./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-tiling/mbpr2.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_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/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_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-tiling/mbpr2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/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_8db57794-9c81-445d-a9d0-63d6977404b3/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 a98ea70d5d9f752732070144a56514c68e9571f139726211e2f0ade721d6c5f3 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:39:20,280 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:39:20,284 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:39:20,353 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:39:20,354 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:39:20,359 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:39:20,362 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:39:20,366 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:39:20,370 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:39:20,379 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:39:20,381 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:39:20,383 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:39:20,384 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:39:20,388 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:39:20,392 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:39:20,400 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:39:20,402 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:39:20,404 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:39:20,407 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:39:20,417 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:39:20,419 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:39:20,422 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:39:20,426 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:39:20,427 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:39:20,442 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:39:20,442 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:39:20,443 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:39:20,446 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:39:20,446 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:39:20,448 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:39:20,449 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:39:20,450 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:39:20,452 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:39:20,454 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:39:20,456 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:39:20,457 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:39:20,457 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:39:20,458 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:39:20,458 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:39:20,459 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:39:20,460 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:39:20,461 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:39:20,518 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:39:20,519 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:39:20,520 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:39:20,520 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:39:20,521 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:39:20,521 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:39:20,522 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:39:20,522 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:39:20,522 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:39:20,523 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:39:20,524 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:39:20,524 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:39:20,525 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:39:20,525 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:39:20,525 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:39:20,526 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:39:20,526 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:39:20,526 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:39:20,527 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:39:20,528 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:39:20,528 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:39:20,528 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:39:20,529 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:39:20,529 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:39:20,529 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:39:20,529 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:39:20,530 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:39:20,530 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:39:20,530 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:39:20,531 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:39:20,531 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:39:20,532 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:39:20,532 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:39:20,532 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:39:20,533 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:39:20,533 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:39:20,533 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:39:20,534 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:39:20,534 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:39:20,534 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:39:20,534 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:39:20,535 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_8db57794-9c81-445d-a9d0-63d6977404b3/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a98ea70d5d9f752732070144a56514c68e9571f139726211e2f0ade721d6c5f3 [2021-11-23 17:39:20,906 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:39:20,946 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:39:20,950 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:39:20,951 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:39:20,952 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:39:20,954 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/array-tiling/mbpr2.c [2021-11-23 17:39:21,069 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/data/2330825ea/8985a5e9e5474b3b9fa46648c3ff1daa/FLAG563da2eda [2021-11-23 17:39:21,678 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:39:21,679 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/sv-benchmarks/c/array-tiling/mbpr2.c [2021-11-23 17:39:21,696 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/data/2330825ea/8985a5e9e5474b3b9fa46648c3ff1daa/FLAG563da2eda [2021-11-23 17:39:22,044 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/data/2330825ea/8985a5e9e5474b3b9fa46648c3ff1daa [2021-11-23 17:39:22,047 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:39:22,049 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:39:22,055 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:39:22,055 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:39:22,059 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:39:22,060 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:39:22" (1/1) ... [2021-11-23 17:39:22,063 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@48cc9db6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:22, skipping insertion in model container [2021-11-23 17:39:22,065 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:39:22" (1/1) ... [2021-11-23 17:39:22,080 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:39:22,107 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:39:22,342 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_8db57794-9c81-445d-a9d0-63d6977404b3/sv-benchmarks/c/array-tiling/mbpr2.c[396,409] [2021-11-23 17:39:22,364 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:39:22,372 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:39:22,386 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_8db57794-9c81-445d-a9d0-63d6977404b3/sv-benchmarks/c/array-tiling/mbpr2.c[396,409] [2021-11-23 17:39:22,398 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:39:22,411 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:39:22,412 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:22 WrapperNode [2021-11-23 17:39:22,412 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:39:22,413 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:39:22,414 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:39:22,414 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:39:22,422 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:22" (1/1) ... [2021-11-23 17:39:22,429 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:22" (1/1) ... [2021-11-23 17:39:22,463 INFO L137 Inliner]: procedures = 15, calls = 22, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 83 [2021-11-23 17:39:22,464 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:39:22,465 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:39:22,465 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:39:22,465 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:39:22,476 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:22" (1/1) ... [2021-11-23 17:39:22,476 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:22" (1/1) ... [2021-11-23 17:39:22,484 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:22" (1/1) ... [2021-11-23 17:39:22,484 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:22" (1/1) ... [2021-11-23 17:39:22,503 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:22" (1/1) ... [2021-11-23 17:39:22,508 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:22" (1/1) ... [2021-11-23 17:39:22,515 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:22" (1/1) ... [2021-11-23 17:39:22,518 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:39:22,521 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:39:22,522 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:39:22,522 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:39:22,523 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:22" (1/1) ... [2021-11-23 17:39:22,532 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:39:22,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:22,557 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:39:22,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:39:22,602 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:39:22,602 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:39:22,602 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 17:39:22,602 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 17:39:22,602 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:39:22,602 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:39:22,602 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 17:39:22,603 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 17:39:22,709 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:39:22,711 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:39:22,981 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:39:23,028 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 17:39:23,034 INFO L158 Benchmark]: Toolchain (without parser) took 983.06ms. Allocated memory was 79.7MB in the beginning and 96.5MB in the end (delta: 16.8MB). Free memory was 42.8MB in the beginning and 57.0MB in the end (delta: -14.2MB). Peak memory consumption was 1.7MB. Max. memory is 16.1GB. [2021-11-23 17:39:23,034 INFO L158 Benchmark]: CDTParser took 0.36ms. Allocated memory is still 79.7MB. Free memory is still 59.0MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:39:23,036 INFO L158 Benchmark]: CACSL2BoogieTranslator took 358.08ms. Allocated memory was 79.7MB in the beginning and 96.5MB in the end (delta: 16.8MB). Free memory was 42.6MB in the beginning and 72.0MB in the end (delta: -29.4MB). Peak memory consumption was 5.6MB. Max. memory is 16.1GB. [2021-11-23 17:39:23,038 INFO L158 Benchmark]: Boogie Procedure Inliner took 50.46ms. Allocated memory is still 96.5MB. Free memory was 71.9MB in the beginning and 70.1MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 17:39:23,039 INFO L158 Benchmark]: Boogie Preprocessor took 54.15ms. Allocated memory is still 96.5MB. Free memory was 70.1MB in the beginning and 68.8MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 17:39:23,054 INFO L158 Benchmark]: RCFGBuilder took 509.77ms. Allocated memory is still 96.5MB. Free memory was 68.8MB in the beginning and 57.0MB in the end (delta: 11.8MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2021-11-23 17:39:23,059 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.36ms. Allocated memory is still 79.7MB. Free memory is still 59.0MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 358.08ms. Allocated memory was 79.7MB in the beginning and 96.5MB in the end (delta: 16.8MB). Free memory was 42.6MB in the beginning and 72.0MB in the end (delta: -29.4MB). Peak memory consumption was 5.6MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 50.46ms. Allocated memory is still 96.5MB. Free memory was 71.9MB in the beginning and 70.1MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 54.15ms. Allocated memory is still 96.5MB. Free memory was 70.1MB in the beginning and 68.8MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 509.77ms. Allocated memory is still 96.5MB. Free memory was 68.8MB in the beginning and 57.0MB in the end (delta: 11.8MB). Peak memory consumption was 12.6MB. 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 17:39:23,189 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/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_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/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_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-tiling/mbpr2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/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_8db57794-9c81-445d-a9d0-63d6977404b3/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 a98ea70d5d9f752732070144a56514c68e9571f139726211e2f0ade721d6c5f3 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:39:26,172 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:39:26,177 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:39:26,217 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:39:26,218 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:39:26,220 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:39:26,222 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:39:26,225 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:39:26,228 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:39:26,230 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:39:26,232 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:39:26,234 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:39:26,235 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:39:26,236 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:39:26,238 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:39:26,241 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:39:26,242 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:39:26,243 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:39:26,247 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:39:26,250 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:39:26,253 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:39:26,260 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:39:26,265 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:39:26,267 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:39:26,279 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:39:26,285 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:39:26,286 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:39:26,291 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:39:26,294 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:39:26,295 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:39:26,297 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:39:26,298 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:39:26,300 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:39:26,302 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:39:26,304 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:39:26,304 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:39:26,306 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:39:26,306 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:39:26,306 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:39:26,309 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:39:26,310 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:39:26,316 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:39:26,378 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:39:26,379 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:39:26,380 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:39:26,380 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:39:26,381 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:39:26,381 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:39:26,382 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:39:26,382 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:39:26,382 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:39:26,383 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:39:26,384 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:39:26,384 