./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem15_label15.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6a47aea7 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem15_label15.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl --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 fa5ccf392f2d1c985715fbaacafc407291d4df2053e62d51fc1d2a5c2311799c --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:46:57,874 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:46:57,877 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:46:57,918 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:46:57,922 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:46:57,928 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:46:57,932 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:46:57,936 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:46:57,939 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:46:57,947 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:46:57,948 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:46:57,950 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:46:57,950 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:46:57,953 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:46:57,957 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:46:57,963 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:46:57,965 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:46:57,966 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:46:57,972 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:46:57,977 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:46:57,981 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:46:57,983 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:46:57,986 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:46:57,987 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:46:57,994 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:46:57,995 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:46:57,995 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:46:57,997 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:46:57,998 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:46:57,999 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:46:58,000 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:46:58,001 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:46:58,003 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:46:58,004 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:46:58,006 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:46:58,006 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:46:58,007 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:46:58,007 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:46:58,008 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:46:58,009 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:46:58,009 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:46:58,010 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 16:46:58,061 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:46:58,062 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:46:58,063 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:46:58,063 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:46:58,070 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:46:58,070 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:46:58,070 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:46:58,071 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:46:58,071 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:46:58,071 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 16:46:58,072 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:46:58,072 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:46:58,073 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 16:46:58,073 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 16:46:58,073 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:46:58,073 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 16:46:58,074 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 16:46:58,074 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 16:46:58,075 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:46:58,076 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:46:58,076 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 16:46:58,076 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:46:58,076 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:46:58,076 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:46:58,077 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:46:58,077 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:46:58,078 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:46:58,079 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:46:58,079 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:46:58,079 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:46:58,079 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:46:58,080 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:46:58,080 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:46:58,080 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:46:58,080 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:46:58,081 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:46:58,081 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 16:46:58,081 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 16:46:58,081 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:46:58,082 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:46:58,082 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:46:58,082 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fa5ccf392f2d1c985715fbaacafc407291d4df2053e62d51fc1d2a5c2311799c [2021-11-23 16:46:58,348 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:46:58,368 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:46:58,371 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:46:58,372 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:46:58,373 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:46:58,374 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/eca-rers2012/Problem15_label15.c [2021-11-23 16:46:58,442 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/data/fc3e33aa5/ba7734aff4a24a3b85d43d8c72bd35e2/FLAG052282742 [2021-11-23 16:46:59,167 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:46:59,168 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/sv-benchmarks/c/eca-rers2012/Problem15_label15.c [2021-11-23 16:46:59,194 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/data/fc3e33aa5/ba7734aff4a24a3b85d43d8c72bd35e2/FLAG052282742 [2021-11-23 16:46:59,306 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/data/fc3e33aa5/ba7734aff4a24a3b85d43d8c72bd35e2 [2021-11-23 16:46:59,311 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:46:59,313 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:46:59,315 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:46:59,316 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:46:59,319 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:46:59,320 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:46:59" (1/1) ... [2021-11-23 16:46:59,322 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d68490a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:59, skipping insertion in model container [2021-11-23 16:46:59,322 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:46:59" (1/1) ... [2021-11-23 16:46:59,330 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:46:59,421 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:46:59,650 WARN L230 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_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/sv-benchmarks/c/eca-rers2012/Problem15_label15.c[2445,2458] [2021-11-23 16:47:00,198 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:47:00,207 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:47:00,232 WARN L230 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_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/sv-benchmarks/c/eca-rers2012/Problem15_label15.c[2445,2458] [2021-11-23 16:47:00,495 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:47:00,513 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:47:00,514 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:00 WrapperNode [2021-11-23 16:47:00,514 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:47:00,515 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:47:00,515 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:47:00,515 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:47:00,523 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:00" (1/1) ... [2021-11-23 16:47:00,575 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:00" (1/1) ... [2021-11-23 16:47:00,805 INFO L137 Inliner]: procedures = 15, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 1758 [2021-11-23 16:47:00,805 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:47:00,807 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:47:00,807 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:47:00,808 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:47:00,816 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:00" (1/1) ... [2021-11-23 16:47:00,817 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:00" (1/1) ... [2021-11-23 16:47:00,870 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:00" (1/1) ... [2021-11-23 16:47:00,871 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:00" (1/1) ... [2021-11-23 16:47:01,072 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:00" (1/1) ... [2021-11-23 16:47:01,100 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:00" (1/1) ... [2021-11-23 16:47:01,138 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:00" (1/1) ... [2021-11-23 16:47:01,179 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:47:01,181 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:47:01,181 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:47:01,181 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:47:01,182 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:00" (1/1) ... [2021-11-23 16:47:01,189 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:47:01,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:01,217 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:47:01,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:47:01,263 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:47:01,263 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 16:47:01,263 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:47:01,263 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:47:01,349 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:47:01,351 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:47:04,776 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:47:04,824 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.addBranchEncoders(TransFormulaBuilder.java:170) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.parallelComposition(TransFormulaUtils.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.ParallelComposition.(ParallelComposition.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CodeBlockFactory.constructParallelComposition(CodeBlockFactory.java:109) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.composeParallel(CfgBuilder.java:1792) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.(CfgBuilder.java:1653) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:88) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 16:47:04,830 INFO L158 Benchmark]: Toolchain (without parser) took 5514.84ms. Allocated memory was 107.0MB in the beginning and 226.5MB in the end (delta: 119.5MB). Free memory was 62.8MB in the beginning and 91.5MB in the end (delta: -28.7MB). Peak memory consumption was 98.6MB. Max. memory is 16.1GB. [2021-11-23 16:47:04,831 INFO L158 Benchmark]: CDTParser took 0.32ms. Allocated memory is still 107.0MB. Free memory is still 85.1MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 16:47:04,833 INFO L158 Benchmark]: CACSL2BoogieTranslator took 1198.95ms. Allocated memory was 107.0MB in the beginning and 130.0MB in the end (delta: 23.1MB). Free memory was 62.6MB in the beginning and 63.6MB in the end (delta: -957.5kB). Peak memory consumption was 24.1MB. Max. memory is 16.1GB. [2021-11-23 16:47:04,834 INFO L158 Benchmark]: Boogie Procedure Inliner took 290.77ms. Allocated memory is still 130.0MB. Free memory was 63.6MB in the beginning and 63.0MB in the end (delta: 571.2kB). Peak memory consumption was 24.5MB. Max. memory is 16.1GB. [2021-11-23 16:47:04,835 INFO L158 Benchmark]: Boogie Preprocessor took 372.20ms. Allocated memory is still 130.0MB. Free memory was 63.0MB in the beginning and 60.8MB in the end (delta: 2.2MB). Peak memory consumption was 30.0MB. Max. memory is 16.1GB. [2021-11-23 16:47:04,836 INFO L158 Benchmark]: RCFGBuilder took 3646.46ms. Allocated memory was 130.0MB in the beginning and 226.5MB in the end (delta: 96.5MB). Free memory was 60.8MB in the beginning and 91.5MB in the end (delta: -30.7MB). Peak memory consumption was 74.5MB. Max. memory is 16.1GB. [2021-11-23 16:47:04,845 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32ms. Allocated memory is still 107.0MB. Free memory is still 85.1MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 1198.95ms. Allocated memory was 107.0MB in the beginning and 130.0MB in the end (delta: 23.1MB). Free memory was 62.6MB in the beginning and 63.6MB in the end (delta: -957.5kB). Peak memory consumption was 24.1MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 290.77ms. Allocated memory is still 130.0MB. Free memory was 63.6MB in the beginning and 63.0MB in the end (delta: 571.2kB). Peak memory consumption was 24.5MB. Max. memory is 16.1GB. * Boogie Preprocessor took 372.20ms. Allocated memory is still 130.0MB. Free memory was 63.0MB in the beginning and 60.8MB in the end (delta: 2.2MB). Peak memory consumption was 30.0MB. Max. memory is 16.1GB. * RCFGBuilder took 3646.46ms. Allocated memory was 130.0MB in the beginning and 226.5MB in the end (delta: 96.5MB). Free memory was 60.8MB in the beginning and 91.5MB in the end (delta: -30.7MB). Peak memory consumption was 74.5MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 16:47:04,876 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem15_label15.