./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.06.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc 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_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.06.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 4d0fbec14d1477738cb6d25ea9b61fc7005f787f2c8a0ac2c555d7e4fa1dbf47 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 16:42:41,172 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 16:42:41,258 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 16:42:41,263 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 16:42:41,264 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 16:42:41,292 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 16:42:41,293 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 16:42:41,294 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 16:42:41,295 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 16:42:41,295 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 16:42:41,296 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 16:42:41,297 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 16:42:41,297 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 16:42:41,298 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 16:42:41,298 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 16:42:41,299 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 16:42:41,299 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 16:42:41,300 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 16:42:41,301 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 16:42:41,301 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 16:42:41,302 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 16:42:41,303 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 16:42:41,303 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 16:42:41,304 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 16:42:41,304 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 16:42:41,305 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 16:42:41,305 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 16:42:41,306 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 16:42:41,306 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 16:42:41,307 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 16:42:41,307 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 16:42:41,308 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 16:42:41,308 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 16:42:41,308 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 16:42:41,309 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 16:42:41,309 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 16:42:41,309 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 16:42:41,309 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:42:41,309 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 16:42:41,310 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 16:42:41,310 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 16:42:41,310 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 16:42:41,311 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 16:42:41,311 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 16:42:41,311 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 16:42:41,311 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 16:42:41,311 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 16:42:41,312 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_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4d0fbec14d1477738cb6d25ea9b61fc7005f787f2c8a0ac2c555d7e4fa1dbf47 [2023-12-02 16:42:41,568 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 16:42:41,593 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 16:42:41,596 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 16:42:41,597 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 16:42:41,598 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 16:42:41,599 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/systemc/token_ring.06.cil-2.c [2023-12-02 16:42:44,459 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 16:42:44,666 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 16:42:44,667 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/sv-benchmarks/c/systemc/token_ring.06.cil-2.c [2023-12-02 16:42:44,681 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/data/b477ebc81/be23b292f17648a89159f5e0737fe532/FLAGba1b8ed2c [2023-12-02 16:42:44,695 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/data/b477ebc81/be23b292f17648a89159f5e0737fe532 [2023-12-02 16:42:44,698 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 16:42:44,700 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 16:42:44,702 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 16:42:44,702 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 16:42:44,708 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 16:42:44,709 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:42:44" (1/1) ... [2023-12-02 16:42:44,710 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@79f73589 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:42:44, skipping insertion in model container [2023-12-02 16:42:44,710 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:42:44" (1/1) ... [2023-12-02 16:42:44,767 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 16:42:44,913 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_e27787dc-975e-487b-a486-805e06670d4f/sv-benchmarks/c/systemc/token_ring.06.cil-2.c[671,684] [2023-12-02 16:42:45,006 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:42:45,019 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 16:42:45,029 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_e27787dc-975e-487b-a486-805e06670d4f/sv-benchmarks/c/systemc/token_ring.06.cil-2.c[671,684] [2023-12-02 16:42:45,068 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:42:45,090 INFO L206 MainTranslator]: Completed translation [2023-12-02 16:42:45,090 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:42:45 WrapperNode [2023-12-02 16:42:45,091 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 16:42:45,092 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 16:42:45,092 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 16:42:45,092 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 16:42:45,101 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:42:45" (1/1) ... [2023-12-02 16:42:45,114 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:42:45" (1/1) ... [2023-12-02 16:42:45,150 INFO L138 Inliner]: procedures = 40, calls = 49, calls flagged for inlining = 24, calls inlined = 24, statements flattened = 519 [2023-12-02 16:42:45,151 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 16:42:45,151 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 16:42:45,151 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 16:42:45,152 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 16:42:45,160 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:42:45" (1/1) ... [2023-12-02 16:42:45,160 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:42:45" (1/1) ... [2023-12-02 16:42:45,164 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:42:45" (1/1) ... [2023-12-02 16:42:45,164 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:42:45" (1/1) ... [2023-12-02 16:42:45,173 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:42:45" (1/1) ... [2023-12-02 16:42:45,182 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:42:45" (1/1) ... [2023-12-02 16:42:45,184 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:42:45" (1/1) ... [2023-12-02 16:42:45,187 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:42:45" (1/1) ... [2023-12-02 16:42:45,190 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 16:42:45,191 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 16:42:45,191 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 16:42:45,191 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 16:42:45,192 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:42:45" (1/1) ... [2023-12-02 16:42:45,197 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:42:45,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:42:45,221 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 16:42:45,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 16:42:45,262 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 16:42:45,262 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-12-02 16:42:45,263 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-12-02 16:42:45,263 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-12-02 16:42:45,263 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-12-02 16:42:45,263 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-12-02 16:42:45,263 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-12-02 16:42:45,263 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-12-02 16:42:45,264 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-12-02 16:42:45,264 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-12-02 16:42:45,264 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-12-02 16:42:45,264 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 16:42:45,264 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-12-02 16:42:45,265 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-12-02 16:42:45,265 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 16:42:45,265 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 16:42:45,380 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 16:42:45,382 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 16:42:45,936 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 16:42:46,250 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 16:42:46,251 INFO L309 CfgBuilder]: Removed 9 assume(true) statements. [2023-12-02 16:42:46,252 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:42:46 BoogieIcfgContainer [2023-12-02 16:42:46,253 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 16:42:46,256 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 16:42:46,256 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 16:42:46,259 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 16:42:46,259 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 04:42:44" (1/3) ... [2023-12-02 16:42:46,260 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79c8ec92 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:42:46, skipping insertion in model container [2023-12-02 16:42:46,260 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:42:45" (2/3) ... [2023-12-02 16:42:46,261 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79c8ec92 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:42:46, skipping insertion in model container [2023-12-02 16:42:46,261 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:42:46" (3/3) ... [2023-12-02 16:42:46,262 INFO L112 eAbstractionObserver]: Analyzing ICFG token_ring.06.cil-2.c [2023-12-02 16:42:46,284 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 16:42:46,284 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 16:42:46,329 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 16:42:46,336 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;@37866467, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 16:42:46,336 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 16:42:46,341 INFO L276 IsEmpty]: Start isEmpty. Operand has 129 states, 101 states have (on average 1.495049504950495) internal successors, (151), 103 states have internal predecessors, (151), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2023-12-02 16:42:46,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-12-02 16:42:46,351 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:42:46,352 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] [2023-12-02 16:42:46,352 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:42:46,357 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:42:46,357 INFO L85 PathProgramCache]: Analyzing trace with hash 1879854201, now seen corresponding path program 1 times [2023-12-02 16:42:46,369 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:42:46,369 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [801610310] [2023-12-02 16:42:46,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:42:46,370 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:42:46,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:42:46,775 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:42:46,775 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:42:46,776 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [801610310] [2023-12-02 16:42:46,776 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [801610310] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:42:46,777 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:42:46,777 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 16:42:46,778 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252769874] [2023-12-02 16:42:46,779 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:42:46,784 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 16:42:46,784 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:42:46,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 16:42:46,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:42:46,813 INFO L87 Difference]: Start difference. First operand has 129 states, 101 states have (on average 1.495049504950495) internal successors, (151), 103 states have internal predecessors, (151), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) Second operand has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 16:42:47,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:42:47,210 INFO L93 Difference]: Finished difference Result 370 states and 567 transitions. [2023-12-02 16:42:47,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 16:42:47,213 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 48 [2023-12-02 16:42:47,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:42:47,225 INFO L225 Difference]: With dead ends: 370 [2023-12-02 16:42:47,226 INFO L226 Difference]: Without dead ends: 242 [2023-12-02 16:42:47,232 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:42:47,236 INFO L413 NwaCegarLoop]: 288 mSDtfsCounter, 324 mSDsluCounter, 214 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 324 SdHoareTripleChecker+Valid, 502 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 16:42:47,237 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [324 Valid, 502 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 16:42:47,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2023-12-02 16:42:47,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 241. [2023-12-02 16:42:47,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 192 states have (on average 1.4270833333333333) internal successors, (274), 194 states have internal predecessors, (274), 36 states have call successors, (36), 12 states have call predecessors, (36), 12 states have return successors, (36), 35 states have call predecessors, (36), 36 states have call successors, (36) [2023-12-02 16:42:47,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 346 transitions. [2023-12-02 16:42:47,311 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 346 transitions. Word has length 48 [2023-12-02 16:42:47,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:42:47,312 INFO L495 AbstractCegarLoop]: Abstraction has 241 states and 346 transitions. [2023-12-02 16:42:47,312 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 16:42:47,312 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 346 transitions. [2023-12-02 16:42:47,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2023-12-02 16:42:47,320 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:42:47,320 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:42:47,321 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 16:42:47,321 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:42:47,322 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:42:47,322 INFO L85 PathProgramCache]: Analyzing trace with hash -767026456, now seen corresponding path program 1 times [2023-12-02 16:42:47,322 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:42:47,323 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1697774503] [2023-12-02 16:42:47,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:42:47,323 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:42:47,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:42:47,566 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 16:42:47,566 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:42:47,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1697774503] [2023-12-02 16:42:47,567 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1697774503] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:42:47,567 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2097894452] [2023-12-02 16:42:47,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:42:47,567 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:42:47,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:42:47,569 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:42:47,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 16:42:47,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:42:47,769 INFO L262 TraceCheckSpWp]: Trace formula consists of 575 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:42:47,778 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:42:47,840 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 16:42:47,841 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:42:47,841 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2097894452] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:42:47,842 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:42:47,842 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 16:42:47,843 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070440539] [2023-12-02 16:42:47,843 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:42:47,845 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:42:47,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:42:47,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:42:47,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:42:47,847 INFO L87 Difference]: Start difference. First operand 241 states and 346 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:42:47,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:42:47,988 INFO L93 Difference]: Finished difference Result 706 states and 1029 transitions. [2023-12-02 16:42:47,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:42:47,989 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 94 [2023-12-02 16:42:47,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:42:47,996 INFO L225 Difference]: With dead ends: 706 [2023-12-02 16:42:47,996 INFO L226 Difference]: Without dead ends: 470 [2023-12-02 16:42:47,998 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:42:48,000 INFO L413 NwaCegarLoop]: 192 mSDtfsCounter, 160 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 334 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:42:48,000 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [160 Valid, 334 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:42:48,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2023-12-02 16:42:48,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 466. [2023-12-02 16:42:48,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 375 states have (on average 1.4213333333333333) internal successors, (533), 378 states have internal predecessors, (533), 66 states have call successors, (66), 24 states have call predecessors, (66), 24 states have return successors, (66), 64 states have call predecessors, (66), 66 states have call successors, (66) [2023-12-02 16:42:48,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 665 transitions. [2023-12-02 16:42:48,057 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 665 transitions. Word has length 94 [2023-12-02 16:42:48,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:42:48,058 INFO L495 AbstractCegarLoop]: Abstraction has 466 states and 665 transitions. [2023-12-02 16:42:48,058 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:42:48,058 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 665 transitions. [2023-12-02 16:42:48,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2023-12-02 16:42:48,063 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:42:48,064 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:42:48,071 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 16:42:48,267 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:42:48,268 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:42:48,268 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:42:48,269 INFO L85 PathProgramCache]: Analyzing trace with hash 1293859784, now seen corresponding path program 1 times [2023-12-02 16:42:48,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:42:48,269 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1228058511] [2023-12-02 16:42:48,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:42:48,270 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:42:48,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:42:48,464 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 16:42:48,464 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:42:48,465 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1228058511] [2023-12-02 16:42:48,465 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1228058511] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:42:48,465 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2026950465] [2023-12-02 16:42:48,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:42:48,466 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:42:48,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:42:48,467 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:42:48,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 16:42:48,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:42:48,674 INFO L262 TraceCheckSpWp]: Trace formula consists of 569 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:42:48,680 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:42:48,735 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 16:42:48,735 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:42:48,735 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2026950465] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:42:48,736 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:42:48,736 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 16:42:48,736 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435649630] [2023-12-02 16:42:48,736 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:42:48,737 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:42:48,737 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:42:48,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:42:48,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:42:48,739 INFO L87 Difference]: Start difference. First operand 466 states and 665 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:42:48,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:42:48,880 INFO L93 Difference]: Finished difference Result 1375 states and 1992 transitions. [2023-12-02 16:42:48,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:42:48,880 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 94 [2023-12-02 16:42:48,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:42:48,888 INFO L225 Difference]: With dead ends: 1375 [2023-12-02 16:42:48,888 INFO L226 Difference]: Without dead ends: 914 [2023-12-02 16:42:48,890 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:42:48,891 INFO L413 NwaCegarLoop]: 190 mSDtfsCounter, 157 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:42:48,892 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [157 Valid, 332 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:42:48,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 914 states. [2023-12-02 16:42:48,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 914 to 908. [2023-12-02 16:42:48,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 908 states, 735 states have (on average 1.4136054421768707) internal successors, (1039), 740 states have internal predecessors, (1039), 124 states have call successors, (124), 48 states have call predecessors, (124), 48 states have return successors, (124), 120 states have call predecessors, (124), 124 states have call successors, (124) [2023-12-02 16:42:48,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 908 states to 908 states and 1287 transitions. [2023-12-02 16:42:48,948 INFO L78 Accepts]: Start accepts. Automaton has 908 states and 1287 transitions. Word has length 94 [2023-12-02 16:42:48,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:42:48,949 INFO L495 AbstractCegarLoop]: Abstraction has 908 states and 1287 transitions. [2023-12-02 16:42:48,949 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:42:48,949 INFO L276 IsEmpty]: Start isEmpty. Operand 908 states and 1287 transitions. [2023-12-02 16:42:48,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2023-12-02 16:42:48,953 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:42:48,954 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:42:48,960 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 16:42:49,155 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:42:49,156 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:42:49,156 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:42:49,156 INFO L85 PathProgramCache]: Analyzing trace with hash -329857304, now seen corresponding path program 1 times [2023-12-02 16:42:49,156 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:42:49,157 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [453954958] [2023-12-02 16:42:49,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:42:49,157 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:42:49,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:42:49,298 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 16:42:49,299 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:42:49,299 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [453954958] [2023-12-02 16:42:49,299 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [453954958] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:42:49,299 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1735316964] [2023-12-02 16:42:49,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:42:49,300 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:42:49,300 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:42:49,301 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:42:49,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 16:42:49,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:42:49,467 INFO L262 TraceCheckSpWp]: Trace formula consists of 563 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:42:49,472 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:42:49,520 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 16:42:49,520 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:42:49,521 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1735316964] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:42:49,521 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:42:49,521 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 16:42:49,521 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246266973] [2023-12-02 16:42:49,521 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:42:49,522 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:42:49,522 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:42:49,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:42:49,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:42:49,523 INFO L87 Difference]: Start difference. First operand 908 states and 1287 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:42:49,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:42:49,696 INFO L93 Difference]: Finished difference Result 2689 states and 3868 transitions. [2023-12-02 16:42:49,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:42:49,697 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 94 [2023-12-02 16:42:49,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:42:49,711 INFO L225 Difference]: With dead ends: 2689 [2023-12-02 16:42:49,711 INFO L226 Difference]: Without dead ends: 1786 [2023-12-02 16:42:49,715 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:42:49,716 INFO L413 NwaCegarLoop]: 151 mSDtfsCounter, 151 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:42:49,716 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [151 Valid, 293 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:42:49,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1786 states. [2023-12-02 16:42:49,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1786 to 1776. [2023-12-02 16:42:49,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1776 states, 1443 states have (on average 1.4047124047124047) internal successors, (2027), 1452 states have internal predecessors, (2027), 236 states have call successors, (236), 96 states have call predecessors, (236), 96 states have return successors, (236), 228 states have call predecessors, (236), 236 states have call successors, (236) [2023-12-02 16:42:49,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1776 states to 1776 states and 2499 transitions. [2023-12-02 16:42:49,835 INFO L78 Accepts]: Start accepts. Automaton has 1776 states and 2499 transitions. Word has length 94 [2023-12-02 16:42:49,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:42:49,835 INFO L495 AbstractCegarLoop]: Abstraction has 1776 states and 2499 transitions. [2023-12-02 16:42:49,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:42:49,836 INFO L276 IsEmpty]: Start isEmpty. Operand 1776 states and 2499 transitions. [2023-12-02 16:42:49,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2023-12-02 16:42:49,842 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:42:49,842 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:42:49,849 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-12-02 16:42:50,042 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:42:50,043 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:42:50,043 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:42:50,043 INFO L85 PathProgramCache]: Analyzing trace with hash 750627336, now seen corresponding path program 1 times [2023-12-02 16:42:50,044 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:42:50,044 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836276643] [2023-12-02 16:42:50,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:42:50,044 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:42:50,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:42:50,136 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 16:42:50,136 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:42:50,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [836276643] [2023-12-02 16:42:50,137 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [836276643] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:42:50,137 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:42:50,137 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:42:50,137 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621812109] [2023-12-02 16:42:50,137 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:42:50,138 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:42:50,138 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:42:50,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:42:50,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:42:50,139 INFO L87 Difference]: Start difference. First operand 1776 states and 2499 transitions. Second operand has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 16:42:50,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:42:50,298 INFO L93 Difference]: Finished difference Result 3178 states and 4524 transitions. [2023-12-02 16:42:50,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:42:50,299 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 94 [2023-12-02 16:42:50,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:42:50,313 INFO L225 Difference]: With dead ends: 3178 [2023-12-02 16:42:50,313 INFO L226 Difference]: Without dead ends: 2272 [2023-12-02 16:42:50,316 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:42:50,317 INFO L413 NwaCegarLoop]: 235 mSDtfsCounter, 79 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 393 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:42:50,317 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 393 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:42:50,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2272 states. [2023-12-02 16:42:50,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2272 to 2116. [2023-12-02 16:42:50,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2116 states, 1767 states have (on average 1.4368986983588001) internal successors, (2539), 1776 states have internal predecessors, (2539), 244 states have call successors, (244), 104 states have call predecessors, (244), 104 states have return successors, (244), 236 states have call predecessors, (244), 244 states have call successors, (244) [2023-12-02 16:42:50,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2116 states to 2116 states and 3027 transitions. [2023-12-02 16:42:50,434 INFO L78 Accepts]: Start accepts. Automaton has 2116 states and 3027 transitions. Word has length 94 [2023-12-02 16:42:50,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:42:50,435 INFO L495 AbstractCegarLoop]: Abstraction has 2116 states and 3027 transitions. [2023-12-02 16:42:50,435 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 16:42:50,435 INFO L276 IsEmpty]: Start isEmpty. Operand 2116 states and 3027 transitions. [2023-12-02 16:42:50,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2023-12-02 16:42:50,441 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:42:50,441 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:42:50,441 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-12-02 16:42:50,441 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:42:50,442 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:42:50,442 INFO L85 PathProgramCache]: Analyzing trace with hash 560040582, now seen corresponding path program 1 times [2023-12-02 16:42:50,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:42:50,442 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1625019779] [2023-12-02 16:42:50,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:42:50,443 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:42:50,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:42:50,515 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-12-02 16:42:50,515 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:42:50,515 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1625019779] [2023-12-02 16:42:50,515 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1625019779] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:42:50,516 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:42:50,516 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:42:50,516 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376152938] [2023-12-02 16:42:50,516 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:42:50,516 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:42:50,517 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:42:50,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:42:50,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:42:50,518 INFO L87 Difference]: Start difference. First operand 2116 states and 3027 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:42:50,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:42:50,760 INFO L93 Difference]: Finished difference Result 6265 states and 9056 transitions. [2023-12-02 16:42:50,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:42:50,761 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 127 [2023-12-02 16:42:50,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:42:50,783 INFO L225 Difference]: With dead ends: 6265 [2023-12-02 16:42:50,783 INFO L226 Difference]: Without dead ends: 4154 [2023-12-02 16:42:50,788 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:42:50,789 INFO L413 NwaCegarLoop]: 153 mSDtfsCounter, 148 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 295 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:42:50,790 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [148 Valid, 295 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:42:50,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4154 states. [2023-12-02 16:42:50,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4154 to 4128. [2023-12-02 16:42:50,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4128 states, 3451 states have (on average 1.4242248623587366) internal successors, (4915), 3468 states have internal predecessors, (4915), 468 states have call successors, (468), 208 states have call predecessors, (468), 208 states have return successors, (468), 452 states have call predecessors, (468), 468 states have call successors, (468) [2023-12-02 16:42:50,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4128 states to 4128 states and 5851 transitions. [2023-12-02 16:42:50,964 INFO L78 Accepts]: Start accepts. Automaton has 4128 states and 5851 transitions. Word has length 127 [2023-12-02 16:42:50,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:42:50,964 INFO L495 AbstractCegarLoop]: Abstraction has 4128 states and 5851 transitions. [2023-12-02 16:42:50,964 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:42:50,965 INFO L276 IsEmpty]: Start isEmpty. Operand 4128 states and 5851 transitions. [2023-12-02 16:42:50,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2023-12-02 16:42:50,975 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:42:50,975 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:42:50,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-12-02 16:42:50,975 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:42:50,976 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:42:50,976 INFO L85 PathProgramCache]: Analyzing trace with hash 1644854187, now seen corresponding path program 1 times [2023-12-02 16:42:50,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:42:50,976 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2141326292] [2023-12-02 16:42:50,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:42:50,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:42:51,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:42:51,089 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-12-02 16:42:51,089 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:42:51,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2141326292] [2023-12-02 16:42:51,089 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2141326292] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:42:51,090 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:42:51,090 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:42:51,090 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273557683] [2023-12-02 16:42:51,090 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:42:51,090 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:42:51,091 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:42:51,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:42:51,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:42:51,092 INFO L87 Difference]: Start difference. First operand 4128 states and 5851 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:42:51,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:42:51,523 INFO L93 Difference]: Finished difference Result 12229 states and 17504 transitions. [2023-12-02 16:42:51,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:42:51,524 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 127 [2023-12-02 16:42:51,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:42:51,570 INFO L225 Difference]: With dead ends: 12229 [2023-12-02 16:42:51,570 INFO L226 Difference]: Without dead ends: 8106 [2023-12-02 16:42:51,581 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:42:51,582 INFO L413 NwaCegarLoop]: 153 mSDtfsCounter, 150 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 295 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:42:51,583 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 295 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:42:51,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8106 states. [2023-12-02 16:42:51,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8106 to 8056. [2023-12-02 16:42:51,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8056 states, 6739 states have (on average 1.410743433743879) internal successors, (9507), 6772 states have internal predecessors, (9507), 900 states have call successors, (900), 416 states have call predecessors, (900), 416 states have return successors, (900), 868 states have call predecessors, (900), 900 states have call successors, (900) [2023-12-02 16:42:52,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8056 states to 8056 states and 11307 transitions. [2023-12-02 16:42:52,045 INFO L78 Accepts]: Start accepts. Automaton has 8056 states and 11307 transitions. Word has length 127 [2023-12-02 16:42:52,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:42:52,045 INFO L495 AbstractCegarLoop]: Abstraction has 8056 states and 11307 transitions. [2023-12-02 16:42:52,046 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:42:52,046 INFO L276 IsEmpty]: Start isEmpty. Operand 8056 states and 11307 transitions. [2023-12-02 16:42:52,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2023-12-02 16:42:52,076 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:42:52,077 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:42:52,077 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-12-02 16:42:52,077 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:42:52,077 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:42:52,078 INFO L85 PathProgramCache]: Analyzing trace with hash 237573985, now seen corresponding path program 1 times [2023-12-02 16:42:52,078 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:42:52,078 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250855189] [2023-12-02 16:42:52,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:42:52,078 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:42:52,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:42:52,175 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-12-02 16:42:52,175 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:42:52,175 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250855189] [2023-12-02 16:42:52,175 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250855189] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:42:52,175 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:42:52,176 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:42:52,176 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895842159] [2023-12-02 16:42:52,176 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:42:52,177 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:42:52,177 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:42:52,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:42:52,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:42:52,178 INFO L87 Difference]: Start difference. First operand 8056 states and 11307 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:42:52,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:42:52,964 INFO L93 Difference]: Finished difference Result 23869 states and 33808 transitions. [2023-12-02 16:42:52,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:42:52,968 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 127 [2023-12-02 16:42:52,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:42:53,070 INFO L225 Difference]: With dead ends: 23869 [2023-12-02 16:42:53,071 INFO L226 Difference]: Without dead ends: 15818 [2023-12-02 16:42:53,105 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:42:53,106 INFO L413 NwaCegarLoop]: 171 mSDtfsCounter, 153 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 313 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:42:53,107 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [153 Valid, 313 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:42:53,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15818 states. [2023-12-02 16:42:53,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15818 to 15720. [2023-12-02 16:42:54,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15720 states, 13155 states have (on average 1.3965032307107563) internal successors, (18371), 13220 states have internal predecessors, (18371), 1732 states have call successors, (1732), 832 states have call predecessors, (1732), 832 states have return successors, (1732), 1668 states have call predecessors, (1732), 1732 states have call successors, (1732) [2023-12-02 16:42:54,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15720 states to 15720 states and 21835 transitions. [2023-12-02 16:42:54,079 INFO L78 Accepts]: Start accepts. Automaton has 15720 states and 21835 transitions. Word has length 127 [2023-12-02 16:42:54,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:42:54,079 INFO L495 AbstractCegarLoop]: Abstraction has 15720 states and 21835 transitions. [2023-12-02 16:42:54,081 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:42:54,081 INFO L276 IsEmpty]: Start isEmpty. Operand 15720 states and 21835 transitions. [2023-12-02 16:42:54,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2023-12-02 16:42:54,149 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:42:54,149 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 16:42:54,149 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-12-02 16:42:54,149 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:42:54,150 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:42:54,150 INFO L85 PathProgramCache]: Analyzing trace with hash -1544723639, now seen corresponding path program 1 times [2023-12-02 16:42:54,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:42:54,150 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435880738] [2023-12-02 16:42:54,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:42:54,151 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:42:54,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:42:54,317 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 21 proven. 6 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2023-12-02 16:42:54,318 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:42:54,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435880738] [2023-12-02 16:42:54,318 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [435880738] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:42:54,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308894612] [2023-12-02 16:42:54,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:42:54,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:42:54,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:42:54,320 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:42:54,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 16:42:54,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:42:54,537 INFO L262 TraceCheckSpWp]: Trace formula consists of 759 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:42:54,594 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:42:54,636 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 16:42:54,636 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:42:54,637 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [308894612] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:42:54,637 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:42:54,637 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 16:42:54,637 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998458227] [2023-12-02 16:42:54,637 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:42:54,638 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:42:54,638 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:42:54,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:42:54,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:42:54,640 INFO L87 Difference]: Start difference. First operand 15720 states and 21835 transitions. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:42:55,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:42:55,574 INFO L93 Difference]: Finished difference Result 30028 states and 42157 transitions. [2023-12-02 16:42:55,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:42:55,575 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 148 [2023-12-02 16:42:55,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:42:55,643 INFO L225 Difference]: With dead ends: 30028 [2023-12-02 16:42:55,643 INFO L226 Difference]: Without dead ends: 21978 [2023-12-02 16:42:55,665 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:42:55,666 INFO L413 NwaCegarLoop]: 263 mSDtfsCounter, 116 mSDsluCounter, 159 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 422 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:42:55,666 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [116 Valid, 422 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:42:55,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21978 states. [2023-12-02 16:42:56,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21978 to 19256. [2023-12-02 16:42:56,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19256 states, 16499 states have (on average 1.425722771077035) internal successors, (23523), 16564 states have internal predecessors, (23523), 1828 states have call successors, (1828), 928 states have call predecessors, (1828), 928 states have return successors, (1828), 1764 states have call predecessors, (1828), 1828 states have call successors, (1828) [2023-12-02 16:42:56,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19256 states to 19256 states and 27179 transitions. [2023-12-02 16:42:56,548 INFO L78 Accepts]: Start accepts. Automaton has 19256 states and 27179 transitions. Word has length 148 [2023-12-02 16:42:56,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:42:56,549 INFO L495 AbstractCegarLoop]: Abstraction has 19256 states and 27179 transitions. [2023-12-02 16:42:56,549 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:42:56,549 INFO L276 IsEmpty]: Start isEmpty. Operand 19256 states and 27179 transitions. [2023-12-02 16:42:56,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2023-12-02 16:42:56,596 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:42:56,596 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 16:42:56,602 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-12-02 16:42:56,797 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:42:56,797 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:42:56,797 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:42:56,797 INFO L85 PathProgramCache]: Analyzing trace with hash -639218137, now seen corresponding path program 2 times [2023-12-02 16:42:56,798 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:42:56,798 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1928157713] [2023-12-02 16:42:56,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:42:56,798 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:42:56,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:42:57,156 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 10 proven. 45 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-12-02 16:42:57,157 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:42:57,157 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1928157713] [2023-12-02 16:42:57,157 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1928157713] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:42:57,157 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [842401538] [2023-12-02 16:42:57,158 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:42:57,158 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:42:57,158 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:42:57,160 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:42:57,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 16:42:57,338 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 16:42:57,338 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:42:57,341 INFO L262 TraceCheckSpWp]: Trace formula consists of 479 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:42:57,346 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:42:57,392 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2023-12-02 16:42:57,393 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:42:57,393 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [842401538] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:42:57,393 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:42:57,393 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:42:57,394 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92222673] [2023-12-02 16:42:57,394 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:42:57,394 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:42:57,394 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:42:57,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:42:57,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:42:57,396 INFO L87 Difference]: Start difference. First operand 19256 states and 27179 transitions. Second operand has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:42:58,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:42:58,230 INFO L93 Difference]: Finished difference Result 30908 states and 44365 transitions. [2023-12-02 16:42:58,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:42:58,231 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 148 [2023-12-02 16:42:58,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:42:58,316 INFO L225 Difference]: With dead ends: 30908 [2023-12-02 16:42:58,317 INFO L226 Difference]: Without dead ends: 19322 [2023-12-02 16:42:58,355 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:42:58,356 INFO L413 NwaCegarLoop]: 284 mSDtfsCounter, 148 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 429 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:42:58,356 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [148 Valid, 429 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:42:58,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19322 states. [2023-12-02 16:42:59,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19322 to 19192. [2023-12-02 16:42:59,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19192 states, 16435 states have (on average 1.4118040766656526) internal successors, (23203), 16500 states have internal predecessors, (23203), 1828 states have call successors, (1828), 928 states have call predecessors, (1828), 928 states have return successors, (1828), 1764 states have call predecessors, (1828), 1828 states have call successors, (1828) [2023-12-02 16:42:59,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19192 states to 19192 states and 26859 transitions. [2023-12-02 16:42:59,307 INFO L78 Accepts]: Start accepts. Automaton has 19192 states and 26859 transitions. Word has length 148 [2023-12-02 16:42:59,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:42:59,307 INFO L495 AbstractCegarLoop]: Abstraction has 19192 states and 26859 transitions. [2023-12-02 16:42:59,308 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:42:59,308 INFO L276 IsEmpty]: Start isEmpty. Operand 19192 states and 26859 transitions. [2023-12-02 16:42:59,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2023-12-02 16:42:59,346 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:42:59,347 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 16:42:59,352 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 16:42:59,547 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 16:42:59,548 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:42:59,548 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:42:59,549 INFO L85 PathProgramCache]: Analyzing trace with hash -2054212281, now seen corresponding path program 1 times [2023-12-02 16:42:59,549 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:42:59,549 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1294598648] [2023-12-02 16:42:59,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:42:59,549 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:42:59,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:42:59,921 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-12-02 16:42:59,921 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:42:59,921 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1294598648] [2023-12-02 16:42:59,922 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1294598648] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:42:59,922 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [519803001] [2023-12-02 16:42:59,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:42:59,922 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:42:59,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:42:59,923 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:42:59,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 16:43:00,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:00,133 INFO L262 TraceCheckSpWp]: Trace formula consists of 765 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:43:00,138 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:43:00,195 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 16:43:00,195 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:43:00,195 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [519803001] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:43:00,195 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:43:00,195 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:43:00,196 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108618186] [2023-12-02 16:43:00,196 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:43:00,197 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:43:00,197 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:43:00,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:43:00,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:43:00,198 INFO L87 Difference]: Start difference. First operand 19192 states and 26859 transitions. Second operand has 3 states, 3 states have (on average 36.0) internal successors, (108), 3 states have internal predecessors, (108), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:43:01,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:43:01,033 INFO L93 Difference]: Finished difference Result 29092 states and 41309 transitions. [2023-12-02 16:43:01,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:43:01,034 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.0) internal successors, (108), 3 states have internal predecessors, (108), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 148 [2023-12-02 16:43:01,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:43:01,082 INFO L225 Difference]: With dead ends: 29092 [2023-12-02 16:43:01,083 INFO L226 Difference]: Without dead ends: 19258 [2023-12-02 16:43:01,100 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:43:01,100 INFO L413 NwaCegarLoop]: 267 mSDtfsCounter, 143 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 411 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:43:01,101 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [143 Valid, 411 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:43:01,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19258 states. [2023-12-02 16:43:01,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19258 to 19032. [2023-12-02 16:43:01,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19032 states, 16275 states have (on average 1.3942242703533025) internal successors, (22691), 16340 states have internal predecessors, (22691), 1828 states have call successors, (1828), 928 states have call predecessors, (1828), 928 states have return successors, (1828), 1764 states have call predecessors, (1828), 1828 states have call successors, (1828) [2023-12-02 16:43:01,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19032 states to 19032 states and 26347 transitions. [2023-12-02 16:43:01,874 INFO L78 Accepts]: Start accepts. Automaton has 19032 states and 26347 transitions. Word has length 148 [2023-12-02 16:43:01,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:43:01,874 INFO L495 AbstractCegarLoop]: Abstraction has 19032 states and 26347 transitions. [2023-12-02 16:43:01,874 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.0) internal successors, (108), 3 states have internal predecessors, (108), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:43:01,874 INFO L276 IsEmpty]: Start isEmpty. Operand 19032 states and 26347 transitions. [2023-12-02 16:43:01,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2023-12-02 16:43:01,905 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:43:01,905 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:43:01,911 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 16:43:02,105 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:43:02,106 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:43:02,106 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:43:02,106 INFO L85 PathProgramCache]: Analyzing trace with hash -430495193, now seen corresponding path program 1 times [2023-12-02 16:43:02,107 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:43:02,107 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1500341548] [2023-12-02 16:43:02,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:02,107 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:43:02,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:02,465 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 10 proven. 41 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-12-02 16:43:02,466 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:43:02,466 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1500341548] [2023-12-02 16:43:02,466 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1500341548] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:43:02,466 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1843623280] [2023-12-02 16:43:02,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:02,466 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:43:02,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:43:02,468 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:43:02,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 16:43:02,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:02,691 INFO L262 TraceCheckSpWp]: Trace formula consists of 771 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:43:02,695 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:43:02,738 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-12-02 16:43:02,738 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:43:02,738 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1843623280] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:43:02,738 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:43:02,739 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:43:02,739 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245137416] [2023-12-02 16:43:02,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:43:02,739 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:43:02,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:43:02,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:43:02,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:43:02,741 INFO L87 Difference]: Start difference. First operand 19032 states and 26347 transitions. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:43:03,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:43:03,422 INFO L93 Difference]: Finished difference Result 32396 states and 44422 transitions. [2023-12-02 16:43:03,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:43:03,423 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 148 [2023-12-02 16:43:03,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:43:03,492 INFO L225 Difference]: With dead ends: 32396 [2023-12-02 16:43:03,493 INFO L226 Difference]: Without dead ends: 22802 [2023-12-02 16:43:03,517 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:43:03,518 INFO L413 NwaCegarLoop]: 172 mSDtfsCounter, 155 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:43:03,518 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 211 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:43:03,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22802 states. [2023-12-02 16:43:04,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22802 to 22802. [2023-12-02 16:43:04,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22802 states, 19665 states have (on average 1.3588100686498856) internal successors, (26721), 19730 states have internal predecessors, (26721), 1954 states have call successors, (1954), 1182 states have call predecessors, (1954), 1182 states have return successors, (1954), 1890 states have call predecessors, (1954), 1954 states have call successors, (1954) [2023-12-02 16:43:04,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22802 states to 22802 states and 30629 transitions. [2023-12-02 16:43:04,692 INFO L78 Accepts]: Start accepts. Automaton has 22802 states and 30629 transitions. Word has length 148 [2023-12-02 16:43:04,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:43:04,692 INFO L495 AbstractCegarLoop]: Abstraction has 22802 states and 30629 transitions. [2023-12-02 16:43:04,692 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:43:04,693 INFO L276 IsEmpty]: Start isEmpty. Operand 22802 states and 30629 transitions. [2023-12-02 16:43:04,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2023-12-02 16:43:04,737 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:43:04,738 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:43:04,744 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 16:43:04,938 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 16:43:04,939 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:43:04,939 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:43:04,939 INFO L85 PathProgramCache]: Analyzing trace with hash 1374244853, now seen corresponding path program 1 times [2023-12-02 16:43:04,939 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:43:04,939 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47831443] [2023-12-02 16:43:04,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:04,940 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:43:04,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:05,653 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 12 proven. 44 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2023-12-02 16:43:05,654 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:43:05,654 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47831443] [2023-12-02 16:43:05,654 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [47831443] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:43:05,654 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1673223325] [2023-12-02 16:43:05,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:05,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:43:05,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:43:05,656 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:43:05,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 16:43:05,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:05,905 INFO L262 TraceCheckSpWp]: Trace formula consists of 862 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 16:43:05,911 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:43:06,147 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 70 proven. 17 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-12-02 16:43:06,147 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:43:06,650 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 13 proven. 44 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-12-02 16:43:06,650 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1673223325] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:43:06,650 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [976282091] [2023-12-02 16:43:06,678 INFO L159 IcfgInterpreter]: Started Sifa with 77 locations of interest [2023-12-02 16:43:06,679 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:43:06,683 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:43:06,690 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:43:06,690 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:43:16,692 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 150 for LOIs [2023-12-02 16:43:16,851 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 150 for LOIs [2023-12-02 16:43:16,975 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 1 for LOIs [2023-12-02 16:43:16,976 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 16:43:16,997 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 52 for LOIs [2023-12-02 16:43:17,096 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 1 for LOIs [2023-12-02 16:43:17,291 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:43:25,522 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '351308#(and (<= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483647) (= |ULTIMATE.start_start_simulation_~kernel_st~0#1| 1) (<= |ULTIMATE.start_eval_~tmp~0#1| 1) (<= 0 (+ |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483648)) (not (= |ULTIMATE.start_eval_~tmp~0#1| 0)) (= ~m_pc~0 1) (not (= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 0)) (= ~m_st~0 1) (not (= ~token~0 (+ 6 ~local~0))) (<= 0 |ULTIMATE.start_eval_~tmp~0#1|))' at error location [2023-12-02 16:43:25,522 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:43:25,523 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:43:25,523 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 9 [2023-12-02 16:43:25,523 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286975274] [2023-12-02 16:43:25,523 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:43:25,524 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 16:43:25,524 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:43:25,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 16:43:25,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=405, Invalid=4565, Unknown=0, NotChecked=0, Total=4970 [2023-12-02 16:43:25,527 INFO L87 Difference]: Start difference. First operand 22802 states and 30629 transitions. Second operand has 9 states, 9 states have (on average 17.666666666666668) internal successors, (159), 9 states have internal predecessors, (159), 5 states have call successors, (28), 6 states have call predecessors, (28), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) [2023-12-02 16:43:26,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:43:26,932 INFO L93 Difference]: Finished difference Result 58082 states and 77787 transitions. [2023-12-02 16:43:26,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 16:43:26,933 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 17.666666666666668) internal successors, (159), 9 states have internal predecessors, (159), 5 states have call successors, (28), 6 states have call predecessors, (28), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) Word has length 147 [2023-12-02 16:43:26,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:43:27,045 INFO L225 Difference]: With dead ends: 58082 [2023-12-02 16:43:27,045 INFO L226 Difference]: Without dead ends: 35286 [2023-12-02 16:43:27,104 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 387 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2062 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=466, Invalid=5386, Unknown=0, NotChecked=0, Total=5852 [2023-12-02 16:43:27,105 INFO L413 NwaCegarLoop]: 164 mSDtfsCounter, 512 mSDsluCounter, 370 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 527 SdHoareTripleChecker+Valid, 534 SdHoareTripleChecker+Invalid, 344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 16:43:27,105 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [527 Valid, 534 Invalid, 344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 16:43:27,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35286 states. [2023-12-02 16:43:28,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35286 to 33844. [2023-12-02 16:43:28,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33844 states, 29175 states have (on average 1.3490659811482433) internal successors, (39359), 29272 states have internal predecessors, (39359), 2896 states have call successors, (2896), 1772 states have call predecessors, (2896), 1772 states have return successors, (2896), 2800 states have call predecessors, (2896), 2896 states have call successors, (2896) [2023-12-02 16:43:28,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33844 states to 33844 states and 45151 transitions. [2023-12-02 16:43:28,435 INFO L78 Accepts]: Start accepts. Automaton has 33844 states and 45151 transitions. Word has length 147 [2023-12-02 16:43:28,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:43:28,435 INFO L495 AbstractCegarLoop]: Abstraction has 33844 states and 45151 transitions. [2023-12-02 16:43:28,436 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 17.666666666666668) internal successors, (159), 9 states have internal predecessors, (159), 5 states have call successors, (28), 6 states have call predecessors, (28), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) [2023-12-02 16:43:28,436 INFO L276 IsEmpty]: Start isEmpty. Operand 33844 states and 45151 transitions. [2023-12-02 16:43:28,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2023-12-02 16:43:28,482 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:43:28,482 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:43:28,489 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 16:43:28,682 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 16:43:28,683 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:43:28,683 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:43:28,683 INFO L85 PathProgramCache]: Analyzing trace with hash -87598312, now seen corresponding path program 1 times [2023-12-02 16:43:28,683 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:43:28,683 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [865490670] [2023-12-02 16:43:28,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:28,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:43:28,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:28,885 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 42 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-12-02 16:43:28,885 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:43:28,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [865490670] [2023-12-02 16:43:28,886 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [865490670] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:43:28,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1554451422] [2023-12-02 16:43:28,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:28,886 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:43:28,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:43:28,887 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:43:28,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 16:43:29,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:29,077 INFO L262 TraceCheckSpWp]: Trace formula consists of 770 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 16:43:29,081 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:43:29,120 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 16:43:29,120 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:43:29,120 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1554451422] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:43:29,120 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:43:29,121 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2023-12-02 16:43:29,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686070912] [2023-12-02 16:43:29,121 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:43:29,121 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 16:43:29,122 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:43:29,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 16:43:29,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-12-02 16:43:29,123 INFO L87 Difference]: Start difference. First operand 33844 states and 45151 transitions. Second operand has 4 states, 4 states have (on average 29.75) internal successors, (119), 4 states have internal predecessors, (119), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 16:43:30,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:43:30,111 INFO L93 Difference]: Finished difference Result 48589 states and 64925 transitions. [2023-12-02 16:43:30,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 16:43:30,111 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 29.75) internal successors, (119), 4 states have internal predecessors, (119), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 149 [2023-12-02 16:43:30,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:43:30,194 INFO L225 Difference]: With dead ends: 48589 [2023-12-02 16:43:30,194 INFO L226 Difference]: Without dead ends: 35502 [2023-12-02 16:43:30,219 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2023-12-02 16:43:30,220 INFO L413 NwaCegarLoop]: 219 mSDtfsCounter, 142 mSDsluCounter, 362 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 581 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:43:30,220 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [142 Valid, 581 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:43:30,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35502 states. [2023-12-02 16:43:31,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35502 to 35271. [2023-12-02 16:43:31,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35271 states, 30461 states have (on average 1.3438495124913825) internal successors, (40935), 30622 states have internal predecessors, (40935), 2904 states have call successors, (2904), 1777 states have call predecessors, (2904), 1905 states have return successors, (3032), 2872 states have call predecessors, (3032), 2904 states have call successors, (3032) [2023-12-02 16:43:31,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35271 states to 35271 states and 46871 transitions. [2023-12-02 16:43:31,521 INFO L78 Accepts]: Start accepts. Automaton has 35271 states and 46871 transitions. Word has length 149 [2023-12-02 16:43:31,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:43:31,521 INFO L495 AbstractCegarLoop]: Abstraction has 35271 states and 46871 transitions. [2023-12-02 16:43:31,522 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 29.75) internal successors, (119), 4 states have internal predecessors, (119), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 16:43:31,522 INFO L276 IsEmpty]: Start isEmpty. Operand 35271 states and 46871 transitions. [2023-12-02 16:43:31,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2023-12-02 16:43:31,568 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:43:31,569 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:43:31,576 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-12-02 16:43:31,769 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:43:31,769 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:43:31,770 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:43:31,770 INFO L85 PathProgramCache]: Analyzing trace with hash 1458884151, now seen corresponding path program 1 times [2023-12-02 16:43:31,770 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:43:31,770 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546299303] [2023-12-02 16:43:31,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:31,770 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:43:31,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:31,972 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-12-02 16:43:31,972 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:43:31,972 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546299303] [2023-12-02 16:43:31,972 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [546299303] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:43:31,972 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [161585814] [2023-12-02 16:43:31,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:31,973 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:43:31,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:43:31,974 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:43:31,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 16:43:32,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:32,157 INFO L262 TraceCheckSpWp]: Trace formula consists of 769 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:43:32,160 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:43:32,180 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 75 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 16:43:32,180 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:43:32,180 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [161585814] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:43:32,180 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:43:32,181 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:43:32,181 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448977515] [2023-12-02 16:43:32,181 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:43:32,181 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:43:32,182 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:43:32,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:43:32,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:43:32,182 INFO L87 Difference]: Start difference. First operand 35271 states and 46871 transitions. Second operand has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:43:33,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:43:33,074 INFO L93 Difference]: Finished difference Result 48886 states and 65461 transitions. [2023-12-02 16:43:33,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:43:33,075 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 150 [2023-12-02 16:43:33,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:43:33,147 INFO L225 Difference]: With dead ends: 48886 [2023-12-02 16:43:33,147 INFO L226 Difference]: Without dead ends: 33671 [2023-12-02 16:43:33,174 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:43:33,175 INFO L413 NwaCegarLoop]: 170 mSDtfsCounter, 40 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:43:33,175 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 318 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:43:33,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33671 states. [2023-12-02 16:43:34,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33671 to 31559. [2023-12-02 16:43:34,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31559 states, 27133 states have (on average 1.357719382301994) internal successors, (36839), 27198 states have internal predecessors, (36839), 2776 states have call successors, (2776), 1649 states have call predecessors, (2776), 1649 states have return successors, (2776), 2712 states have call predecessors, (2776), 2776 states have call successors, (2776) [2023-12-02 16:43:34,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31559 states to 31559 states and 42391 transitions. [2023-12-02 16:43:34,385 INFO L78 Accepts]: Start accepts. Automaton has 31559 states and 42391 transitions. Word has length 150 [2023-12-02 16:43:34,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:43:34,385 INFO L495 AbstractCegarLoop]: Abstraction has 31559 states and 42391 transitions. [2023-12-02 16:43:34,386 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:43:34,386 INFO L276 IsEmpty]: Start isEmpty. Operand 31559 states and 42391 transitions. [2023-12-02 16:43:34,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2023-12-02 16:43:34,428 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:43:34,428 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 16:43:34,434 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 16:43:34,628 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:43:34,629 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:43:34,629 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:43:34,629 INFO L85 PathProgramCache]: Analyzing trace with hash -294409188, now seen corresponding path program 1 times [2023-12-02 16:43:34,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:43:34,629 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415415405] [2023-12-02 16:43:34,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:34,629 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:43:34,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:34,884 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-12-02 16:43:34,884 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:43:34,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415415405] [2023-12-02 16:43:34,884 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1415415405] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:43:34,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861905102] [2023-12-02 16:43:34,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:34,885 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:43:34,885 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:43:34,886 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:43:34,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 16:43:35,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:35,072 INFO L262 TraceCheckSpWp]: Trace formula consists of 773 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:43:35,076 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:43:35,111 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 76 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 16:43:35,111 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:43:35,112 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861905102] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:43:35,112 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:43:35,112 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:43:35,112 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156758191] [2023-12-02 16:43:35,112 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:43:35,113 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:43:35,113 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:43:35,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:43:35,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:43:35,114 INFO L87 Difference]: Start difference. First operand 31559 states and 42391 transitions. Second operand has 3 states, 3 states have (on average 36.0) internal successors, (108), 3 states have internal predecessors, (108), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:43:36,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:43:36,612 INFO L93 Difference]: Finished difference Result 76833 states and 104644 transitions. [2023-12-02 16:43:36,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:43:36,613 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.0) internal successors, (108), 3 states have internal predecessors, (108), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 151 [2023-12-02 16:43:36,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:43:36,719 INFO L225 Difference]: With dead ends: 76833 [2023-12-02 16:43:36,719 INFO L226 Difference]: Without dead ends: 45331 [2023-12-02 16:43:36,767 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:43:36,768 INFO L413 NwaCegarLoop]: 171 mSDtfsCounter, 79 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 312 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:43:36,768 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 312 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:43:36,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45331 states. [2023-12-02 16:43:38,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45331 to 36627. [2023-12-02 16:43:38,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36627 states, 31911 states have (on average 1.3801197079377017) internal successors, (44041), 31977 states have internal predecessors, (44041), 2921 states have call successors, (2921), 1794 states have call predecessors, (2921), 1794 states have return successors, (2921), 2856 states have call predecessors, (2921), 2921 states have call successors, (2921) [2023-12-02 16:43:38,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36627 states to 36627 states and 49883 transitions. [2023-12-02 16:43:38,686 INFO L78 Accepts]: Start accepts. Automaton has 36627 states and 49883 transitions. Word has length 151 [2023-12-02 16:43:38,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:43:38,687 INFO L495 AbstractCegarLoop]: Abstraction has 36627 states and 49883 transitions. [2023-12-02 16:43:38,687 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.0) internal successors, (108), 3 states have internal predecessors, (108), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:43:38,687 INFO L276 IsEmpty]: Start isEmpty. Operand 36627 states and 49883 transitions. [2023-12-02 16:43:38,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2023-12-02 16:43:38,737 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:43:38,738 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:43:38,744 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 16:43:38,938 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:43:38,938 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:43:38,939 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:43:38,939 INFO L85 PathProgramCache]: Analyzing trace with hash -311488787, now seen corresponding path program 1 times [2023-12-02 16:43:38,939 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:43:38,939 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1835652430] [2023-12-02 16:43:38,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:38,939 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:43:38,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:39,142 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 17 proven. 43 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-12-02 16:43:39,142 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:43:39,142 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1835652430] [2023-12-02 16:43:39,142 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1835652430] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:43:39,142 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [526231862] [2023-12-02 16:43:39,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:39,143 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:43:39,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:43:39,144 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:43:39,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 16:43:39,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:39,317 INFO L262 TraceCheckSpWp]: Trace formula consists of 779 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:43:39,320 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:43:39,424 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-12-02 16:43:39,424 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:43:39,424 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [526231862] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:43:39,424 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:43:39,424 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 10 [2023-12-02 16:43:39,425 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171820220] [2023-12-02 16:43:39,425 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:43:39,425 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:43:39,425 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:43:39,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:43:39,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2023-12-02 16:43:39,426 INFO L87 Difference]: Start difference. First operand 36627 states and 49883 transitions. Second operand has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 5 states have internal predecessors, (100), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:43:41,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:43:41,677 INFO L93 Difference]: Finished difference Result 90595 states and 123257 transitions. [2023-12-02 16:43:41,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 16:43:41,678 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 5 states have internal predecessors, (100), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 153 [2023-12-02 16:43:41,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:43:41,793 INFO L225 Difference]: With dead ends: 90595 [2023-12-02 16:43:41,794 INFO L226 Difference]: Without dead ends: 54025 [2023-12-02 16:43:41,832 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-12-02 16:43:41,833 INFO L413 NwaCegarLoop]: 144 mSDtfsCounter, 555 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 150 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 570 SdHoareTripleChecker+Valid, 346 SdHoareTripleChecker+Invalid, 290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 150 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:43:41,833 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [570 Valid, 346 Invalid, 290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [150 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:43:41,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54025 states. [2023-12-02 16:43:43,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54025 to 54023. [2023-12-02 16:43:43,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54023 states, 47011 states have (on average 1.3659143604688264) internal successors, (64213), 47109 states have internal predecessors, (64213), 4325 states have call successors, (4325), 2686 states have call predecessors, (4325), 2686 states have return successors, (4325), 4228 states have call predecessors, (4325), 4325 states have call successors, (4325) [2023-12-02 16:43:43,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54023 states to 54023 states and 72863 transitions. [2023-12-02 16:43:43,972 INFO L78 Accepts]: Start accepts. Automaton has 54023 states and 72863 transitions. Word has length 153 [2023-12-02 16:43:43,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:43:43,972 INFO L495 AbstractCegarLoop]: Abstraction has 54023 states and 72863 transitions. [2023-12-02 16:43:43,972 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 5 states have internal predecessors, (100), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:43:43,972 INFO L276 IsEmpty]: Start isEmpty. Operand 54023 states and 72863 transitions. [2023-12-02 16:43:44,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2023-12-02 16:43:44,044 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:43:44,044 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 16:43:44,050 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-12-02 16:43:44,244 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 16:43:44,245 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:43:44,245 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:43:44,245 INFO L85 PathProgramCache]: Analyzing trace with hash 1287524828, now seen corresponding path program 1 times [2023-12-02 16:43:44,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:43:44,245 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [594116589] [2023-12-02 16:43:44,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:44,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:43:44,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:44,338 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 23 proven. 4 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2023-12-02 16:43:44,339 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:43:44,339 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [594116589] [2023-12-02 16:43:44,339 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [594116589] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:43:44,339 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [194878660] [2023-12-02 16:43:44,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:44,340 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:43:44,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:43:44,341 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:43:44,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 16:43:44,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:44,497 INFO L262 TraceCheckSpWp]: Trace formula consists of 761 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:43:44,500 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:43:44,623 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 16:43:44,623 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:43:44,624 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [194878660] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:43:44,624 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:43:44,624 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 16:43:44,624 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [264384299] [2023-12-02 16:43:44,624 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:43:44,625 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:43:44,625 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:43:44,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:43:44,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:43:44,626 INFO L87 Difference]: Start difference. First operand 54023 states and 72863 transitions. Second operand has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:43:47,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:43:47,005 INFO L93 Difference]: Finished difference Result 104123 states and 141805 transitions. [2023-12-02 16:43:47,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:43:47,006 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 149 [2023-12-02 16:43:47,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:43:47,155 INFO L225 Difference]: With dead ends: 104123 [2023-12-02 16:43:47,155 INFO L226 Difference]: Without dead ends: 67973 [2023-12-02 16:43:47,214 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:43:47,214 INFO L413 NwaCegarLoop]: 253 mSDtfsCounter, 102 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 411 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:43:47,215 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 411 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:43:47,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67973 states. [2023-12-02 16:43:49,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67973 to 63287. [2023-12-02 16:43:49,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63287 states, 55699 states have (on average 1.3855365446417351) internal successors, (77173), 55797 states have internal predecessors, (77173), 4613 states have call successors, (4613), 2974 states have call predecessors, (4613), 2974 states have return successors, (4613), 4516 states have call predecessors, (4613), 4613 states have call successors, (4613) [2023-12-02 16:43:49,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63287 states to 63287 states and 86399 transitions. [2023-12-02 16:43:49,922 INFO L78 Accepts]: Start accepts. Automaton has 63287 states and 86399 transitions. Word has length 149 [2023-12-02 16:43:49,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:43:49,923 INFO L495 AbstractCegarLoop]: Abstraction has 63287 states and 86399 transitions. [2023-12-02 16:43:49,923 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:43:49,923 INFO L276 IsEmpty]: Start isEmpty. Operand 63287 states and 86399 transitions. [2023-12-02 16:43:50,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2023-12-02 16:43:50,006 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:43:50,007 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:43:50,012 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 16:43:50,207 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 16:43:50,207 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:43:50,208 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:43:50,208 INFO L85 PathProgramCache]: Analyzing trace with hash 1652821092, now seen corresponding path program 1 times [2023-12-02 16:43:50,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:43:50,208 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712134982] [2023-12-02 16:43:50,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:50,208 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:43:50,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:50,394 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 17 proven. 45 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-12-02 16:43:50,394 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:43:50,394 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1712134982] [2023-12-02 16:43:50,394 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1712134982] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:43:50,394 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [467456087] [2023-12-02 16:43:50,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:50,395 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:43:50,395 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:43:50,397 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:43:50,398 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 16:43:50,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:50,591 INFO L262 TraceCheckSpWp]: Trace formula consists of 773 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:43:50,594 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:43:50,638 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 97 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 16:43:50,638 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:43:50,638 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [467456087] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:43:50,638 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:43:50,639 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:43:50,639 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956330685] [2023-12-02 16:43:50,639 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:43:50,639 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:43:50,639 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:43:50,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:43:50,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:43:50,640 INFO L87 Difference]: Start difference. First operand 63287 states and 86399 transitions. Second operand has 3 states, 3 states have (on average 40.666666666666664) internal successors, (122), 3 states have internal predecessors, (122), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:43:53,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:43:53,330 INFO L93 Difference]: Finished difference Result 108799 states and 150545 transitions. [2023-12-02 16:43:53,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:43:53,331 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 40.666666666666664) internal successors, (122), 3 states have internal predecessors, (122), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 153 [2023-12-02 16:43:53,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:43:53,453 INFO L225 Difference]: With dead ends: 108799 [2023-12-02 16:43:53,454 INFO L226 Difference]: Without dead ends: 63385 [2023-12-02 16:43:53,505 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:43:53,506 INFO L413 NwaCegarLoop]: 269 mSDtfsCounter, 140 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 411 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:43:53,506 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [140 Valid, 411 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:43:53,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63385 states. [2023-12-02 16:43:56,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63385 to 62903. [2023-12-02 16:43:56,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62903 states, 55315 states have (on average 1.3720148241887373) internal successors, (75893), 55413 states have internal predecessors, (75893), 4613 states have call successors, (4613), 2974 states have call predecessors, (4613), 2974 states have return successors, (4613), 4516 states have call predecessors, (4613), 4613 states have call successors, (4613) [2023-12-02 16:43:56,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62903 states to 62903 states and 85119 transitions. [2023-12-02 16:43:56,496 INFO L78 Accepts]: Start accepts. Automaton has 62903 states and 85119 transitions. Word has length 153 [2023-12-02 16:43:56,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:43:56,496 INFO L495 AbstractCegarLoop]: Abstraction has 62903 states and 85119 transitions. [2023-12-02 16:43:56,496 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 40.666666666666664) internal successors, (122), 3 states have internal predecessors, (122), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:43:56,496 INFO L276 IsEmpty]: Start isEmpty. Operand 62903 states and 85119 transitions. [2023-12-02 16:43:56,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2023-12-02 16:43:56,578 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:43:56,578 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:43:56,584 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-12-02 16:43:56,779 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:43:56,779 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:43:56,780 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:43:56,780 INFO L85 PathProgramCache]: Analyzing trace with hash 284849698, now seen corresponding path program 1 times [2023-12-02 16:43:56,780 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:43:56,780 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [475421678] [2023-12-02 16:43:56,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:56,780 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:43:56,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:57,023 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 17 proven. 43 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-12-02 16:43:57,023 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:43:57,023 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [475421678] [2023-12-02 16:43:57,024 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [475421678] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:43:57,024 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [451820166] [2023-12-02 16:43:57,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:57,024 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:43:57,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:43:57,025 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:43:57,028 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 16:43:57,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:57,207 INFO L262 TraceCheckSpWp]: Trace formula consists of 779 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:43:57,210 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:43:57,314 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-12-02 16:43:57,314 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:43:57,314 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [451820166] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:43:57,314 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:43:57,314 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 10 [2023-12-02 16:43:57,315 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667100999] [2023-12-02 16:43:57,315 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:43:57,315 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:43:57,315 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:43:57,316 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:43:57,316 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2023-12-02 16:43:57,316 INFO L87 Difference]: Start difference. First operand 62903 states and 85119 transitions. Second operand has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 5 states have internal predecessors, (104), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:44:01,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:44:01,514 INFO L93 Difference]: Finished difference Result 155119 states and 209373 transitions. [2023-12-02 16:44:01,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 16:44:01,515 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 5 states have internal predecessors, (104), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 153 [2023-12-02 16:44:01,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:44:01,699 INFO L225 Difference]: With dead ends: 155119 [2023-12-02 16:44:01,699 INFO L226 Difference]: Without dead ends: 92273 [2023-12-02 16:44:01,757 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-12-02 16:44:01,757 INFO L413 NwaCegarLoop]: 141 mSDtfsCounter, 435 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 450 SdHoareTripleChecker+Valid, 416 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:44:01,757 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [450 Valid, 416 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:44:01,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92273 states. [2023-12-02 16:44:05,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92273 to 92271. [2023-12-02 16:44:05,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92271 states, 80979 states have (on average 1.3521159806863507) internal successors, (109493), 81125 states have internal predecessors, (109493), 6837 states have call successors, (6837), 4454 states have call predecessors, (6837), 4454 states have return successors, (6837), 6692 states have call predecessors, (6837), 6837 states have call successors, (6837) [2023-12-02 16:44:05,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92271 states to 92271 states and 123167 transitions. [2023-12-02 16:44:05,991 INFO L78 Accepts]: Start accepts. Automaton has 92271 states and 123167 transitions. Word has length 153 [2023-12-02 16:44:05,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:44:05,991 INFO L495 AbstractCegarLoop]: Abstraction has 92271 states and 123167 transitions. [2023-12-02 16:44:05,992 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 5 states have internal predecessors, (104), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:44:05,992 INFO L276 IsEmpty]: Start isEmpty. Operand 92271 states and 123167 transitions. [2023-12-02 16:44:06,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2023-12-02 16:44:06,111 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:44:06,112 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:44:06,117 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 16:44:06,312 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:44:06,312 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:44:06,313 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:44:06,313 INFO L85 PathProgramCache]: Analyzing trace with hash -2112740569, now seen corresponding path program 1 times [2023-12-02 16:44:06,313 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:44:06,313 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1667462170] [2023-12-02 16:44:06,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:44:06,313 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:44:06,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:44:06,576 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 22 proven. 7 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2023-12-02 16:44:06,576 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:44:06,576 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1667462170] [2023-12-02 16:44:06,576 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1667462170] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:44:06,576 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [574912514] [2023-12-02 16:44:06,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:44:06,576 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:44:06,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:44:06,578 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:44:06,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 16:44:06,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:44:06,752 INFO L262 TraceCheckSpWp]: Trace formula consists of 776 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:44:06,756 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:44:06,787 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 16:44:06,787 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:44:06,787 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [574912514] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:44:06,788 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:44:06,788 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 16:44:06,788 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797092845] [2023-12-02 16:44:06,788 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:44:06,789 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:44:06,789 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:44:06,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:44:06,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:44:06,790 INFO L87 Difference]: Start difference. First operand 92271 states and 123167 transitions. Second operand has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:44:11,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:44:11,822 INFO L93 Difference]: Finished difference Result 178547 states and 240009 transitions. [2023-12-02 16:44:11,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:44:11,823 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 153 [2023-12-02 16:44:11,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:44:12,087 INFO L225 Difference]: With dead ends: 178547 [2023-12-02 16:44:12,087 INFO L226 Difference]: Without dead ends: 117193 [2023-12-02 16:44:12,163 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:44:12,164 INFO L413 NwaCegarLoop]: 257 mSDtfsCounter, 105 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 414 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:44:12,164 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 414 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:44:12,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117193 states. [2023-12-02 16:44:17,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117193 to 109215. [2023-12-02 16:44:17,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109215 states, 96771 states have (on average 1.3665767636998687) internal successors, (132245), 96917 states have internal predecessors, (132245), 7413 states have call successors, (7413), 5030 states have call predecessors, (7413), 5030 states have return successors, (7413), 7268 states have call predecessors, (7413), 7413 states have call successors, (7413) [2023-12-02 16:44:18,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109215 states to 109215 states and 147071 transitions. [2023-12-02 16:44:18,059 INFO L78 Accepts]: Start accepts. Automaton has 109215 states and 147071 transitions. Word has length 153 [2023-12-02 16:44:18,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:44:18,060 INFO L495 AbstractCegarLoop]: Abstraction has 109215 states and 147071 transitions. [2023-12-02 16:44:18,060 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:44:18,060 INFO L276 IsEmpty]: Start isEmpty. Operand 109215 states and 147071 transitions. [2023-12-02 16:44:18,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2023-12-02 16:44:18,187 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:44:18,188 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:44:18,193 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 16:44:18,388 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-12-02 16:44:18,389 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:44:18,389 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:44:18,389 INFO L85 PathProgramCache]: Analyzing trace with hash -1618097848, now seen corresponding path program 1 times [2023-12-02 16:44:18,389 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:44:18,389 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886600553] [2023-12-02 16:44:18,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:44:18,390 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:44:18,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:44:18,573 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 17 proven. 43 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-12-02 16:44:18,573 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:44:18,573 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886600553] [2023-12-02 16:44:18,573 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1886600553] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:44:18,574 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [338458569] [2023-12-02 16:44:18,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:44:18,574 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:44:18,574 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:44:18,575 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:44:18,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 16:44:18,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:44:18,909 INFO L262 TraceCheckSpWp]: Trace formula consists of 791 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:44:18,915 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:44:19,007 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 16:44:19,007 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:44:19,007 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [338458569] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:44:19,008 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:44:19,008 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2023-12-02 16:44:19,008 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769064779] [2023-12-02 16:44:19,008 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:44:19,009 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:44:19,009 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:44:19,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:44:19,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:44:19,010 INFO L87 Difference]: Start difference. First operand 109215 states and 147071 transitions. Second operand has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 5 states have internal predecessors, (100), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:44:27,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:44:27,308 INFO L93 Difference]: Finished difference Result 268859 states and 360857 transitions. [2023-12-02 16:44:27,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 16:44:27,308 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 5 states have internal predecessors, (100), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 157 [2023-12-02 16:44:27,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:44:27,760 INFO L225 Difference]: With dead ends: 268859 [2023-12-02 16:44:27,760 INFO L226 Difference]: Without dead ends: 159701 [2023-12-02 16:44:27,853 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2023-12-02 16:44:27,854 INFO L413 NwaCegarLoop]: 143 mSDtfsCounter, 462 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 477 SdHoareTripleChecker+Valid, 423 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 16:44:27,854 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [477 Valid, 423 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 178 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 16:44:27,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159701 states. [2023-12-02 16:44:36,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159701 to 159699. [2023-12-02 16:44:36,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159699 states, 141167 states have (on average 1.3427571599594805) internal successors, (189553), 141385 states have internal predecessors, (189553), 10997 states have call successors, (10997), 7534 states have call predecessors, (10997), 7534 states have return successors, (10997), 10780 states have call predecessors, (10997), 10997 states have call successors, (10997) [2023-12-02 16:44:37,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159699 states to 159699 states and 211547 transitions. [2023-12-02 16:44:37,236 INFO L78 Accepts]: Start accepts. Automaton has 159699 states and 211547 transitions. Word has length 157 [2023-12-02 16:44:37,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:44:37,236 INFO L495 AbstractCegarLoop]: Abstraction has 159699 states and 211547 transitions. [2023-12-02 16:44:37,236 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 5 states have internal predecessors, (100), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:44:37,237 INFO L276 IsEmpty]: Start isEmpty. Operand 159699 states and 211547 transitions. [2023-12-02 16:44:37,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2023-12-02 16:44:37,454 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:44:37,455 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:44:37,461 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 16:44:37,655 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:44:37,655 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:44:37,656 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:44:37,656 INFO L85 PathProgramCache]: Analyzing trace with hash -2112334402, now seen corresponding path program 1 times [2023-12-02 16:44:37,656 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:44:37,656 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1818799373] [2023-12-02 16:44:37,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:44:37,656 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:44:37,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:44:37,854 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 20 proven. 43 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-12-02 16:44:37,854 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:44:37,854 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1818799373] [2023-12-02 16:44:37,854 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1818799373] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:44:37,854 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [407802153] [2023-12-02 16:44:37,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:44:37,855 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:44:37,855 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:44:37,856 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:44:37,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 16:44:38,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:44:38,018 INFO L262 TraceCheckSpWp]: Trace formula consists of 803 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:44:38,022 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:44:38,105 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 76 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-12-02 16:44:38,105 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:44:38,105 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [407802153] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:44:38,105 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:44:38,106 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 10 [2023-12-02 16:44:38,106 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759037208] [2023-12-02 16:44:38,106 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:44:38,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:44:38,107 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:44:38,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:44:38,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2023-12-02 16:44:38,108 INFO L87 Difference]: Start difference. First operand 159699 states and 211547 transitions. Second operand has 6 states, 5 states have (on average 22.6) internal successors, (113), 5 states have internal predecessors, (113), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:44:50,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:44:50,294 INFO L93 Difference]: Finished difference Result 378335 states and 500705 transitions. [2023-12-02 16:44:50,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 16:44:50,295 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 22.6) internal successors, (113), 5 states have internal predecessors, (113), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 161 [2023-12-02 16:44:50,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:44:50,819 INFO L225 Difference]: With dead ends: 378335 [2023-12-02 16:44:50,820 INFO L226 Difference]: Without dead ends: 218693 [2023-12-02 16:44:50,975 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-12-02 16:44:50,975 INFO L413 NwaCegarLoop]: 143 mSDtfsCounter, 428 mSDsluCounter, 270 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 443 SdHoareTripleChecker+Valid, 413 SdHoareTripleChecker+Invalid, 283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:44:50,976 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [443 Valid, 413 Invalid, 283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 16:44:51,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218693 states. [2023-12-02 16:45:03,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218693 to 218691. [2023-12-02 16:45:03,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218691 states, 192249 states have (on average 1.3287403315491888) internal successors, (255449), 192575 states have internal predecessors, (255449), 15735 states have call successors, (15735), 10706 states have call predecessors, (15735), 10706 states have return successors, (15735), 15410 states have call predecessors, (15735), 15735 states have call successors, (15735) [2023-12-02 16:45:04,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218691 states to 218691 states and 286919 transitions. [2023-12-02 16:45:04,822 INFO L78 Accepts]: Start accepts. Automaton has 218691 states and 286919 transitions. Word has length 161 [2023-12-02 16:45:04,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:45:04,823 INFO L495 AbstractCegarLoop]: Abstraction has 218691 states and 286919 transitions. [2023-12-02 16:45:04,823 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 22.6) internal successors, (113), 5 states have internal predecessors, (113), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:45:04,823 INFO L276 IsEmpty]: Start isEmpty. Operand 218691 states and 286919 transitions. [2023-12-02 16:45:05,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2023-12-02 16:45:05,101 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:45:05,102 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:45:05,107 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 16:45:05,302 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:45:05,302 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:45:05,303 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:45:05,303 INFO L85 PathProgramCache]: Analyzing trace with hash -1856218077, now seen corresponding path program 1 times [2023-12-02 16:45:05,303 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:45:05,303 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109091084] [2023-12-02 16:45:05,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:45:05,303 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:45:05,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:45:05,490 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 20 proven. 43 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-12-02 16:45:05,490 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:45:05,491 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109091084] [2023-12-02 16:45:05,491 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [109091084] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:45:05,491 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1002577987] [2023-12-02 16:45:05,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:45:05,491 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:45:05,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:45:05,492 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:45:05,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 16:45:05,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:45:05,651 INFO L262 TraceCheckSpWp]: Trace formula consists of 815 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:45:05,655 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:45:05,723 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-12-02 16:45:05,723 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:45:05,723 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1002577987] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:45:05,723 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:45:05,723 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2023-12-02 16:45:05,723 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619448358] [2023-12-02 16:45:05,723 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:45:05,724 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:45:05,724 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:45:05,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:45:05,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:45:05,725 INFO L87 Difference]: Start difference. First operand 218691 states and 286919 transitions. Second operand has 6 states, 6 states have (on average 17.833333333333332) internal successors, (107), 5 states have internal predecessors, (107), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:45:25,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:45:25,282 INFO L93 Difference]: Finished difference Result 538400 states and 703763 transitions. [2023-12-02 16:45:25,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 16:45:25,283 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.833333333333332) internal successors, (107), 5 states have internal predecessors, (107), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 165 [2023-12-02 16:45:25,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:45:26,042 INFO L225 Difference]: With dead ends: 538400 [2023-12-02 16:45:26,043 INFO L226 Difference]: Without dead ends: 319766 [2023-12-02 16:45:26,259 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2023-12-02 16:45:26,260 INFO L413 NwaCegarLoop]: 142 mSDtfsCounter, 444 mSDsluCounter, 284 mSDsCounter, 0 mSdLazyCounter, 183 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 459 SdHoareTripleChecker+Valid, 426 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:45:26,260 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [459 Valid, 426 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 183 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:45:26,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319766 states. [2023-12-02 16:45:45,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319766 to 319764. [2023-12-02 16:45:46,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319764 states, 280418 states have (on average 1.3039783466111305) internal successors, (365659), 280906 states have internal predecessors, (365659), 23321 states have call successors, (23321), 16024 states have call predecessors, (23321), 16024 states have return successors, (23321), 22834 states have call predecessors, (23321), 23321 states have call successors, (23321) [2023-12-02 16:45:47,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319764 states to 319764 states and 412301 transitions. [2023-12-02 16:45:47,458 INFO L78 Accepts]: Start accepts. Automaton has 319764 states and 412301 transitions. Word has length 165 [2023-12-02 16:45:47,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:45:47,459 INFO L495 AbstractCegarLoop]: Abstraction has 319764 states and 412301 transitions. [2023-12-02 16:45:47,459 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 17.833333333333332) internal successors, (107), 5 states have internal predecessors, (107), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:45:47,459 INFO L276 IsEmpty]: Start isEmpty. Operand 319764 states and 412301 transitions. [2023-12-02 16:45:47,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2023-12-02 16:45:47,851 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:45:47,852 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:45:47,857 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2023-12-02 16:45:48,052 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2023-12-02 16:45:48,052 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:45:48,053 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:45:48,053 INFO L85 PathProgramCache]: Analyzing trace with hash -1167038995, now seen corresponding path program 1 times [2023-12-02 16:45:48,053 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:45:48,053 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250120823] [2023-12-02 16:45:48,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:45:48,053 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:45:48,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:45:48,640 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 50 proven. 23 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-12-02 16:45:48,640 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:45:48,640 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250120823] [2023-12-02 16:45:48,640 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1250120823] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:45:48,640 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1583374464] [2023-12-02 16:45:48,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:45:48,640 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:45:48,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:45:48,642 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:45:48,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 16:45:48,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:45:48,806 INFO L262 TraceCheckSpWp]: Trace formula consists of 827 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 16:45:48,810 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:45:48,878 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 102 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 16:45:48,878 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:45:48,879 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1583374464] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:45:48,879 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:45:48,879 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2023-12-02 16:45:48,879 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517681316] [2023-12-02 16:45:48,879 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:45:48,880 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:45:48,880 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:45:48,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:45:48,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:45:48,880 INFO L87 Difference]: Start difference. First operand 319764 states and 412301 transitions. Second operand has 3 states, 3 states have (on average 46.666666666666664) internal successors, (140), 3 states have internal predecessors, (140), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:46:10,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:46:10,226 INFO L93 Difference]: Finished difference Result 588956 states and 763740 transitions. [2023-12-02 16:46:10,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:46:10,227 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 46.666666666666664) internal successors, (140), 3 states have internal predecessors, (140), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 169 [2023-12-02 16:46:10,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:46:11,101 INFO L225 Difference]: With dead ends: 588956 [2023-12-02 16:46:11,101 INFO L226 Difference]: Without dead ends: 362508 [2023-12-02 16:46:11,354 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 171 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:46:11,355 INFO L413 NwaCegarLoop]: 171 mSDtfsCounter, 112 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:46:11,355 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 217 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:46:11,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362508 states. [2023-12-02 16:46:33,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362508 to 360176. [2023-12-02 16:46:33,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360176 states, 318527 states have (on average 1.2892250892389028) internal successors, (410653), 319015 states have internal predecessors, (410653), 23743 states have call successors, (23743), 17905 states have call predecessors, (23743), 17905 states have return successors, (25331), 23256 states have call predecessors, (25331), 23743 states have call successors, (25331) [2023-12-02 16:46:34,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360176 states to 360176 states and 459727 transitions. [2023-12-02 16:46:34,774 INFO L78 Accepts]: Start accepts. Automaton has 360176 states and 459727 transitions. Word has length 169 [2023-12-02 16:46:34,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:46:34,774 INFO L495 AbstractCegarLoop]: Abstraction has 360176 states and 459727 transitions. [2023-12-02 16:46:34,775 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 46.666666666666664) internal successors, (140), 3 states have internal predecessors, (140), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:46:34,775 INFO L276 IsEmpty]: Start isEmpty. Operand 360176 states and 459727 transitions. [2023-12-02 16:46:35,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2023-12-02 16:46:35,192 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:46:35,192 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 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] [2023-12-02 16:46:35,198 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 16:46:35,393 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-12-02 16:46:35,393 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:46:35,393 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:46:35,394 INFO L85 PathProgramCache]: Analyzing trace with hash 1175150025, now seen corresponding path program 1 times [2023-12-02 16:46:35,394 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:46:35,394 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135519416] [2023-12-02 16:46:35,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:46:35,394 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:46:35,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:46:35,595 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 63 proven. 26 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-12-02 16:46:35,595 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:46:35,595 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135519416] [2023-12-02 16:46:35,595 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135519416] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:46:35,595 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [333098146] [2023-12-02 16:46:35,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:46:35,596 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:46:35,596 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:46:35,597 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:46:35,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e27787dc-975e-487b-a486-805e06670d4f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 16:46:35,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:46:35,760 INFO L262 TraceCheckSpWp]: Trace formula consists of 825 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 16:46:35,764 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:46:35,834 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 117 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:46:35,834 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:46:35,834 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [333098146] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:46:35,834 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:46:35,834 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 6 [2023-12-02 16:46:35,834 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632392410] [2023-12-02 16:46:35,834 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:46:35,835 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:46:35,835 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:46:35,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:46:35,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:46:35,836 INFO L87 Difference]: Start difference. First operand 360176 states and 459727 transitions. Second operand has 6 states, 6 states have (on average 24.833333333333332) internal successors, (149), 6 states have internal predecessors, (149), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11)