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:39:26,386 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:39:26,386 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:39:26,387 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:39:26,387 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:39:26,387 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:39:26,387 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:39:26,388 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:39:26,388 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:39:26,388 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:39:26,388 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:39:26,389 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:39:26,389 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:39:26,389 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:39:26,390 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:39:26,390 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:39:26,390 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:39:26,391 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:39:26,391 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:39:26,391 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:39:26,392 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:39:26,392 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:39:26,392 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:39:26,393 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:26,393 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:39:26,393 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:39:26,394 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:39:26,394 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_8db57794-9c81-445d-a9d0-63d6977404b3/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a98ea70d5d9f752732070144a56514c68e9571f139726211e2f0ade721d6c5f3 [2021-11-23 17:39:26,817 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:39:26,861 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:39:26,865 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:39:26,866 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:39:26,867 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:39:26,869 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/array-tiling/mbpr2.c [2021-11-23 17:39:26,961 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/data/23015248d/264e8b38f4d841bf97e307c7d04932ee/FLAG553a3c199 [2021-11-23 17:39:27,633 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:39:27,636 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/sv-benchmarks/c/array-tiling/mbpr2.c [2021-11-23 17:39:27,644 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/data/23015248d/264e8b38f4d841bf97e307c7d04932ee/FLAG553a3c199 [2021-11-23 17:39:27,960 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/data/23015248d/264e8b38f4d841bf97e307c7d04932ee [2021-11-23 17:39:27,967 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:39:27,970 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:39:27,973 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:39:27,973 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:39:27,978 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:39:27,980 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:39:27" (1/1) ... [2021-11-23 17:39:27,983 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6a38fd02 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:27, skipping insertion in model container [2021-11-23 17:39:27,984 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:39:27" (1/1) ... [2021-11-23 17:39:27,994 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:39:28,019 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:39:28,253 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_8db57794-9c81-445d-a9d0-63d6977404b3/sv-benchmarks/c/array-tiling/mbpr2.c[396,409] [2021-11-23 17:39:28,302 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:39:28,317 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:39:28,378 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_8db57794-9c81-445d-a9d0-63d6977404b3/sv-benchmarks/c/array-tiling/mbpr2.c[396,409] [2021-11-23 17:39:28,428 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:39:28,450 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:39:28,450 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:28 WrapperNode [2021-11-23 17:39:28,450 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:39:28,452 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:39:28,452 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:39:28,452 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:39:28,461 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:28" (1/1) ... [2021-11-23 17:39:28,486 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:28" (1/1) ... [2021-11-23 17:39:28,528 INFO L137 Inliner]: procedures = 17, calls = 22, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 82 [2021-11-23 17:39:28,528 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:39:28,529 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:39:28,529 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:39:28,529 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:39:28,541 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:28" (1/1) ... [2021-11-23 17:39:28,542 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:28" (1/1) ... [2021-11-23 17:39:28,552 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:28" (1/1) ... [2021-11-23 17:39:28,553 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:28" (1/1) ... [2021-11-23 17:39:28,575 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:28" (1/1) ... [2021-11-23 17:39:28,580 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:28" (1/1) ... [2021-11-23 17:39:28,582 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:28" (1/1) ... [2021-11-23 17:39:28,587 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:39:28,590 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:39:28,591 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:39:28,591 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:39:28,592 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:28" (1/1) ... [2021-11-23 17:39:28,601 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:39:28,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:28,632 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:39:28,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:39:28,700 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:39:28,700 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:39:28,700 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 17:39:28,701 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-23 17:39:28,701 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:39:28,701 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:39:28,701 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-23 17:39:28,702 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 17:39:28,813 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:39:28,816 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:39:29,182 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:39:29,190 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:39:29,190 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-23 17:39:29,192 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:39:29 BoogieIcfgContainer [2021-11-23 17:39:29,192 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:39:29,195 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:39:29,195 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:39:29,198 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:39:29,199 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:39:27" (1/3) ... [2021-11-23 17:39:29,200 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9f610b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:39:29, skipping insertion in model container [2021-11-23 17:39:29,200 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:39:28" (2/3) ... [2021-11-23 17:39:29,200 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9f610b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:39:29, skipping insertion in model container [2021-11-23 17:39:29,201 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:39:29" (3/3) ... [2021-11-23 17:39:29,202 INFO L111 eAbstractionObserver]: Analyzing ICFG mbpr2.c [2021-11-23 17:39:29,208 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:39:29,225 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 17:39:29,326 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:39:29,334 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 17:39:29,334 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 17:39:29,349 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 27 states have (on average 1.5185185185185186) internal successors, (41), 28 states have internal predecessors, (41), 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 17:39:29,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 17:39:29,353 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:29,353 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:39:29,354 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:29,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:29,359 INFO L85 PathProgramCache]: Analyzing trace with hash -669443655, now seen corresponding path program 1 times [2021-11-23 17:39:29,373 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:29,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [638503709] [2021-11-23 17:39:29,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:29,375 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:29,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:29,379 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:29,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:39:29,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:29,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 17:39:29,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:29,615 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 17:39:29,616 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:39:29,617 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:29,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [638503709] [2021-11-23 17:39:29,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [638503709] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:39:29,619 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:39:29,620 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:39:29,623 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895419589] [2021-11-23 17:39:29,624 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:39:29,629 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 17:39:29,630 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:29,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 17:39:29,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 17:39:29,678 INFO L87 Difference]: Start difference. First operand has 29 states, 27 states have (on average 1.5185185185185186) internal successors, (41), 28 states have internal predecessors, (41), 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 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 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 17:39:29,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:29,707 INFO L93 Difference]: Finished difference Result 53 states and 74 transitions. [2021-11-23 17:39:29,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 17:39:29,709 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 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 15 [2021-11-23 17:39:29,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:29,720 INFO L225 Difference]: With dead ends: 53 [2021-11-23 17:39:29,721 INFO L226 Difference]: Without dead ends: 24 [2021-11-23 17:39:29,724 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 17:39:29,730 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:29,733 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:39:29,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-23 17:39:29,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-23 17:39:29,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 23 states have internal predecessors, (29), 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 17:39:29,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2021-11-23 17:39:29,777 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 15 [2021-11-23 17:39:29,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:29,778 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2021-11-23 17:39:29,779 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 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 17:39:29,779 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2021-11-23 17:39:29,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 17:39:29,781 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:29,781 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:39:29,794 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2021-11-23 17:39:29,994 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:39:29,994 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:29,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:29,999 INFO L85 PathProgramCache]: Analyzing trace with hash -893920799, now seen corresponding path program 1 times [2021-11-23 17:39:30,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:30,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [124691331] [2021-11-23 17:39:30,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:30,005 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:30,006 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:30,007 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:30,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:39:30,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:30,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:39:30,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:30,240 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 17:39:30,240 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:39:30,241 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:30,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [124691331] [2021-11-23 17:39:30,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [124691331] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:39:30,241 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:39:30,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:39:30,242 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728508708] [2021-11-23 17:39:30,242 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:39:30,243 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:39:30,244 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:30,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:39:30,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:39:30,245 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 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 17:39:30,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:30,505 INFO L93 Difference]: Finished difference Result 46 states and 58 transitions. [2021-11-23 17:39:30,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:39:30,507 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 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 15 [2021-11-23 17:39:30,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:30,508 INFO L225 Difference]: With dead ends: 46 [2021-11-23 17:39:30,508 INFO L226 Difference]: Without dead ends: 32 [2021-11-23 17:39:30,509 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:39:30,511 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 31 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:30,511 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 22 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 17:39:30,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-23 17:39:30,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 26. [2021-11-23 17:39:30,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 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 17:39:30,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2021-11-23 17:39:30,519 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 15 [2021-11-23 17:39:30,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:30,520 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2021-11-23 17:39:30,520 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 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 17:39:30,520 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2021-11-23 17:39:30,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 17:39:30,521 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:30,521 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:39:30,538 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:30,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:39:30,733 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:30,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:30,734 INFO L85 PathProgramCache]: Analyzing trace with hash -816010793, now seen corresponding path program 1 times [2021-11-23 17:39:30,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:30,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1392294108] [2021-11-23 17:39:30,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:30,735 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:30,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:30,736 