./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.12.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.12.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW --witnessprinter.witness.filename witness.graphml --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 bc6dc2c99e05b6915f0a2e5b5d96221c996d96767aaa6be997dea59c4d6f5f0a --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-4e7fbc6 [2022-11-23 15:40:47,183 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 15:40:47,186 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 15:40:47,222 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 15:40:47,223 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 15:40:47,224 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 15:40:47,226 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 15:40:47,234 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 15:40:47,237 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 15:40:47,243 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 15:40:47,244 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 15:40:47,247 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 15:40:47,247 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 15:40:47,249 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 15:40:47,252 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 15:40:47,254 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 15:40:47,256 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 15:40:47,257 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 15:40:47,258 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 15:40:47,265 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 15:40:47,266 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 15:40:47,268 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 15:40:47,271 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 15:40:47,272 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 15:40:47,282 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 15:40:47,282 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 15:40:47,283 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 15:40:47,285 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 15:40:47,285 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 15:40:47,286 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 15:40:47,287 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 15:40:47,287 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 15:40:47,289 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 15:40:47,290 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 15:40:47,292 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 15:40:47,292 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 15:40:47,293 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 15:40:47,293 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 15:40:47,293 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 15:40:47,295 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 15:40:47,296 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 15:40:47,297 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 15:40:47,334 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 15:40:47,334 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 15:40:47,335 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 15:40:47,335 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 15:40:47,336 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 15:40:47,337 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 15:40:47,337 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 15:40:47,337 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 15:40:47,337 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 15:40:47,338 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 15:40:47,339 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 15:40:47,339 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 15:40:47,339 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 15:40:47,340 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 15:40:47,340 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 15:40:47,340 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 15:40:47,341 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 15:40:47,341 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 15:40:47,342 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 15:40:47,342 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 15:40:47,342 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 15:40:47,343 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 15:40:47,343 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 15:40:47,343 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 15:40:47,343 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 15:40:47,344 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 15:40:47,344 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 15:40:47,344 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 15:40:47,344 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 15:40:47,345 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 15:40:47,345 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 15:40:47,346 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 15:40:47,346 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 15:40:47,346 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 15:40:47,346 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 15:40:47,347 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 15:40:47,347 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 15:40:47,347 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 15:40:47,347 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 15:40:47,348 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 15:40:47,348 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 15:40:47,349 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bc6dc2c99e05b6915f0a2e5b5d96221c996d96767aaa6be997dea59c4d6f5f0a [2022-11-23 15:40:47,617 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 15:40:47,640 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 15:40:47,643 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 15:40:47,644 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 15:40:47,644 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 15:40:47,646 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/systemc/token_ring.12.cil-2.c [2022-11-23 15:40:50,647 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 15:40:50,918 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 15:40:50,919 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/sv-benchmarks/c/systemc/token_ring.12.cil-2.c [2022-11-23 15:40:50,932 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/data/5bfbdc42a/e01a401eb0754c5295dc47c1bba65d46/FLAGe1b6f4f3e [2022-11-23 15:40:50,952 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/data/5bfbdc42a/e01a401eb0754c5295dc47c1bba65d46 [2022-11-23 15:40:50,955 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 15:40:50,956 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 15:40:50,958 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 15:40:50,958 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 15:40:50,962 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 15:40:50,963 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:40:50" (1/1) ... [2022-11-23 15:40:50,964 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@54a4ce50 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:50, skipping insertion in model container [2022-11-23 15:40:50,964 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:40:50" (1/1) ... [2022-11-23 15:40:50,972 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 15:40:51,021 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 15:40:51,166 WARN L237 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_c4dda09c-ad80-4497-8324-e0ec3754106b/sv-benchmarks/c/systemc/token_ring.12.cil-2.c[671,684] [2022-11-23 15:40:51,306 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 15:40:51,321 