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl --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 fa5ccf392f2d1c985715fbaacafc407291d4df2053e62d51fc1d2a5c2311799c --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:47:07,494 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:47:07,496 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:47:07,554 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:47:07,555 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:47:07,561 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:47:07,563 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:47:07,566 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:47:07,569 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:47:07,570 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:47:07,571 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:47:07,573 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:47:07,574 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:47:07,575 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:47:07,577 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:47:07,578 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:47:07,580 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:47:07,581 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:47:07,583 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:47:07,586 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:47:07,588 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:47:07,589 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:47:07,591 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:47:07,592 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:47:07,596 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:47:07,597 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:47:07,597 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:47:07,598 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:47:07,599 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:47:07,600 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:47:07,601 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:47:07,602 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:47:07,603 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:47:07,605 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:47:07,606 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:47:07,607 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:47:07,607 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:47:07,608 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:47:07,608 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:47:07,609 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:47:07,610 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:47:07,611 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 16:47:07,638 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:47:07,638 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:47:07,638 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:47:07,639 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:47:07,639 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:47:07,640 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:47:07,640 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:47:07,640 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:47:07,640 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:47:07,640 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:47:07,641 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:47:07,641 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:47:07,642 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:47:07,642 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:47:07,642 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:47:07,642 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:47:07,643 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:47:07,643 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:47:07,643 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:47:07,643 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 16:47:07,644 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 16:47:07,644 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 16:47:07,644 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:47:07,644 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:47:07,645 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:47:07,645 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:47:07,645 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:47:07,645 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 16:47:07,646 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:47:07,646 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:47:07,646 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:47:07,646 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:47:07,647 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:47:07,647 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 16:47:07,647 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:07,647 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:47:07,648 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:47:07,648 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:47:07,648 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fa5ccf392f2d1c985715fbaacafc407291d4df2053e62d51fc1d2a5c2311799c [2021-11-23 16:47:08,020 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:47:08,043 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:47:08,046 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:47:08,047 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:47:08,048 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:47:08,050 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/eca-rers2012/Problem15_label15.c [2021-11-23 16:47:08,131 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/data/aa1840e2c/225feaf5816742e4bf391bdc6f004eeb/FLAG30dc38dbe [2021-11-23 16:47:09,040 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:47:09,041 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/sv-benchmarks/c/eca-rers2012/Problem15_label15.c [2021-11-23 16:47:09,073 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/data/aa1840e2c/225feaf5816742e4bf391bdc6f004eeb/FLAG30dc38dbe [2021-11-23 16:47:09,142 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/data/aa1840e2c/225feaf5816742e4bf391bdc6f004eeb [2021-11-23 16:47:09,144 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:47:09,146 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:47:09,149 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:47:09,149 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:47:09,153 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:47:09,154 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:47:09" (1/1) ... [2021-11-23 16:47:09,156 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@13737b11 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:09, skipping insertion in model container [2021-11-23 16:47:09,157 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:47:09" (1/1) ... [2021-11-23 16:47:09,164 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:47:09,268 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:47:09,514 WARN L230 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_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/sv-benchmarks/c/eca-rers2012/Problem15_label15.c[2445,2458] [2021-11-23 16:47:10,310 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:47:10,324 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:47:10,376 WARN L230 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_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/sv-benchmarks/c/eca-rers2012/Problem15_label15.c[2445,2458] [2021-11-23 16:47:10,768 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:47:10,786 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:47:10,786 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:10 WrapperNode [2021-11-23 16:47:10,786 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:47:10,788 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:47:10,788 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:47:10,788 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:47:10,795 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:10" (1/1) ... [2021-11-23 16:47:10,849 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:10" (1/1) ... [2021-11-23 16:47:10,993 INFO L137 Inliner]: procedures = 15, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 1755 [2021-11-23 16:47:10,994 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:47:10,995 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:47:10,995 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:47:10,995 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:47:11,004 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:10" (1/1) ... [2021-11-23 16:47:11,004 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:10" (1/1) ... [2021-11-23 16:47:11,015 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:10" (1/1) ... [2021-11-23 16:47:11,017 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:10" (1/1) ... [2021-11-23 16:47:11,082 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:10" (1/1) ... [2021-11-23 16:47:11,114 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:10" (1/1) ... [2021-11-23 16:47:11,126 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:10" (1/1) ... [2021-11-23 16:47:11,141 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:47:11,144 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:47:11,145 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:47:11,145 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:47:11,146 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:10" (1/1) ... [2021-11-23 16:47:11,157 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:47:11,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:11,182 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:47:11,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:47:11,225 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:47:11,226 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 16:47:11,226 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:47:11,226 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:47:11,297 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:47:11,298 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:47:30,610 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:47:30,630 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 16:47:30,630 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 16:47:30,634 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:47:30 BoogieIcfgContainer [2021-11-23 16:47:30,634 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 16:47:30,637 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 16:47:30,637 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 16:47:30,640 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 16:47:30,641 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 04:47:09" (1/3) ... [2021-11-23 16:47:30,642 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79d442c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:47:30, skipping insertion in model container [2021-11-23 16:47:30,642 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:10" (2/3) ... [2021-11-23 16:47:30,643 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79d442c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:47:30, skipping insertion in model container [2021-11-23 16:47:30,643 