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:30,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:39:30,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:30,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:39:30,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:31,003 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:39:31,003 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:39:31,004 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:31,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1392294108] [2021-11-23 17:39:31,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1392294108] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:39:31,005 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:39:31,006 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:39:31,008 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681498035] [2021-11-23 17:39:31,011 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:39:31,011 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:39:31,012 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:31,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:39:31,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:39:31,014 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 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 17:39:31,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:31,050 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2021-11-23 17:39:31,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:39:31,051 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 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 23 [2021-11-23 17:39:31,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:31,054 INFO L225 Difference]: With dead ends: 39 [2021-11-23 17:39:31,055 INFO L226 Difference]: Without dead ends: 26 [2021-11-23 17:39:31,055 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 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 17:39:31,058 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 15 mSDsluCounter, 1 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:31,065 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 25 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:39:31,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-23 17:39:31,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-23 17:39:31,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.2) internal successors, (30), 25 states have internal predecessors, (30), 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 17:39:31,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-11-23 17:39:31,079 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 23 [2021-11-23 17:39:31,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:31,080 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-11-23 17:39:31,080 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 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 17:39:31,082 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-11-23 17:39:31,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 17:39:31,083 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:31,083 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:39:31,105 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:31,298 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:39:31,298 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:31,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:31,299 INFO L85 PathProgramCache]: Analyzing trace with hash -1209037803, now seen corresponding path program 1 times [2021-11-23 17:39:31,300 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:31,300 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2134312234] [2021-11-23 17:39:31,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:31,300 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:31,300 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:31,301 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:31,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:39:31,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:31,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:39:31,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:31,471 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:39:31,472 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:39:31,472 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:31,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2134312234] [2021-11-23 17:39:31,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2134312234] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:39:31,473 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:39:31,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:39:31,474 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228819821] [2021-11-23 17:39:31,474 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:39:31,474 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:39:31,475 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:31,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:39:31,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:39:31,476 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 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 17:39:31,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:31,525 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-11-23 17:39:31,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:39:31,526 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 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 23 [2021-11-23 17:39:31,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:31,531 INFO L225 Difference]: With dead ends: 36 [2021-11-23 17:39:31,532 INFO L226 Difference]: Without dead ends: 34 [2021-11-23 17:39:31,535 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:39:31,540 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 8 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:31,541 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 76 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:39:31,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-23 17:39:31,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 28. [2021-11-23 17:39:31,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 27 states have internal predecessors, (32), 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 17:39:31,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2021-11-23 17:39:31,547 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 23 [2021-11-23 17:39:31,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:31,547 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2021-11-23 17:39:31,547 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 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 17:39:31,547 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2021-11-23 17:39:31,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 17:39:31,548 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:31,552 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:39:31,564 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:31,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:39:31,764 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:31,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:31,764 INFO L85 PathProgramCache]: Analyzing trace with hash -1208978221, now seen corresponding path program 1 times [2021-11-23 17:39:31,765 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:31,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [210422674] [2021-11-23 17:39:31,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:31,765 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:31,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:31,766 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:31,769 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:39:31,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:31,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:39:31,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:32,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 17:39:32,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:32,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-23 17:39:32,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:32,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-23 17:39:32,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2021-11-23 17:39:32,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2021-11-23 17:39:32,442 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:32,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:32,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-23 17:39:32,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 26 [2021-11-23 17:39:32,955 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:39:32,955 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:32,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [210422674] [2021-11-23 17:39:32,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [210422674] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:32,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1418936406] [2021-11-23 17:39:32,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:32,956 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:32,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:32,962 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:32,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-23 17:39:33,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:33,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:39:33,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:33,228 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 17:39:33,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:33,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-23 17:39:33,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:33,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-23 17:39:33,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2021-11-23 17:39:33,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2021-11-23 17:39:33,525 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:33,525 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:33,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-23 17:39:33,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 26 [2021-11-23 17:39:33,869 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:39:33,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1418936406] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:33,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1748227019] [2021-11-23 17:39:33,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:33,871 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:33,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:33,873 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:39:33,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 17:39:33,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:33,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:39:33,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:34,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 17:39:34,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:34,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-23 17:39:34,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:34,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-23 17:39:34,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2021-11-23 17:39:34,370 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2021-11-23 17:39:34,380 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:34,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:34,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-23 17:39:34,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 26 [2021-11-23 17:39:34,725 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:39:34,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1748227019] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:34,725 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:39:34,725 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 8, 7, 8, 7] total 12 [2021-11-23 17:39:34,726 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727454194] [2021-11-23 17:39:34,726 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:39:34,727 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 17:39:34,727 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:34,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 17:39:34,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-11-23 17:39:34,728 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 12 states have internal predecessors, (40), 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 17:39:35,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:35,414 INFO L93 Difference]: Finished difference Result 73 states and 84 transitions. [2021-11-23 17:39:35,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 17:39:35,415 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 12 states have internal predecessors, (40), 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 23 [2021-11-23 17:39:35,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:35,416 INFO L225 Difference]: With dead ends: 73 [2021-11-23 17:39:35,416 INFO L226 Difference]: Without dead ends: 52 [2021-11-23 17:39:35,417 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 110 SyntacticMatches, 12 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:39:35,418 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 93 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:35,419 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 69 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 17:39:35,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-23 17:39:35,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 30. [2021-11-23 17:39:35,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 29 states have internal predecessors, (33), 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 17:39:35,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2021-11-23 17:39:35,426 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 23 [2021-11-23 17:39:35,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:35,426 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2021-11-23 17:39:35,427 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 12 states have internal predecessors, (40), 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 17:39:35,427 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2021-11-23 17:39:35,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 17:39:35,428 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:35,428 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:39:35,446 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2021-11-23 17:39:35,630 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:35,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:36,029 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:36,029 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:36,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:36,030 INFO L85 PathProgramCache]: Analyzing trace with hash -1368311994, now seen corresponding path program 1 times [2021-11-23 17:39:36,030 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:36,031 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [302565715] [2021-11-23 17:39:36,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:36,031 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:36,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:36,032 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:36,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:39:36,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:36,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:39:36,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:36,240 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 17:39:36,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:36,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-23 17:39:36,520 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:39:36,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:36,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-11-23 17:39:36,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-23 17:39:36,888 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:39:36,888 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:36,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [302565715] [2021-11-23 17:39:36,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [302565715] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:36,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1541053104] [2021-11-23 17:39:36,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:36,890 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:36,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:36,891 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:36,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-11-23 17:39:37,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:37,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:39:37,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:37,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 17:39:37,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:37,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-23 17:39:37,349 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:39:37,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:37,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-11-23 17:39:37,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-23 17:39:37,551 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:39:37,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1541053104] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:37,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1292057503] [2021-11-23 17:39:37,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:37,552 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:37,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:37,557 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:39:37,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 17:39:37,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:37,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:39:37,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:37,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 17:39:37,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:37,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-23 17:39:37,952 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:39:37,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:38,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-11-23 17:39:38,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-23 17:39:38,157 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:39:38,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1292057503] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:38,158 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:39:38,158 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9, 8, 10, 8] total 15 [2021-11-23 17:39:38,158 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812192032] [2021-11-23 17:39:38,158 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:39:38,159 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-23 17:39:38,160 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:38,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-23 17:39:38,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-11-23 17:39:38,161 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand has 15 states, 15 states have (on average 3.8) internal successors, (57), 15 states have internal predecessors, (57), 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 17:39:38,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:38,936 INFO L93 Difference]: Finished difference Result 56 states and 61 transitions. [2021-11-23 17:39:38,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:39:38,937 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.8) internal successors, (57), 15 states have internal predecessors, (57), 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 29 [2021-11-23 17:39:38,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:38,938 INFO L225 Difference]: With dead ends: 56 [2021-11-23 17:39:38,938 INFO L226 Difference]: Without dead ends: 54 [2021-11-23 17:39:38,939 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 150 SyntacticMatches, 6 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=199, Invalid=557, Unknown=0, NotChecked=0, Total=756 [2021-11-23 17:39:38,940 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 170 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:38,940 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [170 Valid, 77 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 17:39:38,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-23 17:39:38,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 36. [2021-11-23 17:39:38,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 35 states have internal predecessors, (40), 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 17:39:38,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2021-11-23 17:39:38,948 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 29 [2021-11-23 17:39:38,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:38,948 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2021-11-23 17:39:38,949 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.8) internal successors, (57), 15 states have internal predecessors, (57), 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 17:39:38,949 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2021-11-23 17:39:38,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-23 17:39:38,950 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:38,950 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-11-23 17:39:38,957 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:39,179 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:39,374 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:39,565 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:39:39,565 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:39,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:39,566 INFO L85 PathProgramCache]: Analyzing trace with hash 21305209, now seen corresponding path program 2 times [2021-11-23 17:39:39,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:39,566 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1109909939] [2021-11-23 17:39:39,566 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:39:39,567 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:39,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:39,567 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:39,569 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 17:39:39,683 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:39:39,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:39:39,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:39:39,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:43,125 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:39:43,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:44,941 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:39:44,941 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:44,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1109909939] [2021-11-23 17:39:44,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1109909939] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:44,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [509700291] [2021-11-23 17:39:44,942 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:39:44,942 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:44,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:44,949 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:44,973 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-23 17:39:45,078 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:39:45,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:39:45,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:39:45,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:47,039 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:39:47,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:47,605 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:39:47,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [509700291] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:47,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [325011063] [2021-11-23 17:39:47,605 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:39:47,606 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:47,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:47,606 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:39:47,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 17:39:47,735 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:39:47,735 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:39:47,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:39:47,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:49,612 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:39:49,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:50,139 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:39:50,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [325011063] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:50,141 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:39:50,141 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 10, 9, 10, 9] total 17 [2021-11-23 17:39:50,141 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660665139] [2021-11-23 17:39:50,142 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:39:50,142 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 17:39:50,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:50,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 17:39:50,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=192, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:39:50,144 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand has 17 states, 17 states have (on average 3.764705882352941) internal successors, (64), 17 states have internal predecessors, (64), 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 17:39:52,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:52,575 INFO L93 Difference]: Finished difference Result 97 states and 108 transitions. [2021-11-23 17:39:52,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:39:52,580 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.764705882352941) internal successors, (64), 17 states have internal predecessors, (64), 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 35 [2021-11-23 17:39:52,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:52,581 INFO L225 Difference]: With dead ends: 97 [2021-11-23 17:39:52,581 INFO L226 Difference]: Without dead ends: 54 [2021-11-23 17:39:52,582 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 189 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=105, Invalid=237, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:39:52,583 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 136 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:52,583 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 95 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-23 17:39:52,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-23 17:39:52,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 44. [2021-11-23 17:39:52,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 43 states have internal predecessors, (48), 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 17:39:52,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2021-11-23 17:39:52,592 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 35 [2021-11-23 17:39:52,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:52,592 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2021-11-23 17:39:52,592 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.764705882352941) internal successors, (64), 17 states have internal predecessors, (64), 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 17:39:52,593 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2021-11-23 17:39:52,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 17:39:52,594 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:52,595 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-11-23 17:39:52,633 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:52,811 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:53,018 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:53,209 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:39:53,210 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:53,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:53,210 INFO L85 PathProgramCache]: Analyzing trace with hash 1279882925, now seen corresponding path program 3 times [2021-11-23 17:39:53,211 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:53,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [894490626] [2021-11-23 17:39:53,211 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:39:53,211 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:53,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:53,214 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:53,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 17:39:53,346 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 17:39:53,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:39:53,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:39:53,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:53,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 17:39:53,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:53,585 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-23 17:39:53,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:53,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:39:53,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:53,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 17:39:53,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2021-11-23 17:39:53,939 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 10 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:39:53,939 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:54,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 24 [2021-11-23 17:39:54,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 92 treesize of output 88 [2021-11-23 17:39:55,042 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 10 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:39:55,042 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:55,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [894490626] [2021-11-23 17:39:55,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [894490626] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:55,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1840283122] [2021-11-23 17:39:55,043 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:39:55,043 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:55,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:55,044 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:55,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-23 17:39:55,248 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 17:39:55,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:39:55,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:39:55,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:55,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 17:39:55,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:55,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 17:39:55,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:55,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:39:55,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:55,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:39:55,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:55,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-23 17:39:55,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:55,922 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 17:39:55,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 25 [2021-11-23 17:39:56,519 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:56,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:57,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 31 [2021-11-23 17:39:57,943 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 59 [2021-11-23 17:39:58,782 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:39:58,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1840283122] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:58,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1750589103] [2021-11-23 17:39:58,782 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:39:58,783 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:58,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:58,785 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:39:58,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 17:39:58,967 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 17:39:58,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:39:58,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 17:39:58,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:59,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 17:39:59,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:59,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 17:39:59,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:59,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:39:59,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:59,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:39:59,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:39:59,375 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-23 17:39:59,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 13 [2021-11-23 17:39:59,712 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2021-11-23 17:39:59,721 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:59,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:01,305 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-11-23 17:40:01,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-23 17:40:01,650 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:40:01,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1750589103] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:01,651 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:40:01,651 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 13, 13, 10, 11] total 47 [2021-11-23 17:40:01,651 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218267483] [2021-11-23 17:40:01,651 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:40:01,652 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-23 17:40:01,653 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:40:01,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-23 17:40:01,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=1925, Unknown=0, NotChecked=0, Total=2162 [2021-11-23 17:40:01,655 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 47 states, 47 states have (on average 4.191489361702128) internal successors, (197), 47 states have internal predecessors, (197), 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 17:40:27,453 WARN L227 SmtUtils]: Spent 12.10s on a formula simplification. DAG size of input: 37 DAG size of output: 36 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 17:40:29,475 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 17:40:31,482 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 17:40:31,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:40:31,919 INFO L93 Difference]: Finished difference Result 126 states and 140 transitions. [2021-11-23 17:40:31,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-23 17:40:31,920 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 4.191489361702128) internal successors, (197), 47 states have internal predecessors, (197), 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 43 [2021-11-23 17:40:31,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:40:31,922 INFO L225 Difference]: With dead ends: 126 [2021-11-23 17:40:31,922 INFO L226 Difference]: Without dead ends: 116 [2021-11-23 17:40:31,927 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 201 SyntacticMatches, 18 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3092 ImplicationChecksByTransitivity, 29.2s TimeCoverageRelationStatistics Valid=968, Invalid=6864, Unknown=0, NotChecked=0, Total=7832 [2021-11-23 17:40:31,927 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 285 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 673 mSolverCounterSat, 159 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 285 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 1073 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 673 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 239 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:40:31,928 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [285 Valid, 317 Invalid, 1073 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 673 Invalid, 2 Unknown, 239 Unchecked, 5.5s Time] [2021-11-23 17:40:31,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-23 17:40:31,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 88. [2021-11-23 17:40:31,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 87 states have (on average 1.0804597701149425) internal successors, (94), 87 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 17:40:31,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 94 transitions. [2021-11-23 17:40:31,949 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 94 transitions. Word has length 43 [2021-11-23 17:40:31,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:40:31,949 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 94 transitions. [2021-11-23 17:40:31,950 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 4.191489361702128) internal successors, (197), 47 states have internal predecessors, (197), 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 17:40:31,950 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 94 transitions. [2021-11-23 17:40:31,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 17:40:31,953 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:40:31,953 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:40:32,002 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:32,184 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:32,371 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:32,569 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:40:32,569 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:40:32,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:40:32,570 INFO L85 PathProgramCache]: Analyzing trace with hash -984603497, now seen corresponding path program 4 times [2021-11-23 17:40:32,570 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:40:32,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1338471291] [2021-11-23 17:40:32,571 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:40:32,571 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:40:32,571 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:40:32,572 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:40:32,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 17:40:32,680 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:40:32,681 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:40:32,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:40:32,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:35,175 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 17:40:35,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:38,690 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 17:40:38,691 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:40:38,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1338471291] [2021-11-23 17:40:38,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1338471291] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:38,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1234867399] [2021-11-23 17:40:38,691 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:40:38,691 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:40:38,691 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:40:38,692 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:40:38,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-23 17:40:38,849 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:40:38,849 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:40:38,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:40:38,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:40,170 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 17:40:40,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:48,002 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 17:40:48,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1234867399] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:48,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007732303] [2021-11-23 17:40:48,002 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:40:48,002 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:40:48,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:40:48,003 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:40:48,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 17:40:48,128 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:40:48,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:40:48,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:40:48,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:49,155 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 17:40:49,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:50,172 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 17:40:50,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2007732303] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:50,173 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:40:50,173 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 11, 11, 11, 10] total 21 [2021-11-23 17:40:50,173 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308950617] [2021-11-23 17:40:50,174 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:40:50,174 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-23 17:40:50,175 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:40:50,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-23 17:40:50,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=308, Unknown=2, NotChecked=0, Total=420 [2021-11-23 17:40:50,176 INFO L87 Difference]: Start difference. First operand 88 states and 94 transitions. Second operand has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 21 states have internal predecessors, (66), 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 17:40:55,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:40:55,694 INFO L93 Difference]: Finished difference Result 161 states and 174 transitions. [2021-11-23 17:40:55,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 17:40:55,699 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 21 states have internal predecessors, (66), 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 53 [2021-11-23 17:40:55,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:40:55,700 INFO L225 Difference]: With dead ends: 161 [2021-11-23 17:40:55,700 INFO L226 Difference]: Without dead ends: 119 [2021-11-23 17:40:55,701 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 292 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=157, Invalid=441, Unknown=2, NotChecked=0, Total=600 [2021-11-23 17:40:55,702 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 194 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 40 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:40:55,703 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 98 Invalid, 380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 277 Invalid, 0 Unknown, 40 Unchecked, 3.1s Time] [2021-11-23 17:40:55,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-23 17:40:55,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 102. [2021-11-23 17:40:55,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 101 states have (on average 1.0792079207920793) internal successors, (109), 101 states have internal predecessors, (109), 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 17:40:55,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 109 transitions. [2021-11-23 17:40:55,721 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 109 transitions. Word has length 53 [2021-11-23 17:40:55,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:40:55,721 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 109 transitions. [2021-11-23 17:40:55,722 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 21 states have internal predecessors, (66), 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 17:40:55,722 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 109 transitions. [2021-11-23 17:40:55,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 17:40:55,724 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:40:55,724 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:40:55,738 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:55,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:56,154 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:56,327 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:40:56,327 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:40:56,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:40:56,328 INFO L85 PathProgramCache]: Analyzing trace with hash 1817606607, now seen corresponding path program 5 times [2021-11-23 17:40:56,328 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:40:56,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [32002248] [2021-11-23 17:40:56,328 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 17:40:56,329 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:40:56,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:40:56,330 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:40:56,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 17:40:56,496 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-23 17:40:56,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:40:56,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:40:56,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:02,522 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 12 proven. 46 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:41:02,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:07,407 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 12 proven. 46 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:41:07,407 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:41:07,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [32002248] [2021-11-23 17:41:07,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [32002248] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:07,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [553577259] [2021-11-23 17:41:07,408 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 17:41:07,408 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:07,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:41:07,410 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:41:07,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-23 17:41:08,099 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-23 17:41:08,099 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:41:08,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:41:08,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:11,583 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 12 proven. 51 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:41:11,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:12,750 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 12 proven. 46 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:41:12,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [553577259] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:12,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [715973980] [2021-11-23 17:41:12,750 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 17:41:12,751 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:12,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:41:12,752 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:41:12,753 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 17:41:13,176 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-23 17:41:13,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:41:13,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:41:13,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:18,251 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 12 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:18,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:21,340 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 17 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:21,341 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [715973980] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:21,341 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:41:21,341 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 14, 13, 16, 14] total 32 [2021-11-23 17:41:21,341 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124594409] [2021-11-23 17:41:21,341 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:41:21,342 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:41:21,342 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:41:21,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:41:21,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=731, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:41:21,344 INFO L87 Difference]: Start difference. First operand 102 states and 109 transitions. Second operand has 32 states, 32 states have (on average 3.875) internal successors, (124), 32 states have internal predecessors, (124), 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 17:41:27,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:41:27,131 INFO L93 Difference]: Finished difference Result 124 states and 132 transitions. [2021-11-23 17:41:27,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:41:27,136 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.875) internal successors, (124), 32 states have internal predecessors, (124), 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 55 [2021-11-23 17:41:27,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:41:27,137 INFO L225 Difference]: With dead ends: 124 [2021-11-23 17:41:27,137 INFO L226 Difference]: Without dead ends: 78 [2021-11-23 17:41:27,138 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 293 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 447 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=341, Invalid=919, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 17:41:27,139 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 266 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 468 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 573 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 468 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:41:27,139 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [266 Valid, 198 Invalid, 573 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 468 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2021-11-23 17:41:27,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-23 17:41:27,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 71. [2021-11-23 17:41:27,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.0857142857142856) internal successors, (76), 70 states have internal predecessors, (76), 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 17:41:27,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 76 transitions. [2021-11-23 17:41:27,150 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 76 transitions. Word has length 55 [2021-11-23 17:41:27,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:41:27,150 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 76 transitions. [2021-11-23 17:41:27,150 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 3.875) internal successors, (124), 32 states have internal predecessors, (124), 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 17:41:27,151 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 76 transitions. [2021-11-23 17:41:27,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-23 17:41:27,152 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:41:27,152 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:41:27,166 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Ended with exit code 0 [2021-11-23 17:41:27,368 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:27,601 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:27,766 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:27,767 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:41:27,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:41:27,767 INFO L85 PathProgramCache]: Analyzing trace with hash 399273106, now seen corresponding path program 6 times [2021-11-23 17:41:27,767 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:41:27,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [494049403] [2021-11-23 17:41:27,768 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:41:27,768 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:41:27,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:41:27,769 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:41:27,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:41:27,946 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-11-23 17:41:27,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:41:27,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:41:27,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:28,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 17:41:28,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:28,126 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-23 17:41:28,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:28,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:41:28,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:28,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 17:41:28,619 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:41:28,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:29,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 23 [2021-11-23 17:41:29,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 192 treesize of output 184 [2021-11-23 17:41:29,639 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:41:29,639 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:41:29,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [494049403] [2021-11-23 17:41:29,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [494049403] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:29,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1727585410] [2021-11-23 17:41:29,640 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:41:29,640 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:29,640 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:41:29,641 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:41:29,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-23 17:41:29,901 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-11-23 17:41:29,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:41:29,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 17:41:29,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:30,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 17:41:30,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:30,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-23 17:41:30,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:30,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:41:30,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:30,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:30,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:30,141 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 17:41:30,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 34 [2021-11-23 17:41:30,667 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:41:30,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:31,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 23 [2021-11-23 17:41:31,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 49 [2021-11-23 17:41:31,498 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 3 proven. 42 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:41:31,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1727585410] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:31,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [756524282] [2021-11-23 17:41:31,499 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:41:31,499 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:31,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:41:31,505 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:41:31,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-23 17:41:31,789 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-11-23 17:41:31,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:41:31,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:41:31,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:31,965 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 17:41:31,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:31,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-23 17:41:32,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:32,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:41:32,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:32,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:32,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:32,093 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 17:41:32,094 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 34 [2021-11-23 17:41:32,449 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:41:32,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:32,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 23 [2021-11-23 17:41:32,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 49 [2021-11-23 17:41:32,890 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 3 proven. 42 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:41:32,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [756524282] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:32,893 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:41:32,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 14, 13, 15, 13] total 32 [2021-11-23 17:41:32,894 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54326661] [2021-11-23 17:41:32,894 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:41:32,895 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:41:32,895 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:41:32,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:41:32,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=812, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:41:32,897 INFO L87 Difference]: Start difference. First operand 71 states and 76 transitions. Second operand has 32 states, 32 states have (on average 4.4375) internal successors, (142), 32 states have internal predecessors, (142), 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 17:41:36,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:41:36,363 INFO L93 Difference]: Finished difference Result 157 states and 172 transitions. [2021-11-23 17:41:36,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-23 17:41:36,364 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 4.4375) internal successors, (142), 32 states have internal predecessors, (142), 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 57 [2021-11-23 17:41:36,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:41:36,366 INFO L225 Difference]: With dead ends: 157 [2021-11-23 17:41:36,366 INFO L226 Difference]: Without dead ends: 155 [2021-11-23 17:41:36,368 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 303 SyntacticMatches, 12 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2049 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=838, Invalid=5168, Unknown=0, NotChecked=0, Total=6006 [2021-11-23 17:41:36,369 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 393 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 669 mSolverCounterSat, 142 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 393 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 917 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 142 IncrementalHoareTripleChecker+Valid, 669 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 106 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:41:36,370 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [393 Valid, 278 Invalid, 917 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [142 Valid, 669 Invalid, 0 Unknown, 106 Unchecked, 1.2s Time] [2021-11-23 17:41:36,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-11-23 17:41:36,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 97. [2021-11-23 17:41:36,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.1041666666666667) internal successors, (106), 96 states have internal predecessors, (106), 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 17:41:36,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 106 transitions. [2021-11-23 17:41:36,383 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 106 transitions. Word has length 57 [2021-11-23 17:41:36,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:41:36,383 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 106 transitions. [2021-11-23 17:41:36,384 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 4.4375) internal successors, (142), 32 states have internal predecessors, (142), 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 17:41:36,384 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 106 transitions. [2021-11-23 17:41:36,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:41:36,386 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:41:36,386 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:41:36,404 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:36,612 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:36,797 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:36,989 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:41:36,989 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:41:36,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:41:36,989 INFO L85 PathProgramCache]: Analyzing trace with hash 419308485, now seen corresponding path program 7 times [2021-11-23 17:41:36,990 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:41:36,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [728003190] [2021-11-23 17:41:36,990 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:41:36,990 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:41:36,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:41:36,992 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:41:36,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 17:41:37,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:37,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 17:41:37,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:37,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 17:41:37,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:37,383 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-23 17:41:37,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:37,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:41:37,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:37,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 17:41:37,896 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2021-11-23 17:41:37,927 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 26 proven. 48 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:41:37,927 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:39,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 24 [2021-11-23 17:41:39,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 208 treesize of output 200 [2021-11-23 17:41:39,377 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 26 proven. 39 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 17:41:39,377 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:41:39,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [728003190] [2021-11-23 17:41:39,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [728003190] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:39,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [166971604] [2021-11-23 17:41:39,377 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:41:39,377 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:39,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:41:39,378 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:41:39,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-23 17:41:39,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:39,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:41:39,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:39,923 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 17:41:39,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:39,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-23 17:41:40,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:40,005 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:41:40,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:40,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 17:41:40,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2021-11-23 17:41:40,356 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 26 proven. 53 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 17:41:40,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:41,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 24 [2021-11-23 17:41:41,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 208 treesize of output 200 [2021-11-23 17:41:41,254 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 26 proven. 39 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 17:41:41,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [166971604] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:41,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [913475770] [2021-11-23 17:41:41,254 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:41:41,255 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:41,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:41:41,256 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:41:41,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-23 17:41:41,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:41,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:41:41,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:41,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 17:41:41,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:41,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-23 17:41:41,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:41,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:41:41,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:41,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 17:41:42,048 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2021-11-23 17:41:42,064 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 26 proven. 53 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 17:41:42,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:42,807 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 24 [2021-11-23 17:41:42,809 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 92 treesize of output 88 [2021-11-23 17:41:42,905 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 26 proven. 39 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 17:41:42,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [913475770] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:42,906 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:41:42,906 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13, 11, 13, 11, 13] total 21 [2021-11-23 17:41:42,906 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719245193] [2021-11-23 17:41:42,906 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:41:42,907 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-23 17:41:42,907 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:41:42,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-23 17:41:42,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2021-11-23 17:41:42,909 INFO L87 Difference]: Start difference. First operand 97 states and 106 transitions. Second operand has 21 states, 21 states have (on average 5.0476190476190474) internal successors, (106), 21 states have internal predecessors, (106), 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 17:41:44,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:41:44,330 INFO L93 Difference]: Finished difference Result 177 states and 196 transitions. [2021-11-23 17:41:44,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 17:41:44,333 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 5.0476190476190474) internal successors, (106), 21 states have internal predecessors, (106), 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 63 [2021-11-23 17:41:44,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:41:44,334 INFO L225 Difference]: With dead ends: 177 [2021-11-23 17:41:44,335 INFO L226 Difference]: Without dead ends: 153 [2021-11-23 17:41:44,335 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 341 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 373 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=151, Invalid=719, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:41:44,336 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 136 mSDsluCounter, 305 mSDsCounter, 0 mSdLazyCounter, 400 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 331 SdHoareTripleChecker+Invalid, 477 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 400 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 40 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:41:44,337 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 331 Invalid, 477 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 400 Invalid, 0 Unknown, 40 Unchecked, 0.8s Time] [2021-11-23 17:41:44,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-11-23 17:41:44,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 122. [2021-11-23 17:41:44,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.0909090909090908) internal successors, (132), 121 states have internal predecessors, (132), 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 17:41:44,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 132 transitions. [2021-11-23 17:41:44,364 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 132 transitions. Word has length 63 [2021-11-23 17:41:44,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:41:44,365 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 132 transitions. [2021-11-23 17:41:44,366 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 5.0476190476190474) internal successors, (106), 21 states have internal predecessors, (106), 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 17:41:44,366 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 132 transitions. [2021-11-23 17:41:44,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:41:44,368 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:41:44,368 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:41:44,392 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:44,606 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:44,784 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (28)] Ended with exit code 0 [2021-11-23 17:41:44,982 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:44,983 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:41:44,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:41:44,983 INFO L85 PathProgramCache]: Analyzing trace with hash 26281475, now seen corresponding path program 8 times [2021-11-23 17:41:44,983 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:41:44,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [359010601] [2021-11-23 17:41:44,983 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:41:44,984 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:41:44,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:41:44,985 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:41:45,004 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-23 17:41:45,125 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:41:45,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:41:45,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:41:45,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:45,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 17:41:45,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:45,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 17:41:45,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:45,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:41:45,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:45,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:41:45,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:45,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:41:45,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:45,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:41:45,666 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:45,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-23 17:41:45,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 13 [2021-11-23 17:41:46,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2021-11-23 17:41:46,168 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 8 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:46,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:47,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-11-23 17:41:47,967 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-23 17:41:48,344 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 8 proven. 72 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:41:48,345 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:41:48,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [359010601] [2021-11-23 17:41:48,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [359010601] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:48,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [39574771] [2021-11-23 17:41:48,345 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:41:48,345 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:48,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:41:48,346 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:41:48,347 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-11-23 17:41:48,666 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:41:48,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:41:48,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:41:48,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:48,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 17:41:48,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:48,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 17:41:48,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:48,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:41:48,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:48,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:41:48,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:49,001 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:41:49,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:49,027 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:41:49,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:49,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-23 17:41:49,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 13 [2021-11-23 17:41:49,506 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2021-11-23 17:41:49,513 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 8 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:49,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:50,919 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-11-23 17:41:50,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-23 17:41:51,051 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 8 proven. 72 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:41:51,052 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [39574771] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:51,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1818025835] [2021-11-23 17:41:51,052 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:41:51,052 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:51,052 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:41:51,053 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:41:51,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-23 17:41:51,192 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:41:51,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:41:51,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-23 17:41:51,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:51,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 17:41:51,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:51,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 17:41:51,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:51,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:41:51,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:51,472 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 17:41:51,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 25 [2021-11-23 17:41:51,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:51,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:41:51,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:51,549 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 17:41:51,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 25 [2021-11-23 17:41:51,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:41:51,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-23 17:41:51,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 13 [2021-11-23 17:41:52,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2021-11-23 17:41:52,026 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 8 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:52,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:52,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-11-23 17:41:52,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-23 17:41:53,056 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 8 proven. 59 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:41:53,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1818025835] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:53,056 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:41:53,057 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 16, 13, 16, 13, 13] total 26 [2021-11-23 17:41:53,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959421284] [2021-11-23 17:41:53,057 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:41:53,058 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 17:41:53,058 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:41:53,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 17:41:53,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=556, Unknown=0, NotChecked=0, Total=650 [2021-11-23 17:41:53,059 INFO L87 Difference]: Start difference. First operand 122 states and 132 transitions. Second operand has 26 states, 26 states have (on average 4.615384615384615) internal successors, (120), 26 states have internal predecessors, (120), 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 17:41:55,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:41:55,699 INFO L93 Difference]: Finished difference Result 183 states and 199 transitions. [2021-11-23 17:41:55,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-23 17:41:55,700 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.615384615384615) internal successors, (120), 26 states have internal predecessors, (120), 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 63 [2021-11-23 17:41:55,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:41:55,701 INFO L225 Difference]: With dead ends: 183 [2021-11-23 17:41:55,701 INFO L226 Difference]: Without dead ends: 167 [2021-11-23 17:41:55,702 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 325 SyntacticMatches, 29 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 967 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=278, Invalid=1978, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:41:55,705 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 198 mSDsluCounter, 344 mSDsCounter, 0 mSdLazyCounter, 599 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 198 SdHoareTripleChecker+Valid, 376 SdHoareTripleChecker+Invalid, 824 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 599 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 142 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:41:55,705 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [198 Valid, 376 Invalid, 824 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 599 Invalid, 0 Unknown, 142 Unchecked, 1.2s Time] [2021-11-23 17:41:55,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-23 17:41:55,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 132. [2021-11-23 17:41:55,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 131 states have (on average 1.0763358778625953) internal successors, (141), 131 states have internal predecessors, (141), 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 17:41:55,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 141 transitions. [2021-11-23 17:41:55,722 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 141 transitions. Word has length 63 [2021-11-23 17:41:55,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:41:55,722 INFO L470 AbstractCegarLoop]: Abstraction has 132 states and 141 transitions. [2021-11-23 17:41:55,723 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.615384615384615) internal successors, (120), 26 states have internal predecessors, (120), 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 17:41:55,723 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 141 transitions. [2021-11-23 17:41:55,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-23 17:41:55,724 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:41:55,724 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:41:55,741 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (31)] Ended with exit code 0 [2021-11-23 17:41:55,941 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:56,155 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:56,328 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:56,329 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:41:56,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:41:56,329 INFO L85 PathProgramCache]: Analyzing trace with hash 744016241, now seen corresponding path program 9 times [2021-11-23 17:41:56,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:41:56,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1615775049] [2021-11-23 17:41:56,330 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:41:56,331 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:41:56,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:41:56,332 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:41:56,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-23 17:41:56,518 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 17:41:56,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:41:56,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:41:56,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:59,277 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 13 proven. 30 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2021-11-23 17:41:59,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:06,043 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2021-11-23 17:42:06,043 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:42:06,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1615775049] [2021-11-23 17:42:06,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1615775049] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:06,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1331157677] [2021-11-23 17:42:06,044 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:42:06,045 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:42:06,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:42:06,045 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:42:06,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-23 17:42:06,555 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 17:42:06,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:42:06,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:42:06,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:13,842 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 13 proven. 30 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2021-11-23 17:42:13,843 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:17,966 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2021-11-23 17:42:17,966 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1331157677] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:17,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1276009831] [2021-11-23 17:42:17,967 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:42:17,967 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:42:17,967 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:42:17,968 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:42:17,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-23 17:42:18,597 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 17:42:18,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:42:18,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:42:18,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:19,923 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 13 proven. 30 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2021-11-23 17:42:19,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:21,969 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2021-11-23 17:42:21,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1276009831] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:21,970 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:42:21,970 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 14, 14, 12, 13] total 37 [2021-11-23 17:42:21,970 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975956088] [2021-11-23 17:42:21,971 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:42:21,971 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-23 17:42:21,972 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:42:21,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-23 17:42:21,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=1021, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 17:42:21,973 INFO L87 Difference]: Start difference. First operand 132 states and 141 transitions. Second operand has 37 states, 37 states have (on average 3.2972972972972974) internal successors, (122), 37 states have internal predecessors, (122), 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 17:42:45,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:42:45,256 INFO L93 Difference]: Finished difference Result 313 states and 344 transitions. [2021-11-23 17:42:45,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-23 17:42:45,261 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.2972972972972974) internal successors, (122), 37 states have internal predecessors, (122), 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 73 [2021-11-23 17:42:45,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:42:45,264 INFO L225 Difference]: With dead ends: 313 [2021-11-23 17:42:45,264 INFO L226 Difference]: Without dead ends: 247 [2021-11-23 17:42:45,266 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 459 GetRequests, 397 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1185 ImplicationChecksByTransitivity, 30.1s TimeCoverageRelationStatistics Valid=915, Invalid=3117, Unknown=0, NotChecked=0, Total=4032 [2021-11-23 17:42:45,266 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 621 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 744 mSolverCounterSat, 237 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 621 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 981 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 237 IncrementalHoareTripleChecker+Valid, 744 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:42:45,267 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [621 Valid, 201 Invalid, 981 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [237 Valid, 744 Invalid, 0 Unknown, 0 Unchecked, 6.9s Time] [2021-11-23 17:42:45,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-11-23 17:42:45,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 184. [2021-11-23 17:42:45,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 183 states have (on average 1.0874316939890711) internal successors, (199), 183 states have internal predecessors, (199), 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 17:42:45,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 199 transitions. [2021-11-23 17:42:45,286 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 199 transitions. Word has length 73 [2021-11-23 17:42:45,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:42:45,286 INFO L470 AbstractCegarLoop]: Abstraction has 184 states and 199 transitions. [2021-11-23 17:42:45,287 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 3.2972972972972974) internal successors, (122), 37 states have internal predecessors, (122), 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 17:42:45,287 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 199 transitions. [2021-11-23 17:42:45,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 17:42:45,288 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:42:45,288 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:42:45,294 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (34)] Ended with exit code 0 [2021-11-23 17:42:45,516 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-23 17:42:45,700 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Ended with exit code 0 [2021-11-23 17:42:45,891 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:42:45,892 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:42:45,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:42:45,892 INFO L85 PathProgramCache]: Analyzing trace with hash -903520087, now seen corresponding path program 10 times [2021-11-23 17:42:45,893 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:42:45,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1087344559] [2021-11-23 17:42:45,893 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:42:45,893 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:42:45,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:42:45,894 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:42:45,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-23 17:42:46,034 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:42:46,034 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:42:46,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 17:42:46,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:55,805 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 18 proven. 111 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:42:55,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:03,744 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 18 proven. 111 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:43:03,744 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:43:03,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1087344559] [2021-11-23 17:43:03,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1087344559] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:03,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [792590571] [2021-11-23 17:43:03,745 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:43:03,745 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:43:03,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:43:03,746 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:43:03,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-11-23 17:43:03,982 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:43:03,982 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:43:03,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:43:03,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:15,125 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 18 proven. 111 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:43:15,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:19,293 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 18 proven. 111 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:43:19,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [792590571] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:19,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [436304465] [2021-11-23 17:43:19,295 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:43:19,295 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:19,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:43:19,297 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:43:19,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-23 17:43:19,467 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:43:19,467 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:43:19,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:43:19,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:24,357 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 18 proven. 111 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:43:24,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:25,368 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 18 proven. 111 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:43:25,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [436304465] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:25,369 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:43:25,369 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16, 16, 16, 16, 15] total 45 [2021-11-23 17:43:25,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106845473] [2021-11-23 17:43:25,369 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:43:25,370 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-23 17:43:25,370 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:43:25,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-23 17:43:25,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=474, Invalid=1506, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:43:25,371 INFO L87 Difference]: Start difference. First operand 184 states and 199 transitions. Second operand has 45 states, 45 states have (on average 4.288888888888889) internal successors, (193), 45 states have internal predecessors, (193), 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 17:43:33,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:43:33,617 INFO L93 Difference]: Finished difference Result 199 states and 215 transitions. [2021-11-23 17:43:33,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 17:43:33,621 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 4.288888888888889) internal successors, (193), 45 states have internal predecessors, (193), 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 75 [2021-11-23 17:43:33,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:43:33,622 INFO L225 Difference]: With dead ends: 199 [2021-11-23 17:43:33,622 INFO L226 Difference]: Without dead ends: 137 [2021-11-23 17:43:33,624 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 401 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 982 ImplicationChecksByTransitivity, 23.9s TimeCoverageRelationStatistics Valid=626, Invalid=1824, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 17:43:33,624 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 396 mSDsluCounter, 301 mSDsCounter, 0 mSdLazyCounter, 756 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 396 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 867 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 756 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:43:33,625 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [396 Valid, 332 Invalid, 867 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 756 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2021-11-23 17:43:33,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-11-23 17:43:33,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2021-11-23 17:43:33,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 136 states have (on average 1.088235294117647) internal successors, (148), 136 states have internal predecessors, (148), 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 17:43:33,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 148 transitions. [2021-11-23 17:43:33,639 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 148 transitions. Word has length 75 [2021-11-23 17:43:33,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:43:33,639 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 148 transitions. [2021-11-23 17:43:33,639 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 4.288888888888889) internal successors, (193), 45 states have internal predecessors, (193), 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 17:43:33,640 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 148 transitions. [2021-11-23 17:43:33,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 17:43:33,641 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:43:33,641 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:43:33,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:33,861 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Ended with exit code 0 [2021-11-23 17:43:34,055 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Ended with exit code 0 [2021-11-23 17:43:34,253 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:43:34,253 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:43:34,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:43:34,254 INFO L85 PathProgramCache]: Analyzing trace with hash 786712044, now seen corresponding path program 11 times [2021-11-23 17:43:34,254 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:43:34,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1722577825] [2021-11-23 17:43:34,254 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 17:43:34,254 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:43:34,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:43:34,255 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:43:34,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8db57794-9c81-445d-a9d0-63d6977404b3/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-23 17:43:34,732 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 17:43:34,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:43:34,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:43:34,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:34,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 17:43:34,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:43:34,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-23 17:43:34,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:43:34,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:43:34,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:43:34,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:43:34,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:43:34,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:43:34,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:43:34,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:43:35,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:43:35,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-23 17:43:35,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:43:35,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 17:43:35,425 INFO L354 Elim1Store]: treesize reduction 4, result has 60.0 percent of original size [2021-11-23 17:43:35,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 26 [2021-11-23 17:43:35,481 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 44 proven. 53 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 17:43:35,481 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:03,550 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_903 (_ BitVec 32)) (v_ArrVal_901 (_ BitVec 32)) (v_ArrVal_900 (_ BitVec 32)) (v_ArrVal_898 (_ BitVec 32)) (|v_ULTIMATE.start_main_~i~0#1_540| (_ BitVec 32))) (let ((.cse0 (let ((.cse2 (bvmul |c_ULTIMATE.start_main_~i~0#1| (_ bv8 32)))) (store (store (store (store (select |c_#memory_int| |c_ULTIMATE.start_main_~#volArray~0#1.base|) (bvadd (_ bv4294967292 32) |c_ULTIMATE.start_main_~#volArray~0#1.offset| .cse2) v_ArrVal_898) (bvadd |c_ULTIMATE.start_main_~#volArray~0#1.offset| (_ bv4294967288 32) .cse2) v_ArrVal_900) (bvadd (_ bv4 32) |c_ULTIMATE.start_main_~#volArray~0#1.offset| .cse2) v_ArrVal_901) (bvadd |c_ULTIMATE.start_main_~#volArray~0#1.offset| .cse2) v_ArrVal_903)))) (let ((.cse1 (select .cse0 (bvadd (bvmul |v_ULTIMATE.start_main_~i~0#1_540| (_ bv4 32)) |c_ULTIMATE.start_main_~#volArray~0#1.offset|)))) (or (bvsle (select .cse0 (bvadd (_ bv4 32) |c_ULTIMATE.start_main_~#volArray~0#1.offset|)) .cse1) (not (= (_ bv0 32) .cse1)))))) is different from false [2021-11-23 17:44:42,684 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_903 (_ BitVec 32)) (v_ArrVal_901 (_ BitVec 32)) (v_ArrVal_900 (_ BitVec 32)) (v_ArrVal_898 (_ BitVec 32)) (v_ArrVal_895 (_ BitVec 32)) (v_ArrVal_893 (_ BitVec 32)) (|v_ULTIMATE.start_main_~i~0#1_540| (_ BitVec 32))) (let ((.cse1 (let ((.cse2 (bvmul |c_ULTIMATE.start_main_~i~0#1| (_ bv8 32)))) (store (store (store (store (store (store (select |c_#memory_int| |c_ULTIMATE.start_main_~#volArray~0#1.base|) (bvadd (_ bv4294967292 32) |c_ULTIMATE.start_main_~#volArray~0#1.offset| .cse2) v_ArrVal_893) (bvadd |c_ULTIMATE.start_main_~#volArray~0#1.offset| (_ bv4294967288 32) .cse2) v_ArrVal_895) (bvadd (_ bv4 32) |c_ULTIMATE.start_main_~#volArray~0#1.offset| .cse2) v_ArrVal_898) (bvadd |c_ULTIMATE.start_main_~#volArray~0#1.offset| .cse2) v_ArrVal_900) (bvadd |c_ULTIMATE.start_main_~#volArray~0#1.offset| .cse2 (_ bv12 32)) v_ArrVal_901) (bvadd (_ bv8 32) |c_ULTIMATE.start_main_~#volArray~0#1.offset| .cse2) v_ArrVal_903)))) (let ((.cse0 (select .cse1 (bvadd (bvmul |v_ULTIMATE.start_main_~i~0#1_540| (_ bv4 32)) |c_ULTIMATE.start_main_~#volArray~0#1.offset|)))) (or (not (= .cse0 (_ bv0 32))) (bvsle (select .cse1 (bvadd (_ bv4 32) |c_ULTIMATE.start_main_~#volArray~0#1.offset|)) .cse0))))) is different from false [2021-11-23 17:44:44,809 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_903 (_ BitVec 32)) (v_ArrVal_901 (_ BitVec 32)) (v_ArrVal_900 (_ BitVec 32)) (v_ArrVal_898 (_ BitVec 32)) (v_ArrVal_895 (_ BitVec 32)) (v_ArrVal_893 (_ BitVec 32)) (|v_ULTIMATE.start_main_~i~0#1_540| (_ BitVec 32))) (let ((.cse0 (let ((.cse2 (bvmul |c_ULTIMATE.start_main_~i~0#1| (_ bv8 32)))) (store (store (store (store (store (store (select |c_#memory_int| |c_ULTIMATE.start_main_~#volArray~0#1.base|) (bvadd (_ bv4 32) |c_ULTIMATE.start_main_~#volArray~0#1.offset| .cse2) v_ArrVal_893) (bvadd |c_ULTIMATE.start_main_~#volArray~0#1.offset| .cse2) v_ArrVal_895) (bvadd |c_ULTIMATE.start_main_~#volArray~0#1.offset| .cse2 (_ bv12 32)) v_ArrVal_898) (bvadd (_ bv8 32) |c_ULTIMATE.start_main_~#volArray~0#1.offset| .cse2) v_ArrVal_900) (bvadd |c_ULTIMATE.start_main_~#volArray~0#1.offset| (_ bv20 32) .cse2) v_ArrVal_901) (bvadd (_ bv16 32) |c_ULTIMATE.start_main_~#volArray~0#1.offset| .cse2) v_ArrVal_903)))) (let ((.cse1 (select .cse0 (bvadd (bvmul |v_ULTIMATE.start_main_~i~0#1_540| (_ bv4 32)) |c_ULTIMATE.start_main_~#volArray~0#1.offset|)))) (or (bvsle (select .cse0 (bvadd (_ bv4 32) |c_ULTIMATE.start_main_~#volArray~0#1.offset|)) .cse1) (not (= .cse1 (_ bv0 32))))))) is different from false [2021-11-23 17:44:46,873 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_903 (_ BitVec 32)) (v_ArrVal_901 (_ BitVec 32)) (v_ArrVal_900 (_ BitVec 32)) (v_ArrVal_898 (_ BitVec 32)) (v_ArrVal_895 (_ BitVec 32)) (v_ArrVal_893 (_ BitVec 32)) (v_ArrVal_891 (_ BitVec 32)) (|v_ULTIMATE.start_main_~i~0#1_540| (_ BitVec 32))) (let ((.cse1 (let ((.cse2 (bvmul |c_ULTIMATE.start_main_~i~0#1| (_ bv8 32)))) (store (store (store (store (store (store (store (select |c_#memory_int| |c_ULTIMATE.start_main_~#volArray~0#1.base|) (bvadd |c_ULTIMATE.start_main_~#volArray~0#1.offset| (_ bv4294967288 32) .cse2) v_ArrVal_891) (bvadd (_ bv4 32) |c_ULTIMATE.start_main_~#volArray~0#1.offset| .cse2) v_ArrVal_893) (bvadd |c_ULTIMATE.start_main_~#volArray~0#1.offset| .cse2) v_ArrVal_895) (bvadd |c_ULTIMATE.start_main_~#volArray~0#1.offset| .cse2 (_ bv12 32)) v_ArrVal_898) (bvadd (_ bv8 32) |c_ULTIMATE.start_main_~#volArray~0#1.offset| .cse2) v_ArrVal_900) (bvadd |c_ULTIMATE.start_main_~#volArray~0#1.offset| (_ bv20 32) .cse2) v_ArrVal_901) (bvadd (_ bv16 32) |c_ULTIMATE.start_main_~#volArray~0#1.offset| .cse2) v_ArrVal_903)))) (let ((.cse0 (select .cse1 (bvadd (bvmul |v_ULTIMATE.start_main_~i~0#1_540| (_ bv4 32)) |c_ULTIMATE.start_main_~#volArray~0#1.offset|)))) (or (not (= .cse0 (_ bv0 32))) (bvsle (select .cse1 (bvadd (_ bv4 32) |c_ULTIMATE.start_main_~#volArray~0#1.offset|)) .cse0))))) is different from false [2021-11-23 17:44:46,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 219 treesize of output 213 [2021-11-23 17:44:50,722 INFO L354 Elim1Store]: treesize reduction 9, result has 35.7 percent of original size [2021-11-23 17:44:50,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 742339077156702 treesize of output 741481157341027