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 15:40:51,339 WARN L237 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_c4dda09c-ad80-4497-8324-e0ec3754106b/sv-benchmarks/c/systemc/token_ring.12.cil-2.c[671,684] [2022-11-23 15:40:51,464 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 15:40:51,499 INFO L208 MainTranslator]: Completed translation [2022-11-23 15:40:51,500 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:51 WrapperNode [2022-11-23 15:40:51,500 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 15:40:51,501 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 15:40:51,502 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 15:40:51,502 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 15:40:51,510 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:51" (1/1) ... [2022-11-23 15:40:51,524 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:51" (1/1) ... [2022-11-23 15:40:51,569 INFO L138 Inliner]: procedures = 52, calls = 67, calls flagged for inlining = 36, calls inlined = 36, statements flattened = 853 [2022-11-23 15:40:51,570 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 15:40:51,571 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 15:40:51,571 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 15:40:51,571 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 15:40:51,581 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:51" (1/1) ... [2022-11-23 15:40:51,582 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:51" (1/1) ... [2022-11-23 15:40:51,587 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:51" (1/1) ... [2022-11-23 15:40:51,587 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:51" (1/1) ... [2022-11-23 15:40:51,600 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:51" (1/1) ... [2022-11-23 15:40:51,615 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:51" (1/1) ... [2022-11-23 15:40:51,619 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:51" (1/1) ... [2022-11-23 15:40:51,622 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:51" (1/1) ... [2022-11-23 15:40:51,631 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 15:40:51,632 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 15:40:51,632 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 15:40:51,632 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 15:40:51,633 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:51" (1/1) ... [2022-11-23 15:40:51,640 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 15:40:51,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:40:51,673 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 15:40:51,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 15:40:51,755 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 15:40:51,755 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2022-11-23 15:40:51,755 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2022-11-23 15:40:51,755 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2022-11-23 15:40:51,756 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2022-11-23 15:40:51,756 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2022-11-23 15:40:51,756 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2022-11-23 15:40:51,756 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2022-11-23 15:40:51,756 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2022-11-23 15:40:51,757 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2022-11-23 15:40:51,757 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2022-11-23 15:40:51,757 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2022-11-23 15:40:51,757 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2022-11-23 15:40:51,757 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 15:40:51,758 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 15:40:51,758 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 15:40:51,916 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 15:40:51,919 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 15:40:52,914 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 15:40:53,431 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 15:40:53,432 INFO L300 CfgBuilder]: Removed 15 assume(true) statements. [2022-11-23 15:40:53,435 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:40:53 BoogieIcfgContainer [2022-11-23 15:40:53,435 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 15:40:53,439 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 15:40:53,439 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 15:40:53,442 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 15:40:53,443 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:40:50" (1/3) ... [2022-11-23 15:40:53,445 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@759cfe98 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:40:53, skipping insertion in model container [2022-11-23 15:40:53,445 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:40:51" (2/3) ... [2022-11-23 15:40:53,446 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@759cfe98 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:40:53, skipping insertion in model container [2022-11-23 15:40:53,447 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:40:53" (3/3) ... [2022-11-23 15:40:53,448 INFO L112 eAbstractionObserver]: Analyzing ICFG token_ring.12.cil-2.c [2022-11-23 15:40:53,468 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 15:40:53,468 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 15:40:53,540 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 15:40:53,547 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=LoopsAndPotentialCycles, 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;@436f5f02, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 15:40:53,547 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 15:40:53,554 INFO L276 IsEmpty]: Start isEmpty. Operand has 188 states, 154 states have (on average 1.5584415584415585) internal successors, (240), 156 states have internal predecessors, (240), 26 states have call successors, (26), 6 states have call predecessors, (26), 6 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2022-11-23 15:40:53,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-23 15:40:53,569 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:40:53,570 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] [2022-11-23 15:40:53,571 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:40:53,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:40:53,579 INFO L85 PathProgramCache]: Analyzing trace with hash -1262094952, now seen corresponding path program 1 times [2022-11-23 15:40:53,590 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:40:53,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1648522820] [2022-11-23 15:40:53,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:40:53,592 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:40:53,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:40:54,187 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:40:54,187 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:40:54,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1648522820] [2022-11-23 15:40:54,188 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1648522820] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:40:54,189 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:40:54,189 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-23 15:40:54,191 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682066178] [2022-11-23 15:40:54,192 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:40:54,198 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 15:40:54,198 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:40:54,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 15:40:54,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 15:40:54,234 INFO L87 Difference]: Start difference. First operand has 188 states, 154 states have (on average 1.5584415584415585) internal successors, (240), 156 states have internal predecessors, (240), 26 states have call successors, (26), 6 states have call predecessors, (26), 6 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-23 15:40:54,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:40:54,838 INFO L93 Difference]: Finished difference Result 548 states and 868 transitions. [2022-11-23 15:40:54,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 15:40:54,841 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 66 [2022-11-23 15:40:54,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:40:54,860 INFO L225 Difference]: With dead ends: 548 [2022-11-23 15:40:54,861 INFO L226 Difference]: Without dead ends: 361 [2022-11-23 15:40:54,871 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 [2022-11-23 15:40:54,875 INFO L413 NwaCegarLoop]: 454 mSDtfsCounter, 512 mSDsluCounter, 356 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 512 SdHoareTripleChecker+Valid, 810 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-23 15:40:54,876 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [512 Valid, 810 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 304 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-23 15:40:54,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 361 states. [2022-11-23 15:40:54,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 361 to 360. [2022-11-23 15:40:54,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 299 states have (on average 1.5250836120401339) internal successors, (456), 301 states have internal predecessors, (456), 48 states have call successors, (48), 12 states have call predecessors, (48), 12 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2022-11-23 15:40:54,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 552 transitions. [2022-11-23 15:40:54,985 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 552 transitions. Word has length 66 [2022-11-23 15:40:54,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:40:54,986 INFO L495 AbstractCegarLoop]: Abstraction has 360 states and 552 transitions. [2022-11-23 15:40:54,987 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-23 15:40:54,987 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 552 transitions. [2022-11-23 15:40:55,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-11-23 15:40:55,001 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:40:55,002 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] [2022-11-23 15:40:55,002 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-23 15:40:55,002 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:40:55,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:40:55,003 INFO L85 PathProgramCache]: Analyzing trace with hash -1731208306, now seen corresponding path program 1 times [2022-11-23 15:40:55,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:40:55,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [856922425] [2022-11-23 15:40:55,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:40:55,004 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:40:55,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:40:55,458 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-23 15:40:55,459 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:40:55,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [856922425] [2022-11-23 15:40:55,460 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [856922425] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:40:55,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [258424432] [2022-11-23 15:40:55,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:40:55,461 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:40:55,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:40:55,467 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:40:55,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 15:40:55,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:40:55,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 992 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 15:40:55,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:40:55,940 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 15:40:55,941 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 15:40:55,941 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [258424432] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:40:55,941 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 15:40:55,942 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 15:40:55,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215885033] [2022-11-23 15:40:55,943 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:40:55,944 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 15:40:55,944 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:40:55,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 15:40:55,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 15:40:55,945 INFO L87 Difference]: Start difference. First operand 360 states and 552 transitions. Second operand has 3 states, 3 states have (on average 37.0) internal successors, (111), 2 states have internal predecessors, (111), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 15:40:56,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:40:56,160 INFO L93 Difference]: Finished difference Result 1063 states and 1659 transitions. [2022-11-23 15:40:56,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 15:40:56,161 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.0) internal successors, (111), 2 states have internal predecessors, (111), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 135 [2022-11-23 15:40:56,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:40:56,176 INFO L225 Difference]: With dead ends: 1063 [2022-11-23 15:40:56,176 INFO L226 Difference]: Without dead ends: 708 [2022-11-23 15:40:56,178 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 15:40:56,179 INFO L413 NwaCegarLoop]: 288 mSDtfsCounter, 232 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 232 SdHoareTripleChecker+Valid, 514 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:40:56,180 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [232 Valid, 514 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:40:56,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 708 states. [2022-11-23 15:40:56,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 708 to 704. [2022-11-23 15:40:56,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 704 states, 589 states have (on average 1.5229202037351444) internal successors, (897), 592 states have internal predecessors, (897), 90 states have call successors, (90), 24 states have call predecessors, (90), 24 states have return successors, (90), 88 states have call predecessors, (90), 90 states have call successors, (90) [2022-11-23 15:40:56,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 704 states to 704 states and 1077 transitions. [2022-11-23 15:40:56,253 INFO L78 Accepts]: Start accepts. Automaton has 704 states and 1077 transitions. Word has length 135 [2022-11-23 15:40:56,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:40:56,255 INFO L495 AbstractCegarLoop]: Abstraction has 704 states and 1077 transitions. [2022-11-23 15:40:56,255 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.0) internal successors, (111), 2 states have internal predecessors, (111), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 15:40:56,255 INFO L276 IsEmpty]: Start isEmpty. Operand 704 states and 1077 transitions. [2022-11-23 15:40:56,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-11-23 15:40:56,259 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:40:56,260 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] [2022-11-23 15:40:56,274 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 15:40:56,466 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:40:56,467 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:40:56,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:40:56,467 INFO L85 PathProgramCache]: Analyzing trace with hash 2096052334, now seen corresponding path program 1 times [2022-11-23 15:40:56,467 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:40:56,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039961724] [2022-11-23 15:40:56,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:40:56,468 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:40:56,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:40:56,730 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-23 15:40:56,730 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:40:56,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039961724] [2022-11-23 15:40:56,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1039961724] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:40:56,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [913006039] [2022-11-23 15:40:56,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:40:56,732 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:40:56,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:40:56,733 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:40:56,760 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 15:40:56,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:40:57,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 986 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 15:40:57,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:40:57,100 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-23 15:40:57,100 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 15:40:57,100 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [913006039] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:40:57,100 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 15:40:57,100 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 15:40:57,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396870247] [2022-11-23 15:40:57,101 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:40:57,101 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 15:40:57,101 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:40:57,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 15:40:57,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 15:40:57,102 INFO L87 Difference]: Start difference. First operand 704 states and 1077 transitions. Second operand has 3 states, 3 states have (on average 34.0) internal successors, (102), 2 states have internal predecessors, (102), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 15:40:57,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:40:57,332 INFO L93 Difference]: Finished difference Result 2089 states and 3252 transitions. [2022-11-23 15:40:57,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 15:40:57,332 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 2 states have internal predecessors, (102), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 135 [2022-11-23 15:40:57,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:40:57,346 INFO L225 Difference]: With dead ends: 2089 [2022-11-23 15:40:57,347 INFO L226 Difference]: Without dead ends: 1390 [2022-11-23 15:40:57,350 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 15:40:57,353 INFO L413 NwaCegarLoop]: 276 mSDtfsCounter, 241 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 502 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:40:57,354 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [241 Valid, 502 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:40:57,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1390 states. [2022-11-23 15:40:57,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1390 to 1384. [2022-11-23 15:40:57,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1384 states, 1163 states have (on average 1.5193465176268273) internal successors, (1767), 1168 states have internal predecessors, (1767), 172 states have call successors, (172), 48 states have call predecessors, (172), 48 states have return successors, (172), 168 states have call predecessors, (172), 172 states have call successors, (172) [2022-11-23 15:40:57,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1384 states to 1384 states and 2111 transitions. [2022-11-23 15:40:57,451 INFO L78 Accepts]: Start accepts. Automaton has 1384 states and 2111 transitions. Word has length 135 [2022-11-23 15:40:57,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:40:57,451 INFO L495 AbstractCegarLoop]: Abstraction has 1384 states and 2111 transitions. [2022-11-23 15:40:57,451 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 2 states have internal predecessors, (102), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 15:40:57,452 INFO L276 IsEmpty]: Start isEmpty. Operand 1384 states and 2111 transitions. [2022-11-23 15:40:57,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-11-23 15:40:57,457 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:40:57,457 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] [2022-11-23 15:40:57,464 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 15:40:57,664 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:40:57,664 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:40:57,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:40:57,665 INFO L85 PathProgramCache]: Analyzing trace with hash -258320498, now seen corresponding path program 1 times [2022-11-23 15:40:57,665 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:40:57,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [894218293] [2022-11-23 15:40:57,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:40:57,666 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:40:57,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:40:57,900 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-23 15:40:57,901 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:40:57,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [894218293] [2022-11-23 15:40:57,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [894218293] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:40:57,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [768795315] [2022-11-23 15:40:57,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:40:57,906 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:40:57,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:40:57,908 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:40:57,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 15:40:58,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:40:58,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 980 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 15:40:58,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:40:58,233 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-23 15:40:58,233 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 15:40:58,233 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [768795315] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:40:58,233 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 15:40:58,234 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 15:40:58,234 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329002854] [2022-11-23 15:40:58,234 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:40:58,236 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 15:40:58,236 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:40:58,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 15:40:58,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 15:40:58,238 INFO L87 Difference]: Start difference. First operand 1384 states and 2111 transitions. Second operand has 3 states, 3 states have (on average 28.0) internal successors, (84), 2 states have internal predecessors, (84), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 15:40:58,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:40:58,491 INFO L93 Difference]: Finished difference Result 4117 states and 6388 transitions. [2022-11-23 15:40:58,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 15:40:58,492 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 2 states have internal predecessors, (84), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 135 [2022-11-23 15:40:58,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:40:58,509 INFO L225 Difference]: With dead ends: 4117 [2022-11-23 15:40:58,509 INFO L226 Difference]: Without dead ends: 2738 [2022-11-23 15:40:58,517 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 15:40:58,519 INFO L413 NwaCegarLoop]: 275 mSDtfsCounter, 259 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:40:58,523 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [259 Valid, 501 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:40:58,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2738 states. [2022-11-23 15:40:58,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2738 to 2728. [2022-11-23 15:40:58,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2728 states, 2299 states have (on average 1.5150065245759026) internal successors, (3483), 2308 states have internal predecessors, (3483), 332 states have call successors, (332), 96 states have call predecessors, (332), 96 states have return successors, (332), 324 states have call predecessors, (332), 332 states have call successors, (332) [2022-11-23 15:40:58,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2728 states to 2728 states and 4147 transitions. [2022-11-23 15:40:58,697 INFO L78 Accepts]: Start accepts. Automaton has 2728 states and 4147 transitions. Word has length 135 [2022-11-23 15:40:58,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:40:58,698 INFO L495 AbstractCegarLoop]: Abstraction has 2728 states and 4147 transitions. [2022-11-23 15:40:58,698 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 2 states have internal predecessors, (84), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 15:40:58,698 INFO L276 IsEmpty]: Start isEmpty. Operand 2728 states and 4147 transitions. [2022-11-23 15:40:58,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-11-23 15:40:58,704 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:40:58,705 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] [2022-11-23 15:40:58,715 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 15:40:58,915 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:40:58,915 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:40:58,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:40:58,916 INFO L85 PathProgramCache]: Analyzing trace with hash 1185410734, now seen corresponding path program 1 times [2022-11-23 15:40:58,916 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:40:58,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477193825] [2022-11-23 15:40:58,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:40:58,916 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:40:58,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:40:59,135 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-23 15:40:59,136 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:40:59,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477193825] [2022-11-23 15:40:59,136 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [477193825] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:40:59,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1264798915] [2022-11-23 15:40:59,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:40:59,137 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:40:59,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:40:59,138 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:40:59,158 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 15:40:59,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:40:59,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 974 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 15:40:59,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:40:59,483 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-23 15:40:59,484 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 15:40:59,484 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1264798915] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:40:59,484 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 15:40:59,484 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 15:40:59,485 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076891889] [2022-11-23 15:40:59,485 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:40:59,485 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 15:40:59,486 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:40:59,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 15:40:59,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 15:40:59,487 INFO L87 Difference]: Start difference. First operand 2728 states and 4147 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 15:40:59,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:40:59,861 INFO L93 Difference]: Finished difference Result 8125 states and 12560 transitions. [2022-11-23 15:40:59,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 15:40:59,862 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 135 [2022-11-23 15:40:59,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:40:59,887 INFO L225 Difference]: With dead ends: 8125 [2022-11-23 15:40:59,888 INFO L226 Difference]: Without dead ends: 5402 [2022-11-23 15:40:59,899 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 15:40:59,900 INFO L413 NwaCegarLoop]: 285 mSDtfsCounter, 262 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 511 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:40:59,901 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [262 Valid, 511 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:40:59,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5402 states. [2022-11-23 15:41:00,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5402 to 5384. [2022-11-23 15:41:00,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5384 states, 4547 states have (on average 1.510226522982186) internal successors, (6867), 4564 states have internal predecessors, (6867), 644 states have call successors, (644), 192 states have call predecessors, (644), 192 states have return successors, (644), 628 states have call predecessors, (644), 644 states have call successors, (644) [2022-11-23 15:41:00,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5384 states to 5384 states and 8155 transitions. [2022-11-23 15:41:00,201 INFO L78 Accepts]: Start accepts. Automaton has 5384 states and 8155 transitions. Word has length 135 [2022-11-23 15:41:00,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:41:00,202 INFO L495 AbstractCegarLoop]: Abstraction has 5384 states and 8155 transitions. [2022-11-23 15:41:00,202 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 15:41:00,202 INFO L276 IsEmpty]: Start isEmpty. Operand 5384 states and 8155 transitions. [2022-11-23 15:41:00,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-11-23 15:41:00,212 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:41:00,212 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] [2022-11-23 15:41:00,224 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 15:41:00,419 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:41:00,419 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:41:00,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:41:00,420 INFO L85 PathProgramCache]: Analyzing trace with hash 1580041102, now seen corresponding path program 1 times [2022-11-23 15:41:00,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:41:00,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271970639] [2022-11-23 15:41:00,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:41:00,420 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:41:00,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:41:00,596 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 15:41:00,596 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:41:00,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1271970639] [2022-11-23 15:41:00,597 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1271970639] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:41:00,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1439912391] [2022-11-23 15:41:00,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:41:00,597 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:41:00,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:41:00,599 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:41:00,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 15:41:00,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:41:00,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 968 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 15:41:00,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:41:00,956 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-23 15:41:00,957 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 15:41:00,957 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1439912391] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:41:00,957 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 15:41:00,957 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2022-11-23 15:41:00,958 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425040036] [2022-11-23 15:41:00,958 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:41:00,958 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 15:41:00,958 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:41:00,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 15:41:00,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 15:41:00,959 INFO L87 Difference]: Start difference. First operand 5384 states and 8155 transitions. Second operand has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 15:41:01,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:41:01,538 INFO L93 Difference]: Finished difference Result 16045 states and 24704 transitions. [2022-11-23 15:41:01,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 15:41:01,539 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 135 [2022-11-23 15:41:01,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:41:01,603 INFO L225 Difference]: With dead ends: 16045 [2022-11-23 15:41:01,604 INFO L226 Difference]: Without dead ends: 10666 [2022-11-23 15:41:01,626 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 15:41:01,627 INFO L413 NwaCegarLoop]: 256 mSDtfsCounter, 247 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 247 SdHoareTripleChecker+Valid, 482 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:41:01,627 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [247 Valid, 482 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:41:01,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10666 states. [2022-11-23 15:41:02,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10666 to 10632. [2022-11-23 15:41:02,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10632 states, 8995 states have (on average 1.5051695386325736) internal successors, (13539), 9028 states have internal predecessors, (13539), 1252 states have call successors, (1252), 384 states have call predecessors, (1252), 384 states have return successors, (1252), 1220 states have call predecessors, (1252), 1252 states have call successors, (1252) [2022-11-23 15:41:02,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10632 states to 10632 states and 16043 transitions. [2022-11-23 15:41:02,331 INFO L78 Accepts]: Start accepts. Automaton has 10632 states and 16043 transitions. Word has length 135 [2022-11-23 15:41:02,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:41:02,332 INFO L495 AbstractCegarLoop]: Abstraction has 10632 states and 16043 transitions. [2022-11-23 15:41:02,333 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 15:41:02,333 INFO L276 IsEmpty]: Start isEmpty. Operand 10632 states and 16043 transitions. [2022-11-23 15:41:02,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-11-23 15:41:02,353 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:41:02,353 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] [2022-11-23 15:41:02,365 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 15:41:02,560 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-23 15:41:02,561 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:41:02,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:41:02,561 INFO L85 PathProgramCache]: Analyzing trace with hash -1551054162, now seen corresponding path program 1 times [2022-11-23 15:41:02,561 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:41:02,561 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139453856] [2022-11-23 15:41:02,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:41:02,561 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:41:02,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:41:02,759 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 15:41:02,759 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:41:02,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139453856] [2022-11-23 15:41:02,760 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1139453856] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:41:02,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1816605146] [2022-11-23 15:41:02,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:41:02,760 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:41:02,760 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:41:02,763 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:41:02,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 15:41:03,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:41:03,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 962 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 15:41:03,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:41:03,073 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-23 15:41:03,074 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 15:41:03,074 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1816605146] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:41:03,074 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 15:41:03,074 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 4 [2022-11-23 15:41:03,075 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643856602] [2022-11-23 15:41:03,075 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:41:03,076 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 15:41:03,076 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:41:03,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 15:41:03,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 15:41:03,077 INFO L87 Difference]: Start difference. First operand 10632 states and 16043 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 15:41:04,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:41:04,133 INFO L93 Difference]: Finished difference Result 31693 states and 48592 transitions. [2022-11-23 15:41:04,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 15:41:04,134 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 135 [2022-11-23 15:41:04,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:41:04,254 INFO L225 Difference]: With dead ends: 31693 [2022-11-23 15:41:04,255 INFO L226 Difference]: Without dead ends: 21066 [2022-11-23 15:41:04,299 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 15:41:04,300 INFO L413 NwaCegarLoop]: 256 mSDtfsCounter, 253 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 253 SdHoareTripleChecker+Valid, 482 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:41:04,300 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [253 Valid, 482 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:41:04,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21066 states. [2022-11-23 15:41:05,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21066 to 21000. [2022-11-23 15:41:05,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21000 states, 17795 states have (on average 1.499915706659174) internal successors, (26691), 17860 states have internal predecessors, (26691), 2436 states have call successors, (2436), 768 states have call predecessors, (2436), 768 states have return successors, (2436), 2372 states have call predecessors, (2436), 2436 states have call successors, (2436) [2022-11-23 15:41:05,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21000 states to 21000 states and 31563 transitions. [2022-11-23 15:41:05,774 INFO L78 Accepts]: Start accepts. Automaton has 21000 states and 31563 transitions. Word has length 135 [2022-11-23 15:41:05,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:41:05,774 INFO L495 AbstractCegarLoop]: Abstraction has 21000 states and 31563 transitions. [2022-11-23 15:41:05,775 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 15:41:05,775 INFO L276 IsEmpty]: Start isEmpty. Operand 21000 states and 31563 transitions. [2022-11-23 15:41:05,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-11-23 15:41:05,815 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:41:05,815 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] [2022-11-23 15:41:05,832 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-23 15:41:06,023 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:41:06,023 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:41:06,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:41:06,024 INFO L85 PathProgramCache]: Analyzing trace with hash -1662895666, now seen corresponding path program 1 times [2022-11-23 15:41:06,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:41:06,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1872078289] [2022-11-23 15:41:06,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:41:06,025 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:41:06,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:41:06,156 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-11-23 15:41:06,156 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:41:06,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1872078289] [2022-11-23 15:41:06,156 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1872078289] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:41:06,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1984241056] [2022-11-23 15:41:06,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:41:06,157 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:41:06,157 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:41:06,158 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:41:06,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 15:41:06,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:41:06,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 956 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 15:41:06,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:41:06,505 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-23 15:41:06,506 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 15:41:06,506 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1984241056] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:41:06,506 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 15:41:06,506 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 4 [2022-11-23 15:41:06,507 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424287133] [2022-11-23 15:41:06,507 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:41:06,511 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 15:41:06,511 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:41:06,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 15:41:06,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 15:41:06,512 INFO L87 Difference]: Start difference. First operand 21000 states and 31563 transitions. Second operand has 3 states, 3 states have (on average 36.0) internal successors, (108), 2 states have internal predecessors, (108), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 15:41:08,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:41:08,585 INFO L93 Difference]: Finished difference Result 62605 states and 95568 transitions. [2022-11-23 15:41:08,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 15:41:08,586 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.0) internal successors, (108), 2 states have internal predecessors, (108), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 135 [2022-11-23 15:41:08,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:41:08,790 INFO L225 Difference]: With dead ends: 62605 [2022-11-23 15:41:08,790 INFO L226 Difference]: Without dead ends: 41610 [2022-11-23 15:41:08,862 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 15:41:08,864 INFO L413 NwaCegarLoop]: 256 mSDtfsCounter, 235 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 235 SdHoareTripleChecker+Valid, 482 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:41:08,864 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [235 Valid, 482 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:41:08,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41610 states. [2022-11-23 15:41:11,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41610 to 41480. [2022-11-23 15:41:11,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41480 states, 35203 states have (on average 1.4945033093770417) internal successors, (52611), 35332 states have internal predecessors, (52611), 4740 states have call successors, (4740), 1536 states have call predecessors, (4740), 1536 states have return successors, (4740), 4612 states have call predecessors, (4740), 4740 states have call successors, (4740) [2022-11-23 15:41:11,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41480 states to 41480 states and 62091 transitions. [2022-11-23 15:41:11,329 INFO L78 Accepts]: Start accepts. Automaton has 41480 states and 62091 transitions. Word has length 135 [2022-11-23 15:41:11,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:41:11,330 INFO L495 AbstractCegarLoop]: Abstraction has 41480 states and 62091 transitions. [2022-11-23 15:41:11,330 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.0) internal successors, (108), 2 states have internal predecessors, (108), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 15:41:11,330 INFO L276 IsEmpty]: Start isEmpty. Operand 41480 states and 62091 transitions. [2022-11-23 15:41:11,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-11-23 15:41:11,400 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:41:11,400 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] [2022-11-23 15:41:11,408 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 15:41:11,608 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c4dda09c-ad80-4497-8324-e0ec3754106b/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:41:11,608 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:41:11,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:41:11,609 INFO L85 PathProgramCache]: Analyzing trace with hash 2056990958, now seen corresponding path program 1 times [2022-11-23 15:41:11,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:41:11,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638717302] [2022-11-23 15:41:11,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:41:11,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:41:11,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:41:12,436 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-11-23 15:41:12,436 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:41:12,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638717302] [2022-11-23 15:41:12,437 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [638717302] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:41:12,437 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:41:12,437 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-23 15:41:12,437 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172902678] [2022-11-23 15:41:12,437 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:41:12,438 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 15:41:12,438 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:41:12,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 15:41:12,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-23 15:41:12,439 INFO L87 Difference]: Start difference. First operand 41480 states and 62091 transitions. Second operand has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-23 15:41:16,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:41:16,499 INFO L93 Difference]: Finished difference Result 113420 states and 169933 transitions. [2022-11-23 15:41:16,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-23 15:41:16,499 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 135 [2022-11-23 15:41:16,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:41:17,165 INFO L225 Difference]: With dead ends: 113420 [2022-11-23 15:41:17,165 INFO L226 Difference]: Without dead ends: 71946 [2022-11-23 15:41:17,267 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-11-23 15:41:17,269 INFO L413 NwaCegarLoop]: 277 mSDtfsCounter, 971 mSDsluCounter, 538 mSDsCounter, 0 mSdLazyCounter, 309 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 977 SdHoareTripleChecker+Valid, 815 SdHoareTripleChecker+Invalid, 448 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 309 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-23 15:41:17,270 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [977 Valid, 815 Invalid, 448 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [139 Valid, 309 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-23 15:41:17,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71946 states. [2022-11-23 15:41:21,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71946 to 61704. [2022-11-23 15:41:21,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61704 states, 52355 states have (on average 1.4901919587431955) internal successors, (78019), 52548 states have internal predecessors, (78019), 7044 states have call successors, (7044), 2304 states have call predecessors, (7044), 2304 states have return successors, (7044), 6852 states have call predecessors, (7044), 7044 states have call successors, (7044) [2022-11-23 15:41:21,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61704 states to 61704 states and 92107 transitions. [2022-11-23 15:41:21,759 INFO L78 Accepts]: Start accepts. Automaton has 61704 states and 92107 transitions. Word has length 135 [2022-11-23 15:41:21,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:41:21,761 INFO L495 AbstractCegarLoop]: Abstraction has 61704 states and 92107 transitions. [2022-11-23 15:41:21,762 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-23 15:41:21,762 INFO L276 IsEmpty]: Start isEmpty. Operand 61704 states and 92107 transitions. [2022-11-23 15:41:21,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2022-11-23 15:41:21,899 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:41:21,900 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] [2022-11-23 15:41:21,900 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-23 15:41:21,901 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:41:21,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:41:21,901 INFO L85 PathProgramCache]: Analyzing trace with hash 487886790, now seen corresponding path program 1 times [2022-11-23 15:41:21,901 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:41:21,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532447301] [2022-11-23 15:41:21,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:41:21,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:41:21,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:41:22,985 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-11-23 15:41:22,986 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:41:22,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532447301] [2022-11-23 15:41:22,986 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1532447301] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:41:22,986 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:41:22,986 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-23 15:41:22,986 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883876909] [2022-11-23 15:41:22,986 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:41:22,987 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 15:41:22,987 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:41:22,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 15:41:22,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-23 15:41:22,987 INFO L87 Difference]: Start difference. First operand 61704 states and 92107 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-23 15:41:30,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:41:30,728 INFO L93 Difference]: Finished difference Result 216332 states and 322510 transitions. [2022-11-23 15:41:30,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-23 15:41:30,729 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 136 [2022-11-23 15:41:30,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:41:31,863 INFO L225 Difference]: With dead ends: 216332 [2022-11-23 15:41:31,863 INFO L226 Difference]: Without dead ends: 154634 [2022-11-23 15:41:32,065 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-11-23 15:41:32,066 INFO L413 NwaCegarLoop]: 257 mSDtfsCounter, 1135 mSDsluCounter, 459 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1156 SdHoareTripleChecker+Valid, 716 SdHoareTripleChecker+Invalid, 437 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-23 15:41:32,067 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1156 Valid, 716 Invalid, 437 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 296 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-23 15:41:32,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154634 states. [2022-11-23 15:41:40,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154634 to 121096. [2022-11-23 15:41:40,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121096 states, 102787 states have (on average 1.4844192358955899) internal successors, (152579), 103172 states have internal predecessors, (152579), 13700 states have call successors, (13700), 4608 states have call predecessors, (13700), 4608 states have return successors, (13700), 13316 states have call predecessors, (13700), 13700 states have call successors, (13700) [2022-11-23 15:41:40,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121096 states to 121096 states and 179979 transitions. [2022-11-23 15:41:40,738 INFO L78 Accepts]: Start accepts. Automaton has 121096 states and 179979 transitions. Word has length 136 [2022-11-23 15:41:40,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:41:40,738 INFO L495 AbstractCegarLoop]: Abstraction has 121096 states and 179979 transitions. [2022-11-23 15:41:40,739 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-23 15:41:40,739 INFO L276 IsEmpty]: Start isEmpty. Operand 121096 states and 179979 transitions. [2022-11-23 15:41:40,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-11-23 15:41:40,900 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:41:40,900 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] [2022-11-23 15:41:40,900 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-11-23 15:41:40,901 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:41:40,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:41:40,901 INFO L85 PathProgramCache]: Analyzing trace with hash -633911574, now seen corresponding path program 1 times [2022-11-23 15:41:40,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:41:40,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1470757181] [2022-11-23 15:41:40,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:41:40,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:41:40,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:41:41,798 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-11-23 15:41:41,798 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:41:41,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1470757181] [2022-11-23 15:41:41,799 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1470757181] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:41:41,799 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:41:41,799 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-23 15:41:41,799 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085191022] [2022-11-23 15:41:41,799 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:41:41,800 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 15:41:41,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:41:41,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 15:41:41,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-23 15:41:41,801 INFO L87 Difference]: Start difference. First operand 121096 states and 179979 transitions. Second operand has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8)