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:47:30" (3/3) ... [2021-11-23 16:47:30,645 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem15_label15.c [2021-11-23 16:47:30,651 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 16:47:30,652 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 16:47:30,706 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 16:47:30,714 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 16:47:30,714 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 16:47:30,750 INFO L276 IsEmpty]: Start isEmpty. Operand has 424 states, 422 states have (on average 1.7772511848341233) internal successors, (750), 423 states have internal predecessors, (750), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:30,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 16:47:30,757 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:30,757 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:30,758 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:30,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:30,764 INFO L85 PathProgramCache]: Analyzing trace with hash 406614337, now seen corresponding path program 1 times [2021-11-23 16:47:30,779 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:30,779 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [443838787] [2021-11-23 16:47:30,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:30,781 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:30,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:30,782 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:30,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 16:47:30,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:30,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:47:30,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:31,114 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:31,114 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:31,115 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:31,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [443838787] [2021-11-23 16:47:31,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [443838787] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:31,117 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:31,117 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:47:31,119 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037613181] [2021-11-23 16:47:31,133 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:31,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:47:31,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:31,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:47:31,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:47:31,208 INFO L87 Difference]: Start difference. First operand has 424 states, 422 states have (on average 1.7772511848341233) internal successors, (750), 423 states have internal predecessors, (750), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 2 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:54,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:54,322 INFO L93 Difference]: Finished difference Result 1155 states and 2106 transitions. [2021-11-23 16:47:54,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:47:54,324 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 2 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-23 16:47:54,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:54,343 INFO L225 Difference]: With dead ends: 1155 [2021-11-23 16:47:54,343 INFO L226 Difference]: Without dead ends: 667 [2021-11-23 16:47:54,348 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:47:54,352 INFO L933 BasicCegarLoop]: 329 mSDtfsCounter, 325 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 899 mSolverCounterSat, 345 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 325 SdHoareTripleChecker+Valid, 371 SdHoareTripleChecker+Invalid, 1244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 345 IncrementalHoareTripleChecker+Valid, 899 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:54,354 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [325 Valid, 371 Invalid, 1244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [345 Valid, 899 Invalid, 0 Unknown, 0 Unchecked, 23.0s Time] [2021-11-23 16:47:54,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 667 states. [2021-11-23 16:47:54,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 667 to 665. [2021-11-23 16:47:54,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 665 states, 664 states have (on average 1.4789156626506024) internal successors, (982), 664 states have internal predecessors, (982), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:54,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 665 states to 665 states and 982 transitions. [2021-11-23 16:47:54,458 INFO L78 Accepts]: Start accepts. Automaton has 665 states and 982 transitions. Word has length 19 [2021-11-23 16:47:54,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:54,458 INFO L470 AbstractCegarLoop]: Abstraction has 665 states and 982 transitions. [2021-11-23 16:47:54,459 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 2 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:54,459 INFO L276 IsEmpty]: Start isEmpty. Operand 665 states and 982 transitions. [2021-11-23 16:47:54,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 16:47:54,463 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:54,464 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:54,479 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:54,675 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:54,675 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:54,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:54,676 INFO L85 PathProgramCache]: Analyzing trace with hash -196995449, now seen corresponding path program 1 times [2021-11-23 16:47:54,678 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:54,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1898971006] [2021-11-23 16:47:54,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:54,679 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:54,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:54,680 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:54,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 16:47:54,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:54,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:47:54,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:55,245 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:55,246 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:55,246 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:55,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1898971006] [2021-11-23 16:47:55,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1898971006] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:55,247 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:55,248 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:47:55,251 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100896668] [2021-11-23 16:47:55,257 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:55,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:47:55,262 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:55,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:47:55,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:47:55,265 INFO L87 Difference]: Start difference. First operand 665 states and 982 transitions. Second operand has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 2 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:22,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:22,372 INFO L93 Difference]: Finished difference Result 1930 states and 2856 transitions. [2021-11-23 16:48:22,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:48:22,389 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 2 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2021-11-23 16:48:22,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:22,398 INFO L225 Difference]: With dead ends: 1930 [2021-11-23 16:48:22,399 INFO L226 Difference]: Without dead ends: 1267 [2021-11-23 16:48:22,400 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:48:22,402 INFO L933 BasicCegarLoop]: 320 mSDtfsCounter, 239 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 970 mSolverCounterSat, 180 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 22.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 1150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 180 IncrementalHoareTripleChecker+Valid, 970 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:22,403 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [239 Valid, 366 Invalid, 1150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [180 Valid, 970 Invalid, 0 Unknown, 0 Unchecked, 27.0s Time] [2021-11-23 16:48:22,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1267 states. [2021-11-23 16:48:22,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1267 to 1265. [2021-11-23 16:48:22,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1265 states, 1264 states have (on average 1.3045886075949367) internal successors, (1649), 1264 states have internal predecessors, (1649), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:22,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1265 states to 1265 states and 1649 transitions. [2021-11-23 16:48:22,461 INFO L78 Accepts]: Start accepts. Automaton has 1265 states and 1649 transitions. Word has length 94 [2021-11-23 16:48:22,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:22,461 INFO L470 AbstractCegarLoop]: Abstraction has 1265 states and 1649 transitions. [2021-11-23 16:48:22,462 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 2 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:22,462 INFO L276 IsEmpty]: Start isEmpty. Operand 1265 states and 1649 transitions. [2021-11-23 16:48:22,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2021-11-23 16:48:22,473 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:22,473 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:48:22,487 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:22,683 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:48:22,684 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:22,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:22,685 INFO L85 PathProgramCache]: Analyzing trace with hash -1519275246, now seen corresponding path program 1 times [2021-11-23 16:48:22,687 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:22,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [380623780] [2021-11-23 16:48:22,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:22,688 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:22,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:22,689 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:22,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 16:48:22,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:22,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:48:22,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:25,602 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 75 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:25,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:28,490 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 75 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:28,490 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:28,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [380623780] [2021-11-23 16:48:28,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [380623780] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:28,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [114043048] [2021-11-23 16:48:28,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:28,492 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:28,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:28,497 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:28,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2021-11-23 16:48:28,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:28,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:48:28,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:31,304 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 99 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 16:48:31,304 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:48:31,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [114043048] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:48:31,304 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:48:31,305 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3] total 11 [2021-11-23 16:48:31,305 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359887331] [2021-11-23 16:48:31,305 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:48:31,306 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 16:48:31,306 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:31,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 16:48:31,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=66, Unknown=0, NotChecked=0, Total=110 [2021-11-23 16:48:31,307 INFO L87 Difference]: Start difference. First operand 1265 states and 1649 transitions. Second operand has 7 states, 7 states have (on average 25.428571428571427) internal successors, (178), 7 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:41,796 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:49:02,559 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:49:17,691 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:49:19,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:19,109 INFO L93 Difference]: Finished difference Result 2633 states and 3623 transitions. [2021-11-23 16:49:19,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:49:19,128 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 25.428571428571427) internal successors, (178), 7 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 185 [2021-11-23 16:49:19,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:19,143 INFO L225 Difference]: With dead ends: 2633 [2021-11-23 16:49:19,143 INFO L226 Difference]: Without dead ends: 1970 [2021-11-23 16:49:19,145 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 552 GetRequests, 543 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=44, Invalid=66, Unknown=0, NotChecked=0, Total=110 [2021-11-23 16:49:19,147 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 1364 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 1523 mSolverCounterSat, 721 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 43.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1364 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 2244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 721 IncrementalHoareTripleChecker+Valid, 1523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 47.7s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:19,147 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1364 Valid, 115 Invalid, 2244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [721 Valid, 1523 Invalid, 0 Unknown, 0 Unchecked, 47.7s Time] [2021-11-23 16:49:19,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1970 states. [2021-11-23 16:49:19,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1970 to 1870. [2021-11-23 16:49:19,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1870 states, 1869 states have (on average 1.3242375601926164) internal successors, (2475), 1869 states have internal predecessors, (2475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:19,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1870 states to 1870 states and 2475 transitions. [2021-11-23 16:49:19,209 INFO L78 Accepts]: Start accepts. Automaton has 1870 states and 2475 transitions. Word has length 185 [2021-11-23 16:49:19,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:19,211 INFO L470 AbstractCegarLoop]: Abstraction has 1870 states and 2475 transitions. [2021-11-23 16:49:19,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 25.428571428571427) internal successors, (178), 7 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:19,211 INFO L276 IsEmpty]: Start isEmpty. Operand 1870 states and 2475 transitions. [2021-11-23 16:49:19,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2021-11-23 16:49:19,217 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:19,217 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:49:19,225 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (5)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:19,432 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:19,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:49:19,625 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:19,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:19,626 INFO L85 PathProgramCache]: Analyzing trace with hash -2142997860, now seen corresponding path program 1 times [2021-11-23 16:49:19,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:19,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [283333832] [2021-11-23 16:49:19,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:19,628 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:19,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:19,629 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:19,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 16:49:19,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:19,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:49:19,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:22,644 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 79 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:22,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:25,127 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 79 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:25,128 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:25,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [283333832] [2021-11-23 16:49:25,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [283333832] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:25,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [899973371] [2021-11-23 16:49:25,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:25,128 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:25,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:25,130 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:25,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-23 16:49:25,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:25,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:49:25,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:25,848 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 111 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:25,849 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:49:25,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [899973371] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:49:25,849 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:49:25,849 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2021-11-23 16:49:25,849 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180210628] [2021-11-23 16:49:25,850 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:49:25,850 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:49:25,850 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:25,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:49:25,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:49:25,851 INFO L87 Difference]: Start difference. First operand 1870 states and 2475 transitions. Second operand has 3 states, 3 states have (on average 63.0) internal successors, (189), 3 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:45,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:45,991 INFO L93 Difference]: Finished difference Result 3736 states and 5168 transitions. [2021-11-23 16:49:46,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:49:46,000 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 63.0) internal successors, (189), 3 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 189 [2021-11-23 16:49:46,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:46,015 INFO L225 Difference]: With dead ends: 3736 [2021-11-23 16:49:46,015 INFO L226 Difference]: Without dead ends: 2468 [2021-11-23 16:49:46,017 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 564 GetRequests, 559 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:49:46,018 INFO L933 BasicCegarLoop]: 268 mSDtfsCounter, 269 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 744 mSolverCounterSat, 344 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 269 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 1088 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 344 IncrementalHoareTripleChecker+Valid, 744 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 20.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:46,019 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [269 Valid, 333 Invalid, 1088 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [344 Valid, 744 Invalid, 0 Unknown, 0 Unchecked, 20.1s Time] [2021-11-23 16:49:46,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2468 states. [2021-11-23 16:49:46,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2468 to 2468. [2021-11-23 16:49:46,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2468 states, 2467 states have (on average 1.272800972841508) internal successors, (3140), 2467 states have internal predecessors, (3140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:46,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2468 states to 2468 states and 3140 transitions. [2021-11-23 16:49:46,086 INFO L78 Accepts]: Start accepts. Automaton has 2468 states and 3140 transitions. Word has length 189 [2021-11-23 16:49:46,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:46,086 INFO L470 AbstractCegarLoop]: Abstraction has 2468 states and 3140 transitions. [2021-11-23 16:49:46,087 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 63.0) internal successors, (189), 3 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:46,087 INFO L276 IsEmpty]: Start isEmpty. Operand 2468 states and 3140 transitions. [2021-11-23 16:49:46,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2021-11-23 16:49:46,092 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:46,093 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:46,110 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:46,311 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:46,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:46,507 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:46,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:46,508 INFO L85 PathProgramCache]: Analyzing trace with hash 321098277, now seen corresponding path program 1 times [2021-11-23 16:49:46,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:46,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [639498978] [2021-11-23 16:49:46,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:46,511 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:46,511 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:46,515 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:46,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 16:49:46,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:46,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:49:46,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:49,173 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 91 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:49,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:51,629 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 91 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:51,629 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:51,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [639498978] [2021-11-23 16:49:51,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [639498978] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:51,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2085720593] [2021-11-23 16:49:51,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:51,630 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:51,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:51,631 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:51,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-11-23 16:49:51,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:51,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:49:51,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:53,879 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 67 proven. 17 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 16:49:53,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:54,381 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 33 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 16:49:54,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2085720593] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 16:49:54,382 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 16:49:54,382 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3, 7] total 12 [2021-11-23 16:49:54,382 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496599035] [2021-11-23 16:49:54,382 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:49:54,383 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:49:54,383 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:54,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:49:54,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2021-11-23 16:49:54,385 INFO L87 Difference]: Start difference. First operand 2468 states and 3140 transitions. Second operand has 3 states, 3 states have (on average 72.33333333333333) internal successors, (217), 3 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:08,148 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:12,848 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.27s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:32,760 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.74s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:40,836 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.10s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:43,867 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.27s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:46,679 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.09s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:47,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:47,262 INFO L93 Difference]: Finished difference Result 3971 states and 5166 transitions. [2021-11-23 16:50:47,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:50:47,279 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 72.33333333333333) internal successors, (217), 3 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 306 [2021-11-23 16:50:47,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:47,299 INFO L225 Difference]: With dead ends: 3971 [2021-11-23 16:50:47,300 INFO L226 Difference]: Without dead ends: 3969 [2021-11-23 16:50:47,301 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1220 GetRequests, 1210 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2021-11-23 16:50:47,302 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 375 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 994 mSolverCounterSat, 236 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 49.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 375 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 1230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 236 IncrementalHoareTripleChecker+Valid, 994 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 52.8s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:47,302 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [375 Valid, 71 Invalid, 1230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [236 Valid, 994 Invalid, 0 Unknown, 0 Unchecked, 52.8s Time] [2021-11-23 16:50:47,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3969 states. [2021-11-23 16:50:47,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3969 to 2467. [2021-11-23 16:50:47,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2467 states, 2466 states have (on average 1.362530413625304) internal successors, (3360), 2466 states have internal predecessors, (3360), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:47,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2467 states to 2467 states and 3360 transitions. [2021-11-23 16:50:47,374 INFO L78 Accepts]: Start accepts. Automaton has 2467 states and 3360 transitions. Word has length 306 [2021-11-23 16:50:47,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:47,375 INFO L470 AbstractCegarLoop]: Abstraction has 2467 states and 3360 transitions. [2021-11-23 16:50:47,376 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 72.33333333333333) internal successors, (217), 3 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:47,376 INFO L276 IsEmpty]: Start isEmpty. Operand 2467 states and 3360 transitions. [2021-11-23 16:50:47,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 322 [2021-11-23 16:50:47,381 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:47,382 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:50:47,388 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:47,600 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:47,792 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:47,792 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:47,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:47,793 INFO L85 PathProgramCache]: Analyzing trace with hash 1404996678, now seen corresponding path program 1 times [2021-11-23 16:50:47,795 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:47,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1460383364] [2021-11-23 16:50:47,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:47,796 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:47,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:47,796 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:47,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 16:50:47,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:47,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:50:47,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:49,650 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 121 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 16:50:49,650 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:49,650 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:49,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1460383364] [2021-11-23 16:50:49,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1460383364] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:49,651 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:49,651 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:50:49,651 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018731534] [2021-11-23 16:50:49,651 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:49,652 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:50:49,652 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:49,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:50:49,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:50:49,653 INFO L87 Difference]: Start difference. First operand 2467 states and 3360 transitions. Second operand has 3 states, 3 states have (on average 101.66666666666667) internal successors, (305), 2 states have internal predecessors, (305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:06,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:06,376 INFO L93 Difference]: Finished difference Result 5231 states and 7029 transitions. [2021-11-23 16:51:06,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:51:06,394 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 101.66666666666667) internal successors, (305), 2 states have internal predecessors, (305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 321 [2021-11-23 16:51:06,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:06,410 INFO L225 Difference]: With dead ends: 5231 [2021-11-23 16:51:06,410 INFO L226 Difference]: Without dead ends: 2766 [2021-11-23 16:51:06,413 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 319 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:06,414 INFO L933 BasicCegarLoop]: 323 mSDtfsCounter, 105 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 887 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 892 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 887 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 16.7s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:06,415 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 358 Invalid, 892 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 887 Invalid, 0 Unknown, 0 Unchecked, 16.7s Time] [2021-11-23 16:51:06,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2766 states. [2021-11-23 16:51:06,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2766 to 2766. [2021-11-23 16:51:06,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2766 states, 2765 states have (on average 1.3254972875226039) internal successors, (3665), 2765 states have internal predecessors, (3665), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:06,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2766 states to 2766 states and 3665 transitions. [2021-11-23 16:51:06,480 INFO L78 Accepts]: Start accepts. Automaton has 2766 states and 3665 transitions. Word has length 321 [2021-11-23 16:51:06,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:06,481 INFO L470 AbstractCegarLoop]: Abstraction has 2766 states and 3665 transitions. [2021-11-23 16:51:06,481 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 101.66666666666667) internal successors, (305), 2 states have internal predecessors, (305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:06,482 INFO L276 IsEmpty]: Start isEmpty. Operand 2766 states and 3665 transitions. [2021-11-23 16:51:06,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 396 [2021-11-23 16:51:06,489 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:06,490 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:06,504 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:06,703 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:06,704 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:06,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:06,704 INFO L85 PathProgramCache]: Analyzing trace with hash 1973847668, now seen corresponding path program 1 times [2021-11-23 16:51:06,707 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:06,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1673882411] [2021-11-23 16:51:06,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:06,708 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:06,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:06,709 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:06,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 16:51:06,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:06,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:51:06,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:07,693 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 138 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:07,693 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:07,693 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:07,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1673882411] [2021-11-23 16:51:07,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1673882411] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:07,693 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:07,694 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:51:07,694 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148683268] [2021-11-23 16:51:07,694 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:07,695 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:51:07,695 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:07,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:51:07,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:07,695 INFO L87 Difference]: Start difference. First operand 2766 states and 3665 transitions. Second operand has 3 states, 3 states have (on average 131.66666666666666) internal successors, (395), 3 states have internal predecessors, (395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:30,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:30,987 INFO L93 Difference]: Finished difference Result 6437 states and 8757 transitions. [2021-11-23 16:51:31,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:51:31,010 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 131.66666666666666) internal successors, (395), 3 states have internal predecessors, (395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 395 [2021-11-23 16:51:31,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:31,030 INFO L225 Difference]: With dead ends: 6437 [2021-11-23 16:51:31,031 INFO L226 Difference]: Without dead ends: 3972 [2021-11-23 16:51:31,034 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 393 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:31,035 INFO L933 BasicCegarLoop]: 623 mSDtfsCounter, 212 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 945 mSolverCounterSat, 218 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 662 SdHoareTripleChecker+Invalid, 1163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 218 IncrementalHoareTripleChecker+Valid, 945 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:31,035 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [212 Valid, 662 Invalid, 1163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [218 Valid, 945 Invalid, 0 Unknown, 0 Unchecked, 23.2s Time] [2021-11-23 16:51:31,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3972 states. [2021-11-23 16:51:31,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3972 to 3670. [2021-11-23 16:51:31,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3670 states, 3669 states have (on average 1.2804578904333606) internal successors, (4698), 3669 states have internal predecessors, (4698), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:31,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3670 states to 3670 states and 4698 transitions. [2021-11-23 16:51:31,121 INFO L78 Accepts]: Start accepts. Automaton has 3670 states and 4698 transitions. Word has length 395 [2021-11-23 16:51:31,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:31,122 INFO L470 AbstractCegarLoop]: Abstraction has 3670 states and 4698 transitions. [2021-11-23 16:51:31,122 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 131.66666666666666) internal successors, (395), 3 states have internal predecessors, (395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:31,123 INFO L276 IsEmpty]: Start isEmpty. Operand 3670 states and 4698 transitions. [2021-11-23 16:51:31,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 413 [2021-11-23 16:51:31,132 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:31,133 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:31,150 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:31,346 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:31,347 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:31,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:31,348 INFO L85 PathProgramCache]: Analyzing trace with hash 1334285275, now seen corresponding path program 1 times [2021-11-23 16:51:31,350 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:31,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1462965038] [2021-11-23 16:51:31,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:31,350 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:31,350 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:31,351 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:31,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 16:51:31,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:31,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:51:31,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:33,736 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 214 proven. 32 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 16:51:33,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:35,715 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 214 proven. 32 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 16:51:35,715 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:35,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1462965038] [2021-11-23 16:51:35,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1462965038] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:35,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [987681767] [2021-11-23 16:51:35,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:35,716 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:51:35,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:51:35,717 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:51:35,718 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-23 16:51:35,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:35,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:51:35,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:36,712 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 229 proven. 9 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-11-23 16:51:36,712 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:37,452 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 229 proven. 9 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-11-23 16:51:37,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [987681767] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:37,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [674511712] [2021-11-23 16:51:37,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:37,453 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:51:37,454 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:51:37,455 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:51:37,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 16:51:37,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:37,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:51:37,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:38,396 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 229 proven. 9 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-11-23 16:51:38,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:39,138 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 229 proven. 9 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-11-23 16:51:39,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [674511712] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:39,139 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:51:39,140 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 4, 4, 4, 4] total 8 [2021-11-23 16:51:39,140 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74509089] [2021-11-23 16:51:39,140 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:51:39,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 16:51:39,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:39,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 16:51:39,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-23 16:51:39,144 INFO L87 Difference]: Start difference. First operand 3670 states and 4698 transitions. Second operand has 8 states, 8 states have (on average 95.5) internal successors, (764), 8 states have internal predecessors, (764), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:29,984 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:52:51,099 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.71s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:05,058 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.03s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:27,750 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:45,695 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:55,766 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.41s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:54:21,229 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.94s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:54:34,595 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:54:40,592 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:54:42,314 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.27s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:55:00,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:00,462 INFO L93 Difference]: Finished difference Result 12866 states and 16344 transitions. [2021-11-23 16:55:00,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 16:55:00,482 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 95.5) internal successors, (764), 8 states have internal predecessors, (764), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 412 [2021-11-23 16:55:00,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:00,526 INFO L225 Difference]: With dead ends: 12866 [2021-11-23 16:55:00,526 INFO L226 Difference]: Without dead ends: 9397 [2021-11-23 16:55:00,533 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2476 GetRequests, 2465 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2021-11-23 16:55:00,534 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 1888 mSDsluCounter, 214 mSDsCounter, 0 mSdLazyCounter, 5213 mSolverCounterSat, 1128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 192.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1888 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 6341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1128 IncrementalHoareTripleChecker+Valid, 5213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 200.9s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:00,534 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1888 Valid, 271 Invalid, 6341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1128 Valid, 5213 Invalid, 0 Unknown, 0 Unchecked, 200.9s Time] [2021-11-23 16:55:00,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9397 states. [2021-11-23 16:55:00,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9397 to 5764. [2021-11-23 16:55:00,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5764 states, 5763 states have (on average 1.1735207357279196) internal successors, (6763), 5763 states have internal predecessors, (6763), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:00,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5764 states to 5764 states and 6763 transitions. [2021-11-23 16:55:00,737 INFO L78 Accepts]: Start accepts. Automaton has 5764 states and 6763 transitions. Word has length 412 [2021-11-23 16:55:00,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:00,738 INFO L470 AbstractCegarLoop]: Abstraction has 5764 states and 6763 transitions. [2021-11-23 16:55:00,738 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 95.5) internal successors, (764), 8 states have internal predecessors, (764), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:00,738 INFO L276 IsEmpty]: Start isEmpty. Operand 5764 states and 6763 transitions. [2021-11-23 16:55:00,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 600 [2021-11-23 16:55:00,748 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:00,749 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:00,759 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:00,964 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Ended with exit code 0 [2021-11-23 16:55:01,180 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:01,351 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:01,351 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:01,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:01,352 INFO L85 PathProgramCache]: Analyzing trace with hash 1696321779, now seen corresponding path program 1 times [2021-11-23 16:55:01,355 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:01,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1381350827] [2021-11-23 16:55:01,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:01,355 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:01,356 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:01,356 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:01,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 16:55:01,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:01,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 670 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:55:01,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:03,973 INFO L134 CoverageAnalysis]: Checked inductivity of 637 backedges. 418 proven. 106 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2021-11-23 16:55:03,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:15,941 INFO L134 CoverageAnalysis]: Checked inductivity of 637 backedges. 418 proven. 106 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2021-11-23 16:55:15,942 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:15,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1381350827] [2021-11-23 16:55:15,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1381350827] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:15,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [984579654] [2021-11-23 16:55:15,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:15,943 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:15,943 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:15,958 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:15,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-23 16:55:16,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:16,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 670 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:55:16,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:17,161 INFO L134 CoverageAnalysis]: Checked inductivity of 637 backedges. 303 proven. 0 refuted. 0 times theorem prover too weak. 334 trivial. 0 not checked. [2021-11-23 16:55:17,162 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:55:17,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [984579654] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:55:17,162 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:55:17,163 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2021-11-23 16:55:17,163 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755515566] [2021-11-23 16:55:17,163 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:55:17,164 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:55:17,164 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:17,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:55:17,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:55:17,165 INFO L87 Difference]: Start difference. First operand 5764 states and 6763 transitions. Second operand has 3 states, 3 states have (on average 124.33333333333333) internal successors, (373), 3 states have internal predecessors, (373), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:37,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:37,791 INFO L93 Difference]: Finished difference Result 13324 states and 16008 transitions. [2021-11-23 16:55:37,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:55:37,819 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 124.33333333333333) internal successors, (373), 3 states have internal predecessors, (373), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 599 [2021-11-23 16:55:37,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:37,845 INFO L225 Difference]: With dead ends: 13324 [2021-11-23 16:55:37,845 INFO L226 Difference]: Without dead ends: 7861 [2021-11-23 16:55:37,875 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1794 GetRequests, 1789 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:55:37,876 INFO L933 BasicCegarLoop]: 548 mSDtfsCounter, 248 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 846 mSolverCounterSat, 192 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 586 SdHoareTripleChecker+Invalid, 1038 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 192 IncrementalHoareTripleChecker+Valid, 846 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 20.5s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:37,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [248 Valid, 586 Invalid, 1038 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [192 Valid, 846 Invalid, 0 Unknown, 0 Unchecked, 20.5s Time] [2021-11-23 16:55:37,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7861 states. [2021-11-23 16:55:38,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7861 to 7861. [2021-11-23 16:55:38,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7861 states, 7860 states have (on average 1.1516539440203561) internal successors, (9052), 7860 states have internal predecessors, (9052), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:38,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7861 states to 7861 states and 9052 transitions. [2021-11-23 16:55:38,045 INFO L78 Accepts]: Start accepts. Automaton has 7861 states and 9052 transitions. Word has length 599 [2021-11-23 16:55:38,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:38,046 INFO L470 AbstractCegarLoop]: Abstraction has 7861 states and 9052 transitions. [2021-11-23 16:55:38,047 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 124.33333333333333) internal successors, (373), 3 states have internal predecessors, (373), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:38,047 INFO L276 IsEmpty]: Start isEmpty. Operand 7861 states and 9052 transitions. [2021-11-23 16:55:38,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 616 [2021-11-23 16:55:38,056 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:38,057 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:38,068 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:38,284 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Ended with exit code 0 [2021-11-23 16:55:38,468 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:55:38,468 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:38,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:38,469 INFO L85 PathProgramCache]: Analyzing trace with hash 939886335, now seen corresponding path program 1 times [2021-11-23 16:55:38,475 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:38,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1142351144] [2021-11-23 16:55:38,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:38,476 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:38,476 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:38,477 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:38,509 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 16:55:38,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:38,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 684 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:55:38,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:41,318 INFO L134 CoverageAnalysis]: Checked inductivity of 679 backedges. 446 proven. 106 refuted. 0 times theorem prover too weak. 127 trivial. 0 not checked. [2021-11-23 16:55:41,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:55,046 INFO L134 CoverageAnalysis]: Checked inductivity of 679 backedges. 446 proven. 106 refuted. 0 times theorem prover too weak. 127 trivial. 0 not checked. [2021-11-23 16:55:55,047 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:55,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1142351144] [2021-11-23 16:55:55,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1142351144] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:55,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1059838406] [2021-11-23 16:55:55,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:55,047 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:55,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:55,048 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:55,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-11-23 16:55:55,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:55,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 684 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:55:55,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:56,787 INFO L134 CoverageAnalysis]: Checked inductivity of 679 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2021-11-23 16:55:56,788 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:55:56,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1059838406] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:55:56,788 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:55:56,789 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [3, 3] total 9 [2021-11-23 16:55:56,789 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231587205] [2021-11-23 16:55:56,789 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:55:56,790 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:55:56,790 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:56,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:55:56,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-11-23 16:55:56,791 INFO L87 Difference]: Start difference. First operand 7861 states and 9052 transitions. Second operand has 5 states, 5 states have (on average 59.4) internal successors, (297), 5 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:05,825 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:56:17,412 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.68s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:56:38,795 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:56:55,202 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.39s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:00,109 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:03,704 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.99s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:05,320 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.62s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:14,367 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.32s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:17,944 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:29,660 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:59,291 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 16:58:00,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:58:00,335 INFO L93 Difference]: Finished difference Result 23822 states and 27218 transitions. [2021-11-23 16:58:00,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:58:00,354 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 59.4) internal successors, (297), 5 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 615 [2021-11-23 16:58:00,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:58:00,380 INFO L225 Difference]: With dead ends: 23822 [2021-11-23 16:58:00,381 INFO L226 Difference]: Without dead ends: 13258 [2021-11-23 16:58:00,390 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1846 GetRequests, 1837 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2021-11-23 16:58:00,391 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 1545 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 2444 mSolverCounterSat, 654 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 116.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1545 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 3102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 654 IncrementalHoareTripleChecker+Valid, 2444 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 123.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:58:00,392 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1545 Valid, 124 Invalid, 3102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [654 Valid, 2444 Invalid, 4 Unknown, 0 Unchecked, 123.2s Time] [2021-11-23 16:58:00,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13258 states. [2021-11-23 16:58:00,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13258 to 10251. [2021-11-23 16:58:00,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10251 states, 10250 states have (on average 1.1276097560975609) internal successors, (11558), 10250 states have internal predecessors, (11558), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:00,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10251 states to 10251 states and 11558 transitions. [2021-11-23 16:58:00,871 INFO L78 Accepts]: Start accepts. Automaton has 10251 states and 11558 transitions. Word has length 615 [2021-11-23 16:58:00,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:58:00,873 INFO L470 AbstractCegarLoop]: Abstraction has 10251 states and 11558 transitions. [2021-11-23 16:58:00,873 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 59.4) internal successors, (297), 5 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:00,873 INFO L276 IsEmpty]: Start isEmpty. Operand 10251 states and 11558 transitions. [2021-11-23 16:58:00,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 621 [2021-11-23 16:58:00,896 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:58:00,897 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:58:00,905 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:01,112 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:01,298 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:58:01,298 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:58:01,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:58:01,299 INFO L85 PathProgramCache]: Analyzing trace with hash 1022212484, now seen corresponding path program 1 times [2021-11-23 16:58:01,304 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:58:01,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [322288926] [2021-11-23 16:58:01,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:01,304 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:58:01,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:58:01,305 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:58:01,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 16:58:01,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:01,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 678 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:58:01,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:04,393 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 363 proven. 106 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 16:58:04,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:17,894 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 363 proven. 106 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 16:58:17,894 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:58:17,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [322288926] [2021-11-23 16:58:17,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [322288926] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:17,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1094314356] [2021-11-23 16:58:17,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:17,896 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:58:17,896 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:58:17,897 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:58:17,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-11-23 16:58:18,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:18,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 678 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:58:18,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:21,231 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 363 proven. 106 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 16:58:21,231 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:34,309 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 363 proven. 106 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 16:58:34,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1094314356] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:34,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918245480] [2021-11-23 16:58:34,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:34,310 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:58:34,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:58:34,311 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:58:34,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 16:58:34,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:34,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 678 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:58:34,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:36,992 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 50 proven. 330 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2021-11-23 16:58:36,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:38,813 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 380 proven. 0 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2021-11-23 16:58:38,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1918245480] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 16:58:38,813 INFO L186 FreeRefinementEngine]: Found 1 perfect and 5 imperfect interpolant sequences. [2021-11-23 16:58:38,815 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3, 3, 3, 3] total 9 [2021-11-23 16:58:38,815 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461192706] [2021-11-23 16:58:38,815 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:58:38,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:58:38,816 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:58:38,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:58:38,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 16:58:38,818 INFO L87 Difference]: Start difference. First operand 10251 states and 11558 transitions. Second operand has 3 states, 3 states have (on average 171.66666666666666) internal successors, (515), 3 states have internal predecessors, (515), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:08,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:08,954 INFO L93 Difference]: Finished difference Result 24089 states and 27081 transitions. [2021-11-23 16:59:08,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:59:08,972 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 171.66666666666666) internal successors, (515), 3 states have internal predecessors, (515), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 620 [2021-11-23 16:59:08,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:09,005 INFO L225 Difference]: With dead ends: 24089 [2021-11-23 16:59:09,006 INFO L226 Difference]: Without dead ends: 14139 [2021-11-23 16:59:09,016 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3714 GetRequests, 3707 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 16:59:09,017 INFO L933 BasicCegarLoop]: 175 mSDtfsCounter, 125 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 892 mSolverCounterSat, 137 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 27.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 1029 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 137 IncrementalHoareTripleChecker+Valid, 892 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 30.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:09,018 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 204 Invalid, 1029 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [137 Valid, 892 Invalid, 0 Unknown, 0 Unchecked, 30.0s Time] [2021-11-23 16:59:09,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14139 states. [2021-11-23 16:59:09,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14139 to 10548. [2021-11-23 16:59:09,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10548 states, 10547 states have (on average 1.101450649473784) internal successors, (11617), 10547 states have internal predecessors, (11617), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:09,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10548 states to 10548 states and 11617 transitions. [2021-11-23 16:59:09,330 INFO L78 Accepts]: Start accepts. Automaton has 10548 states and 11617 transitions. Word has length 620 [2021-11-23 16:59:09,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:09,331 INFO L470 AbstractCegarLoop]: Abstraction has 10548 states and 11617 transitions. [2021-11-23 16:59:09,332 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 171.66666666666666) internal successors, (515), 3 states have internal predecessors, (515), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:09,332 INFO L276 IsEmpty]: Start isEmpty. Operand 10548 states and 11617 transitions. [2021-11-23 16:59:09,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 634 [2021-11-23 16:59:09,341 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:09,345 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:09,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:09,581 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:09,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:09,951 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:09,951 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:09,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:09,951 INFO L85 PathProgramCache]: Analyzing trace with hash -2064535459, now seen corresponding path program 1 times [2021-11-23 16:59:09,955 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:09,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [678827231] [2021-11-23 16:59:09,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:09,955 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:09,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:09,957 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:09,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 16:59:10,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:10,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 701 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:59:10,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:13,212 INFO L134 CoverageAnalysis]: Checked inductivity of 639 backedges. 341 proven. 188 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-11-23 16:59:13,213 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:27,607 INFO L134 CoverageAnalysis]: Checked inductivity of 639 backedges. 341 proven. 188 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-11-23 16:59:27,607 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:27,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [678827231] [2021-11-23 16:59:27,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [678827231] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:27,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1608364817] [2021-11-23 16:59:27,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:27,608 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:27,608 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:59:27,609 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:59:27,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-23 16:59:27,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:27,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 701 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:59:27,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:28,909 INFO L134 CoverageAnalysis]: Checked inductivity of 639 backedges. 300 proven. 0 refuted. 0 times theorem prover too weak. 339 trivial. 0 not checked. [2021-11-23 16:59:28,909 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:28,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1608364817] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:28,909 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:59:28,910 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2021-11-23 16:59:28,910 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480038315] [2021-11-23 16:59:28,910 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:28,910 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:59:28,910 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:28,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:59:28,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:59:28,911 INFO L87 Difference]: Start difference. First operand 10548 states and 11617 transitions. Second operand has 3 states, 3 states have (on average 123.66666666666667) internal successors, (371), 3 states have internal predecessors, (371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:46,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:46,704 INFO L93 Difference]: Finished difference Result 20792 states and 22926 transitions. [2021-11-23 16:59:46,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:59:46,710 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 123.66666666666667) internal successors, (371), 3 states have internal predecessors, (371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 633 [2021-11-23 16:59:46,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:46,729 INFO L225 Difference]: With dead ends: 20792 [2021-11-23 16:59:46,729 INFO L226 Difference]: Without dead ends: 10545 [2021-11-23 16:59:46,737 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1896 GetRequests, 1891 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:59:46,738 INFO L933 BasicCegarLoop]: 516 mSDtfsCounter, 244 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 805 mSolverCounterSat, 155 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 244 SdHoareTripleChecker+Valid, 550 SdHoareTripleChecker+Invalid, 960 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 155 IncrementalHoareTripleChecker+Valid, 805 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.7s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:46,739 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [244 Valid, 550 Invalid, 960 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [155 Valid, 805 Invalid, 0 Unknown, 0 Unchecked, 17.7s Time] [2021-11-23 16:59:46,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10545 states. [2021-11-23 16:59:46,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10545 to 9947. [2021-11-23 16:59:46,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9947 states, 9946 states have (on average 1.0673637643273677) internal successors, (10616), 9946 states have internal predecessors, (10616), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:47,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9947 states to 9947 states and 10616 transitions. [2021-11-23 16:59:47,003 INFO L78 Accepts]: Start accepts. Automaton has 9947 states and 10616 transitions. Word has length 633 [2021-11-23 16:59:47,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:47,004 INFO L470 AbstractCegarLoop]: Abstraction has 9947 states and 10616 transitions. [2021-11-23 16:59:47,005 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 123.66666666666667) internal successors, (371), 3 states have internal predecessors, (371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:47,005 INFO L276 IsEmpty]: Start isEmpty. Operand 9947 states and 10616 transitions. [2021-11-23 16:59:47,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 687 [2021-11-23 16:59:47,026 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:47,027 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:47,051 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:47,248 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (23)] Ended with exit code 0 [2021-11-23 16:59:47,446 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:47,447 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:47,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:47,448 INFO L85 PathProgramCache]: Analyzing trace with hash 1671996252, now seen corresponding path program 1 times [2021-11-23 16:59:47,452 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:47,453 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1697572064] [2021-11-23 16:59:47,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:47,453 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:47,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:47,454 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:47,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fe7af9a-f471-4bee-b0ff-10e5bb5167ae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 16:59:47,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:47,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 753 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:59:47,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:50,328 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 286 proven. 434 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 16:59:50,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:51,932 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 525 proven. 0 refuted. 0 times theorem prover too weak. 212 trivial. 0 not checked. [2021-11-23 16:59:51,932 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:51,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1697572064] [2021-11-23 16:59:51,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1697572064] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 16:59:51,932 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 16:59:51,932 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2021-11-23 16:59:51,933 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356561836] [2021-11-23 16:59:51,933 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:51,933 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:59:51,933 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:51,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:59:51,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:59:51,934 INFO L87 Difference]: Start difference. First operand 9947 states and 10616 transitions. Second operand has 3 states, 3 states have (on average 158.66666666666666) internal successors, (476), 3 states have internal predecessors, (476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:01,696 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.76s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:00:18,074 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers []