./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.03.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.03.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash d5746a53d1ab0f7d20d2e5362b7235e80167d7cee80ddadf160c57caf25829fe --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:25:04,246 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:25:04,346 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:25:04,353 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:25:04,354 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:25:04,388 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:25:04,389 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:25:04,389 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:25:04,390 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:25:04,391 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:25:04,392 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:25:04,392 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:25:04,393 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:25:04,394 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:25:04,394 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:25:04,395 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:25:04,396 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:25:04,396 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:25:04,397 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:25:04,398 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:25:04,399 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:25:04,399 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:25:04,401 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:25:04,401 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:25:04,402 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:25:04,403 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:25:04,403 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:25:04,404 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:25:04,405 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:25:04,405 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:25:04,406 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:25:04,406 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:25:04,407 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:25:04,407 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:25:04,408 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:25:04,409 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:25:04,409 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:25:04,410 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:25:04,410 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:25:04,411 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:25:04,411 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:25:04,412 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:25:04,412 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:25:04,413 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:25:04,413 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:25:04,413 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_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d5746a53d1ab0f7d20d2e5362b7235e80167d7cee80ddadf160c57caf25829fe [2023-11-19 05:25:04,724 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:25:04,749 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:25:04,752 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:25:04,754 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:25:04,754 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:25:04,756 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.03.cil-1.c [2023-11-19 05:25:08,177 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:25:08,519 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:25:08,519 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.03.cil-1.c [2023-11-19 05:25:08,536 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/data/66d62a442/d034be1548364788b50c6b0f60f5eb92/FLAGc6b8f0ea5 [2023-11-19 05:25:08,553 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/data/66d62a442/d034be1548364788b50c6b0f60f5eb92 [2023-11-19 05:25:08,556 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:25:08,558 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:25:08,560 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:25:08,560 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:25:08,571 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:25:08,575 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:25:08" (1/1) ... [2023-11-19 05:25:08,577 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1ec80e5d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:25:08, skipping insertion in model container [2023-11-19 05:25:08,577 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:25:08" (1/1) ... [2023-11-19 05:25:08,632 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:25:08,815 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_88232cb7-dd2d-4d44-a74d-c1383f199380/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.03.cil-1.c[913,926] [2023-11-19 05:25:08,861 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_88232cb7-dd2d-4d44-a74d-c1383f199380/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.03.cil-1.c[5977,5990] [2023-11-19 05:25:08,922 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:25:08,956 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:25:08,973 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_88232cb7-dd2d-4d44-a74d-c1383f199380/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.03.cil-1.c[913,926] [2023-11-19 05:25:08,997 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_88232cb7-dd2d-4d44-a74d-c1383f199380/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.03.cil-1.c[5977,5990] [2023-11-19 05:25:09,062 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:25:09,106 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:25:09,107 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:25:09 WrapperNode [2023-11-19 05:25:09,107 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:25:09,108 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:25:09,109 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:25:09,109 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:25:09,118 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:25:09" (1/1) ... [2023-11-19 05:25:09,132 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:25:09" (1/1) ... [2023-11-19 05:25:09,188 INFO L138 Inliner]: procedures = 54, calls = 58, calls flagged for inlining = 28, calls inlined = 28, statements flattened = 551 [2023-11-19 05:25:09,189 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:25:09,190 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:25:09,190 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:25:09,190 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:25:09,201 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:25:09" (1/1) ... [2023-11-19 05:25:09,202 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:25:09" (1/1) ... [2023-11-19 05:25:09,207 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:25:09" (1/1) ... [2023-11-19 05:25:09,207 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:25:09" (1/1) ... [2023-11-19 05:25:09,222 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:25:09" (1/1) ... [2023-11-19 05:25:09,234 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:25:09" (1/1) ... [2023-11-19 05:25:09,239 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:25:09" (1/1) ... [2023-11-19 05:25:09,243 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:25:09" (1/1) ... [2023-11-19 05:25:09,253 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:25:09,254 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:25:09,256 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:25:09,257 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:25:09,263 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:25:09" (1/1) ... [2023-11-19 05:25:09,272 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:25:09,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:25:09,313 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:25:09,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:25:09,371 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:25:09,372 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-11-19 05:25:09,372 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-11-19 05:25:09,372 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify_threads [2023-11-19 05:25:09,372 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify_threads [2023-11-19 05:25:09,373 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2023-11-19 05:25:09,373 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2023-11-19 05:25:09,373 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2023-11-19 05:25:09,374 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2023-11-19 05:25:09,374 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2023-11-19 05:25:09,374 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2023-11-19 05:25:09,374 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2023-11-19 05:25:09,375 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2023-11-19 05:25:09,375 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2023-11-19 05:25:09,375 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2023-11-19 05:25:09,375 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:25:09,376 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2023-11-19 05:25:09,376 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2023-11-19 05:25:09,376 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:25:09,376 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:25:09,377 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2023-11-19 05:25:09,377 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2023-11-19 05:25:09,378 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2023-11-19 05:25:09,378 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2023-11-19 05:25:09,499 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:25:09,502 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:25:10,244 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:25:10,525 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:25:10,525 INFO L302 CfgBuilder]: Removed 10 assume(true) statements. [2023-11-19 05:25:10,537 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:25:10 BoogieIcfgContainer [2023-11-19 05:25:10,537 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:25:10,545 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:25:10,545 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:25:10,549 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:25:10,550 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:25:08" (1/3) ... [2023-11-19 05:25:10,551 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5361f1bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:25:10, skipping insertion in model container [2023-11-19 05:25:10,551 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:25:09" (2/3) ... [2023-11-19 05:25:10,553 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5361f1bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:25:10, skipping insertion in model container [2023-11-19 05:25:10,553 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:25:10" (3/3) ... [2023-11-19 05:25:10,556 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_1.cil-2+token_ring.03.cil-1.c [2023-11-19 05:25:10,580 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:25:10,581 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-11-19 05:25:10,657 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:25:10,665 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;@690cbd5e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:25:10,665 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-11-19 05:25:10,671 INFO L276 IsEmpty]: Start isEmpty. Operand has 150 states, 112 states have (on average 1.5267857142857142) internal successors, (171), 119 states have internal predecessors, (171), 25 states have call successors, (25), 10 states have call predecessors, (25), 10 states have return successors, (25), 23 states have call predecessors, (25), 25 states have call successors, (25) [2023-11-19 05:25:10,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-19 05:25:10,683 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:10,684 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] [2023-11-19 05:25:10,685 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:10,691 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:10,691 INFO L85 PathProgramCache]: Analyzing trace with hash -934280007, now seen corresponding path program 1 times [2023-11-19 05:25:10,703 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:10,704 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1045103400] [2023-11-19 05:25:10,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:10,705 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:10,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:11,150 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:25:11,151 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:11,151 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1045103400] [2023-11-19 05:25:11,152 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1045103400] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:11,152 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:25:11,152 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:25:11,154 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10460344] [2023-11-19 05:25:11,155 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:11,160 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:25:11,160 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:11,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:25:11,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:25:11,214 INFO L87 Difference]: Start difference. First operand has 150 states, 112 states have (on average 1.5267857142857142) internal successors, (171), 119 states have internal predecessors, (171), 25 states have call successors, (25), 10 states have call predecessors, (25), 10 states have return successors, (25), 23 states have call predecessors, (25), 25 states have call successors, (25) Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:25:11,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:11,504 INFO L93 Difference]: Finished difference Result 332 states and 490 transitions. [2023-11-19 05:25:11,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:25:11,507 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2023-11-19 05:25:11,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:11,522 INFO L225 Difference]: With dead ends: 332 [2023-11-19 05:25:11,523 INFO L226 Difference]: Without dead ends: 182 [2023-11-19 05:25:11,529 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:25:11,535 INFO L413 NwaCegarLoop]: 186 mSDtfsCounter, 186 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:11,538 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [186 Valid, 241 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:25:11,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2023-11-19 05:25:11,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 178. [2023-11-19 05:25:11,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 138 states have (on average 1.434782608695652) internal successors, (198), 142 states have internal predecessors, (198), 28 states have call successors, (28), 12 states have call predecessors, (28), 10 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2023-11-19 05:25:11,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 250 transitions. [2023-11-19 05:25:11,671 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 250 transitions. Word has length 28 [2023-11-19 05:25:11,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:11,672 INFO L495 AbstractCegarLoop]: Abstraction has 178 states and 250 transitions. [2023-11-19 05:25:11,672 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:25:11,673 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 250 transitions. [2023-11-19 05:25:11,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-19 05:25:11,678 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:11,678 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] [2023-11-19 05:25:11,679 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:25:11,679 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:11,680 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:11,680 INFO L85 PathProgramCache]: Analyzing trace with hash 288306143, now seen corresponding path program 1 times [2023-11-19 05:25:11,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:11,681 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411131761] [2023-11-19 05:25:11,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:11,682 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:11,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:11,813 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:25:11,814 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:11,814 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411131761] [2023-11-19 05:25:11,814 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [411131761] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:11,814 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:25:11,815 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:25:11,815 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899720372] [2023-11-19 05:25:11,815 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:11,817 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:25:11,818 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:11,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:25:11,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:25:11,827 INFO L87 Difference]: Start difference. First operand 178 states and 250 transitions. Second operand has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:25:11,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:11,968 INFO L93 Difference]: Finished difference Result 334 states and 467 transitions. [2023-11-19 05:25:11,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:25:11,969 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2023-11-19 05:25:11,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:11,978 INFO L225 Difference]: With dead ends: 334 [2023-11-19 05:25:11,978 INFO L226 Difference]: Without dead ends: 253 [2023-11-19 05:25:11,983 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:25:11,985 INFO L413 NwaCegarLoop]: 172 mSDtfsCounter, 184 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 184 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:11,986 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [184 Valid, 225 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:25:11,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2023-11-19 05:25:12,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 249. [2023-11-19 05:25:12,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 198 states have (on average 1.4090909090909092) internal successors, (279), 202 states have internal predecessors, (279), 35 states have call successors, (35), 16 states have call predecessors, (35), 14 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2023-11-19 05:25:12,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 345 transitions. [2023-11-19 05:25:12,049 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 345 transitions. Word has length 29 [2023-11-19 05:25:12,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:12,050 INFO L495 AbstractCegarLoop]: Abstraction has 249 states and 345 transitions. [2023-11-19 05:25:12,051 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:25:12,051 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 345 transitions. [2023-11-19 05:25:12,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-19 05:25:12,060 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:12,060 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] [2023-11-19 05:25:12,060 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 05:25:12,061 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:12,062 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:12,062 INFO L85 PathProgramCache]: Analyzing trace with hash 1594622016, now seen corresponding path program 1 times [2023-11-19 05:25:12,063 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:12,063 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1954998938] [2023-11-19 05:25:12,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:12,064 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:12,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:12,162 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:25:12,163 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:12,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1954998938] [2023-11-19 05:25:12,165 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1954998938] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:12,165 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:25:12,165 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:25:12,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092733795] [2023-11-19 05:25:12,168 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:12,169 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:25:12,175 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:12,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:25:12,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:25:12,177 INFO L87 Difference]: Start difference. First operand 249 states and 345 transitions. Second operand has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:25:12,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:12,308 INFO L93 Difference]: Finished difference Result 489 states and 673 transitions. [2023-11-19 05:25:12,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:25:12,309 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2023-11-19 05:25:12,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:12,316 INFO L225 Difference]: With dead ends: 489 [2023-11-19 05:25:12,316 INFO L226 Difference]: Without dead ends: 337 [2023-11-19 05:25:12,322 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:25:12,329 INFO L413 NwaCegarLoop]: 184 mSDtfsCounter, 46 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 341 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:12,331 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 341 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:25:12,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2023-11-19 05:25:12,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 323. [2023-11-19 05:25:12,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 323 states, 261 states have (on average 1.3946360153256705) internal successors, (364), 267 states have internal predecessors, (364), 41 states have call successors, (41), 21 states have call predecessors, (41), 19 states have return successors, (37), 35 states have call predecessors, (37), 37 states have call successors, (37) [2023-11-19 05:25:12,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 442 transitions. [2023-11-19 05:25:12,384 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 442 transitions. Word has length 30 [2023-11-19 05:25:12,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:12,384 INFO L495 AbstractCegarLoop]: Abstraction has 323 states and 442 transitions. [2023-11-19 05:25:12,385 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:25:12,385 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 442 transitions. [2023-11-19 05:25:12,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-11-19 05:25:12,391 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:12,392 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] [2023-11-19 05:25:12,392 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-19 05:25:12,392 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:12,393 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:12,393 INFO L85 PathProgramCache]: Analyzing trace with hash -1447520622, now seen corresponding path program 1 times [2023-11-19 05:25:12,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:12,394 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1383125494] [2023-11-19 05:25:12,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:12,394 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:12,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:12,590 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:25:12,590 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:12,590 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1383125494] [2023-11-19 05:25:12,591 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1383125494] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:12,591 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:25:12,591 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 05:25:12,591 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064102047] [2023-11-19 05:25:12,592 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:12,592 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:25:12,592 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:12,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:25:12,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:25:12,594 INFO L87 Difference]: Start difference. First operand 323 states and 442 transitions. Second operand has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 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) [2023-11-19 05:25:12,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:12,942 INFO L93 Difference]: Finished difference Result 493 states and 695 transitions. [2023-11-19 05:25:12,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:25:12,943 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 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 41 [2023-11-19 05:25:12,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:12,948 INFO L225 Difference]: With dead ends: 493 [2023-11-19 05:25:12,949 INFO L226 Difference]: Without dead ends: 402 [2023-11-19 05:25:12,950 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 [2023-11-19 05:25:12,951 INFO L413 NwaCegarLoop]: 256 mSDtfsCounter, 289 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 289 SdHoareTripleChecker+Valid, 438 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:12,952 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [289 Valid, 438 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 178 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:25:12,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2023-11-19 05:25:12,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 401. [2023-11-19 05:25:12,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 401 states, 320 states have (on average 1.38125) internal successors, (442), 327 states have internal predecessors, (442), 54 states have call successors, (54), 27 states have call predecessors, (54), 25 states have return successors, (50), 47 states have call predecessors, (50), 50 states have call successors, (50) [2023-11-19 05:25:12,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 401 states to 401 states and 546 transitions. [2023-11-19 05:25:12,998 INFO L78 Accepts]: Start accepts. Automaton has 401 states and 546 transitions. Word has length 41 [2023-11-19 05:25:12,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:12,999 INFO L495 AbstractCegarLoop]: Abstraction has 401 states and 546 transitions. [2023-11-19 05:25:12,999 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 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) [2023-11-19 05:25:13,000 INFO L276 IsEmpty]: Start isEmpty. Operand 401 states and 546 transitions. [2023-11-19 05:25:13,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-11-19 05:25:13,002 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:13,002 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-19 05:25:13,002 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-19 05:25:13,003 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:13,003 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:13,003 INFO L85 PathProgramCache]: Analyzing trace with hash 1512006447, now seen corresponding path program 1 times [2023-11-19 05:25:13,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:13,004 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302491715] [2023-11-19 05:25:13,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:13,004 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:13,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:13,076 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:25:13,076 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:13,076 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302491715] [2023-11-19 05:25:13,077 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1302491715] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:13,077 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:25:13,077 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:25:13,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686853110] [2023-11-19 05:25:13,078 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:13,078 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:25:13,078 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:13,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:25:13,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:25:13,080 INFO L87 Difference]: Start difference. First operand 401 states and 546 transitions. Second operand has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:25:13,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:13,199 INFO L93 Difference]: Finished difference Result 564 states and 764 transitions. [2023-11-19 05:25:13,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:25:13,200 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 43 [2023-11-19 05:25:13,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:13,204 INFO L225 Difference]: With dead ends: 564 [2023-11-19 05:25:13,204 INFO L226 Difference]: Without dead ends: 406 [2023-11-19 05:25:13,205 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:25:13,207 INFO L413 NwaCegarLoop]: 204 mSDtfsCounter, 32 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 373 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:13,207 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 373 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:25:13,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2023-11-19 05:25:13,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 395. [2023-11-19 05:25:13,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 314 states have (on average 1.3630573248407643) internal successors, (428), 321 states have internal predecessors, (428), 54 states have call successors, (54), 27 states have call predecessors, (54), 25 states have return successors, (50), 47 states have call predecessors, (50), 50 states have call successors, (50) [2023-11-19 05:25:13,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 532 transitions. [2023-11-19 05:25:13,249 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 532 transitions. Word has length 43 [2023-11-19 05:25:13,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:13,250 INFO L495 AbstractCegarLoop]: Abstraction has 395 states and 532 transitions. [2023-11-19 05:25:13,251 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:25:13,251 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 532 transitions. [2023-11-19 05:25:13,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-11-19 05:25:13,252 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:13,253 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-19 05:25:13,253 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-19 05:25:13,253 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:13,254 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:13,254 INFO L85 PathProgramCache]: Analyzing trace with hash -272885760, now seen corresponding path program 1 times [2023-11-19 05:25:13,254 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:13,255 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [939197084] [2023-11-19 05:25:13,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:13,255 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:13,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:13,306 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 05:25:13,306 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:13,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [939197084] [2023-11-19 05:25:13,306 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [939197084] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:13,307 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:25:13,307 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:25:13,307 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139521816] [2023-11-19 05:25:13,308 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:13,308 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:25:13,308 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:13,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:25:13,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:25:13,310 INFO L87 Difference]: Start difference. First operand 395 states and 532 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-19 05:25:13,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:13,418 INFO L93 Difference]: Finished difference Result 644 states and 856 transitions. [2023-11-19 05:25:13,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:25:13,419 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 46 [2023-11-19 05:25:13,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:13,422 INFO L225 Difference]: With dead ends: 644 [2023-11-19 05:25:13,422 INFO L226 Difference]: Without dead ends: 441 [2023-11-19 05:25:13,423 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:25:13,424 INFO L413 NwaCegarLoop]: 171 mSDtfsCounter, 169 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:13,425 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [169 Valid, 223 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:25:13,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2023-11-19 05:25:13,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 441. [2023-11-19 05:25:13,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 353 states have (on average 1.3342776203966005) internal successors, (471), 360 states have internal predecessors, (471), 58 states have call successors, (58), 30 states have call predecessors, (58), 28 states have return successors, (54), 51 states have call predecessors, (54), 54 states have call successors, (54) [2023-11-19 05:25:13,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 583 transitions. [2023-11-19 05:25:13,465 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 583 transitions. Word has length 46 [2023-11-19 05:25:13,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:13,466 INFO L495 AbstractCegarLoop]: Abstraction has 441 states and 583 transitions. [2023-11-19 05:25:13,466 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-19 05:25:13,466 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 583 transitions. [2023-11-19 05:25:13,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-11-19 05:25:13,468 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:13,468 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-19 05:25:13,468 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-19 05:25:13,468 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:13,469 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:13,469 INFO L85 PathProgramCache]: Analyzing trace with hash -378340636, now seen corresponding path program 1 times [2023-11-19 05:25:13,469 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:13,469 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2096263335] [2023-11-19 05:25:13,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:13,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:13,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:13,559 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-19 05:25:13,559 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:13,559 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2096263335] [2023-11-19 05:25:13,559 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2096263335] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:13,559 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:25:13,559 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 05:25:13,560 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605537356] [2023-11-19 05:25:13,560 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:13,560 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:25:13,560 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:13,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:25:13,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:25:13,561 INFO L87 Difference]: Start difference. First operand 441 states and 583 transitions. Second operand has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:25:13,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:13,806 INFO L93 Difference]: Finished difference Result 481 states and 630 transitions. [2023-11-19 05:25:13,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:25:13,807 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 47 [2023-11-19 05:25:13,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:13,812 INFO L225 Difference]: With dead ends: 481 [2023-11-19 05:25:13,812 INFO L226 Difference]: Without dead ends: 478 [2023-11-19 05:25:13,813 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:25:13,814 INFO L413 NwaCegarLoop]: 181 mSDtfsCounter, 314 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 314 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:13,814 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [314 Valid, 222 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:25:13,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 478 states. [2023-11-19 05:25:13,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 478 to 440. [2023-11-19 05:25:13,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 440 states, 353 states have (on average 1.3286118980169972) internal successors, (469), 359 states have internal predecessors, (469), 57 states have call successors, (57), 30 states have call predecessors, (57), 28 states have return successors, (54), 51 states have call predecessors, (54), 54 states have call successors, (54) [2023-11-19 05:25:13,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 440 states to 440 states and 580 transitions. [2023-11-19 05:25:13,874 INFO L78 Accepts]: Start accepts. Automaton has 440 states and 580 transitions. Word has length 47 [2023-11-19 05:25:13,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:13,875 INFO L495 AbstractCegarLoop]: Abstraction has 440 states and 580 transitions. [2023-11-19 05:25:13,875 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:25:13,875 INFO L276 IsEmpty]: Start isEmpty. Operand 440 states and 580 transitions. [2023-11-19 05:25:13,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-11-19 05:25:13,877 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:13,877 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-19 05:25:13,877 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-19 05:25:13,878 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:13,878 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:13,878 INFO L85 PathProgramCache]: Analyzing trace with hash 1155577795, now seen corresponding path program 1 times [2023-11-19 05:25:13,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:13,879 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472158373] [2023-11-19 05:25:13,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:13,879 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:13,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:14,108 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-19 05:25:14,108 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:14,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472158373] [2023-11-19 05:25:14,109 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472158373] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:25:14,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1537980207] [2023-11-19 05:25:14,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:14,110 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:14,110 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:25:14,114 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:25:14,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:25:14,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:14,314 INFO L262 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-19 05:25:14,321 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:25:14,618 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:25:14,618 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:25:14,726 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-19 05:25:14,727 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1537980207] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:25:14,727 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1545420453] [2023-11-19 05:25:14,748 INFO L159 IcfgInterpreter]: Started Sifa with 40 locations of interest [2023-11-19 05:25:14,748 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:25:14,752 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:25:14,757 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:25:14,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:25:21,083 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 91 for LOIs [2023-11-19 05:25:21,122 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 116 for LOIs [2023-11-19 05:25:21,183 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify_threads with input of size 116 for LOIs [2023-11-19 05:25:21,841 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:25:33,918 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7876#(and (<= 1 |#StackHeapBarrier|) (= ~q_buf_0~0 0) (= ~t1_pc~0 0) (not (= ~p_num_write~0 1)) (= ~p_last_write~0 0) (= ~T1_E~0 2) (= ~m_st~0 0) (= ~q_free~0 1) (= ~c_last_read~0 0) (<= 0 ~p_num_write~0) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= ~E_3~0 2) (= 0 ~t3_pc~0) (= ~t2_i~0 0) (= ~t1_st~0 0) (= ~c_num_read~0 1) (<= ~p_num_write~0 1) (= ~m_i~0 0) (= ~p_dw_pc~0 1) (= ~q_write_ev~0 2) (= ~E_2~0 2) (= ~p_dw_st~0 0) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (= ~token~0 0) (= ~q_read_ev~0 2) (= ~c_dr_pc~0 0) (= ~m_pc~0 0) (= ~p_dw_i~0 1) (exists ((|v_ULTIMATE.start_eval1_~tmp___0~1#1_BEFORE_CALL_4| Int)) (and (<= |v_ULTIMATE.start_eval1_~tmp___0~1#1_BEFORE_CALL_4| 2147483647) (<= 0 (+ 2147483648 |v_ULTIMATE.start_eval1_~tmp___0~1#1_BEFORE_CALL_4|)) (not (= 0 |v_ULTIMATE.start_eval1_~tmp___0~1#1_BEFORE_CALL_4|)))) (= 0 ~t2_pc~0) (= ~E_M~0 2) (= ~a_t~0 0) (= 0 ~t2_st~0) (= ~E_1~0 2) (= 0 ~t3_st~0) (= ~M_E~0 2) (= ~t1_i~0 0))' at error location [2023-11-19 05:25:33,918 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:25:33,918 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:25:33,919 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 4] total 7 [2023-11-19 05:25:33,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114057594] [2023-11-19 05:25:33,919 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:25:33,920 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 05:25:33,920 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:33,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 05:25:33,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1077, Unknown=0, NotChecked=0, Total=1190 [2023-11-19 05:25:33,922 INFO L87 Difference]: Start difference. First operand 440 states and 580 transitions. Second operand has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2023-11-19 05:25:34,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:34,343 INFO L93 Difference]: Finished difference Result 883 states and 1148 transitions. [2023-11-19 05:25:34,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 05:25:34,344 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 48 [2023-11-19 05:25:34,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:34,354 INFO L225 Difference]: With dead ends: 883 [2023-11-19 05:25:34,354 INFO L226 Difference]: Without dead ends: 880 [2023-11-19 05:25:34,355 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 375 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=113, Invalid=1077, Unknown=0, NotChecked=0, Total=1190 [2023-11-19 05:25:34,357 INFO L413 NwaCegarLoop]: 227 mSDtfsCounter, 290 mSDsluCounter, 638 mSDsCounter, 0 mSdLazyCounter, 359 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 290 SdHoareTripleChecker+Valid, 865 SdHoareTripleChecker+Invalid, 361 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 359 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:34,358 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [290 Valid, 865 Invalid, 361 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 359 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:25:34,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 880 states. [2023-11-19 05:25:34,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 880 to 649. [2023-11-19 05:25:34,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 649 states, 530 states have (on average 1.3245283018867924) internal successors, (702), 538 states have internal predecessors, (702), 76 states have call successors, (76), 43 states have call predecessors, (76), 41 states have return successors, (73), 68 states have call predecessors, (73), 73 states have call successors, (73) [2023-11-19 05:25:34,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 649 states to 649 states and 851 transitions. [2023-11-19 05:25:34,434 INFO L78 Accepts]: Start accepts. Automaton has 649 states and 851 transitions. Word has length 48 [2023-11-19 05:25:34,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:34,435 INFO L495 AbstractCegarLoop]: Abstraction has 649 states and 851 transitions. [2023-11-19 05:25:34,436 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2023-11-19 05:25:34,436 INFO L276 IsEmpty]: Start isEmpty. Operand 649 states and 851 transitions. [2023-11-19 05:25:34,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-11-19 05:25:34,439 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:34,439 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 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] [2023-11-19 05:25:34,470 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-19 05:25:34,663 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:34,663 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:34,664 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:34,664 INFO L85 PathProgramCache]: Analyzing trace with hash -1253647170, now seen corresponding path program 2 times [2023-11-19 05:25:34,664 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:34,664 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503258768] [2023-11-19 05:25:34,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:34,665 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:34,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:34,743 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-19 05:25:34,743 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:34,743 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [503258768] [2023-11-19 05:25:34,743 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [503258768] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:34,744 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:25:34,744 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:25:34,744 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406146334] [2023-11-19 05:25:34,744 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:34,744 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:25:34,744 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:34,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:25:34,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:25:34,745 INFO L87 Difference]: Start difference. First operand 649 states and 851 transitions. Second operand has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-19 05:25:34,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:34,849 INFO L93 Difference]: Finished difference Result 979 states and 1284 transitions. [2023-11-19 05:25:34,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:25:34,850 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 61 [2023-11-19 05:25:34,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:34,854 INFO L225 Difference]: With dead ends: 979 [2023-11-19 05:25:34,854 INFO L226 Difference]: Without dead ends: 591 [2023-11-19 05:25:34,855 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:25:34,856 INFO L413 NwaCegarLoop]: 194 mSDtfsCounter, 182 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:34,856 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [182 Valid, 239 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:25:34,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 591 states. [2023-11-19 05:25:34,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 591 to 582. [2023-11-19 05:25:34,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 582 states, 473 states have (on average 1.3128964059196617) internal successors, (621), 482 states have internal predecessors, (621), 70 states have call successors, (70), 39 states have call predecessors, (70), 37 states have return successors, (67), 61 states have call predecessors, (67), 67 states have call successors, (67) [2023-11-19 05:25:34,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 582 states to 582 states and 758 transitions. [2023-11-19 05:25:34,906 INFO L78 Accepts]: Start accepts. Automaton has 582 states and 758 transitions. Word has length 61 [2023-11-19 05:25:34,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:34,906 INFO L495 AbstractCegarLoop]: Abstraction has 582 states and 758 transitions. [2023-11-19 05:25:34,906 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-19 05:25:34,907 INFO L276 IsEmpty]: Start isEmpty. Operand 582 states and 758 transitions. [2023-11-19 05:25:34,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-11-19 05:25:34,910 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:34,910 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:25:34,910 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-19 05:25:34,910 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:34,911 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:34,911 INFO L85 PathProgramCache]: Analyzing trace with hash 1396817881, now seen corresponding path program 1 times [2023-11-19 05:25:34,911 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:34,911 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [248612824] [2023-11-19 05:25:34,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:34,912 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:34,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:35,037 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-19 05:25:35,038 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:35,038 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [248612824] [2023-11-19 05:25:35,038 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [248612824] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:25:35,038 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1075961641] [2023-11-19 05:25:35,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:35,039 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:35,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:25:35,040 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:25:35,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:25:35,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:35,205 INFO L262 TraceCheckSpWp]: Trace formula consists of 420 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-19 05:25:35,214 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:25:35,289 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-19 05:25:35,290 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:25:35,290 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1075961641] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:35,290 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:25:35,290 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-19 05:25:35,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185903686] [2023-11-19 05:25:35,291 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:35,291 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:25:35,291 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:35,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:25:35,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:25:35,292 INFO L87 Difference]: Start difference. First operand 582 states and 758 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 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) [2023-11-19 05:25:35,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:35,439 INFO L93 Difference]: Finished difference Result 913 states and 1223 transitions. [2023-11-19 05:25:35,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:25:35,440 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 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 75 [2023-11-19 05:25:35,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:35,445 INFO L225 Difference]: With dead ends: 913 [2023-11-19 05:25:35,446 INFO L226 Difference]: Without dead ends: 744 [2023-11-19 05:25:35,447 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:25:35,448 INFO L413 NwaCegarLoop]: 209 mSDtfsCounter, 175 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:35,448 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [175 Valid, 310 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:25:35,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 744 states. [2023-11-19 05:25:35,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 744 to 738. [2023-11-19 05:25:35,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 738 states, 593 states have (on average 1.3220910623946036) internal successors, (784), 603 states have internal predecessors, (784), 94 states have call successors, (94), 51 states have call predecessors, (94), 49 states have return successors, (91), 84 states have call predecessors, (91), 91 states have call successors, (91) [2023-11-19 05:25:35,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 738 states to 738 states and 969 transitions. [2023-11-19 05:25:35,521 INFO L78 Accepts]: Start accepts. Automaton has 738 states and 969 transitions. Word has length 75 [2023-11-19 05:25:35,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:35,521 INFO L495 AbstractCegarLoop]: Abstraction has 738 states and 969 transitions. [2023-11-19 05:25:35,522 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 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) [2023-11-19 05:25:35,522 INFO L276 IsEmpty]: Start isEmpty. Operand 738 states and 969 transitions. [2023-11-19 05:25:35,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-11-19 05:25:35,525 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:35,525 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:25:35,544 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-19 05:25:35,738 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-19 05:25:35,739 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:35,739 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:35,740 INFO L85 PathProgramCache]: Analyzing trace with hash -53268521, now seen corresponding path program 1 times [2023-11-19 05:25:35,740 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:35,740 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603844400] [2023-11-19 05:25:35,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:35,740 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:35,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:36,135 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-19 05:25:36,136 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:36,136 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603844400] [2023-11-19 05:25:36,136 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [603844400] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:36,136 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:25:36,136 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-19 05:25:36,136 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913785145] [2023-11-19 05:25:36,137 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:36,137 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:25:36,137 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:36,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:25:36,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:25:36,138 INFO L87 Difference]: Start difference. First operand 738 states and 969 transitions. Second operand has 6 states, 6 states have (on average 7.333333333333333) internal successors, (44), 6 states have internal predecessors, (44), 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) [2023-11-19 05:25:36,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:36,663 INFO L93 Difference]: Finished difference Result 1412 states and 1891 transitions. [2023-11-19 05:25:36,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:25:36,663 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.333333333333333) internal successors, (44), 6 states have internal predecessors, (44), 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 75 [2023-11-19 05:25:36,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:36,673 INFO L225 Difference]: With dead ends: 1412 [2023-11-19 05:25:36,673 INFO L226 Difference]: Without dead ends: 1088 [2023-11-19 05:25:36,675 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2023-11-19 05:25:36,675 INFO L413 NwaCegarLoop]: 175 mSDtfsCounter, 378 mSDsluCounter, 266 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 394 SdHoareTripleChecker+Valid, 441 SdHoareTripleChecker+Invalid, 328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:36,676 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [394 Valid, 441 Invalid, 328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-19 05:25:36,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1088 states. [2023-11-19 05:25:36,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1088 to 1034. [2023-11-19 05:25:36,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1034 states, 819 states have (on average 1.326007326007326) internal successors, (1086), 831 states have internal predecessors, (1086), 140 states have call successors, (140), 75 states have call predecessors, (140), 73 states have return successors, (137), 128 states have call predecessors, (137), 137 states have call successors, (137) [2023-11-19 05:25:36,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1034 states to 1034 states and 1363 transitions. [2023-11-19 05:25:36,789 INFO L78 Accepts]: Start accepts. Automaton has 1034 states and 1363 transitions. Word has length 75 [2023-11-19 05:25:36,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:36,790 INFO L495 AbstractCegarLoop]: Abstraction has 1034 states and 1363 transitions. [2023-11-19 05:25:36,790 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.333333333333333) internal successors, (44), 6 states have internal predecessors, (44), 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) [2023-11-19 05:25:36,790 INFO L276 IsEmpty]: Start isEmpty. Operand 1034 states and 1363 transitions. [2023-11-19 05:25:36,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-11-19 05:25:36,794 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:36,794 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:25:36,794 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-19 05:25:36,794 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:36,795 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:36,795 INFO L85 PathProgramCache]: Analyzing trace with hash -418630777, now seen corresponding path program 1 times [2023-11-19 05:25:36,795 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:36,795 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1372890263] [2023-11-19 05:25:36,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:36,795 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:36,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:37,022 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-19 05:25:37,023 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:37,023 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1372890263] [2023-11-19 05:25:37,023 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1372890263] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:25:37,023 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1884244592] [2023-11-19 05:25:37,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:37,023 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:37,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:25:37,025 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:25:37,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:25:37,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:37,190 INFO L262 TraceCheckSpWp]: Trace formula consists of 445 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-19 05:25:37,204 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:25:37,233 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-19 05:25:37,233 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:25:37,233 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1884244592] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:37,233 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:25:37,233 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-19 05:25:37,234 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1300563262] [2023-11-19 05:25:37,234 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:37,234 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:25:37,234 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:37,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:25:37,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:25:37,235 INFO L87 Difference]: Start difference. First operand 1034 states and 1363 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 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) [2023-11-19 05:25:37,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:37,416 INFO L93 Difference]: Finished difference Result 1524 states and 2036 transitions. [2023-11-19 05:25:37,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:25:37,417 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 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 89 [2023-11-19 05:25:37,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:37,425 INFO L225 Difference]: With dead ends: 1524 [2023-11-19 05:25:37,426 INFO L226 Difference]: Without dead ends: 1196 [2023-11-19 05:25:37,427 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:25:37,428 INFO L413 NwaCegarLoop]: 221 mSDtfsCounter, 47 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 392 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:37,429 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 392 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:25:37,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1196 states. [2023-11-19 05:25:37,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1196 to 1128. [2023-11-19 05:25:37,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1128 states, 905 states have (on average 1.3414364640883978) internal successors, (1214), 917 states have internal predecessors, (1214), 144 states have call successors, (144), 79 states have call predecessors, (144), 77 states have return successors, (141), 132 states have call predecessors, (141), 141 states have call successors, (141) [2023-11-19 05:25:37,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1128 states to 1128 states and 1499 transitions. [2023-11-19 05:25:37,545 INFO L78 Accepts]: Start accepts. Automaton has 1128 states and 1499 transitions. Word has length 89 [2023-11-19 05:25:37,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:37,545 INFO L495 AbstractCegarLoop]: Abstraction has 1128 states and 1499 transitions. [2023-11-19 05:25:37,546 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 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) [2023-11-19 05:25:37,546 INFO L276 IsEmpty]: Start isEmpty. Operand 1128 states and 1499 transitions. [2023-11-19 05:25:37,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2023-11-19 05:25:37,549 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:37,549 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:25:37,577 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:25:37,771 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-19 05:25:37,772 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:37,772 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:37,772 INFO L85 PathProgramCache]: Analyzing trace with hash -1681192259, now seen corresponding path program 1 times [2023-11-19 05:25:37,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:37,772 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2063902874] [2023-11-19 05:25:37,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:37,773 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:37,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:38,006 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 16 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:25:38,006 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:38,006 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2063902874] [2023-11-19 05:25:38,007 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2063902874] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:25:38,007 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1809312807] [2023-11-19 05:25:38,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:38,007 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:38,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:25:38,011 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:25:38,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:25:38,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:38,142 INFO L262 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-19 05:25:38,149 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:25:38,179 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 05:25:38,179 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:25:38,179 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1809312807] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:38,180 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:25:38,180 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-19 05:25:38,183 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401345950] [2023-11-19 05:25:38,183 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:38,184 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:25:38,184 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:38,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:25:38,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:25:38,186 INFO L87 Difference]: Start difference. First operand 1128 states and 1499 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-19 05:25:38,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:38,395 INFO L93 Difference]: Finished difference Result 1255 states and 1658 transitions. [2023-11-19 05:25:38,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:25:38,396 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 73 [2023-11-19 05:25:38,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:38,402 INFO L225 Difference]: With dead ends: 1255 [2023-11-19 05:25:38,403 INFO L226 Difference]: Without dead ends: 721 [2023-11-19 05:25:38,404 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:25:38,405 INFO L413 NwaCegarLoop]: 186 mSDtfsCounter, 25 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 344 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:38,406 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 344 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:25:38,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 721 states. [2023-11-19 05:25:38,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 721 to 721. [2023-11-19 05:25:38,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 721 states, 562 states have (on average 1.3736654804270463) internal successors, (772), 568 states have internal predecessors, (772), 106 states have call successors, (106), 53 states have call predecessors, (106), 52 states have return successors, (104), 100 states have call predecessors, (104), 104 states have call successors, (104) [2023-11-19 05:25:38,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 721 states to 721 states and 982 transitions. [2023-11-19 05:25:38,494 INFO L78 Accepts]: Start accepts. Automaton has 721 states and 982 transitions. Word has length 73 [2023-11-19 05:25:38,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:38,494 INFO L495 AbstractCegarLoop]: Abstraction has 721 states and 982 transitions. [2023-11-19 05:25:38,495 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-19 05:25:38,495 INFO L276 IsEmpty]: Start isEmpty. Operand 721 states and 982 transitions. [2023-11-19 05:25:38,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2023-11-19 05:25:38,499 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:38,499 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:25:38,526 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-11-19 05:25:38,714 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:38,715 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:38,715 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:38,715 INFO L85 PathProgramCache]: Analyzing trace with hash 1319082253, now seen corresponding path program 1 times [2023-11-19 05:25:38,716 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:38,716 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1765715950] [2023-11-19 05:25:38,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:38,716 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:38,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:39,013 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-11-19 05:25:39,013 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:39,013 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1765715950] [2023-11-19 05:25:39,014 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1765715950] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:25:39,014 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [483577837] [2023-11-19 05:25:39,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:39,014 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:39,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:25:39,016 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:25:39,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:25:39,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:39,175 INFO L262 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-19 05:25:39,181 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:25:39,295 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 45 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-19 05:25:39,296 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:25:39,296 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [483577837] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:39,296 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:25:39,296 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2023-11-19 05:25:39,296 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310405345] [2023-11-19 05:25:39,296 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:39,297 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:25:39,297 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:39,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:25:39,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:25:39,298 INFO L87 Difference]: Start difference. First operand 721 states and 982 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 2 states have internal predecessors, (72), 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) [2023-11-19 05:25:39,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:39,493 INFO L93 Difference]: Finished difference Result 2126 states and 2927 transitions. [2023-11-19 05:25:39,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:25:39,494 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 2 states have internal predecessors, (72), 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 113 [2023-11-19 05:25:39,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:39,502 INFO L225 Difference]: With dead ends: 2126 [2023-11-19 05:25:39,503 INFO L226 Difference]: Without dead ends: 1411 [2023-11-19 05:25:39,505 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:25:39,506 INFO L413 NwaCegarLoop]: 111 mSDtfsCounter, 70 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:39,506 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 212 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:25:39,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1411 states. [2023-11-19 05:25:39,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1411 to 1395. [2023-11-19 05:25:39,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1395 states, 1092 states have (on average 1.358974358974359) internal successors, (1484), 1102 states have internal predecessors, (1484), 198 states have call successors, (198), 105 states have call predecessors, (198), 104 states have return successors, (196), 188 states have call predecessors, (196), 196 states have call successors, (196) [2023-11-19 05:25:39,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1395 states to 1395 states and 1878 transitions. [2023-11-19 05:25:39,652 INFO L78 Accepts]: Start accepts. Automaton has 1395 states and 1878 transitions. Word has length 113 [2023-11-19 05:25:39,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:39,653 INFO L495 AbstractCegarLoop]: Abstraction has 1395 states and 1878 transitions. [2023-11-19 05:25:39,653 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 2 states have internal predecessors, (72), 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) [2023-11-19 05:25:39,653 INFO L276 IsEmpty]: Start isEmpty. Operand 1395 states and 1878 transitions. [2023-11-19 05:25:39,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2023-11-19 05:25:39,657 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:39,657 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-11-19 05:25:39,682 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 05:25:39,870 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-19 05:25:39,871 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:39,871 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:39,871 INFO L85 PathProgramCache]: Analyzing trace with hash 974062148, now seen corresponding path program 1 times [2023-11-19 05:25:39,871 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:39,872 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656706824] [2023-11-19 05:25:39,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:39,872 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:39,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:39,952 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-19 05:25:39,952 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:39,952 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656706824] [2023-11-19 05:25:39,952 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1656706824] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:39,953 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:25:39,953 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:25:39,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229512762] [2023-11-19 05:25:39,953 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:39,954 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:25:39,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:39,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:25:39,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:25:39,955 INFO L87 Difference]: Start difference. First operand 1395 states and 1878 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-19 05:25:40,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:40,232 INFO L93 Difference]: Finished difference Result 3476 states and 4707 transitions. [2023-11-19 05:25:40,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:25:40,233 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 99 [2023-11-19 05:25:40,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:40,248 INFO L225 Difference]: With dead ends: 3476 [2023-11-19 05:25:40,248 INFO L226 Difference]: Without dead ends: 2087 [2023-11-19 05:25:40,254 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:25:40,254 INFO L413 NwaCegarLoop]: 152 mSDtfsCounter, 103 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:40,255 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 253 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:25:40,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2087 states. [2023-11-19 05:25:40,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2087 to 2071. [2023-11-19 05:25:40,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2071 states, 1624 states have (on average 1.3448275862068966) internal successors, (2184), 1638 states have internal predecessors, (2184), 290 states have call successors, (290), 157 states have call predecessors, (290), 156 states have return successors, (288), 276 states have call predecessors, (288), 288 states have call successors, (288) [2023-11-19 05:25:40,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2071 states to 2071 states and 2762 transitions. [2023-11-19 05:25:40,472 INFO L78 Accepts]: Start accepts. Automaton has 2071 states and 2762 transitions. Word has length 99 [2023-11-19 05:25:40,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:40,474 INFO L495 AbstractCegarLoop]: Abstraction has 2071 states and 2762 transitions. [2023-11-19 05:25:40,474 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-19 05:25:40,474 INFO L276 IsEmpty]: Start isEmpty. Operand 2071 states and 2762 transitions. [2023-11-19 05:25:40,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2023-11-19 05:25:40,484 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:40,485 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:25:40,485 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-11-19 05:25:40,485 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:40,485 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:40,486 INFO L85 PathProgramCache]: Analyzing trace with hash -1151076876, now seen corresponding path program 1 times [2023-11-19 05:25:40,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:40,486 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [219830717] [2023-11-19 05:25:40,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:40,486 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:40,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:40,813 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-19 05:25:40,814 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:40,814 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [219830717] [2023-11-19 05:25:40,814 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [219830717] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:25:40,814 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1553600492] [2023-11-19 05:25:40,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:40,815 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:40,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:25:40,816 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:25:40,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 05:25:40,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:40,982 INFO L262 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 05:25:40,989 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:25:41,026 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-19 05:25:41,027 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:25:41,027 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1553600492] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:41,027 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:25:41,027 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-19 05:25:41,028 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622385788] [2023-11-19 05:25:41,028 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:41,029 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:25:41,029 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:41,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:25:41,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:25:41,030 INFO L87 Difference]: Start difference. First operand 2071 states and 2762 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-19 05:25:41,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:41,287 INFO L93 Difference]: Finished difference Result 3471 states and 4728 transitions. [2023-11-19 05:25:41,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:25:41,288 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 113 [2023-11-19 05:25:41,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:41,302 INFO L225 Difference]: With dead ends: 3471 [2023-11-19 05:25:41,302 INFO L226 Difference]: Without dead ends: 2083 [2023-11-19 05:25:41,307 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:25:41,308 INFO L413 NwaCegarLoop]: 166 mSDtfsCounter, 102 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:41,309 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 269 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:25:41,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2083 states. [2023-11-19 05:25:41,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2083 to 2063. [2023-11-19 05:25:41,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2063 states, 1616 states have (on average 1.3217821782178218) internal successors, (2136), 1630 states have internal predecessors, (2136), 290 states have call successors, (290), 157 states have call predecessors, (290), 156 states have return successors, (288), 276 states have call predecessors, (288), 288 states have call successors, (288) [2023-11-19 05:25:41,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2063 states to 2063 states and 2714 transitions. [2023-11-19 05:25:41,538 INFO L78 Accepts]: Start accepts. Automaton has 2063 states and 2714 transitions. Word has length 113 [2023-11-19 05:25:41,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:41,539 INFO L495 AbstractCegarLoop]: Abstraction has 2063 states and 2714 transitions. [2023-11-19 05:25:41,539 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-19 05:25:41,539 INFO L276 IsEmpty]: Start isEmpty. Operand 2063 states and 2714 transitions. [2023-11-19 05:25:41,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2023-11-19 05:25:41,548 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:41,548 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:25:41,579 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 05:25:41,770 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:41,771 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:41,771 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:41,771 INFO L85 PathProgramCache]: Analyzing trace with hash 14195988, now seen corresponding path program 1 times [2023-11-19 05:25:41,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:41,772 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016403178] [2023-11-19 05:25:41,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:41,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:41,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:42,107 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 10 proven. 25 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-19 05:25:42,108 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:42,108 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016403178] [2023-11-19 05:25:42,108 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2016403178] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:25:42,108 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153415858] [2023-11-19 05:25:42,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:42,109 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:42,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:25:42,110 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:25:42,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 05:25:42,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:42,287 INFO L262 TraceCheckSpWp]: Trace formula consists of 552 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-19 05:25:42,291 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:25:42,321 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-19 05:25:42,321 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:25:42,322 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [153415858] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:42,322 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:25:42,322 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-19 05:25:42,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943474793] [2023-11-19 05:25:42,323 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:42,323 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:25:42,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:42,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:25:42,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:25:42,325 INFO L87 Difference]: Start difference. First operand 2063 states and 2714 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-19 05:25:42,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:42,606 INFO L93 Difference]: Finished difference Result 3883 states and 5095 transitions. [2023-11-19 05:25:42,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:25:42,607 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 113 [2023-11-19 05:25:42,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:42,624 INFO L225 Difference]: With dead ends: 3883 [2023-11-19 05:25:42,624 INFO L226 Difference]: Without dead ends: 2511 [2023-11-19 05:25:42,630 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:25:42,631 INFO L413 NwaCegarLoop]: 123 mSDtfsCounter, 113 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:42,632 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [113 Valid, 147 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:25:42,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2511 states. [2023-11-19 05:25:42,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2511 to 2511. [2023-11-19 05:25:42,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2511 states, 2000 states have (on average 1.29) internal successors, (2580), 2014 states have internal predecessors, (2580), 310 states have call successors, (310), 201 states have call predecessors, (310), 200 states have return successors, (308), 296 states have call predecessors, (308), 308 states have call successors, (308) [2023-11-19 05:25:42,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2511 states to 2511 states and 3198 transitions. [2023-11-19 05:25:42,894 INFO L78 Accepts]: Start accepts. Automaton has 2511 states and 3198 transitions. Word has length 113 [2023-11-19 05:25:42,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:42,895 INFO L495 AbstractCegarLoop]: Abstraction has 2511 states and 3198 transitions. [2023-11-19 05:25:42,895 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-19 05:25:42,895 INFO L276 IsEmpty]: Start isEmpty. Operand 2511 states and 3198 transitions. [2023-11-19 05:25:42,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-11-19 05:25:42,903 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:42,904 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:25:42,932 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 05:25:43,118 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:43,119 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:43,119 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:43,120 INFO L85 PathProgramCache]: Analyzing trace with hash 1611625733, now seen corresponding path program 1 times [2023-11-19 05:25:43,120 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:43,120 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [864954362] [2023-11-19 05:25:43,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:43,120 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:43,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:43,464 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-19 05:25:43,464 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:43,464 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [864954362] [2023-11-19 05:25:43,465 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [864954362] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:25:43,465 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [283596442] [2023-11-19 05:25:43,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:43,465 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:43,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:25:43,467 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:25:43,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 05:25:43,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:43,661 INFO L262 TraceCheckSpWp]: Trace formula consists of 551 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 05:25:43,665 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:25:43,697 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 54 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-19 05:25:43,697 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:25:43,697 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [283596442] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:43,698 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:25:43,698 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-19 05:25:43,698 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504014157] [2023-11-19 05:25:43,698 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:43,699 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:25:43,699 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:43,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:25:43,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:25:43,700 INFO L87 Difference]: Start difference. First operand 2511 states and 3198 transitions. Second operand has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-19 05:25:44,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:44,077 INFO L93 Difference]: Finished difference Result 5919 states and 7617 transitions. [2023-11-19 05:25:44,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:25:44,078 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 114 [2023-11-19 05:25:44,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:44,099 INFO L225 Difference]: With dead ends: 5919 [2023-11-19 05:25:44,099 INFO L226 Difference]: Without dead ends: 3415 [2023-11-19 05:25:44,107 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:25:44,107 INFO L413 NwaCegarLoop]: 126 mSDtfsCounter, 60 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:44,108 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 220 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:25:44,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3415 states. [2023-11-19 05:25:44,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3415 to 2775. [2023-11-19 05:25:44,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2775 states, 2236 states have (on average 1.3076923076923077) internal successors, (2924), 2251 states have internal predecessors, (2924), 324 states have call successors, (324), 215 states have call predecessors, (324), 214 states have return successors, (322), 309 states have call predecessors, (322), 322 states have call successors, (322) [2023-11-19 05:25:44,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2775 states to 2775 states and 3570 transitions. [2023-11-19 05:25:44,492 INFO L78 Accepts]: Start accepts. Automaton has 2775 states and 3570 transitions. Word has length 114 [2023-11-19 05:25:44,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:44,493 INFO L495 AbstractCegarLoop]: Abstraction has 2775 states and 3570 transitions. [2023-11-19 05:25:44,493 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-19 05:25:44,493 INFO L276 IsEmpty]: Start isEmpty. Operand 2775 states and 3570 transitions. [2023-11-19 05:25:44,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-11-19 05:25:44,505 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:44,506 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:25:44,537 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-19 05:25:44,720 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-11-19 05:25:44,721 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:44,721 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:44,721 INFO L85 PathProgramCache]: Analyzing trace with hash -1777586524, now seen corresponding path program 1 times [2023-11-19 05:25:44,721 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:44,722 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [714668778] [2023-11-19 05:25:44,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:44,722 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:44,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:44,870 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 23 proven. 1 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-11-19 05:25:44,871 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:44,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [714668778] [2023-11-19 05:25:44,871 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [714668778] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:25:44,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [860585150] [2023-11-19 05:25:44,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:44,872 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:44,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:25:44,874 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:25:44,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-19 05:25:45,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:45,049 INFO L262 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-19 05:25:45,054 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:25:45,082 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-19 05:25:45,082 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:25:45,082 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [860585150] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:45,082 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:25:45,083 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-19 05:25:45,085 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565473535] [2023-11-19 05:25:45,086 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:45,087 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:25:45,087 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:45,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:25:45,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:25:45,089 INFO L87 Difference]: Start difference. First operand 2775 states and 3570 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-19 05:25:45,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:45,439 INFO L93 Difference]: Finished difference Result 5211 states and 6770 transitions. [2023-11-19 05:25:45,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:25:45,440 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 114 [2023-11-19 05:25:45,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:45,467 INFO L225 Difference]: With dead ends: 5211 [2023-11-19 05:25:45,468 INFO L226 Difference]: Without dead ends: 3373 [2023-11-19 05:25:45,474 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:25:45,476 INFO L413 NwaCegarLoop]: 161 mSDtfsCounter, 63 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:45,477 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 274 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:25:45,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3373 states. [2023-11-19 05:25:45,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3373 to 3095. [2023-11-19 05:25:45,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3095 states, 2524 states have (on average 1.329635499207607) internal successors, (3356), 2539 states have internal predecessors, (3356), 340 states have call successors, (340), 231 states have call predecessors, (340), 230 states have return successors, (338), 325 states have call predecessors, (338), 338 states have call successors, (338) [2023-11-19 05:25:45,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3095 states to 3095 states and 4034 transitions. [2023-11-19 05:25:45,816 INFO L78 Accepts]: Start accepts. Automaton has 3095 states and 4034 transitions. Word has length 114 [2023-11-19 05:25:45,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:45,817 INFO L495 AbstractCegarLoop]: Abstraction has 3095 states and 4034 transitions. [2023-11-19 05:25:45,817 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-19 05:25:45,817 INFO L276 IsEmpty]: Start isEmpty. Operand 3095 states and 4034 transitions. [2023-11-19 05:25:45,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2023-11-19 05:25:45,826 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:45,826 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:25:45,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-19 05:25:46,042 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:46,043 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:46,043 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:46,043 INFO L85 PathProgramCache]: Analyzing trace with hash 837553422, now seen corresponding path program 1 times [2023-11-19 05:25:46,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:46,044 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2070910611] [2023-11-19 05:25:46,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:46,044 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:46,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:46,294 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 19 proven. 26 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-19 05:25:46,294 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:46,295 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2070910611] [2023-11-19 05:25:46,295 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2070910611] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:25:46,295 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [150456273] [2023-11-19 05:25:46,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:46,295 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:46,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:25:46,297 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:25:46,309 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-19 05:25:46,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:46,471 INFO L262 TraceCheckSpWp]: Trace formula consists of 557 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-19 05:25:46,475 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:25:46,593 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 05:25:46,593 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:25:46,593 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [150456273] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:46,593 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:25:46,594 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2023-11-19 05:25:46,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208719935] [2023-11-19 05:25:46,594 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:46,595 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:25:46,595 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:46,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:25:46,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:25:46,596 INFO L87 Difference]: Start difference. First operand 3095 states and 4034 transitions. Second operand has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 4 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-19 05:25:47,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:47,233 INFO L93 Difference]: Finished difference Result 6029 states and 7934 transitions. [2023-11-19 05:25:47,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:25:47,234 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 4 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 4 states have call successors, (10) Word has length 116 [2023-11-19 05:25:47,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:47,274 INFO L225 Difference]: With dead ends: 6029 [2023-11-19 05:25:47,274 INFO L226 Difference]: Without dead ends: 4427 [2023-11-19 05:25:47,279 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:25:47,280 INFO L413 NwaCegarLoop]: 188 mSDtfsCounter, 161 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 311 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:47,280 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 311 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:25:47,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4427 states. [2023-11-19 05:25:47,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4427 to 4248. [2023-11-19 05:25:47,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4248 states, 3550 states have (on average 1.3202816901408452) internal successors, (4687), 3565 states have internal predecessors, (4687), 392 states have call successors, (392), 306 states have call predecessors, (392), 305 states have return successors, (412), 377 states have call predecessors, (412), 390 states have call successors, (412) [2023-11-19 05:25:47,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4248 states to 4248 states and 5491 transitions. [2023-11-19 05:25:47,688 INFO L78 Accepts]: Start accepts. Automaton has 4248 states and 5491 transitions. Word has length 116 [2023-11-19 05:25:47,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:47,689 INFO L495 AbstractCegarLoop]: Abstraction has 4248 states and 5491 transitions. [2023-11-19 05:25:47,689 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 4 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-19 05:25:47,689 INFO L276 IsEmpty]: Start isEmpty. Operand 4248 states and 5491 transitions. [2023-11-19 05:25:47,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2023-11-19 05:25:47,699 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:47,700 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:25:47,725 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-19 05:25:47,920 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:47,921 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:47,921 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:47,921 INFO L85 PathProgramCache]: Analyzing trace with hash -1728567403, now seen corresponding path program 1 times [2023-11-19 05:25:47,921 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:47,921 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965886953] [2023-11-19 05:25:47,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:47,921 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:47,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:48,027 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 21 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-11-19 05:25:48,028 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:48,028 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965886953] [2023-11-19 05:25:48,028 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1965886953] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:25:48,028 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1735381934] [2023-11-19 05:25:48,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:48,028 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:48,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:25:48,030 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:25:48,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-19 05:25:48,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:48,181 INFO L262 TraceCheckSpWp]: Trace formula consists of 558 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-19 05:25:48,184 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:25:48,207 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-19 05:25:48,208 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:25:48,208 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1735381934] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:48,208 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:25:48,208 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-19 05:25:48,208 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937978946] [2023-11-19 05:25:48,209 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:48,209 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:25:48,209 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:48,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:25:48,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:25:48,210 INFO L87 Difference]: Start difference. First operand 4248 states and 5491 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-19 05:25:48,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:48,692 INFO L93 Difference]: Finished difference Result 8074 states and 10558 transitions. [2023-11-19 05:25:48,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:25:48,693 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 117 [2023-11-19 05:25:48,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:48,720 INFO L225 Difference]: With dead ends: 8074 [2023-11-19 05:25:48,720 INFO L226 Difference]: Without dead ends: 5884 [2023-11-19 05:25:48,727 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:25:48,728 INFO L413 NwaCegarLoop]: 188 mSDtfsCounter, 73 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 303 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:48,729 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 303 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:25:48,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5884 states. [2023-11-19 05:25:49,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5884 to 5066. [2023-11-19 05:25:49,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5066 states, 4278 states have (on average 1.3309957924263676) internal successors, (5694), 4293 states have internal predecessors, (5694), 437 states have call successors, (437), 351 states have call predecessors, (437), 350 states have return successors, (457), 422 states have call predecessors, (457), 435 states have call successors, (457) [2023-11-19 05:25:49,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5066 states to 5066 states and 6588 transitions. [2023-11-19 05:25:49,465 INFO L78 Accepts]: Start accepts. Automaton has 5066 states and 6588 transitions. Word has length 117 [2023-11-19 05:25:49,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:49,465 INFO L495 AbstractCegarLoop]: Abstraction has 5066 states and 6588 transitions. [2023-11-19 05:25:49,467 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-19 05:25:49,467 INFO L276 IsEmpty]: Start isEmpty. Operand 5066 states and 6588 transitions. [2023-11-19 05:25:49,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2023-11-19 05:25:49,482 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:49,483 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:25:49,513 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-19 05:25:49,698 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-11-19 05:25:49,699 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:49,699 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:49,700 INFO L85 PathProgramCache]: Analyzing trace with hash 368600380, now seen corresponding path program 1 times [2023-11-19 05:25:49,700 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:49,700 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817073126] [2023-11-19 05:25:49,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:49,701 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:49,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:50,265 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 12 proven. 26 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-11-19 05:25:50,266 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:50,266 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [817073126] [2023-11-19 05:25:50,266 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [817073126] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:25:50,266 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1365573335] [2023-11-19 05:25:50,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:50,267 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:50,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:25:50,268 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:25:50,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-19 05:25:50,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:50,433 INFO L262 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 05:25:50,437 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:25:50,525 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-19 05:25:50,526 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:25:50,526 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1365573335] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:25:50,526 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:25:50,526 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [6] total 11 [2023-11-19 05:25:50,527 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225329717] [2023-11-19 05:25:50,527 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:25:50,527 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 05:25:50,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:50,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 05:25:50,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2023-11-19 05:25:50,528 INFO L87 Difference]: Start difference. First operand 5066 states and 6588 transitions. Second operand has 7 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-19 05:25:51,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:51,281 INFO L93 Difference]: Finished difference Result 8940 states and 11804 transitions. [2023-11-19 05:25:51,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:25:51,282 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 121 [2023-11-19 05:25:51,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:51,298 INFO L225 Difference]: With dead ends: 8940 [2023-11-19 05:25:51,299 INFO L226 Difference]: Without dead ends: 5861 [2023-11-19 05:25:51,306 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2023-11-19 05:25:51,307 INFO L413 NwaCegarLoop]: 195 mSDtfsCounter, 181 mSDsluCounter, 712 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 185 SdHoareTripleChecker+Valid, 907 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:51,307 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [185 Valid, 907 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:25:51,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5861 states. [2023-11-19 05:25:51,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5861 to 5120. [2023-11-19 05:25:51,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5120 states, 4334 states have (on average 1.3357175819104754) internal successors, (5789), 4348 states have internal predecessors, (5789), 435 states have call successors, (435), 351 states have call predecessors, (435), 350 states have return successors, (454), 421 states have call predecessors, (454), 433 states have call successors, (454) [2023-11-19 05:25:51,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5120 states to 5120 states and 6678 transitions. [2023-11-19 05:25:51,793 INFO L78 Accepts]: Start accepts. Automaton has 5120 states and 6678 transitions. Word has length 121 [2023-11-19 05:25:51,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:51,794 INFO L495 AbstractCegarLoop]: Abstraction has 5120 states and 6678 transitions. [2023-11-19 05:25:51,794 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-19 05:25:51,794 INFO L276 IsEmpty]: Start isEmpty. Operand 5120 states and 6678 transitions. [2023-11-19 05:25:51,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2023-11-19 05:25:51,803 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:51,803 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:25:51,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-11-19 05:25:52,018 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_88232cb7-dd2d-4d44-a74d-c1383f199380/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-11-19 05:25:52,019 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:52,019 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:52,019 INFO L85 PathProgramCache]: Analyzing trace with hash 1098920652, now seen corresponding path program 1 times [2023-11-19 05:25:52,019 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:52,019 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [495019073] [2023-11-19 05:25:52,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:52,020 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:52,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat