./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.12.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.12.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91 --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 e7f05adfe3188223e40d6d03e9bb9b8e606803720f2852bb7411adc46181c52f --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-24 23:50:55,994 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-24 23:50:56,076 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-24 23:50:56,083 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-24 23:50:56,083 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-24 23:50:56,112 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-24 23:50:56,112 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-24 23:50:56,113 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-24 23:50:56,114 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-24 23:50:56,114 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-24 23:50:56,115 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-24 23:50:56,115 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-24 23:50:56,116 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-24 23:50:56,117 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-24 23:50:56,117 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-24 23:50:56,118 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-24 23:50:56,118 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-24 23:50:56,119 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-24 23:50:56,119 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-24 23:50:56,120 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-24 23:50:56,120 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-24 23:50:56,121 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-24 23:50:56,122 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-24 23:50:56,122 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-24 23:50:56,123 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-24 23:50:56,123 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-24 23:50:56,124 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-24 23:50:56,124 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-24 23:50:56,124 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-24 23:50:56,125 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-24 23:50:56,125 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-24 23:50:56,126 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-24 23:50:56,126 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-24 23:50:56,127 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-24 23:50:56,127 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-24 23:50:56,127 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-24 23:50:56,128 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-24 23:50:56,128 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:50:56,129 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-24 23:50:56,129 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-24 23:50:56,130 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-24 23:50:56,130 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-24 23:50:56,131 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-24 23:50:56,131 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-24 23:50:56,132 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-24 23:50:56,132 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-24 23:50:56,132 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-24 23:50:56,133 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_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e7f05adfe3188223e40d6d03e9bb9b8e606803720f2852bb7411adc46181c52f [2023-11-24 23:50:56,410 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-24 23:50:56,435 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-24 23:50:56,438 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-24 23:50:56,439 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-24 23:50:56,440 INFO L274 PluginConnector]: CDTParser initialized [2023-11-24 23:50:56,442 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.12.cil-1.c [2023-11-24 23:50:59,773 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-24 23:51:00,631 INFO L384 CDTParser]: Found 1 translation units. [2023-11-24 23:51:00,632 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/sv-benchmarks/c/combinations/Problem05_label42+token_ring.12.cil-1.c [2023-11-24 23:51:00,691 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/data/489626899/64cecc27f9624c28b335d60312897ea9/FLAG724152a35 [2023-11-24 23:51:00,708 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/data/489626899/64cecc27f9624c28b335d60312897ea9 [2023-11-24 23:51:00,716 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-24 23:51:00,719 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-24 23:51:00,722 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-24 23:51:00,723 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-24 23:51:00,728 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-24 23:51:00,729 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:51:00" (1/1) ... [2023-11-24 23:51:00,730 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e1b340a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:51:00, skipping insertion in model container [2023-11-24 23:51:00,730 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:51:00" (1/1) ... [2023-11-24 23:51:01,050 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-24 23:51:03,667 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_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/sv-benchmarks/c/combinations/Problem05_label42+token_ring.12.cil-1.c[378560,378573] [2023-11-24 23:51:03,703 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_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/sv-benchmarks/c/combinations/Problem05_label42+token_ring.12.cil-1.c[383339,383352] [2023-11-24 23:51:04,090 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:51:04,102 INFO L202 MainTranslator]: Completed pre-run [2023-11-24 23:51:05,345 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_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/sv-benchmarks/c/combinations/Problem05_label42+token_ring.12.cil-1.c[378560,378573] [2023-11-24 23:51:05,354 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_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/sv-benchmarks/c/combinations/Problem05_label42+token_ring.12.cil-1.c[383339,383352] [2023-11-24 23:51:05,383 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:51:05,477 INFO L206 MainTranslator]: Completed translation [2023-11-24 23:51:05,478 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:51:05 WrapperNode [2023-11-24 23:51:05,478 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-24 23:51:05,480 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-24 23:51:05,480 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-24 23:51:05,480 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-24 23:51:05,489 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:51:05" (1/1) ... [2023-11-24 23:51:05,590 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:51:05" (1/1) ... [2023-11-24 23:51:06,135 INFO L138 Inliner]: procedures = 68, calls = 78, calls flagged for inlining = 45, calls inlined = 45, statements flattened = 13234 [2023-11-24 23:51:06,136 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-24 23:51:06,137 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-24 23:51:06,137 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-24 23:51:06,137 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-24 23:51:06,148 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:51:05" (1/1) ... [2023-11-24 23:51:06,148 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:51:05" (1/1) ... [2023-11-24 23:51:06,226 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:51:05" (1/1) ... [2023-11-24 23:51:06,226 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:51:05" (1/1) ... [2023-11-24 23:51:06,506 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:51:05" (1/1) ... [2023-11-24 23:51:06,619 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:51:05" (1/1) ... [2023-11-24 23:51:06,642 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:51:05" (1/1) ... [2023-11-24 23:51:06,662 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:51:05" (1/1) ... [2023-11-24 23:51:06,716 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-24 23:51:06,717 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-24 23:51:06,718 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-24 23:51:06,718 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-24 23:51:06,719 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:51:05" (1/1) ... [2023-11-24 23:51:06,725 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:51:06,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:51:06,750 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-24 23:51:06,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-24 23:51:06,794 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-24 23:51:06,796 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-11-24 23:51:06,796 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-11-24 23:51:06,797 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-11-24 23:51:06,797 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-11-24 23:51:06,797 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-11-24 23:51:06,797 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-11-24 23:51:06,797 INFO L130 BoogieDeclarations]: Found specification of procedure error [2023-11-24 23:51:06,797 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2023-11-24 23:51:06,797 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-11-24 23:51:06,798 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-11-24 23:51:06,798 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-11-24 23:51:06,798 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-11-24 23:51:06,798 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-11-24 23:51:06,799 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-11-24 23:51:06,799 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-24 23:51:06,799 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-24 23:51:06,799 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-24 23:51:07,013 INFO L241 CfgBuilder]: Building ICFG [2023-11-24 23:51:07,016 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-24 23:51:17,087 INFO L282 CfgBuilder]: Performing block encoding [2023-11-24 23:51:19,981 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-24 23:51:19,981 INFO L309 CfgBuilder]: Removed 16 assume(true) statements. [2023-11-24 23:51:19,984 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:51:19 BoogieIcfgContainer [2023-11-24 23:51:19,984 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-24 23:51:19,987 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-24 23:51:19,987 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-24 23:51:19,990 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-24 23:51:19,991 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 11:51:00" (1/3) ... [2023-11-24 23:51:19,992 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11c8d733 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:51:19, skipping insertion in model container [2023-11-24 23:51:19,992 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:51:05" (2/3) ... [2023-11-24 23:51:19,992 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11c8d733 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:51:19, skipping insertion in model container [2023-11-24 23:51:19,992 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:51:19" (3/3) ... [2023-11-24 23:51:19,994 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem05_label42+token_ring.12.cil-1.c [2023-11-24 23:51:20,014 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-24 23:51:20,014 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-11-24 23:51:20,108 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-24 23:51:20,115 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;@31654cbe, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-24 23:51:20,115 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-11-24 23:51:20,130 INFO L276 IsEmpty]: Start isEmpty. Operand has 1850 states, 1812 states have (on average 1.9492273730684326) internal successors, (3532), 1817 states have internal predecessors, (3532), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2023-11-24 23:51:20,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2023-11-24 23:51:20,147 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:51:20,148 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:51:20,149 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:51:20,153 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:51:20,153 INFO L85 PathProgramCache]: Analyzing trace with hash -830255909, now seen corresponding path program 1 times [2023-11-24 23:51:20,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:51:20,161 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688737705] [2023-11-24 23:51:20,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:51:20,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:51:20,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:51:20,727 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:51:20,727 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:51:20,728 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688737705] [2023-11-24 23:51:20,728 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [688737705] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:51:20,729 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:51:20,729 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-24 23:51:20,731 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666621721] [2023-11-24 23:51:20,731 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:51:20,735 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-24 23:51:20,736 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:51:20,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-24 23:51:20,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-24 23:51:20,786 INFO L87 Difference]: Start difference. First operand has 1850 states, 1812 states have (on average 1.9492273730684326) internal successors, (3532), 1817 states have internal predecessors, (3532), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-24 23:51:22,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:51:22,039 INFO L93 Difference]: Finished difference Result 3883 states and 7486 transitions. [2023-11-24 23:51:22,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-24 23:51:22,042 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 68 [2023-11-24 23:51:22,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:51:22,075 INFO L225 Difference]: With dead ends: 3883 [2023-11-24 23:51:22,075 INFO L226 Difference]: Without dead ends: 2032 [2023-11-24 23:51:22,087 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-24 23:51:22,091 INFO L413 NwaCegarLoop]: 3544 mSDtfsCounter, 3813 mSDsluCounter, 3444 mSDsCounter, 0 mSdLazyCounter, 730 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3813 SdHoareTripleChecker+Valid, 6988 SdHoareTripleChecker+Invalid, 744 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 730 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:51:22,093 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3813 Valid, 6988 Invalid, 744 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [14 Valid, 730 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-24 23:51:22,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2032 states. [2023-11-24 23:51:22,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2032 to 2031. [2023-11-24 23:51:22,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2031 states, 1967 states have (on average 1.907473309608541) internal successors, (3752), 1971 states have internal predecessors, (3752), 50 states have call successors, (50), 13 states have call predecessors, (50), 12 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2023-11-24 23:51:22,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2031 states to 2031 states and 3850 transitions. [2023-11-24 23:51:22,255 INFO L78 Accepts]: Start accepts. Automaton has 2031 states and 3850 transitions. Word has length 68 [2023-11-24 23:51:22,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:51:22,256 INFO L495 AbstractCegarLoop]: Abstraction has 2031 states and 3850 transitions. [2023-11-24 23:51:22,256 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-24 23:51:22,256 INFO L276 IsEmpty]: Start isEmpty. Operand 2031 states and 3850 transitions. [2023-11-24 23:51:22,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-11-24 23:51:22,266 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:51:22,267 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:51:22,267 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-24 23:51:22,268 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:51:22,268 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:51:22,268 INFO L85 PathProgramCache]: Analyzing trace with hash 362770690, now seen corresponding path program 1 times [2023-11-24 23:51:22,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:51:22,269 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1459600102] [2023-11-24 23:51:22,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:51:22,269 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:51:22,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:51:22,664 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-24 23:51:22,665 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:51:22,665 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1459600102] [2023-11-24 23:51:22,665 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1459600102] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:51:22,665 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1836681905] [2023-11-24 23:51:22,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:51:22,666 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:51:22,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:51:22,680 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:51:22,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-24 23:51:23,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:51:23,049 INFO L262 TraceCheckSpWp]: Trace formula consists of 1048 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-24 23:51:23,061 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:51:23,187 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-24 23:51:23,187 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:51:23,188 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1836681905] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:51:23,188 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:51:23,188 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-24 23:51:23,189 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122402246] [2023-11-24 23:51:23,189 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:51:23,190 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:51:23,190 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:51:23,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:51:23,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:51:23,192 INFO L87 Difference]: Start difference. First operand 2031 states and 3850 transitions. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 2 states have internal predecessors, (104), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-24 23:51:23,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:51:23,811 INFO L93 Difference]: Finished difference Result 2794 states and 5017 transitions. [2023-11-24 23:51:23,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:51:23,812 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 2 states have internal predecessors, (104), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 138 [2023-11-24 23:51:23,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:51:23,831 INFO L225 Difference]: With dead ends: 2794 [2023-11-24 23:51:23,832 INFO L226 Difference]: Without dead ends: 2409 [2023-11-24 23:51:23,835 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:51:23,836 INFO L413 NwaCegarLoop]: 3369 mSDtfsCounter, 3528 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3528 SdHoareTripleChecker+Valid, 3614 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-24 23:51:23,837 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3528 Valid, 3614 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-24 23:51:23,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2409 states. [2023-11-24 23:51:23,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2409 to 2403. [2023-11-24 23:51:23,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2403 states, 2285 states have (on average 1.8472647702407001) internal successors, (4221), 2290 states have internal predecessors, (4221), 92 states have call successors, (92), 25 states have call predecessors, (92), 24 states have return successors, (90), 88 states have call predecessors, (90), 90 states have call successors, (90) [2023-11-24 23:51:23,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2403 states to 2403 states and 4403 transitions. [2023-11-24 23:51:23,954 INFO L78 Accepts]: Start accepts. Automaton has 2403 states and 4403 transitions. Word has length 138 [2023-11-24 23:51:23,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:51:23,956 INFO L495 AbstractCegarLoop]: Abstraction has 2403 states and 4403 transitions. [2023-11-24 23:51:23,957 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 2 states have internal predecessors, (104), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-24 23:51:23,957 INFO L276 IsEmpty]: Start isEmpty. Operand 2403 states and 4403 transitions. [2023-11-24 23:51:23,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-11-24 23:51:23,969 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:51:23,970 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:51:23,985 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-24 23:51:24,177 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:51:24,178 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:51:24,178 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:51:24,179 INFO L85 PathProgramCache]: Analyzing trace with hash 1258244130, now seen corresponding path program 1 times [2023-11-24 23:51:24,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:51:24,179 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2105205248] [2023-11-24 23:51:24,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:51:24,180 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:51:24,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:51:24,621 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-24 23:51:24,621 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:51:24,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2105205248] [2023-11-24 23:51:24,632 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2105205248] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:51:24,632 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [404647893] [2023-11-24 23:51:24,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:51:24,633 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:51:24,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:51:24,634 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:51:24,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-24 23:51:24,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:51:24,912 INFO L262 TraceCheckSpWp]: Trace formula consists of 1042 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-24 23:51:24,919 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:51:24,960 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-11-24 23:51:24,960 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:51:24,960 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [404647893] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:51:24,960 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:51:24,961 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-24 23:51:24,961 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340914245] [2023-11-24 23:51:24,961 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:51:24,962 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:51:24,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:51:24,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:51:24,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:51:24,963 INFO L87 Difference]: Start difference. First operand 2403 states and 4403 transitions. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-24 23:51:25,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:51:25,636 INFO L93 Difference]: Finished difference Result 3904 states and 6694 transitions. [2023-11-24 23:51:25,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:51:25,637 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 138 [2023-11-24 23:51:25,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:51:25,662 INFO L225 Difference]: With dead ends: 3904 [2023-11-24 23:51:25,663 INFO L226 Difference]: Without dead ends: 3147 [2023-11-24 23:51:25,669 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:51:25,673 INFO L413 NwaCegarLoop]: 3349 mSDtfsCounter, 3546 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3546 SdHoareTripleChecker+Valid, 3594 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-24 23:51:25,674 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3546 Valid, 3594 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-24 23:51:25,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3147 states. [2023-11-24 23:51:25,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3147 to 3139. [2023-11-24 23:51:25,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3139 states, 2915 states have (on average 1.7656946826758146) internal successors, (5147), 2922 states have internal predecessors, (5147), 174 states have call successors, (174), 49 states have call predecessors, (174), 48 states have return successors, (172), 168 states have call predecessors, (172), 172 states have call successors, (172) [2023-11-24 23:51:25,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3139 states to 3139 states and 5493 transitions. [2023-11-24 23:51:25,827 INFO L78 Accepts]: Start accepts. Automaton has 3139 states and 5493 transitions. Word has length 138 [2023-11-24 23:51:25,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:51:25,827 INFO L495 AbstractCegarLoop]: Abstraction has 3139 states and 5493 transitions. [2023-11-24 23:51:25,828 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-24 23:51:25,828 INFO L276 IsEmpty]: Start isEmpty. Operand 3139 states and 5493 transitions. [2023-11-24 23:51:25,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-11-24 23:51:25,835 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:51:25,836 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:51:25,847 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-24 23:51:26,042 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:51:26,042 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:51:26,043 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:51:26,043 INFO L85 PathProgramCache]: Analyzing trace with hash 1409521474, now seen corresponding path program 1 times [2023-11-24 23:51:26,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:51:26,043 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1053957539] [2023-11-24 23:51:26,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:51:26,043 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:51:26,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:51:26,258 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-24 23:51:26,258 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:51:26,259 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1053957539] [2023-11-24 23:51:26,261 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1053957539] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:51:26,264 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1515356543] [2023-11-24 23:51:26,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:51:26,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:51:26,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:51:26,266 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:51:26,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-24 23:51:26,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:51:26,542 INFO L262 TraceCheckSpWp]: Trace formula consists of 1036 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-24 23:51:26,547 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:51:26,597 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-11-24 23:51:26,598 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:51:26,598 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1515356543] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:51:26,598 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:51:26,598 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-24 23:51:26,598 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985684225] [2023-11-24 23:51:26,599 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:51:26,599 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:51:26,599 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:51:26,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:51:26,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:51:26,600 INFO L87 Difference]: Start difference. First operand 3139 states and 5493 transitions. Second operand has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 2 states have internal predecessors, (92), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-24 23:51:27,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:51:27,272 INFO L93 Difference]: Finished difference Result 6100 states and 9998 transitions. [2023-11-24 23:51:27,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:51:27,273 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 2 states have internal predecessors, (92), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 138 [2023-11-24 23:51:27,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:51:27,307 INFO L225 Difference]: With dead ends: 6100 [2023-11-24 23:51:27,307 INFO L226 Difference]: Without dead ends: 4607 [2023-11-24 23:51:27,315 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:51:27,317 INFO L413 NwaCegarLoop]: 3327 mSDtfsCounter, 3540 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 318 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3540 SdHoareTripleChecker+Valid, 3572 SdHoareTripleChecker+Invalid, 320 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 318 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-24 23:51:27,318 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3540 Valid, 3572 Invalid, 320 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 318 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-24 23:51:27,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4607 states. [2023-11-24 23:51:27,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4607 to 4595. [2023-11-24 23:51:27,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4595 states, 4163 states have (on average 1.675474417487389) internal successors, (6975), 4174 states have internal predecessors, (6975), 334 states have call successors, (334), 97 states have call predecessors, (334), 96 states have return successors, (332), 324 states have call predecessors, (332), 332 states have call successors, (332) [2023-11-24 23:51:27,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4595 states to 4595 states and 7641 transitions. [2023-11-24 23:51:27,550 INFO L78 Accepts]: Start accepts. Automaton has 4595 states and 7641 transitions. Word has length 138 [2023-11-24 23:51:27,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:51:27,551 INFO L495 AbstractCegarLoop]: Abstraction has 4595 states and 7641 transitions. [2023-11-24 23:51:27,551 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 2 states have internal predecessors, (92), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-24 23:51:27,552 INFO L276 IsEmpty]: Start isEmpty. Operand 4595 states and 7641 transitions. [2023-11-24 23:51:27,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-11-24 23:51:27,562 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:51:27,563 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:51:27,571 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-24 23:51:27,770 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:51:27,771 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:51:27,771 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:51:27,771 INFO L85 PathProgramCache]: Analyzing trace with hash 1304018530, now seen corresponding path program 1 times [2023-11-24 23:51:27,771 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:51:27,771 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [231292373] [2023-11-24 23:51:27,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:51:27,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:51:27,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:51:28,004 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-24 23:51:28,004 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:51:28,005 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [231292373] [2023-11-24 23:51:28,005 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [231292373] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:51:28,005 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [54787577] [2023-11-24 23:51:28,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:51:28,007 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:51:28,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:51:28,010 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:51:28,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-24 23:51:28,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:51:28,291 INFO L262 TraceCheckSpWp]: Trace formula consists of 1030 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-24 23:51:28,295 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:51:28,329 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-11-24 23:51:28,330 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:51:28,330 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [54787577] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:51:28,330 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:51:28,330 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-24 23:51:28,331 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556656344] [2023-11-24 23:51:28,331 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:51:28,331 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:51:28,332 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:51:28,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:51:28,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:51:28,333 INFO L87 Difference]: Start difference. First operand 4595 states and 7641 transitions. Second operand has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-24 23:51:29,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:51:29,153 INFO L93 Difference]: Finished difference Result 10444 states and 16506 transitions. [2023-11-24 23:51:29,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:51:29,154 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 138 [2023-11-24 23:51:29,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:51:29,202 INFO L225 Difference]: With dead ends: 10444 [2023-11-24 23:51:29,203 INFO L226 Difference]: Without dead ends: 7495 [2023-11-24 23:51:29,216 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:51:29,216 INFO L413 NwaCegarLoop]: 3363 mSDtfsCounter, 3549 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3549 SdHoareTripleChecker+Valid, 3608 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-24 23:51:29,217 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3549 Valid, 3608 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-24 23:51:29,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7495 states. [2023-11-24 23:51:29,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7495 to 7475. [2023-11-24 23:51:29,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7475 states, 6635 states have (on average 1.5950263752825924) internal successors, (10583), 6654 states have internal predecessors, (10583), 646 states have call successors, (646), 193 states have call predecessors, (646), 192 states have return successors, (644), 628 states have call predecessors, (644), 644 states have call successors, (644) [2023-11-24 23:51:29,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7475 states to 7475 states and 11873 transitions. [2023-11-24 23:51:29,543 INFO L78 Accepts]: Start accepts. Automaton has 7475 states and 11873 transitions. Word has length 138 [2023-11-24 23:51:29,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:51:29,543 INFO L495 AbstractCegarLoop]: Abstraction has 7475 states and 11873 transitions. [2023-11-24 23:51:29,543 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-24 23:51:29,544 INFO L276 IsEmpty]: Start isEmpty. Operand 7475 states and 11873 transitions. [2023-11-24 23:51:29,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-11-24 23:51:29,559 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:51:29,559 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:51:29,571 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-24 23:51:29,771 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:51:29,771 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:51:29,772 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:51:29,772 INFO L85 PathProgramCache]: Analyzing trace with hash -1708287166, now seen corresponding path program 1 times [2023-11-24 23:51:29,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:51:29,773 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [560202181] [2023-11-24 23:51:29,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:51:29,773 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:51:29,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:51:29,963 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-24 23:51:29,964 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:51:29,964 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [560202181] [2023-11-24 23:51:29,964 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [560202181] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:51:29,964 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1682986496] [2023-11-24 23:51:29,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:51:29,965 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:51:29,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:51:29,966 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:51:30,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-24 23:51:30,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:51:30,248 INFO L262 TraceCheckSpWp]: Trace formula consists of 1024 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-24 23:51:30,252 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:51:30,331 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-24 23:51:30,331 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:51:30,331 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1682986496] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:51:30,331 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:51:30,331 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-24 23:51:30,332 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [832835652] [2023-11-24 23:51:30,332 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:51:30,332 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:51:30,333 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:51:30,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:51:30,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:51:30,334 INFO L87 Difference]: Start difference. First operand 7475 states and 11873 transitions. Second operand has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-24 23:51:31,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:51:31,168 INFO L93 Difference]: Finished difference Result 19036 states and 29322 transitions. [2023-11-24 23:51:31,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:51:31,169 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 138 [2023-11-24 23:51:31,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:51:31,247 INFO L225 Difference]: With dead ends: 19036 [2023-11-24 23:51:31,247 INFO L226 Difference]: Without dead ends: 13207 [2023-11-24 23:51:31,270 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:51:31,271 INFO L413 NwaCegarLoop]: 3309 mSDtfsCounter, 3519 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3519 SdHoareTripleChecker+Valid, 3554 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-24 23:51:31,272 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3519 Valid, 3554 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-24 23:51:31,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13207 states. [2023-11-24 23:51:32,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13207 to 13171. [2023-11-24 23:51:32,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13171 states, 11531 states have (on average 1.535252796808603) internal successors, (17703), 11566 states have internal predecessors, (17703), 1254 states have call successors, (1254), 385 states have call predecessors, (1254), 384 states have return successors, (1252), 1220 states have call predecessors, (1252), 1252 states have call successors, (1252) [2023-11-24 23:51:32,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13171 states to 13171 states and 20209 transitions. [2023-11-24 23:51:32,156 INFO L78 Accepts]: Start accepts. Automaton has 13171 states and 20209 transitions. Word has length 138 [2023-11-24 23:51:32,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:51:32,157 INFO L495 AbstractCegarLoop]: Abstraction has 13171 states and 20209 transitions. [2023-11-24 23:51:32,157 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-24 23:51:32,157 INFO L276 IsEmpty]: Start isEmpty. Operand 13171 states and 20209 transitions. [2023-11-24 23:51:32,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-11-24 23:51:32,189 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:51:32,189 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:51:32,201 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-24 23:51:32,402 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-24 23:51:32,402 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:51:32,403 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:51:32,403 INFO L85 PathProgramCache]: Analyzing trace with hash -202817502, now seen corresponding path program 1 times [2023-11-24 23:51:32,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:51:32,403 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1429918067] [2023-11-24 23:51:32,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:51:32,404 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:51:32,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:51:32,688 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-24 23:51:32,689 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:51:32,689 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1429918067] [2023-11-24 23:51:32,689 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1429918067] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:51:32,689 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [239276785] [2023-11-24 23:51:32,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:51:32,690 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:51:32,690 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:51:32,691 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:51:32,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-24 23:51:32,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:51:32,976 INFO L262 TraceCheckSpWp]: Trace formula consists of 1018 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-24 23:51:32,981 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:51:33,050 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-24 23:51:33,050 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:51:33,051 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [239276785] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:51:33,051 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:51:33,051 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-24 23:51:33,051 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366740147] [2023-11-24 23:51:33,051 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:51:33,052 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:51:33,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:51:33,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:51:33,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:51:33,053 INFO L87 Difference]: Start difference. First operand 13171 states and 20209 transitions. Second operand has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 2 states have internal predecessors, (110), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-24 23:51:34,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:51:34,427 INFO L93 Difference]: Finished difference Result 36028 states and 54554 transitions. [2023-11-24 23:51:34,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:51:34,428 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 2 states have internal predecessors, (110), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 138 [2023-11-24 23:51:34,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:51:34,556 INFO L225 Difference]: With dead ends: 36028 [2023-11-24 23:51:34,556 INFO L226 Difference]: Without dead ends: 24503 [2023-11-24 23:51:34,608 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:51:34,609 INFO L413 NwaCegarLoop]: 3309 mSDtfsCounter, 3522 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3522 SdHoareTripleChecker+Valid, 3554 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-24 23:51:34,610 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3522 Valid, 3554 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-24 23:51:34,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24503 states. [2023-11-24 23:51:35,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24503 to 24435. [2023-11-24 23:51:35,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24435 states, 21227 states have (on average 1.495783671738823) internal successors, (31751), 21294 states have internal predecessors, (31751), 2438 states have call successors, (2438), 769 states have call predecessors, (2438), 768 states have return successors, (2436), 2372 states have call predecessors, (2436), 2436 states have call successors, (2436) [2023-11-24 23:51:35,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24435 states to 24435 states and 36625 transitions. [2023-11-24 23:51:35,989 INFO L78 Accepts]: Start accepts. Automaton has 24435 states and 36625 transitions. Word has length 138 [2023-11-24 23:51:35,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:51:35,990 INFO L495 AbstractCegarLoop]: Abstraction has 24435 states and 36625 transitions. [2023-11-24 23:51:35,991 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 2 states have internal predecessors, (110), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-24 23:51:35,991 INFO L276 IsEmpty]: Start isEmpty. Operand 24435 states and 36625 transitions. [2023-11-24 23:51:36,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-11-24 23:51:36,033 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:51:36,034 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:51:36,049 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-24 23:51:36,240 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-24 23:51:36,240 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:51:36,241 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:51:36,241 INFO L85 PathProgramCache]: Analyzing trace with hash 1195437890, now seen corresponding path program 1 times [2023-11-24 23:51:36,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:51:36,242 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1512108054] [2023-11-24 23:51:36,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:51:36,244 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:51:36,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:51:36,451 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-24 23:51:36,452 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:51:36,452 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1512108054] [2023-11-24 23:51:36,452 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1512108054] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:51:36,452 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1637501049] [2023-11-24 23:51:36,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:51:36,453 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:51:36,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:51:36,454 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:51:36,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d2d3473-ea15-4e17-bc44-a20d4ea601fb/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-24 23:51:36,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:51:36,739 INFO L262 TraceCheckSpWp]: Trace formula consists of 1012 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-24 23:51:36,744 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:51:36,797 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-24 23:51:36,797 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:51:36,797 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1637501049] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:51:36,797 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:51:36,797 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-24 23:51:36,798 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220889908] [2023-11-24 23:51:36,798 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:51:36,798 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:51:36,799 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:51:36,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:51:36,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:51:36,799 INFO L87 Difference]: Start difference. First operand 24435 states and 36625 transitions. Second operand has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 2 states have internal predecessors, (98), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-24 23:51:38,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:51:38,635 INFO L93 Difference]: Finished difference Result 69628 states and 104218 transitions. [2023-11-24 23:51:38,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:51:38,636 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 2 states have internal predecessors, (98), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 138 [2023-11-24 23:51:38,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:51:38,865 INFO L225 Difference]: With dead ends: 69628 [2023-11-24 23:51:38,866 INFO L226 Difference]: Without dead ends: 46839 [2023-11-24 23:51:38,941 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:51:38,942 INFO L413 NwaCegarLoop]: 3309 mSDtfsCounter, 3534 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3534 SdHoareTripleChecker+Valid, 3554 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-24 23:51:38,943 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3534 Valid, 3554 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-24 23:51:38,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46839 states.