,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:50:16,928 INFO L262 TraceCheckSpWp]: Trace formula consists of 1109 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 12:50:16,935 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:50:17,112 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 87 proven. 0 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-12-02 12:50:17,112 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:50:17,113 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1578767781] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:50:17,113 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:50:17,113 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2023-12-02 12:50:17,113 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295953235] [2023-12-02 12:50:17,113 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:50:17,114 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:50:17,114 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:50:17,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:50:17,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:50:17,115 INFO L87 Difference]: Start difference. First operand 52114 states and 75757 transitions. Second operand has 3 states, 3 states have (on average 41.333333333333336) internal successors, (124), 2 states have internal predecessors, (124), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 12:50:20,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:50:20,396 INFO L93 Difference]: Finished difference Result 155467 states and 228598 transitions. [2023-12-02 12:50:20,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:50:20,396 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 41.333333333333336) internal successors, (124), 2 states have internal predecessors, (124), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 197 [2023-12-02 12:50:20,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:50:20,773 INFO L225 Difference]: With dead ends: 155467 [2023-12-02 12:50:20,773 INFO L226 Difference]: Without dead ends: 103358 [2023-12-02 12:50:20,839 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 199 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:50:20,840 INFO L413 NwaCegarLoop]: 222 mSDtfsCounter, 171 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 435 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:50:20,840 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [171 Valid, 435 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:50:20,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103358 states. [2023-12-02 12:50:24,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103358 to 102922. [2023-12-02 12:50:24,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102922 states, 89571 states have (on average 1.448002143550926) internal successors, (129699), 89861 states have internal predecessors, (129699), 9606 states have call successors, (9606), 3745 states have call predecessors, (9606), 3744 states have return successors, (9604), 9316 states have call predecessors, (9604), 9604 states have call successors, (9604) [2023-12-02 12:50:25,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102922 states to 102922 states and 148909 transitions. [2023-12-02 12:50:25,063 INFO L78 Accepts]: Start accepts. Automaton has 102922 states and 148909 transitions. Word has length 197 [2023-12-02 12:50:25,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:50:25,063 INFO L495 AbstractCegarLoop]: Abstraction has 102922 states and 148909 transitions. [2023-12-02 12:50:25,063 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 41.333333333333336) internal successors, (124), 2 states have internal predecessors, (124), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 12:50:25,063 INFO L276 IsEmpty]: Start isEmpty. Operand 102922 states and 148909 transitions. [2023-12-02 12:50:25,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2023-12-02 12:50:25,180 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:50:25,180 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1] [2023-12-02 12:50:25,187 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-12-02 12:50:25,380 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:50:25,381 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:50:25,381 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:50:25,381 INFO L85 PathProgramCache]: Analyzing trace with hash -1384037476, now seen corresponding path program 1 times [2023-12-02 12:50:25,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:50:25,381 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1064149475] [2023-12-02 12:50:25,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:50:25,381 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:50:25,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:50:25,619 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 10 proven. 69 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2023-12-02 12:50:25,619 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:50:25,620 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1064149475] [2023-12-02 12:50:25,620 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1064149475] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:50:25,620 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [660391157] [2023-12-02 12:50:25,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:50:25,620 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:50:25,620 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:50:25,621 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:50:25,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 12:50:25,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:50:25,850 INFO L262 TraceCheckSpWp]: Trace formula consists of 1109 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 12:50:25,854 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:50:25,998 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 91 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-12-02 12:50:25,998 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:50:25,998 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [660391157] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:50:25,998 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:50:25,998 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2023-12-02 12:50:25,999 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298195296] [2023-12-02 12:50:25,999 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:50:25,999 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:50:25,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:50:26,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:50:26,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:50:26,000 INFO L87 Difference]: Start difference. First operand 102922 states and 148909 transitions. Second operand has 3 states, 3 states have (on average 42.666666666666664) internal successors, (128), 2 states have internal predecessors, (128), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 12:50:32,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:50:32,518 INFO L93 Difference]: Finished difference Result 307027 states and 449110 transitions. [2023-12-02 12:50:32,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:50:32,519 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 42.666666666666664) internal successors, (128), 2 states have internal predecessors, (128), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 197 [2023-12-02 12:50:32,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:50:33,010 INFO L225 Difference]: With dead ends: 307027 [2023-12-02 12:50:33,010 INFO L226 Difference]: Without dead ends: 204110 [2023-12-02 12:50:33,140 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 199 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:50:33,141 INFO L413 NwaCegarLoop]: 222 mSDtfsCounter, 171 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 435 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:50:33,141 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [171 Valid, 435 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:50:33,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204110 states. [2023-12-02 12:50:40,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204110 to 203242. [2023-12-02 12:50:40,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203242 states, 177123 states have (on average 1.441726935519385) internal successors, (255363), 177701 states have internal predecessors, (255363), 18630 states have call successors, (18630), 7489 states have call predecessors, (18630), 7488 states have return successors, (18628), 18052 states have call predecessors, (18628), 18628 states have call successors, (18628) [2023-12-02 12:50:41,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203242 states to 203242 states and 292621 transitions. [2023-12-02 12:50:41,370 INFO L78 Accepts]: Start accepts. Automaton has 203242 states and 292621 transitions. Word has length 197 [2023-12-02 12:50:41,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:50:41,370 INFO L495 AbstractCegarLoop]: Abstraction has 203242 states and 292621 transitions. [2023-12-02 12:50:41,370 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 42.666666666666664) internal successors, (128), 2 states have internal predecessors, (128), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 12:50:41,370 INFO L276 IsEmpty]: Start isEmpty. Operand 203242 states and 292621 transitions. [2023-12-02 12:50:41,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2023-12-02 12:50:41,619 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:50:41,620 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1] [2023-12-02 12:50:41,626 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 12:50:41,820 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:50:41,820 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:50:41,821 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:50:41,821 INFO L85 PathProgramCache]: Analyzing trace with hash -248951054, now seen corresponding path program 1 times [2023-12-02 12:50:41,821 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:50:41,821 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1660114433] [2023-12-02 12:50:41,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:50:41,821 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:50:42,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:50:42,389 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 10 proven. 69 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2023-12-02 12:50:42,390 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:50:42,390 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1660114433] [2023-12-02 12:50:42,390 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1660114433] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:50:42,390 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1826479463] [2023-12-02 12:50:42,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:50:42,390 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:50:42,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:50:42,391 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:50:42,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 12:50:42,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:50:42,600 INFO L262 TraceCheckSpWp]: Trace formula consists of 1109 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 12:50:42,603 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:50:42,752 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 95 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-12-02 12:50:42,752 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:50:42,752 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1826479463] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:50:42,753 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:50:42,753 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2023-12-02 12:50:42,753 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936229777] [2023-12-02 12:50:42,753 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:50:42,754 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:50:42,754 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:50:42,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:50:42,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:50:42,755 INFO L87 Difference]: Start difference. First operand 203242 states and 292621 transitions. Second operand has 3 states, 3 states have (on average 44.0) internal successors, (132), 2 states have internal predecessors, (132), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 12:50:56,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:50:56,382 INFO L93 Difference]: Finished difference Result 606259 states and 882070 transitions. [2023-12-02 12:50:56,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:50:56,382 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 44.0) internal successors, (132), 2 states have internal predecessors, (132), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 197 [2023-12-02 12:50:56,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:50:57,447 INFO L225 Difference]: With dead ends: 606259 [2023-12-02 12:50:57,447 INFO L226 Difference]: Without dead ends: 403022 [2023-12-02 12:50:57,894 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 199 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:50:57,894 INFO L413 NwaCegarLoop]: 222 mSDtfsCounter, 171 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 435 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:50:57,895 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [171 Valid, 435 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:50:58,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403022 states. [2023-12-02 12:51:12,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403022 to 401290. [2023-12-02 12:51:12,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 401290 states, 350211 states have (on average 1.4353032885888792) internal successors, (502659), 351365 states have internal predecessors, (502659), 36102 states have call successors, (36102), 14977 states have call predecessors, (36102), 14976 states have return successors, (36100), 34948 states have call predecessors, (36100), 36100 states have call successors, (36100) [2023-12-02 12:51:14,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 401290 states to 401290 states and 574861 transitions. [2023-12-02 12:51:14,050 INFO L78 Accepts]: Start accepts. Automaton has 401290 states and 574861 transitions. Word has length 197 [2023-12-02 12:51:14,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:51:14,050 INFO L495 AbstractCegarLoop]: Abstraction has 401290 states and 574861 transitions. [2023-12-02 12:51:14,051 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 44.0) internal successors, (132), 2 states have internal predecessors, (132), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 12:51:14,051 INFO L276 IsEmpty]: Start isEmpty. Operand 401290 states and 574861 transitions. [2023-12-02 12:51:15,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2023-12-02 12:51:15,007 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:51:15,007 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1] [2023-12-02 12:51:15,015 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 12:51:15,208 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:51:15,208 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:51:15,208 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:51:15,208 INFO L85 PathProgramCache]: Analyzing trace with hash -524438976, now seen corresponding path program 1 times [2023-12-02 12:51:15,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:51:15,209 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [185186147] [2023-12-02 12:51:15,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:51:15,209 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:51:15,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:51:15,432 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 10 proven. 69 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2023-12-02 12:51:15,432 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:51:15,432 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [185186147] [2023-12-02 12:51:15,432 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [185186147] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:51:15,432 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [653021585] [2023-12-02 12:51:15,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:51:15,432 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:51:15,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:51:15,433 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:51:15,440 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_315322f6-82a2-4ed6-b162-7972767e7bfd/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 12:51:15,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:51:15,643 INFO L262 TraceCheckSpWp]: Trace formula consists of 1109 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 12:51:15,648 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:51:15,764 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 97 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-12-02 12:51:15,764 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:51:15,764 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [653021585] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:51:15,764 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:51:15,764 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2023-12-02 12:51:15,764 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286821547] [2023-12-02 12:51:15,764 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:51:15,765 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:51:15,765 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:51:15,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:51:15,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:51:15,766 INFO L87 Difference]: Start difference. First operand 401290 states and 574861 transitions. Second operand has 3 states, 3 states have (on average 44.666666666666664) internal successors, (134), 2 states have internal predecessors, (134), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 12:51:43,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:51:43,603 INFO L93 Difference]: Finished difference Result 1196947 states and 1731862 transitions. [2023-12-02 12:51:43,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:51:43,604 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 44.666666666666664) internal successors, (134), 2 states have internal predecessors, (134), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 197 [2023-12-02 12:51:43,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:51:46,165 INFO L225 Difference]: With dead ends: 1196947 [2023-12-02 12:51:46,166 INFO L226 Difference]: Without dead ends: 795662 [2023-12-02 12:51:46,891 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 199 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:51:46,892 INFO L413 NwaCegarLoop]: 222 mSDtfsCounter, 171 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 435 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:51:46,892 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [171 Valid, 435 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:51:47,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 795662 states. [2023-12-02 12:52:15,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 795662 to 792202. [2023-12-02 12:52:16,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 792202 states, 692355 states have (on average 1.4287280369174773) internal successors, (989187), 694661 states have internal predecessors, (989187), 69894 states have call successors, (69894), 29953 states have call predecessors, (69894), 29952 states have return successors, (69892), 67588 states have call predecessors, (69892), 69892 states have call successors, (69892)