./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.14.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 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_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.14.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash baf2679bf12305063b7a185b7ceccd8123ae67f841713533125dfbe04aeffae0 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:16:40,131 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:16:40,250 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:16:40,262 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:16:40,263 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:16:40,315 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:16:40,318 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:16:40,319 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:16:40,320 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:16:40,325 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:16:40,326 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:16:40,327 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:16:40,328 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:16:40,329 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:16:40,330 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:16:40,330 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:16:40,331 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:16:40,331 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:16:40,332 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:16:40,332 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:16:40,333 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:16:40,333 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:16:40,334 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:16:40,335 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:16:40,335 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:16:40,336 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:16:40,336 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:16:40,336 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:16:40,337 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:16:40,337 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:16:40,339 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:16:40,339 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:16:40,339 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:16:40,340 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:16:40,340 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:16:40,340 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:16:40,340 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:16:40,341 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:16:40,341 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:16:40,341 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:16:40,341 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:16:40,342 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:16:40,342 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:16:40,342 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:16:40,343 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:16:40,343 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:16:40,344 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:16:40,344 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_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> baf2679bf12305063b7a185b7ceccd8123ae67f841713533125dfbe04aeffae0 [2023-11-23 21:16:40,674 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:16:40,704 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:16:40,707 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:16:40,709 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:16:40,710 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:16:40,711 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.14.cil.c [2023-11-23 21:16:43,900 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:16:44,817 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:16:44,818 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/sv-benchmarks/c/combinations/Problem05_label42+token_ring.14.cil.c [2023-11-23 21:16:44,872 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/data/684572587/1fe347a151f44ea7bbebca70f26af9e1/FLAGa80bc19be [2023-11-23 21:16:44,888 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/data/684572587/1fe347a151f44ea7bbebca70f26af9e1 [2023-11-23 21:16:44,894 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:16:44,904 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:16:44,909 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:16:44,909 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:16:44,916 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:16:44,918 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:16:44" (1/1) ... [2023-11-23 21:16:44,920 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@632abc60 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:44, skipping insertion in model container [2023-11-23 21:16:44,920 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:16:44" (1/1) ... [2023-11-23 21:16:45,309 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:16:47,965 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_ba7c9cfc-45d8-4485-8ff8-79364a821682/sv-benchmarks/c/combinations/Problem05_label42+token_ring.14.cil.c[378560,378573] [2023-11-23 21:16:48,001 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_ba7c9cfc-45d8-4485-8ff8-79364a821682/sv-benchmarks/c/combinations/Problem05_label42+token_ring.14.cil.c[383339,383352] [2023-11-23 21:16:48,369 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:16:48,381 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:16:49,674 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_ba7c9cfc-45d8-4485-8ff8-79364a821682/sv-benchmarks/c/combinations/Problem05_label42+token_ring.14.cil.c[378560,378573] [2023-11-23 21:16:49,684 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_ba7c9cfc-45d8-4485-8ff8-79364a821682/sv-benchmarks/c/combinations/Problem05_label42+token_ring.14.cil.c[383339,383352] [2023-11-23 21:16:49,726 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:16:49,814 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:16:49,815 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:49 WrapperNode [2023-11-23 21:16:49,815 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:16:49,817 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:16:49,817 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:16:49,817 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:16:49,825 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:49" (1/1) ... [2023-11-23 21:16:49,910 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:49" (1/1) ... [2023-11-23 21:16:50,472 INFO L138 Inliner]: procedures = 68, calls = 78, calls flagged for inlining = 45, calls inlined = 45, statements flattened = 13232 [2023-11-23 21:16:50,472 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:16:50,473 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:16:50,473 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:16:50,474 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:16:50,484 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:49" (1/1) ... [2023-11-23 21:16:50,485 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:49" (1/1) ... [2023-11-23 21:16:50,586 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:49" (1/1) ... [2023-11-23 21:16:50,601 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:49" (1/1) ... [2023-11-23 21:16:50,916 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:49" (1/1) ... [2023-11-23 21:16:51,101 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:49" (1/1) ... [2023-11-23 21:16:51,148 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:49" (1/1) ... [2023-11-23 21:16:51,190 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:49" (1/1) ... [2023-11-23 21:16:51,321 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:16:51,323 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:16:51,323 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:16:51,323 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:16:51,324 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:49" (1/1) ... [2023-11-23 21:16:51,331 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:16:51,347 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:16:51,363 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:16:51,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:16:51,426 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:16:51,428 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-11-23 21:16:51,429 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-11-23 21:16:51,429 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-11-23 21:16:51,430 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-11-23 21:16:51,430 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-11-23 21:16:51,430 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-11-23 21:16:51,430 INFO L130 BoogieDeclarations]: Found specification of procedure error [2023-11-23 21:16:51,430 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2023-11-23 21:16:51,431 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-11-23 21:16:51,431 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-11-23 21:16:51,431 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-11-23 21:16:51,431 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-11-23 21:16:51,432 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-11-23 21:16:51,432 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-11-23 21:16:51,437 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:16:51,437 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:16:51,437 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:16:51,599 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:16:51,602 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:17:01,595 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:17:04,427 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:17:04,427 INFO L309 CfgBuilder]: Removed 16 assume(true) statements. [2023-11-23 21:17:04,430 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:17:04 BoogieIcfgContainer [2023-11-23 21:17:04,430 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:17:04,433 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:17:04,433 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:17:04,436 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:17:04,437 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:16:44" (1/3) ... [2023-11-23 21:17:04,438 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60e11cb2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:17:04, skipping insertion in model container [2023-11-23 21:17:04,438 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:49" (2/3) ... [2023-11-23 21:17:04,438 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60e11cb2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:17:04, skipping insertion in model container [2023-11-23 21:17:04,439 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:17:04" (3/3) ... [2023-11-23 21:17:04,440 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem05_label42+token_ring.14.cil.c [2023-11-23 21:17:04,462 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:17:04,462 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-11-23 21:17:04,582 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:17:04,589 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;@6d0a631d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:17:04,589 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-11-23 21:17:04,604 INFO L276 IsEmpty]: Start isEmpty. Operand has 1850 states, 1812 states have (on average 1.9492273730684326) internal successors, (3532), 1817 states have internal predecessors, (3532), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2023-11-23 21:17:04,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2023-11-23 21:17:04,628 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:17:04,628 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:17:04,629 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:17:04,633 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:17:04,634 INFO L85 PathProgramCache]: Analyzing trace with hash -2037472396, now seen corresponding path program 1 times [2023-11-23 21:17:04,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:17:04,645 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20163262] [2023-11-23 21:17:04,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:04,646 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:17:04,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:05,347 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:17:05,348 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:17:05,348 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20163262] [2023-11-23 21:17:05,349 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [20163262] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:17:05,349 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:17:05,350 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 21:17:05,352 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049852090] [2023-11-23 21:17:05,353 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:17:05,358 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:17:05,358 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:17:05,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:17:05,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:17:05,416 INFO L87 Difference]: Start difference. First operand has 1850 states, 1812 states have (on average 1.9492273730684326) internal successors, (3532), 1817 states have internal predecessors, (3532), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 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) [2023-11-23 21:17:06,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:17:06,678 INFO L93 Difference]: Finished difference Result 3883 states and 7486 transitions. [2023-11-23 21:17:06,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:17:06,681 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 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 68 [2023-11-23 21:17:06,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:17:06,709 INFO L225 Difference]: With dead ends: 3883 [2023-11-23 21:17:06,709 INFO L226 Difference]: Without dead ends: 2032 [2023-11-23 21:17:06,722 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 [2023-11-23 21:17:06,726 INFO L413 NwaCegarLoop]: 3545 mSDtfsCounter, 3813 mSDsluCounter, 3445 mSDsCounter, 0 mSdLazyCounter, 728 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3813 SdHoareTripleChecker+Valid, 6990 SdHoareTripleChecker+Invalid, 742 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 728 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:17:06,728 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3813 Valid, 6990 Invalid, 742 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [14 Valid, 728 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-23 21:17:06,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2032 states. [2023-11-23 21:17:06,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2032 to 2031. [2023-11-23 21:17:06,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2031 states, 1967 states have (on average 1.907473309608541) internal successors, (3752), 1971 states have internal predecessors, (3752), 50 states have call successors, (50), 13 states have call predecessors, (50), 12 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2023-11-23 21:17:06,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2031 states to 2031 states and 3850 transitions. [2023-11-23 21:17:06,916 INFO L78 Accepts]: Start accepts. Automaton has 2031 states and 3850 transitions. Word has length 68 [2023-11-23 21:17:06,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:17:06,917 INFO L495 AbstractCegarLoop]: Abstraction has 2031 states and 3850 transitions. [2023-11-23 21:17:06,917 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 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) [2023-11-23 21:17:06,918 INFO L276 IsEmpty]: Start isEmpty. Operand 2031 states and 3850 transitions. [2023-11-23 21:17:06,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-11-23 21:17:06,927 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:17:06,927 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-11-23 21:17:06,928 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:17:06,928 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:17:06,929 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:17:06,929 INFO L85 PathProgramCache]: Analyzing trace with hash 1161048637, now seen corresponding path program 1 times [2023-11-23 21:17:06,929 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:17:06,930 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [596333329] [2023-11-23 21:17:06,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:06,930 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:17:06,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:07,386 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:17:07,389 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:17:07,389 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [596333329] [2023-11-23 21:17:07,389 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [596333329] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:17:07,390 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1495538042] [2023-11-23 21:17:07,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:07,390 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:07,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:17:07,394 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:17:07,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:17:07,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:07,678 INFO L262 TraceCheckSpWp]: Trace formula consists of 1048 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:17:07,689 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:17:07,781 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-23 21:17:07,782 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:17:07,782 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1495538042] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:17:07,782 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:17:07,782 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:17:07,783 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658635951] [2023-11-23 21:17:07,783 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:17:07,784 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:17:07,785 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:17:07,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:17:07,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:17:07,786 INFO L87 Difference]: Start difference. First operand 2031 states and 3850 transitions. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 2 states have internal predecessors, (104), 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) [2023-11-23 21:17:08,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:17:08,523 INFO L93 Difference]: Finished difference Result 2794 states and 5017 transitions. [2023-11-23 21:17:08,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:17:08,524 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 2 states have internal predecessors, (104), 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 138 [2023-11-23 21:17:08,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:17:08,544 INFO L225 Difference]: With dead ends: 2794 [2023-11-23 21:17:08,544 INFO L226 Difference]: Without dead ends: 2409 [2023-11-23 21:17:08,547 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:17:08,549 INFO L413 NwaCegarLoop]: 3371 mSDtfsCounter, 3528 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3528 SdHoareTripleChecker+Valid, 3617 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:17:08,550 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3528 Valid, 3617 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:17:08,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2409 states. [2023-11-23 21:17:08,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2409 to 2403. [2023-11-23 21:17:08,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2403 states, 2285 states have (on average 1.8472647702407001) internal successors, (4221), 2290 states have internal predecessors, (4221), 92 states have call successors, (92), 25 states have call predecessors, (92), 24 states have return successors, (90), 88 states have call predecessors, (90), 90 states have call successors, (90) [2023-11-23 21:17:08,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2403 states to 2403 states and 4403 transitions. [2023-11-23 21:17:08,693 INFO L78 Accepts]: Start accepts. Automaton has 2403 states and 4403 transitions. Word has length 138 [2023-11-23 21:17:08,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:17:08,696 INFO L495 AbstractCegarLoop]: Abstraction has 2403 states and 4403 transitions. [2023-11-23 21:17:08,697 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 2 states have internal predecessors, (104), 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) [2023-11-23 21:17:08,697 INFO L276 IsEmpty]: Start isEmpty. Operand 2403 states and 4403 transitions. [2023-11-23 21:17:08,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-11-23 21:17:08,714 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:17:08,715 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-11-23 21:17:08,738 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-23 21:17:08,929 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:08,929 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:17:08,930 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:17:08,930 INFO L85 PathProgramCache]: Analyzing trace with hash 2056522077, now seen corresponding path program 1 times [2023-11-23 21:17:08,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:17:08,930 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [262076831] [2023-11-23 21:17:08,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:08,931 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:17:08,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:09,265 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:17:09,266 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:17:09,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [262076831] [2023-11-23 21:17:09,271 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [262076831] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:17:09,271 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1154254323] [2023-11-23 21:17:09,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:09,272 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:09,272 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:17:09,273 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:17:09,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:17:09,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:09,557 INFO L262 TraceCheckSpWp]: Trace formula consists of 1042 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:17:09,573 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:17:09,639 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-11-23 21:17:09,646 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:17:09,647 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1154254323] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:17:09,647 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:17:09,648 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:17:09,648 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682082262] [2023-11-23 21:17:09,648 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:17:09,651 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:17:09,651 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:17:09,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:17:09,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:17:09,653 INFO L87 Difference]: Start difference. First operand 2403 states and 4403 transitions. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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) [2023-11-23 21:17:10,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:17:10,326 INFO L93 Difference]: Finished difference Result 3904 states and 6694 transitions. [2023-11-23 21:17:10,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:17:10,327 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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 138 [2023-11-23 21:17:10,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:17:10,350 INFO L225 Difference]: With dead ends: 3904 [2023-11-23 21:17:10,350 INFO L226 Difference]: Without dead ends: 3147 [2023-11-23 21:17:10,355 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:17:10,357 INFO L413 NwaCegarLoop]: 3369 mSDtfsCounter, 3546 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3546 SdHoareTripleChecker+Valid, 3615 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:17:10,357 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3546 Valid, 3615 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:17:10,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3147 states. [2023-11-23 21:17:10,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3147 to 3139. [2023-11-23 21:17:10,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3139 states, 2915 states have (on average 1.7656946826758146) internal successors, (5147), 2922 states have internal predecessors, (5147), 174 states have call successors, (174), 49 states have call predecessors, (174), 48 states have return successors, (172), 168 states have call predecessors, (172), 172 states have call successors, (172) [2023-11-23 21:17:10,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3139 states to 3139 states and 5493 transitions. [2023-11-23 21:17:10,523 INFO L78 Accepts]: Start accepts. Automaton has 3139 states and 5493 transitions. Word has length 138 [2023-11-23 21:17:10,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:17:10,524 INFO L495 AbstractCegarLoop]: Abstraction has 3139 states and 5493 transitions. [2023-11-23 21:17:10,524 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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) [2023-11-23 21:17:10,524 INFO L276 IsEmpty]: Start isEmpty. Operand 3139 states and 5493 transitions. [2023-11-23 21:17:10,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-11-23 21:17:10,531 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:17:10,532 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-11-23 21:17:10,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:17:10,748 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:10,749 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:17:10,749 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:17:10,749 INFO L85 PathProgramCache]: Analyzing trace with hash -2087167875, now seen corresponding path program 1 times [2023-11-23 21:17:10,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:17:10,750 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [374382212] [2023-11-23 21:17:10,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:10,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:17:10,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:11,009 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:17:11,010 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:17:11,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [374382212] [2023-11-23 21:17:11,010 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [374382212] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:17:11,011 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1753315791] [2023-11-23 21:17:11,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:11,011 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:11,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:17:11,013 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:17:11,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:17:11,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:11,298 INFO L262 TraceCheckSpWp]: Trace formula consists of 1036 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:17:11,313 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:17:11,366 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-11-23 21:17:11,367 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:17:11,367 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1753315791] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:17:11,367 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:17:11,368 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:17:11,368 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943353914] [2023-11-23 21:17:11,368 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:17:11,369 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:17:11,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:17:11,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:17:11,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:17:11,370 INFO L87 Difference]: Start difference. First operand 3139 states and 5493 transitions. Second operand has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 2 states have internal predecessors, (92), 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) [2023-11-23 21:17:12,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:17:12,078 INFO L93 Difference]: Finished difference Result 6100 states and 9998 transitions. [2023-11-23 21:17:12,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:17:12,079 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 2 states have internal predecessors, (92), 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 138 [2023-11-23 21:17:12,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:17:12,113 INFO L225 Difference]: With dead ends: 6100 [2023-11-23 21:17:12,114 INFO L226 Difference]: Without dead ends: 4607 [2023-11-23 21:17:12,122 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:17:12,123 INFO L413 NwaCegarLoop]: 3310 mSDtfsCounter, 3540 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3540 SdHoareTripleChecker+Valid, 3556 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:17:12,124 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3540 Valid, 3556 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:17:12,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4607 states. [2023-11-23 21:17:12,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4607 to 4595. [2023-11-23 21:17:12,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4595 states, 4163 states have (on average 1.675474417487389) internal successors, (6975), 4174 states have internal predecessors, (6975), 334 states have call successors, (334), 97 states have call predecessors, (334), 96 states have return successors, (332), 324 states have call predecessors, (332), 332 states have call successors, (332) [2023-11-23 21:17:12,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4595 states to 4595 states and 7641 transitions. [2023-11-23 21:17:12,393 INFO L78 Accepts]: Start accepts. Automaton has 4595 states and 7641 transitions. Word has length 138 [2023-11-23 21:17:12,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:17:12,394 INFO L495 AbstractCegarLoop]: Abstraction has 4595 states and 7641 transitions. [2023-11-23 21:17:12,394 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 2 states have internal predecessors, (92), 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) [2023-11-23 21:17:12,394 INFO L276 IsEmpty]: Start isEmpty. Operand 4595 states and 7641 transitions. [2023-11-23 21:17:12,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-11-23 21:17:12,405 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:17:12,406 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-11-23 21:17:12,433 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:17:12,621 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:12,621 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:17:12,621 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:17:12,622 INFO L85 PathProgramCache]: Analyzing trace with hash 2102296477, now seen corresponding path program 1 times [2023-11-23 21:17:12,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:17:12,622 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1746644634] [2023-11-23 21:17:12,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:12,622 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:17:12,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:12,874 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:17:12,875 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:17:12,875 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1746644634] [2023-11-23 21:17:12,875 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1746644634] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:17:12,876 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [422929284] [2023-11-23 21:17:12,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:12,880 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:12,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:17:12,881 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:17:12,904 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:17:13,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:13,166 INFO L262 TraceCheckSpWp]: Trace formula consists of 1030 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:17:13,173 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:17:13,220 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-11-23 21:17:13,225 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:17:13,226 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [422929284] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:17:13,226 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:17:13,226 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:17:13,227 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949998941] [2023-11-23 21:17:13,227 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:17:13,228 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:17:13,228 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:17:13,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:17:13,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:17:13,229 INFO L87 Difference]: Start difference. First operand 4595 states and 7641 transitions. Second operand has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:17:14,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:17:14,160 INFO L93 Difference]: Finished difference Result 10444 states and 16506 transitions. [2023-11-23 21:17:14,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:17:14,160 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 138 [2023-11-23 21:17:14,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:17:14,213 INFO L225 Difference]: With dead ends: 10444 [2023-11-23 21:17:14,214 INFO L226 Difference]: Without dead ends: 7495 [2023-11-23 21:17:14,228 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:17:14,229 INFO L413 NwaCegarLoop]: 3365 mSDtfsCounter, 3549 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3549 SdHoareTripleChecker+Valid, 3611 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:17:14,229 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3549 Valid, 3611 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:17:14,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7495 states. [2023-11-23 21:17:14,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7495 to 7475. [2023-11-23 21:17:14,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7475 states, 6635 states have (on average 1.5950263752825924) internal successors, (10583), 6654 states have internal predecessors, (10583), 646 states have call successors, (646), 193 states have call predecessors, (646), 192 states have return successors, (644), 628 states have call predecessors, (644), 644 states have call successors, (644) [2023-11-23 21:17:14,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7475 states to 7475 states and 11873 transitions. [2023-11-23 21:17:14,596 INFO L78 Accepts]: Start accepts. Automaton has 7475 states and 11873 transitions. Word has length 138 [2023-11-23 21:17:14,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:17:14,597 INFO L495 AbstractCegarLoop]: Abstraction has 7475 states and 11873 transitions. [2023-11-23 21:17:14,598 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:17:14,598 INFO L276 IsEmpty]: Start isEmpty. Operand 7475 states and 11873 transitions. [2023-11-23 21:17:14,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-11-23 21:17:14,613 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:17:14,614 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-11-23 21:17:14,637 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:17:14,836 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:14,836 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:17:14,836 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:17:14,837 INFO L85 PathProgramCache]: Analyzing trace with hash -910009219, now seen corresponding path program 1 times [2023-11-23 21:17:14,837 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:17:14,837 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [81406236] [2023-11-23 21:17:14,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:14,837 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:17:14,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:15,065 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:17:15,065 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:17:15,065 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [81406236] [2023-11-23 21:17:15,065 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [81406236] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:17:15,065 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494268919] [2023-11-23 21:17:15,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:15,066 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:15,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:17:15,067 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:17:15,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:17:15,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:15,336 INFO L262 TraceCheckSpWp]: Trace formula consists of 1024 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:17:15,340 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:17:15,418 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 21:17:15,419 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:17:15,419 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1494268919] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:17:15,419 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:17:15,419 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:17:15,420 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744802613] [2023-11-23 21:17:15,420 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:17:15,421 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:17:15,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:17:15,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:17:15,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:17:15,425 INFO L87 Difference]: Start difference. First operand 7475 states and 11873 transitions. Second operand has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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) [2023-11-23 21:17:16,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:17:16,234 INFO L93 Difference]: Finished difference Result 19036 states and 29322 transitions. [2023-11-23 21:17:16,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:17:16,235 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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 138 [2023-11-23 21:17:16,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:17:16,313 INFO L225 Difference]: With dead ends: 19036 [2023-11-23 21:17:16,313 INFO L226 Difference]: Without dead ends: 13207 [2023-11-23 21:17:16,337 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:17:16,338 INFO L413 NwaCegarLoop]: 3310 mSDtfsCounter, 3519 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3519 SdHoareTripleChecker+Valid, 3556 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:17:16,338 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3519 Valid, 3556 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:17:16,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13207 states. [2023-11-23 21:17:17,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13207 to 13171. [2023-11-23 21:17:17,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13171 states, 11531 states have (on average 1.535252796808603) internal successors, (17703), 11566 states have internal predecessors, (17703), 1254 states have call successors, (1254), 385 states have call predecessors, (1254), 384 states have return successors, (1252), 1220 states have call predecessors, (1252), 1252 states have call successors, (1252) [2023-11-23 21:17:17,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13171 states to 13171 states and 20209 transitions. [2023-11-23 21:17:17,099 INFO L78 Accepts]: Start accepts. Automaton has 13171 states and 20209 transitions. Word has length 138 [2023-11-23 21:17:17,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:17:17,100 INFO L495 AbstractCegarLoop]: Abstraction has 13171 states and 20209 transitions. [2023-11-23 21:17:17,100 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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) [2023-11-23 21:17:17,101 INFO L276 IsEmpty]: Start isEmpty. Operand 13171 states and 20209 transitions. [2023-11-23 21:17:17,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-11-23 21:17:17,129 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:17:17,130 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-11-23 21:17:17,165 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:17:17,345 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-23 21:17:17,345 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:17:17,345 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:17:17,345 INFO L85 PathProgramCache]: Analyzing trace with hash 595460445, now seen corresponding path program 1 times [2023-11-23 21:17:17,346 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:17:17,346 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [51281289] [2023-11-23 21:17:17,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:17,346 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:17:17,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:17,557 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:17:17,557 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:17:17,557 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [51281289] [2023-11-23 21:17:17,557 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [51281289] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:17:17,558 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1047047522] [2023-11-23 21:17:17,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:17,558 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:17,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:17:17,559 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:17:17,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:17:17,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:17,821 INFO L262 TraceCheckSpWp]: Trace formula consists of 1018 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:17:17,825 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:17:17,909 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-23 21:17:17,909 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:17:17,909 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1047047522] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:17:17,909 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:17:17,910 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:17:17,912 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992011353] [2023-11-23 21:17:17,913 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:17:17,913 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:17:17,913 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:17:17,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:17:17,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:17:17,915 INFO L87 Difference]: Start difference. First operand 13171 states and 20209 transitions. Second operand has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 2 states have internal predecessors, (110), 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) [2023-11-23 21:17:19,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:17:19,191 INFO L93 Difference]: Finished difference Result 36028 states and 54554 transitions. [2023-11-23 21:17:19,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:17:19,193 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 2 states have internal predecessors, (110), 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 138 [2023-11-23 21:17:19,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:17:19,300 INFO L225 Difference]: With dead ends: 36028 [2023-11-23 21:17:19,300 INFO L226 Difference]: Without dead ends: 24503 [2023-11-23 21:17:19,342 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:17:19,344 INFO L413 NwaCegarLoop]: 3310 mSDtfsCounter, 3522 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3522 SdHoareTripleChecker+Valid, 3556 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:17:19,344 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3522 Valid, 3556 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-23 21:17:19,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24503 states. [2023-11-23 21:17:20,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24503 to 24435. [2023-11-23 21:17:20,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24435 states, 21227 states have (on average 1.495783671738823) internal successors, (31751), 21294 states have internal predecessors, (31751), 2438 states have call successors, (2438), 769 states have call predecessors, (2438), 768 states have return successors, (2436), 2372 states have call predecessors, (2436), 2436 states have call successors, (2436) [2023-11-23 21:17:20,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24435 states to 24435 states and 36625 transitions. [2023-11-23 21:17:20,648 INFO L78 Accepts]: Start accepts. Automaton has 24435 states and 36625 transitions. Word has length 138 [2023-11-23 21:17:20,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:17:20,649 INFO L495 AbstractCegarLoop]: Abstraction has 24435 states and 36625 transitions. [2023-11-23 21:17:20,649 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 2 states have internal predecessors, (110), 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) [2023-11-23 21:17:20,650 INFO L276 IsEmpty]: Start isEmpty. Operand 24435 states and 36625 transitions. [2023-11-23 21:17:20,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-11-23 21:17:20,703 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:17:20,703 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-11-23 21:17:20,728 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 21:17:20,921 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:20,921 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:17:20,921 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:17:20,922 INFO L85 PathProgramCache]: Analyzing trace with hash 1993715837, now seen corresponding path program 1 times [2023-11-23 21:17:20,922 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:17:20,922 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [185258357] [2023-11-23 21:17:20,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:20,922 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:17:20,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:21,219 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:17:21,220 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:17:21,220 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [185258357] [2023-11-23 21:17:21,220 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [185258357] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:17:21,220 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1088028407] [2023-11-23 21:17:21,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:21,221 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:21,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:17:21,222 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:17:21,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba7c9cfc-45d8-4485-8ff8-79364a821682/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 21:17:21,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:21,504 INFO L262 TraceCheckSpWp]: Trace formula consists of 1012 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:17:21,510 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:17:21,569 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-23 21:17:21,570 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:17:21,570 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1088028407] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:17:21,570 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:17:21,570 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:17:21,571 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936209625] [2023-11-23 21:17:21,571 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:17:21,572 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:17:21,572 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:17:21,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:17:21,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:17:21,573 INFO L87 Difference]: Start difference. First operand 24435 states and 36625 transitions. Second operand has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 2 states have internal predecessors, (98), 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) [2023-11-23 21:17:23,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:17:23,750 INFO L93 Difference]: Finished difference Result 69628 states and 104218 transitions. [2023-11-23 21:17:23,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:17:23,750 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 2 states have internal predecessors, (98), 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 138 [2023-11-23 21:17:23,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:17:23,954 INFO L225 Difference]: With dead ends: 69628 [2023-11-23 21:17:23,954 INFO L226 Difference]: Without dead ends: 46839 [2023-11-23 21:17:24,015 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:17:24,015 INFO L413 NwaCegarLoop]: 3310 mSDtfsCounter, 3534 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3534 SdHoareTripleChecker+Valid, 3556 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:17:24,016 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3534 Valid, 3556 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-23 21:17:24,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46839 states.